JP2025010054A - POWER SYSTEM CHANGE SUPPORT DEVICE, POWER SYSTEM CHANGE SUPPORT SYSTEM, AND POWER SYSTEM CHANGE SUPPORT METHOD - Google Patents

Abstract

To provide a power system switching support device, a power system switching support system, and a power system switching support method, which support a switching operation of a power system construction.SOLUTION: A power system switching support device for supporting of determining and an operating of switching of a power system in the case where a power facility stop plan for stopping a power facility is performed, includes: storage means 13 of storing, as switching patterns, a plurality of construction patterns of a power system which can be switched; calculation means 12 of calculating transmission loss in a power circulation facility constructing the power system, a finish margin restriction amount of which an output of an adjustment power supply are suppressed and/or a renewable energy power supply control amount in which an output of a renewable energy power supply is suppressed in each switching pattern; and switching support means 12 of outputting, as supporting information, information which indicates a plurality of switching patterns, and in which the plurality of switching patterns is realigned on the basis of the power transmission loss, the finish margin restriction amount, and/or the renewable energy power supply control amount calculated by the calculation means 12.SELECTED DRAWING: Figure 2

Description

The present invention relates to a power system switching support device, a power system switching support system, and a power system switching method for supporting switching of power system configurations.

When power distribution facilities such as transmission lines and transformers that make up a power system are shut down for maintenance or other purposes, system operation is performed to switch the configuration of the power system in order to change the power flow, which is the flow of electricity, by judging efficiency aspects such as the operational capacity and transmission loss of the transformers and transmission lines, power quality assuming the unlikely event of a secondary accident, phase angle stability, voltage stability, etc. Such switching of the power system configuration is performed by system operators such as general electricity transmission and distribution companies by controlling the on/off of circuit breakers in order to make maximum use of the existing power system, but such judgments and decision-making have traditionally been based on experience, predicting possible events and using various simulations, etc., which has led to the problem of a high workload for system operation decision-making and daily system operation.
In particular, in recent years, while renewable energy sources such as solar power generation (hereinafter also referred to as renewable energy sources) are increasing, there are also areas where the demand for electricity is decreasing due to a decrease in population, and electricity does not necessarily flow in one direction from power plants to homes. Instead, there is an increasing number of cases where electricity flows from the demand side such as homes toward the power grid as an upstream current, which is called reverse current, and switching between power grids requires advanced and complex situational awareness and judgment. Such upstream currents from demand areas affect regulating power sources such as thermal power plants and hydroelectric power plants connected to the power grid, and there are concerns about restrictions on the up-charge that will prevent maximum power generation. It is predicted that the power grid will become increasingly congested in the future due to the increase in renewable energy sources. Therefore, optimizing the system switching pattern in response to the congestion situation of the power grid is an important issue that must be addressed in the future in order to efficiently operate the power grid, reduce the opportunities for having to suppress renewable energy sources, and contribute to a decarbonized society.

In response to these problems, Patent Document 1 discloses a system switching management device that manages system patterns that list basic systems and switching destinations in chronological order, called a system switching demarcation table, without performing power flow calculations, confirms that system separation will not occur, performs power flow calculations for system configurations that have been confirmed not to cause system separation, and selects a system configuration whose power flow calculation results satisfy the power flow constraint conditions.

JP 2015-50875 A

However, while Patent Document 1 is a rational method for creating system patterns using a system switching line table, in an era in which the direction of power flow is changing due to the expansion of renewable energy introduction, when there are multiple system configurations that satisfy power flow constraint conditions, it is necessary to determine which system configuration is preferable, and it cannot be said that it provides sufficient support for the task of switching power system configurations.

The present invention aims to provide a power system switching support device, a power system switching support system, and a power system switching method that can more appropriately support the switching of power system configurations.

The power system switching support device of the present invention is a power system switching support device for supporting the determination of constant open points when the power system is grouped by region rather than operating the entire power system in a loop due to constraints such as short circuit capacity during normal operation, and for supporting the switching operation of the power system to be performed in combination when some power equipment is stopped, and has a switching pattern storage means for storing a plurality of switchable power system configuration patterns as switching patterns for each power equipment grouped by region, a calculation means for calculating, for each switching pattern according to the plurality of switching patterns corresponding to the target power equipment, a transmission loss, a step-up constraint amount that will suppress the output of the regulating power source, and/or a renewable energy power source control amount that will suppress the output of the renewable energy power source, and a switching support means for outputting, as support information, information indicating the plurality of switching patterns, where the plurality of switching patterns are rearranged based on the transmission loss, step-up constraint amount, and/or renewable energy power source control amount calculated by the calculation means.
The above power system switching support device may further include an equipment information acquisition means for acquiring information on target power equipment that is scheduled to be shut down in a power equipment shutdown plan, and the switching support means may be configured to output, as the support information, information in which a plurality of switching patterns corresponding to the target power equipment are rearranged based on transmission loss, up-consumption constraint amount, and/or renewable energy power source control amount when the target power equipment is shut down in the power equipment shutdown plan.
In the above-mentioned power system switching support device, the calculation means can be configured to further calculate a degree of system congestion with respect to an operational capacity of a power distribution facility for each switching pattern when the target power facility is stopped, and the switching support means can be configured to display the degree of system congestion in the support information.
The power system switching support device further includes a power flow calculation means for calculating a power flow calculated from the voltage, current, and phase of a power plant, a substation, a demand site, etc. in the power system, and the power flow calculation means compares the power flow when the power system is switched to the configuration of the switching pattern when the target power facility is stopped with the power flow when the power system is not switched, calculates the sum of the absolute values of the transmission losses occurring in the transmission lines of the power system in the range including the power facilities constituting the target area for each switching pattern, and the switching support means can be configured to output information obtained by rearranging the switching patterns in which the sum of the absolute values is equal to or greater than a predetermined value in order of the transmission losses in ascending order as the support information. Furthermore, in the switching pattern, when renewable energy sources are suppressed, the switching patterns can be rearranged in order of the amount of suppression that is smallest, and output as the support information. Similarly, in the case where the step-up fee of an adjustment power source is suppressed, the switching patterns can be rearranged in order of the amount of suppression that is smallest, and output as the support information. In addition, a plurality of rearrangement conditions can be combined to output as the support information. The switching patterns include an option of not switching the system and not changing the constantly open points in the immediately preceding system configuration, and are provided as support information.
In the above power system switching support device, the transmission loss calculation means can be configured to decompose a power supply area into a plurality of meshes, determine power generation and demand by taking into account meteorological information for each mesh, the amount of power generation by renewable energy power sources, and past performance statistics of power consumption, and calculate the transmission loss by a power flow calculation method.
In the above-mentioned power system switching support device, the transmission loss calculation means can be configured to calculate, for each switching pattern, the transmission losses at a plurality of times within a downtime during which the target power equipment is stopped, and the switching support means can be configured, when the switching pattern is selected, to output the support information including information on the transmission losses at the plurality of times within the downtime for the switching pattern.
In the above power system switching support device, the transmission loss calculation means can also calculate, for each switching pattern, the transmission loss in a stop operation time for stopping the target power equipment and a restoration operation time for restoring the target power equipment, and when the switching pattern is selected, the switching support means can be configured to output, in the support information, information on the transmission loss occurring during this system operation time as the stop operation time and the restoration operation time as the time required for the system switching operation.
In the above-mentioned system switching support device, the renewable energy power source control amount calculation means can be configured to perform a voltage flow calculation for each switching pattern, and when the target power equipment exceeds its operating capacity, suppress various power sources in accordance with predetermined suppression rules until the excess is eliminated, calculate a renewable energy power source control amount, and output it as part of the support information.
In the above-mentioned system switching support device, the adjustment power source boost calculation means can be configured to assume, for each switching pattern, the case where the adjustment power source generates maximum power, calculate the amount of suppression of the adjustment power source when the operating capacity is exceeded, and set the amount of power generation at maximum power that will affect adjustment power sources such as thermal power plants and hydroelectric power plants connected to the power system, and output the amount as part of the support information by using the amount as a constraint on the boost.
The above-mentioned system switching support device may further include a configuration change means for adding new components of the power system or deleting existing components, and the calculation means may be configured to calculate a transmission loss, an upside constraint amount, and a renewable energy power source control amount in the configuration of the power system changed by the configuration change means.

The power system switching support system of the present invention is a power system switching support system for supporting power system switching work, and includes a database that stores, as switching patterns, multiple configuration patterns of the power system to be switched when power equipment is stopped, and a calculation device. The calculation device includes equipment information acquisition means for acquiring information of target power equipment that is power equipment scheduled to be shut down in a power equipment shutdown plan, calculation means for calculating, for each switching pattern of the target power equipment, a transmission loss in power distribution equipment that constitutes the power system, an up-front constraint amount that will suppress the output of an regulating power source, and/or a renewable energy power source control amount that will suppress the output of a renewable energy power source when the switching pattern is set, and switching support means for outputting, as support information, information indicating multiple switching patterns corresponding to the target power equipment, the multiple switching patterns being rearranged based on the transmission loss, up-front constraint amount, and/or renewable energy power source control amount calculated by the calculation means.
The power system switching method of the present invention is a power system switching method for performing power system switching work, which stores a plurality of configuration patterns of the power system to be switched when the power equipment is shut down as switching patterns, obtains information on target power equipment that is power equipment scheduled to be shut down in a power equipment shutdown plan, calculates, for each switching pattern of the target power equipment, a transmission loss in the power distribution equipment that constitutes the power system, a step-up constraint amount that will suppress the output of the regulating power source, and/or a renewable energy power source control amount that will suppress the output of the renewable energy power source when the switching pattern is set, and sorts information indicating a plurality of switching patterns corresponding to the target power equipment based on the transmission loss, step-up constraint amount, and/or renewable energy power source control amount calculated for the plurality of switching patterns.

According to the present invention, among the switching patterns of the power system configuration corresponding to the entire power system or the power facilities within the jurisdiction or a grouped range, support information is output that prioritizes switching patterns that reduce the amount of suppression of renewable energy sources connected to the system, or that impose as few restrictions as possible on the operation of power plants contracted as regulating sources, and that have small transmission losses. This makes it possible to select a pattern while taking into account various conditions from the perspective of power system operation, while also taking into account the reliability of the power supply, and therefore supports consideration of switching of the power system configuration and power system operation.

FIG. 1 is a diagram for explaining switching of a power system. 1 is a configuration diagram of a power system transfer support device according to an embodiment of the present invention. FIG. 13 is a diagram showing a configuration of a switching pattern table. 4 is an example of a power system switching management screen according to the embodiment. 13 is a screen example of a switching management details screen according to the embodiment. FIG. 13 is a diagram showing an example of a screen that displays renewable energy power supply control information as support information. 1 is a flowchart (part 1) showing a power system switching support process according to the present embodiment. 11 is a flowchart (part 2) showing the power system switching support process according to the embodiment; FIG. 2 is a diagram illustrating a configuration of a power system in a switching pattern 1 according to the first embodiment. FIG. 2 is a diagram illustrating a configuration of a power system in a switching pattern 2 according to the first embodiment. FIG. 2 is a diagram illustrating a configuration of a power system in a switching pattern 3 according to the first embodiment. FIG. 2 is a diagram illustrating a configuration of a power system in a switching pattern 4 according to the first embodiment. 13 is a table showing simulation results of the increase margin constraint amount, the renewable energy power source suppression amount, and the transmission loss in the configuration of the power system for each switching pattern according to the first embodiment. 11 is a graph showing the transition of the increase margin constraint amount, the renewable energy power source suppression amount, and the transmission loss in the configuration of the power system for each switching pattern according to the first embodiment. 11 is a graph showing a transition of a continuously variable power flow in a power system configuration of each switching pattern according to the first embodiment. FIG. 11 is a diagram illustrating a configuration of a power system in a switching pattern 1 according to a second embodiment. FIG. 11 is a diagram illustrating a configuration of a power system in a switching pattern 2 according to a second embodiment. FIG. 11 is a diagram illustrating a configuration of a power system in a switching pattern 3 according to a second embodiment. FIG. 11 is a diagram illustrating a configuration of a power system in a switching pattern 4 according to a second embodiment. 13 is a table showing simulation results of the increase margin constraint amount, the renewable energy power source suppression amount, and the transmission loss in the configuration of the power system for each switching pattern according to Example 2. 13 is a graph showing the transition of the increase margin constraint amount, the renewable energy power source suppression amount, and the transmission loss in the configuration of the power system for each switching pattern according to the second embodiment. 13 is a graph showing the transition of the continuous variation power flow in the configuration of the power system for each switching pattern according to the second embodiment.

Below, an embodiment of the present invention will be described with reference to the drawings. In the following, a synchronous generator such as a nuclear power plant, a thermal power plant, or a hydroelectric power plant will be simply referred to as a "generator", and a power generation facility connected to a power grid via an inverter such as a solar power plant or a wind power plant will be collectively referred to as a "renewable energy power source" or "renewable energy power source". Furthermore, a generator, a renewable energy power source, an electric power plant, and a load connected to a power grid will be collectively referred to simply as "components".

The present invention relates to a power system switching support device that supports the switching of power systems within a power supply area. The power system switching support device according to this embodiment is a device that is operated by a system operator, such as a general power transmission and distribution company, to present support information for switching of power systems to the system operator and support the system operator when switching the power system. In the following, the person who operates the power system switching support device and manages and operates the power system configuration will be referred to as the "system operator". The above "system operator" is not limited to a person belonging to a general power transmission and distribution company, and for example, a person belonging to a retail electricity business may operate the power system switching support device as the above "system operator" according to the facility jurisdiction, regardless of the system scale, such as a microgrid or a regional network. The above "power supply area" may be the entire area to which the general power transmission and distribution company supplies power, or it may be one of the areas obtained by dividing the entire area into multiple areas. In this embodiment, the system will assist in switching the configuration of the power grid in the "power supply area," and will support the system operator by integrating or extracting power-related specifications within the range of power facilities grouped by pre-defined region as the range that encompasses the opening points of the "power supply area," creating support information, and presenting it to the system operator.

The following describes an example of a configuration that supports the task of switching the configuration of a power system when a system operator stops power distribution equipment such as transmission lines and transformers that make up the power system for maintenance or other purposes. However, the power system switching support device of the present invention can also be applied in situations where the configuration of the power system is switched to a more suitable configuration (in situations where the configuration of the power system is optimized), such as changing the constant open point without stopping the power equipment.

First Embodiment
Fig. 1 is a diagram for explaining the switching of the power system in the power supply area, Fig. 1(A) is a diagram showing the configuration before the switching of the power system, and Fig. 1(B) is a diagram showing the configuration after the switching of the power system. In Fig. 1, G indicates a generator, B indicates a load and indicates a demand area where power generation by renewable energy sources may exceed that of the power system, and the solid lines indicate transmission lines and transformers. The dashed lines indicate a state in which switching is possible but is cut off.

For example, in the example shown in FIG. 1(A), it is assumed that there is a plan to shut down the power line L3 in the power supply area A for maintenance. Before shutting down the power line L3, the circuit breaker that cuts off the current to the power line L4 shown by the dashed line is turned off, and the current to the power line L4 is cut off. Therefore, before shutting down the power line L3, the power is transmitted from the generator G to the load B1 via the power lines L2 and L3. On the other hand, when shutting down the power line L3, power cannot be transmitted via the power line L3, so the circuit breaker that cuts off the current to the power line L4 is turned on, and the power is transmitted from the generator G to the load B1 via the power lines L1 and L4.

Such power system switching work is performed by the system operator using the power system switching support device 10 according to this embodiment to control the on/off of circuit breakers connected to power distribution facilities such as transmission lines and transformers. In this embodiment, the power system switching operation is performed based on a power equipment shutdown plan. When power distribution facilities such as transmission lines and transformers constituting the power system are stopped for maintenance or other purposes, the power equipment shutdown plan determines the efficiency aspects such as the operational capacity and transmission loss of the transformer and transmission line, the power quality assuming a consecutive accident, the phase angle stability, the voltage stability, etc., of the transformer and transmission line, and performs a system operation operation to switch the configuration of the power system in order to change the power flow, which is the flow of power. In addition, in the inspection and operation shutdown of the generator, the system operation operation to switch the configuration of the power system is similarly managed. Such switching of the power system configuration is performed by the system operator by controlling the on/off of the circuit breaker. In addition, in normal operation, instead of operating the entire power system in a loop due to constraints such as short circuit capacity, support is provided for determining the permanently open points when grouping by region, or the configuration of part of the power system may be changed in anticipation of changes in meteorological conditions such as lightning or the unlikely event of a system accident. Such planned operations are planned in advance by the system operator, and the information is input to the power system switching support device 10.

Here, when looking at the entire power system, if the power system configuration is changed or if some power equipment is disconnected from the power system configuration, the power flow changes, so it is important to appropriately change the power system configuration based on a power equipment outage plan in order to ensure a stable power flow and efficient power transmission. In particular, with the introduction of non-farm type connections and the increase in renewable energy sources, the power flow changes significantly from hour to hour and may exceed the operating capacity of the power equipment, so it is necessary to manage and operate the power system configuration while taking time (time of day) into consideration. The power system switching support device 10 according to this embodiment is a device for supporting such power system switching by the system operator, and has the following configuration.

Figure 2 is a configuration diagram of the power system transfer support device 10 according to this embodiment. As shown in Figure 2, the power system transfer support device 10 according to this embodiment has a communication device 11, a calculation device 12, a storage device 13, a database 14, a display device 15, a notification device 16, and an input device 17.

The calculation device 12 has a stop plan acquisition function for acquiring a stop plan for the power equipment by executing a program stored in the storage device 13, a switching pattern extraction function for extracting information on the switching pattern of the power system configuration, a power flow calculation function for calculating the power flow of the power system, a transmission loss calculation function for calculating the transmission loss of the power system, a renewable energy power source control amount calculation function for calculating the renewable energy power source control amount in the system, a boost constraint amount calculation function for calculating the boost constraint amount that constrains the boost margin of the regulating power source, and a switching support function for generating and outputting support information for supporting the switching of the power system based on the calculated transmission loss, renewable energy power source control amount, and boost constraint amount. This support can optimize the system switching pattern and reduce the opportunities to suppress renewable energy power sources. Below, each function of the calculation device 12 is described. In this embodiment, for ease of explanation, the calculation function of the calculation device 12 is described as an individual function for each piece of data to be calculated (power flow, power transmission loss, renewable energy source control amount, up-front constraint amount, etc.), but these functions can be collectively referred to as the calculation function.

The shutdown plan acquisition function of the computing device 12 acquires shutdown information of the power equipment (hereinafter referred to as the target power equipment) that causes the switching of the power system as power equipment shutdown plan information. Here, the series of operations to shut down the target power equipment includes a shutdown operation for shutting down the target power equipment and a restoration operation for restoring the stopped target power equipment. Therefore, the power shutdown plan information according to this embodiment includes information on the section where the target power equipment is shut down (the disconnection point of the target power equipment), as well as time information on the start time of the shutdown operation, the implementation time of the shutdown operation, the time for shutting down the target power equipment, the start time of the restoration operation, and the end time of the restoration operation, and information on the related equipment shutdown section (disconnection point).

In this embodiment, power equipment shutdown plan information for one or more power equipment is registered in the database 14 or an external device, and the shutdown plan acquisition function acquires one or more pieces of power equipment shutdown plan information by referring to the database 14 or the external device. In addition, when the grid operator operates the input device 17 to select target power equipment shutdown plan information from multiple pieces of power equipment shutdown plan information, the selected power equipment shutdown plan information can be acquired. Note that, when the power equipment shutdown plan information is stored in an external device, the shutdown plan acquisition function can acquire the power equipment shutdown plan information for the target power equipment by communicating with the external device.

The pattern extraction function of the computing device 12 extracts, as switching pattern information, information on a switching pattern for switching the configuration of the power system when the target power equipment of the power equipment shutdown plan information is shut down based on the power equipment shutdown plan information acquired by the shutdown plan acquisition function from the database 14. Here, FIG. 3 is a diagram showing an example of a switching pattern table stored in the database 14. As shown in FIG. 3, the switching pattern table of the database 14 stores, as switching pattern information, information on the target power equipment, the name (or identification code) of the switching pattern of the power system, and information on the switching location in association with each other. Note that the information on the switching location includes information on the breaker that will cut off the current as the opening point, and information on the breaker that will allow the current to flow as the connection point. Note that, as shown in FIG. 3, the target power equipment, the switching pattern of the power system, and the information on the switching location may be stored in one table, or a table in which the target power equipment and the identification code of the switching pattern are associated with each other, and a table in which the identification code of the switching pattern and the information on the switching location are associated with each other may be stored. The pattern extraction function can thus extract one or more pieces of switching pattern information corresponding to the target power equipment from among the multiple pieces of switching pattern information stored in the switching pattern table of the database 14. For example, in the example shown in FIG. 3, when the power transmission line A system is selected as the target power equipment, the pattern extraction function can be configured to extract switching pattern information (information including the name (or identification information) of the switching pattern, the connection point, and the opening point) of patterns A1 to A4 corresponding to the power transmission line A system.

The power flow calculation function of the arithmetic device 12 calculates the power flow of the power system. Specifically, the power flow calculation function calculates the power flow when the target power equipment is stopped with the current power system configuration. Furthermore, the power flow calculation function calculates the power flow when the target power equipment is stopped and the power system is changed to a configuration corresponding to the switching pattern extracted by the pattern extraction function. Note that the power flow calculation function is not limited to the power equipment stop plan, and can also be configured to calculate the power flow when the power system configuration is changed to a configuration corresponding to the system switching pattern extracted by the pattern extraction function without stopping the power equipment, such as changing the constant opening point. In addition, a well-known method can be used for the calculation of the power flow, and the power flow can be calculated using known parameters of each component that constitutes the power system. In addition, when calculating the power flow of the configuration corresponding to the switching pattern extracted by the pattern extraction function, the power flow is calculated when the breaker of the power system is set to the connection point and opening point included in the information on the switching pattern.

In addition, in this embodiment, the power flow calculation function calculates the power flow at multiple times during the outage time of the target power equipment. For example, the power flow calculation function can be configured to calculate the power flow, for example, in 30-minute increments, during the outage time of the target power equipment. The calculation time interval can be any interval, such as every 15 minutes or every 5 minutes. The power flow calculation function can be configured to calculate the power flow not only during the outage time of the target power equipment (the time during which the target power equipment is actually out of service), but also during the shutdown operation time for shutting down the target power equipment or the restoration operation time for restoring the target power equipment. In this case, the power flow calculation function can be configured to calculate the power flow at multiple times (for example, in 30-minute increments) for the shutdown operation time and restoration operation time as well.

In addition, the power flow calculation function can be configured to calculate the power flow for each substation by referring to meteorological information such as weather and temperature in each mesh obtained by dividing the power supply area into meshes with an area of 1 to 5 ^km2, and statistical information on the past performance of the power consumption for each substation, and to calculate the power flow for the entire power supply area based on the power flow calculated for each substation. Specifically, the power system switching support device 10 is connected to an external database, and acquires meteorological information for each mesh (for example, weather, climate, and seasonal information) and the past performance of the power consumption for each substation from the external database. In addition, the power flow calculation function calculates the power generation amount of each renewable energy power source based on the meteorological information in the mesh in which each renewable energy power source is located and the installed capacity of each renewable energy power source, and further calculates the total value of the power generation amount of one or more renewable energy power sources under the jurisdiction of each substation as the power generation amount of the substation. Furthermore, the power flow calculation function predicts the power consumption of each substation based on statistical information on the past performance of the power consumption value of the substation, and calculates the power supply and demand of each substation by adding it to the power generation of the renewable energy power source of the substation. The power flow calculation function can obtain the power flow of the power system by allocating the power supply and demand at each substation to each substation while taking into consideration the connection status of the power transmission line (such as the transmission and distribution route connected to each substation). For example, the amount of power generated by solar power generation differs when the weather is sunny and when it is rainy, and the amount of power consumed by each household is higher in summer and winter due to the use of air conditioners, etc., compared to spring and autumn. Therefore, it is preferable to configure the power flow to be calculated based on meteorological information and statistical information on the past performance. Note that in homes and facilities where solar panels, which are renewable energy sources, are installed, the power generated by the solar panels may be locally produced and consumed for self-consumption. The power flow calculation function can also be configured to predict such self-consumption based on past records and calculate the power flow of each substation.

Furthermore, the power flow calculation function can be configured to calculate the power flow by taking into account the trend of changes in the power flow based on statistical information on the past performance of the power generation or power consumption of each power plant. For example, the power flow calculation function can be configured to obtain the trends in the power generation or power consumption at each substation over a certain period (for example, several years to a dozen years) from statistical information on past performance, and if it is found that power consumption is decreasing at a certain rate and power generation is increasing at a certain rate in mountainous areas where depopulation is progressing and the population is decreasing while the installation of renewable energy sources is increasing, the power flow calculation function can be configured to reduce the power consumption in the estimated area by the above rate and increase the power generation by the above rate as a prediction correction.

In this way, the power flow calculation function of this embodiment predicts the amount of power generated and consumed by renewable energy sources on a substation basis, and calculates the power flow when the target power equipment is stopped while maintaining the current power system configuration, and the power flow when the target power equipment is stopped and the power system is changed to a configuration corresponding to the switching pattern extracted by the pattern extraction function, for multiple times including the stop time, the stop operation time, and the restoration operation time of the target power equipment.

Next, the transmission loss calculation function of the arithmetic unit 12 will be described. The transmission loss calculation function calculates the transmission loss before changing the configuration of the power system, and the transmission loss in the configuration of the power system changed according to the switching pattern extracted by the pattern extraction function. Specifically, the transmission loss calculation function calculates the transmission loss when each breaker of the power system is set at the current connection point and opening point, and the transmission loss when set at the connection point and opening point included in the information of the switching pattern. The method of calculating the transmission loss is not particularly limited, and the transmission loss can be calculated by a well-known method based on known parameters such as the electrical resistance of the transmission line and the length of the transmission path. The transmission loss calculation function can calculate the transmission loss in any range by calculating the transmission loss for each transmission line and accumulating the transmission loss calculated for each transmission. The range of the power system in which the transmission losses calculated for each transmission line are totaled, tabulated, and compared can also be set arbitrarily.

In addition, in this embodiment, the transmission loss calculation function calculates the transmission loss before changing the configuration of the power system, and the transmission loss when switching to the switching pattern configuration. Furthermore, like the power flow calculation function, the transmission loss calculation function calculates the transmission loss for multiple times of the stoppage time, the stop operation time, and the restoration operation time of the target power equipment.

The calculation function of the calculation device 12 calculates the renewable energy power source control amount related to the control of the renewable energy power source in the power supply area. Here, in power distribution facilities such as transformers and power transmission lines, the operational transmission capacity (operational capacity) is determined, and when a switching pattern is set to switch the configuration of the power system and a power source generates power as planned, the operational capacity of the power distribution facilities may be exceeded. In such a case, the operational capacity of the power distribution facilities is suppressed to a range that does not exceed the operational capacity of the power distribution facilities for each power source type and contract type in accordance with predetermined suppression rules (suppression order). The renewable energy power source control amount calculation function calculates the operating capacity of the power distribution equipment when switched to the switching pattern configuration based on the existing parameters of each configuration of the power system when switched to the switching pattern configuration, thereby calculating the renewable energy power source control amount (pre-suppression predicted power generation value of the renewable energy power source connected to the system under the power distribution equipment - predicted post-suppression value of the renewable energy power source connected to the system under the power distribution equipment when power generation suppression is performed in accordance with the suppression rule to the extent that does not exceed the operating capacity of the power distribution equipment) when the power system is switched to the target switching pattern configuration. In addition, the renewable energy power source control amount calculation function can also be configured to calculate the renewable energy power source control amount for multiple times of the stop time, stop operation time, and recovery operation time of the target power equipment.

The boost constraint calculation function of the computing device 12 calculates the amount by which the output of the regulated power source is restricted when the power system is switched to the configuration of the switching pattern as the boost constraint amount. Here, when the switching pattern is set to switch the configuration of the power system and the output of the regulated power source is increased to the rated output, the operation capacity of the power distribution facility may be exceeded. Therefore, in such a case, a constraint is set on the output of the regulated power source so that the output of the regulated power source does not increase to the rated output. The boost constraint calculation function calculates the amount by which the output of the regulated power source is restricted when the power system is switched to the configuration of the target switching pattern (the rated output of the regulated power source - the output upper limit value of the regulated power source after the configuration of the power system is switched) as the boost constraint amount by calculating the operation capacity of the power distribution facility when the power system is switched to the configuration of the switching pattern based on the existing parameters of each configuration of the power system when switched to the configuration of the switching pattern. In addition, the boost constraint calculation function can be configured to calculate the boost constraint amount for multiple times of the stop time, the stop operation time, and the recovery operation time of the target power facility.

Next, the switching support function of the calculation device 12 will be described. The switching support function creates support information that the system operator can refer to when switching the configuration of the power system based on the transmission loss calculated by the transmission loss calculation function, the renewable energy power source control amount calculated by the renewable energy power source control amount calculation function, and the increase margin constraint amount calculated by the increase margin constraint amount calculation function, and presents this information to the system operator, thereby supporting the system operator in switching the power system.

Specifically, the switching support function creates support information that prioritizes switching patterns with smaller transmission losses after switching among multiple switching patterns corresponding to the target power equipment, and displays the support information on the display device 15, thereby presenting the support information to the system operator. In addition, as shown in FIG. 4, the switching support function can display, in a list box (or pull-down) on the management screen, for example, a list of multiple switching patterns corresponding to the target power equipment as support information with priority given to switching patterns with smaller transmission losses, sorting the switching patterns so that the patterns with smaller transmission losses are displayed at the top. This allows the system operator to understand that the configuration of the switching pattern at the top has smaller transmission losses, and can use this as a reference for switching the power system. Note that FIG. 4 is an example of a power system switching management screen according to this embodiment.

The switching support function can be configured to display, as support information, information on the switching patterns sorted based on the renewable energy power control amount calculated by the renewable energy power control amount calculation function and/or the boost margin constraint amount calculated by the boost margin constraint amount calculation function. For example, when the grid operator operates the input device 17 to set the "renewable energy power control amount" to 1, the "boost margin constraint amount" to 2, and the "transmission loss" to 3 in the "sort switching" list box on the screen shown in FIG. 4 and makes a display request, the switching support function can first sort the switching patterns in order of decreasing renewable energy power control amount, and then, if there are multiple switching patterns with the same renewable energy power control amount (such as multiple 0 values), sort the switching patterns in order of decreasing boost margin constraint amount among the switching patterns with the same renewable energy power control amount, and if there are multiple switching patterns with the same boost margin constraint amount, sort the switching patterns in order of decreasing transmission loss among the switching patterns with the same boost margin constraint amount.

The switching support function can also be configured to display, as support information, the name of the switching pattern, as well as the transmission loss, renewable energy power control amount, and increase margin constraint amount when the power system is switched to the switching pattern configuration, in numerical form, as shown in Figure 4. Furthermore, the switching support function can also be configured to use the transmission loss, renewable energy power control amount, and increase margin constraint amount of an arbitrarily specified switching pattern as a reference, calculate the difference (increase or decrease) in the transmission loss, renewable energy power control amount, and increase margin constraint amount when the power system is switched to the switching pattern configuration, relative to the reference transmission loss, renewable energy power control amount, and increase margin constraint amount, and display, as support information, information in which the switching patterns are sorted in ascending order of the difference in transmission loss, renewable energy power control amount, and increase margin constraint amount. In this embodiment, as shown in FIG. 4, the power system switching management screen can be switched between "quantity display" and "difference display." When "quantity display" is displayed, the transmission loss, renewable energy power source control amount, and/or margin constraint amount when the power system is switched to the switching pattern configuration are displayed. When "difference display" is displayed, the difference (increase or decrease) between the transmission loss, renewable energy power source control amount, and margin constraint amount relative to a specified standard is displayed.

Furthermore, the switching support function can calculate the total values of the transmission loss, the renewable energy power source control amount, and/or the increase margin constraint amount for each switching pattern at multiple times during the outage time, the outage operation time, and the restoration operation time of the target power equipment, and display the information on the switching pattern sorted based on the total values as support information. The switching support function can also provide as support information a configuration in which no grid switching is performed and the constant open point in the previous grid configuration is not changed, by including it as a switching pattern option.

In addition, the switching support function can be configured to set by default the switching pattern with the smallest transmission loss, renewable energy power source control amount, or up-rate constraint amount among multiple switching patterns included in the support information. When the switching pattern is set by default, or when the system operator operates the input device 17 to set a switching pattern displayed in a list box or the like, the switching support function can be configured to display on the display device 15 the transmission loss, renewable energy power source control amount, and up-rate constraint amount calculated in the configuration of the set switching pattern, as shown in FIG. 5, at each time during the stop time, stop operation time, and restoration operation time of the target power equipment. In the example shown in FIG. 5, the transmission loss in each transmission line, the renewable energy power source control amount of each system, and the up-rate constraint amount of each regulating power source are displayed at regular time intervals (for example, 30 minutes) over the stop operation time, stop operation time, and restoration operation time in the selected switching pattern.

The switching support function can be configured to display the renewable energy power source control amount created by the renewable energy power source control amount calculation function in combination with the power system diagram as support information. For example, the switching support function can be configured to display information showing the power system diagram including the renewable energy power source on the screen when the system operator operates the input device 17 to select a switching pattern and displays the power switching management details screen shown in FIG. 5 or another screen. Furthermore, the switching support function can display the renewable energy power source control information of the renewable energy power source when an icon showing a renewable energy power source is clicked in the displayed power system diagram. The renewable energy power source control information can be configured to not only display the control amount of the renewable energy power source, but also to display an image showing the status of the renewable energy power source in a different color depending on the reason for controlling the renewable energy power source. As an example, the reason for controlling the renewable energy power source can be displayed in a different color, such as blue if the reason is supply and demand adjustment, yellow if the local system is congested, and red if the main system is congested. The switching support function can also be configured to use colors to indicate the reason for controlling renewable energy sources at each time point, with the horizontal axis representing time, as shown in Figure 6(A). For example, in the example shown in Figure 6(A), it is visually displayed that at the time shown in (a), renewable energy sources are controlled due to supply and demand adjustment, at the time shown in (b), renewable energy sources are controlled due to congestion in the local grid, and at the time shown in (c), renewable energy sources are controlled due to congestion in the main grid.

The switching support function can also be configured to display the suppression rate of output control of renewable energy power sources in a time series, as shown in FIG. 6(B). The switching support function can also be configured to display the degree of grid congestion (power flow/operation capacity), as shown in FIG. 6(C) and (D). For example, in the examples shown in FIG. 6(C) and (D), the degree of grid congestion is shown by an arrow along the time axis, and the arrow is thicker in FIG. 6(D) than in FIG. 6(C). This indicates that the degree of grid congestion is higher in FIG. 6(D) than in FIG. 6(C), and such a display allows the grid operator to visually grasp the degree of grid congestion. FIG. 6 is a diagram showing an example of a screen that displays renewable energy power source control information as support information.

Furthermore, the switching support function can be configured to display the degree of system congestion in the power system diagram so that the time when congestion occurs can be comprehensively visually recognized. For example, the switching support function can be configured to display the lines indicating the transmission lines in the power system diagram in a color corresponding to the degree of system congestion (power flow/operation capacity). Specifically, the switching support function can be configured to display the lines indicating the transmission lines in a caution color or warning color such as orange or red as the degree of system congestion increases. Furthermore, the switching support function can be configured to display the lines indicating the transmission lines in a specially highlighted manner when the transmission lines reach their operational capacity limit. Furthermore, the switching support function can be configured to display the degree of system congestion for each hour of the day so that the system operator can grasp the degree of system congestion at each hour of the day. For example, the switching support function can display information indicating the degree of system congestion so that the system operator can operate the input device 17 to perform an operation (flick operation) to turn the image showing the power system diagram on which the degree of system congestion for every 30 minutes or every 15 minutes is superimposed, or so that the degree of system congestion is shown on the power system diagram shown on the XY plane as a time axis in the Z-axis direction. In addition, the switching support function can be configured to display the congestion status from the power generation company to the equivalent infinite bus (the area around the point where a certain amount of generated power is consumed by demand and the direction of the current reverses) by changing the color of the lines indicating each section based on the most severe section.

Furthermore, in this embodiment, the switching support function can be configured to provide the renewable energy power source control amount and system congestion degree to the renewable energy power source operator. Specifically, in this embodiment, the switching support function provides a user-dedicated screen (my page screen) for the renewable energy power source operator (hereinafter also referred to as user) to view the renewable energy power source control amount and system congestion degree, and the renewable energy power source operator can access the user-dedicated screen (my page screen) by connecting to the power system switching support device 10 from the outside and logging in with an ID for each user. On the my page screen, as shown in FIG. 6, the user can visually grasp the renewable energy power source control amount and system congestion degree of the power system to which the user's power source is connected, as well as the schedule and control results of the user's power source. In addition, on the my page screen, the user can customize whether or not to require advance notification when the user's power source is controlled, and the contact email address to notify, etc. Note that the program related to the user-dedicated screen (my page screen) may be a browser type, or may be a local type installed on a local information terminal such as a personal computer.

The switching support function, in combination with the switching pattern with the lowest transmission loss among the multiple switching patterns included in the support information, or as an individual function, can grasp the congestion state of the power system based on the presence or absence of restrictions on the step-up allowance of regulating power sources based on the operating capacity for an arbitrarily set range or for the entire system under its jurisdiction, and reduce the opportunities for having to suppress renewable energy sources. Based on the calculated transmission loss, it can provide support information for supporting the switching of the power system, assuming maximum power generation from regulating power sources for each switching pattern, and calculates the amount of suppression of regulating power sources when the operating capacity is exceeded, and displays the amount of restriction on the step-up allowance, which affects regulating power sources such as thermal power plants and hydroelectric power plants connected to the power system, and can be used as a reference for switching the power system, reflecting the amount of restriction on the step-up allowance in the display order.

The switching support function also rearranges the switching patterns by comparing the transmission loss, the renewable energy source control amount, and the up-charge constraint amount within the same power system. For example, if the power supply area is the entire area where the system operator supplies power (such as the Shikoku region), the switching support function sums up the transmission loss, the renewable energy source control amount, and the up-charge constraint amount within the entire area where the system operator supplies power for each switching pattern, and rearranges the switching patterns based on the total value. If the power supply area is a part of the area where the system operator supplies power, the switching support function sums up the transmission loss, the renewable energy source control amount, and the up-charge constraint amount within the part of the area where the system operator supplies power for each switching pattern, and rearranges the switching patterns based on the total value. Note that the range of the power supply area may change depending on the switching pattern. For example, in switching pattern P1, the configuration within the power supply area is assumed to be generators G1 and G2 and loads B1 and B2. On the other hand, in the switching pattern P2, the generator G1 and the load B2 are incorporated into another system, and the components constituting the power supply area (the range of the power system) may change. In such a case, the switching support function sums up the transmission loss, the renewable energy source control amount, and/or the increase margin constraint amount in the same power system range in the switching pattern P1 and the switching pattern P2, and rearranges the switching patterns. For example, in the switching pattern P1, when the A system has the generators G1 and G2 and the loads B1 and B2 as components, and the B system has the generators G3 and G4 and the loads B3 and B4 as components, when switching to the switching pattern P2, the generator G1 and the load B2 will belong to the B system from the A system. In this case, the switching support function can be configured to rearrange the switching patterns P1 and P2 by summing up the transmission loss, the renewable energy source control amount, and/or the increase margin constraint amount in the A system and the B system for each of the switching patterns P1 and P2.

Next, the power system switching support process according to this embodiment will be described. FIGS. 7 and 8 are flowcharts showing the power system switching support process according to this embodiment. The power system switching support process shown in FIGS. 7 and 8 is executed by the arithmetic unit 12 of the power system switching support device 10.

First, in step S101, the power equipment shutdown plan information is acquired by the shutdown plan acquisition function. In this embodiment, the database 14 stores power equipment shutdown plans for one or more pieces of power equipment, and the computing device 12 refers to the database 14 to acquire one or more pieces of power equipment shutdown plan information.

In step S102, the pattern extraction function extracts switching pattern information corresponding to the power equipment shutdown plan information acquired in step S101. Specifically, the pattern extraction function refers to the database 14 and extracts multiple pieces of switching pattern information (information including the name (or identification information) of the switching pattern, connection points, and release points) linked to the target power equipment of the power equipment shutdown plan information from the switching pattern table shown in FIG. 3.

In step S103, the power flow calculation function calculates the power flow when the target power equipment is stopped and the power system configuration is not switched. Specifically, the power flow calculation means obtains known parameters of each component included in the power system (e.g., electrical constants and connection states of power distribution equipment such as transformers and transmission lines) from the database 14, and calculates the power flow when the target power equipment is stopped in the current power system configuration based on these parameters, meteorological information, and statistical information on the amount of power generated by renewable energy sources and the amount of power consumed by substations.

In the following steps S104 to S108, processing is performed for each switching pattern extracted in step S102. In the following, the switching pattern for which processing is performed is referred to as the target switching pattern.

First, in step S104, the power flow calculation means calculates the power flow when the target power equipment is stopped and the power system configuration is switched to the target switching pattern configuration. Note that also in step S104, the power flow calculation function acquires known parameters of each component included in the power system (e.g., electrical constants and connection states between power distribution equipment such as transformers and transmission lines), and calculates the power flow when the target power equipment is stopped in the target switching pattern configuration based on these parameters, weather conditions, power generation amounts of renewable energy sources, and statistical information on past performance.

In step S105, the boost constraint calculation function calculates the boost constraint amount in the target switching pattern. Specifically, based on the power flow calculated in step S103 when the target power equipment is stopped and the configuration of the power system is not switched, and the power flow calculated in step S104 when the target power equipment is stopped and the configuration of the power system is switched to the target switching pattern, it is determined whether or not a power distribution facility that exceeds the operating capacity will occur. For example, the boost constraint calculation function determines whether or not a power distribution facility that exceeds the operating capacity of the transmission line will occur when the target regulating power source is operated at a rated value when the configuration of the power system is switched to the configuration of the target switching pattern. If the boost constraint calculation function determines that no power distribution facility that exceeds the operating capacity will occur, it calculates the boost constraint amount as zero. On the other hand, if the boost constraint calculation function determines that a power distribution facility that exceeds the operating capacity will occur, it reduces the output of the regulating power source and suppresses it until the expected flow does not exceed the operating capacity of the power distribution facility. The boost constraint calculation function sets the output of the regulated power source when the expected power flow no longer exceeds the operational capacity of the power distribution facility as the output upper limit, and calculates the suppression amount of the regulated power source (the rated output of the regulated power source - the output upper limit of the regulated power source after switching the configuration of the power system) as the boost constraint amount. Note that if the expected power flow exceeds the operational capacity of the power distribution facility even when the regulated power source is suppressed to the output lower limit, the output lower limit of the regulated power source is set as the output upper limit.

In step S106, the renewable energy power control amount calculation function calculates the renewable energy power control amount in the target switching pattern. Specifically, the renewable energy power control amount calculation function determines whether or not a power distribution facility that exceeds the operating capacity will be generated based on the power flow calculated in step S103 when the target power equipment is stopped and the configuration of the power system is not switched, and the power flow calculated in step S104 when the target power equipment is stopped and the configuration of the power system is switched to the target switching pattern. For example, the renewable energy power control amount calculation function determines whether or not a power distribution facility that exceeds the operating capacity of the transmission line will be generated when the renewable energy power source is operated according to the predicted value when the configuration of the power system is switched to the configuration of the target switching pattern. If the renewable energy power control amount calculation function determines that no power distribution facility that exceeds the operating capacity will be generated, it calculates the renewable energy power control amount as zero. On the other hand, if the renewable energy power source control amount calculation function determines that a power distribution facility will exceed its operating capacity, it calculates the renewable energy power source control amount as follows:

That is, the renewable energy power source control amount calculation function changes the power generation schedule of the target power source in accordance with a predetermined suppression rule (suppression order) for the power distribution equipment that has exceeded its operating capacity in the calculation result of the power flow of the target switching pattern in steps S103 and S104, and suppresses the expected flow until it does not exceed the operating capacity of the power distribution equipment. Then, the renewable energy power source control amount calculation function calculates the suppression amount of the renewable energy power source when the expected flow does not exceed the operating capacity of the power distribution equipment (pre-suppression predicted power generation value of the renewable energy power source connected to the system under the power distribution equipment - predicted post-suppression value of the renewable energy power source connected to the system under the power distribution equipment when power generation suppression is performed in accordance with the suppression rule to the extent that the operating capacity of the power distribution equipment is not exceeded) as the renewable energy power source control amount. In addition, the renewable energy power source control amount calculation function calculates the renewable energy power source control amount for multiple times of the stop time, stop operation time, and recovery operation time of the target power equipment.

In step S107, the transmission loss calculation function calculates the transmission loss. Specifically, the transmission loss calculation function calculates the transmission loss in the power flow when the target power equipment is stopped in the target switching pattern configuration based on known parameters of each component included in the power system (for example, electrical constants such as the resistance value of the transmission line), weather conditions, the power generation amount of the renewable energy power source, and past performance statistical information. The transmission loss calculation function can calculate the transmission loss in a pre-defined power supply area by accumulating the transmission loss calculated for each power distribution equipment such as a transmission line.

In step S108, the switching support function adds information about the target switching patterns to the support information. In this embodiment, the support information is a list for registering switching patterns to be presented to the system operator, and the switching support function adds information about all target switching patterns to the list of support information.

In step S109, it is determined whether or not the processing of steps S104 to S108 has been performed for all switching patterns corresponding to the target power equipment. If the processing of steps S104 to S108 has not been performed for all switching patterns, the process returns to step S104, and the processing of steps S104 to S108 is repeated with another switching pattern as the target switching pattern. On the other hand, if the processing of steps S104 to S108 has been performed for all switching patterns, the process proceeds to step S110 in FIG. 8.

In step S110, the switching support function acquires information on the target power equipment and the target date and time to be displayed. For example, in this embodiment, the grid operator operates the input device 17 to specify the target power equipment and the target date and time to be displayed, and the switching support function can acquire information on the target power equipment and the target date and time to be displayed.

In step S111, the switching support function sorts the switching patterns added to the support information in step S109 in ascending order of the pay-for-increase constraint amount calculated in step S106, the renewable energy power source control amount calculated in step S107, and/or the transmission loss calculated in step S108, as shown in FIG. 4, and displays them on the display device 15. The system operator can operate the input device 17 to arbitrarily change the sorting priority order for the pay-for-increase constraint amount, the renewable energy power source control amount, and the transmission loss. In this way, the switching support function sorts the switching patterns in ascending order of the specified priority order in a list box on the management screen, thereby presenting the system operator with the optimal switching pattern depending on the situation and supporting the system operator in switching the power system configuration.

In step S112, the switching support function determines whether or not a switching pattern corresponding to the target power facility has been selected. For example, if a switching pattern has been set by default, or if the system operator has operated the input device 17 to set a switching pattern displayed in the list box, the process proceeds to step S113. On the other hand, if a switching pattern has not been set, the process waits in step S112 until a switching pattern is set.

In step S113, a switching pattern is selected, and the switching support function displays on the display device 15 the up-consumption constraint amount, the renewable energy power control amount, and/or the transmission loss at each time during the stop time, the stop operation time, and the restoration operation time of the target power equipment, which are calculated in the configuration of the selected switching pattern. For example, the switching support function can be configured to display the up-consumption constraint amount, the renewable energy power control amount, and the transmission loss for each switching pattern on the switching management screen and the switching management details screen, as shown in Figures 4 and 5. In this embodiment, the up-consumption constraint amount, the renewable energy power control amount, and/or the transmission loss are calculated at regular time intervals (for example, every 30 minutes) during the stop time, the stop operation time, and the restoration operation time of the target power equipment, and the switching support function can display the up-consumption constraint amount, the renewable energy power control amount, and the transmission loss at regular time intervals (for example, every 30 minutes) on the management screen displayed on the display device 15, as shown in Figure 5.

Furthermore, in step S113, as shown in FIG. 6, the switching support function can display, as switching support information, renewable energy power source control information including, for each renewable energy power source, whether or not the renewable energy power source is controlled, the reason for controlling the renewable energy power source, and the time when the renewable energy power source is controlled. The switching support function can also be configured to display, as the renewable energy power source control information, information that visually indicates the degree of grid congestion. Furthermore, the switching support function can display renewable energy power source control information such as the degree of grid congestion at regular time intervals (for example, every 30 minutes).

In this embodiment, the switching patterns are linked to the power equipment shutdown plan and displayed as options in the order of recommendation. In this embodiment, the calculation results that are the basis for the display order are the up-contract amount, the renewable energy power source control amount, and the power transmission loss, but are not limited to this, and can be configured to display, for example, the supply reliability, the available capacity of the power distribution equipment, etc. In addition, various parameters to be determined in system operation can be added. In the example shown in FIG. 5 above, when showing the time series data of the up-contract amount, the renewable energy power source control amount, and the power transmission loss, an example is shown in which a day is divided into 48 points and displayed every 30 minutes, but this is not limited to this, and it can also be every 15 minutes, etc. This allows the system operator to understand the time transition of the up-contract amount, the renewable energy power source control amount, and the power transmission loss in the set switching pattern.

Example 1
Next, an example (Example 1) of the power system transfer support device 10 according to the first embodiment will be described. Example 1 shows a scene in which the increase margin constraint amount, the renewable energy power source suppression amount, and the transmission loss are simulated when the configuration of the power system is switched in a plurality of switching patterns in a power system modeled on an actual power system. In addition, in the configuration of Example 1, the generators include an regulated power source G1, extra-high renewable energy power sources G2 to G5, and high and low voltage renewable energy power sources (not shown, hereinafter simply referred to as high and low voltage renewable energy power sources) that belong to the distribution transformers of each substation, and when the power flow flowing through the power distribution equipment in the power system exceeds the operating capacity of the equipment due to the difference between the amount of power generated by the regulated power source G1, the extra-high renewable energy power sources G2 to G5, and the high and low voltage renewable energy power sources in the power system and the power demand in the power system, the output of the regulated power source G1 is controlled preferentially, and when the output control of the regulated power source G1 alone is insufficient, the output of the extra-high renewable energy power sources G2 to G5 and the high and low voltage renewable energy power sources is controlled. Specifically, in Example 1, the regulated power source G1 has a rated output of 300 MW and a minimum output of 125 MW, and is operated to control the output of the extra-high voltage renewable energy power sources G2 to G5 and the high and low voltage renewable energy power sources when the increase margin constraint amount reaches 175 MW (rated output of the regulated power source 300 MW - minimum output 125 MW, i.e., the regulated power source is suppressed to its minimum output).

Figures 9 to 12 show the configuration of the power system in each switching pattern. Specifically, Figure 9 shows the configuration of the power system in normal times (switching pattern 1), with circuit breaker C1 turned off to separate the power system into power supply areas A1 and A2. Figure 10 shows the configuration of the power system in another switching pattern (switching pattern 2), with circuit breaker C1 turned on and circuit breaker C2 turned off to separate the power system into power supply areas A3 and A4. Similarly, FIG. 11 shows the configuration of the power system in switching pattern 3, with circuit breakers C1 and C2 turned on and circuit breaker C3 turned off, separating the power system into power supply area A5 and power supply area A6, and FIG. 12 shows the configuration of the power system in switching pattern 4, with circuit breakers C1 to C3 turned on and circuit breaker C4 turned off, separating the power system into power supply area A7 and power supply area A8.

Figure 13 is a diagram showing the simulation results of the up-contract constraint amount, the renewable energy source suppression amount, and the transmission loss based on the power flow every 30 minutes in the power system configuration of switching patterns 1 to 4 of Example 1. The power system switching support device 10 according to this embodiment can calculate the power flow, up-contract constraint amount, the renewable energy source suppression amount, and the transmission loss for each switching pattern at regular intervals in a manner similar to the simulation of Example 1.

Here, the power system configuration of Example 1 shown in Figures 9 to 12 has two main electric power stations, the rated capacity of the interconnection transformer of X main electric power station is 150 MVA x 2 units = 300 MVA, and the rated capacity of the interconnection transformer of Y main electric power station is 200 MVA x 2 units = 400 MVA. Also, regulated power source G1 is connected to X main electric power station. Furthermore, extra-high-voltage renewable energy power sources G2 to G5 are connected to X main electric power station or Y main electric power station via transmission lines, and substations A to J connected to loads or generators (not shown) are connected to X main electric power station or Y main electric power station via transmission lines. Furthermore, the power generation of extra-high-voltage renewable energy sources G2 to G5 and high and low voltage renewable energy sources will peak at noon, and if the power generation exceeds the operating capacity of the power distribution facility, the power flow will be controlled by controlling the output of regulated power source G1 and the output of extra-high-voltage renewable energy sources G2 to G5 and high and low voltage renewable energy sources.

In the power system configuration of switching pattern 1 shown in Figure 9, by turning off circuit breaker C1, in power supply area A1, extra-high-voltage renewable energy power source G2 is connected to X main electric power station, which has a small rated capacity (300 MVA) of the interconnection transformer, and in power supply area A2, extra-high-voltage renewable energy power sources G3 to G5 are connected to Y main electric power station, which has a large rated capacity (400 MVA) of the interconnection transformer. Even in this case, at noon in the daytime, when the power generation of extra-high-voltage renewable energy power sources G2 to G5 and high and low voltage renewable energy power sources peaks, the power flow to X main electric power station will be 408.7 MW, which exceeds the rated capacity of the interconnection transformer of 300 MVA, so the output of regulated power source G1 at X main electric power station is suppressed to the minimum output value. Specifically, in the example shown in FIG. 9, at noon during the day when the power generation of the extra-high voltage renewable energy power source G2 and the high and low voltage renewable energy power sources under the distribution transformers of substations B, C, E to I reaches its peak, the increase margin constraint amount is 408.7VM-300MVA=108.7MW, and it is sufficient to restrict the output of the regulated power source G1 to 300MW-108.7MW=191.3MW. There is no need to restrict the output of the regulated power source G1 to the minimum output of 125MW. Therefore, output control of the extra-high voltage renewable energy power source G2 and the high and low voltage renewable energy power sources under the distribution transformers of substations B, C, E to I is not performed. In the example shown in FIG. 9, at 12:00 in the daytime when the power generation of the high- and low-voltage renewable energy power sources belonging to the distribution transformers of the extra-high-voltage renewable energy power sources G3 to G5 and the substations A, J, and L to O reaches its peak, the power generation is within the rated capacity of the interconnection transformer in the Y main power station, so no output restriction is performed on the high- and low-voltage renewable energy power sources belonging to the distribution transformers of the extra-high-voltage renewable energy power sources G3 to G5 and the substations A, J, and L to O. The transmission loss at this time is 5.6 MW in total for the X main power station and the Y main power station. Similarly, by calculating the boost constraint amount, the renewable energy power source control amount, and the transmission loss at other times, in the configuration of the power system of the switching pattern 1 shown in FIG. 9, the daily total of the boost constraint amount is 1089.7 MW, the daily total of the renewable energy power source suppression amount is 0 MW, and the daily total of the transmission loss is 67.8 MW, as shown in FIG. 13.

In addition, in the power system configuration of switching pattern 2 shown in FIG. 10, by turning on circuit breaker C1 and turning off circuit breaker C2, compared to the configuration of normal times (switching pattern 1) shown in FIG. 9, substations G to I connected to loads and generators are switched from power supply area A3 where main electric power station X exists to power supply area A4 where main electric power station Y exists. In the example shown in FIG. 10, the amount of generated power exceeds the amount of power consumed in substations G to I, and by connecting substations G to I to main electric power station Y, the amount of up-consumption constraint in main electric power station X decreases compared to the configuration shown in FIG. 9. Specifically, as shown in FIG. 13, the daily total of the up-consumption constraint amount is 734.5 MW. In the example shown in FIG. 10, as in the example shown in FIG. 9, even if the amount of power generated in power supply area A3 exceeds the operating capacity of the interconnection transformer of main electric power station X, the daily total of the renewable energy source suppression amount remains unchanged at 0 MW because it is sufficient to control the output of regulating power source G1. On the other hand, because substations G to I are connected to the Y main power station, the transmission distance increases and transmission losses increase, so the total daily transmission loss increases to 81.2 MW, as shown in Figure 13.

In the power system configuration of switching pattern 3 shown in Figure 11, by turning on circuit breakers C1 and C2 and turning off circuit breaker C3, compared to the normal state (switching pattern 1) configuration shown in Figure 9, the X main power station is further connected to extra-high-voltage renewable energy sources G3 and G4 and substations A (part), J, and L. This increases the power flow to the interconnection transformer of the X main power station, and increases the up-contract amount of the regulating power source G1 accordingly. Specifically, in the power system configuration of switching pattern 3, as shown in Figure 13, the daily total up-contract amount is 2526.4 MW, which is approximately 2.3 times that of the power system configuration of switching pattern 1. In addition, in the configuration of the power system of switching pattern 3 shown in FIG. 11, there are time periods when the power flow through the interconnection transformer of the X main power station does not fall below the operating capacity of the interconnection transformer of the X main power station by simply lowering the output of the regulating power source G1 to the minimum output. In this case, the output of the extra-high-voltage renewable energy sources G2 to G4 and the high and low voltage renewable energy sources under the distribution transformers of substations A (part), B, C, E to J, and L is controlled. As a result, as shown in FIG. 13, the daily total of the renewable energy source control amount increases to 251.2 MW. On the other hand, in the configuration of the power system of switching pattern 3 shown in FIG. 11, the transmission loss decreases, and the daily total of the transmission loss falls to 55.5 MW as shown in FIG. 13.

Furthermore, in the power system configuration of switching pattern 4 shown in Figure 12, by turning on circuit breakers C1 to C3 and turning off circuit breaker C4, compared to the configuration of switching pattern 3 shown in Figure 11, the X main power station is further connected to extra-high-voltage renewable energy power source G5 and substations A (all) and M. This further increases the power flow through the interconnection transformers of the X main power station, and accordingly the up-consumption margin constraint amount increases further. Specifically, in the power system configuration of switching pattern 4, as shown in Figure 13, the daily total up-consumption margin constraint amount is 3,271.0 MW, which is higher than the up-consumption margin constraint amount in the configuration of switching pattern 3. In addition, even in the power system configuration of switching pattern 4 shown in FIG. 12, there are time periods when the power flow through the interconnection transformer of the X main power station does not fall below the operating capacity of the power distribution facility simply by setting the output of the regulating power source G1 to the minimum output, and output suppression of the high and low voltage renewable energy sources under the distribution transformers of the extra-high voltage renewable energy sources G2 to G5 and the substations A, B, C, E to J, and L is required. As a result, as shown in FIG. 13, the daily total of the renewable energy source control amount is 1103.9 MW, which is higher than the renewable energy source control amount of switching pattern 3. On the other hand, in the power system configuration of switching pattern 4 shown in FIG. 12, the transmission loss is reduced compared to the power system configuration of switching pattern 3 shown in FIG. 11, and the daily total of the transmission loss falls to 48.1 MW as shown in FIG. 13.

In the examples shown in Figures 9 to 12, the power system shown in Figures 9 to 12 is the power system to be monitored. However, if the power system shown in Figures 9 to 12 is part of the power system to be monitored (whole power supply area), it is preferable to determine and evaluate the transmission loss of the entire power supply area based on the power flow of the entire power system to be monitored, including not only the power flow of this power system model shown in Figures 9 to 12 but also the power flows of other systems. For example, if the amount of power generated by this power system model shown in Figures 9 to 12 is suppressed, it is necessary to increase the amount of power generated by other systems in order to maintain the balance between power generation and demand in the entire power supply area. In this case, it is preferable to determine and evaluate the transmission loss of the entire power supply area based on the changed power flow of this power system model and the power flows of other systems.

In the first embodiment, as shown in FIG. 13, when the increase margin constraint amount, the renewable energy power source suppression amount, and the transmission loss are calculated, the power system switching support device 10 can create a list in which the "renewable energy power source control amount" is given the highest priority, the "transmission loss" is given the second priority, and the "increase margin constraint amount" is given the last priority by arranging the switching patterns 1 to 4 shown in FIG. 9 to 12 in the order of switching pattern 1, switching pattern 2, switching pattern 3, and switching pattern 4 from top to bottom, and present the list to the system operator.

The switching support function of the power system switching support device 10 can also be configured to display the trends in the charge-back constraint amount, the renewable energy power source suppression amount, and the transmission loss in each switching pattern in a graph, as shown in FIG. 14. FIG. 14 is an example of a graph showing the trends in the charge-back constraint amount, the renewable energy power source suppression amount, and the transmission loss in the configuration of the power system in switching patterns 1 to 4 of the first embodiment, where (A) shows the trends in the charge-back constraint amount for switching patterns 1 to 4, (B) shows the trends in the renewable energy power source suppression amount for switching patterns 1 to 4, and (C) shows the trends in the transmission loss for switching patterns 1 to 4. In this way, the power system switching support device 10 can intuitively grasp how the charge-back constraint amount, the renewable energy power source suppression amount, and the transmission loss in each switching pattern will change by displaying the trends in the charge-back constraint amount, the renewable energy power source suppression amount, and the transmission loss in each switching pattern, thereby supporting the system operator in switching the configuration of the power system.

Furthermore, the switching support function of the power system switching support device 10 can be configured to display the transition of the total power flow (continuous power flow) of each interconnection transformer of the X main electric power station and the Y main electric power station for each switching pattern as a graph, as shown in Figure 15. Here, Figure 15 (A) is a graph showing the transition of the continuous power flow of the X main electric power station and the Y main electric power station in switching pattern 1, Figure 15 (B) is a graph showing the transition of the continuous power flow of the X main electric power station and the Y main electric power station in switching pattern 2, Figure 15 (C) is a graph showing the transition of the continuous power flow of the X main electric power station and the Y main electric power station in switching pattern 3, and Figure 15 (D) is a graph showing the transition of the continuous power flow of the X main electric power station and the Y main electric power station in switching pattern 4. As shown in FIG. 15, the power system switching support device 10 can be configured to display the rated capacities of the interconnection transformers of the X main electric utility station and the Y main electric utility station in a superimposed manner, as well as to display the interconnection flow when the output of the regulated power source G1, the extra-high-voltage renewable energy power sources G2 to G5, and the high- and low-voltage renewable energy power sources is not suppressed. This allows the system operator to intuitively grasp the transition of the interconnection flow of the X main electric utility station and the Y main electric utility station in each configuration of the power system, and supports the system operator in switching the configuration of the power system.

As described above, the power system switching support device 10 according to the present embodiment is a power system switching support device 10 for supporting the switching operation of the configuration of the power system when a power equipment shutdown plan for shutting down the power equipment is formulated and equipment shutdown work is performed. Information on the target power equipment to be shut down is acquired as target power equipment information, and multiple configuration patterns of the power system to be switched when the target power equipment is shut down are stored as switching patterns. When the target power equipment information is acquired, the transmission loss is calculated for each switching pattern according to the multiple switching patterns corresponding to the target power equipment, and support information that prioritizes a switching pattern with small transmission loss, support information that prioritizes a reduction in the renewable energy power source control amount, support information that prioritizes the operation constraint amount of the regulated power source, and support information that combines multiple support information are output. As a result, the system operator can visualize both the supply and demand constraint and the transportation constraint, and can grasp the optimal switching pattern according to the situation based on the supply and demand operation aspect, and can perform the switching work of the power system configuration more appropriately and efficiently based on this support information.

In addition, in this embodiment, when the target power equipment is stopped, the power flow when the power system is switched to the switching pattern configuration is compared with the power flow when the power system is not switched, and the transmission loss, renewable energy power source control amount, and increase margin constraint amount of each switching pattern are compared for each transmission line, and the total values of each are calculated, or the switching patterns are sorted in ascending order of transmission loss, renewable energy power source control amount, and increase margin constraint amount for each transmission individually, and information is output as support information. This makes it possible to present information on switching patterns in which the power flow changes due to switching of the power system configuration to the system operator as support information.

Furthermore, in this embodiment, the transmission loss, the renewable energy power source control amount, and the increase constraint amount are calculated for each switching pattern at multiple times within the stop time, stop operation time, and restoration operation time of the target power equipment in the power equipment stop plan, and when a switching pattern is selected, information on the transmission loss, the renewable energy power source control amount, and the increase constraint amount at multiple times for the configuration of the selected switching pattern is included in the support information and output. This allows the system operator to grasp the time transition of the loss current in the selected switching pattern, and can use it as a reference for determining a switching pattern taking into account the time period required for the system switching operation that is associated with the power equipment stop plan and is combined. This is because the system switching operation may take a long time, for example, several hours, and the transmission loss, the renewable energy power source control amount, and the increase constraint amount of the regulating power source change depending on the time period, such as whether the system operation time for the equipment stop is daytime or nighttime, in correlation with the time of the equipment stop work. In this way, by helping to select the optimal candidate for a combination of multiple power equipment shutdown plans and the corresponding grid switching patterns, it is possible to take into account the time required for grid switching operations, evaluate periods such as one day, one week, or one month, and provide support to minimize the opportunities to curtail the output of renewable energy sources.

Second Embodiment
Next, a second embodiment of the present invention will be described. The power system transfer support device 10 according to the second embodiment has a similar configuration to the power system transfer support device 10 according to the first embodiment, and operates in the same manner as the power system transfer support device 10 according to the first embodiment, except that it operates as described below.

In the second embodiment, the power system switching support device 10 predicts the allowance constraint amount, the renewable energy source suppression amount, and the transmission loss in each switching pattern when a new component is added to the current power system configuration or an existing component is deleted, and presents them to the system operator. Specifically, the power system switching support device 10 predicts the allowance constraint amount, the renewable energy source suppression amount, and the transmission loss according to the increase or decrease in generators such as renewable energy sources or the increase or decrease in load based on the current power system configuration and statistical information on the past performance of the power generation or power consumption of each power plant, and calculates them for each hour.

In order to perform such a function, the arithmetic device 12 has a configuration change function for changing the configuration of the current power system in addition to the function according to the first embodiment. Specifically, the configuration change function can acquire configuration data of the current power system and change (set) the configuration of the current power system based on the instruction of the system operator via the input device 17. For example, the configuration change function can install new components (generators, loads, and transmission lines such as renewable energy sources) at any position on the configuration data of the current power system, or delete existing generators and loads from the configuration. In addition, when installing new generators and loads based on the instruction of the system operator, the configuration change function can appropriately input (set) data of components required for calculating power flow, up-consumption constraint amount, renewable energy source suppression amount, transmission loss, etc., such as rated output, rated capacity, transmission capacity of transmission lines, impedance, etc.

In addition, in the second embodiment, the power flow calculation function can be configured to calculate the power flow for each switching pattern based on the configuration of the power system changed by the configuration change function. Similarly, the renewable energy power source control amount calculation function, the up-front constraint amount calculation function, and the transmission loss calculation function can be configured to calculate the renewable energy power source control amount, up-front constraint amount, and transmission loss for each switching pattern based on the configuration of the power system changed by the configuration change function.

Example 2
Next, an example (Example 2) of the power system transfer support device 10 according to the second embodiment will be described. In Example 2, the power system transfer support device 10 shows a scene in which the power system operator is presented with the renewable energy power source suppression amount, the increase margin constraint amount, and the transmission loss when extra-high-voltage renewable energy power sources G6 to G8 and the regulating power source G9 are added to the current power system configuration shown in Figs. 9 to 12. The extra-high-voltage renewable energy power sources G6 to G8 have rated outputs of 30 MW, 20 MW, and 10 MW, respectively, and the regulating power source G9 has a rated output of 150 MW and a minimum output of 75 MW. The regulating power source G9 is also connected to the Y main power station.

Figure 16 is a diagram showing the state in which extra-high voltage renewable energy power sources G6 to G8 and regulated power source G9 are added to the power system configuration of switching pattern 1 shown in Figure 9. When the power generation of extra-high voltage renewable energy power sources G2 to G8 and high and low voltage renewable energy power sources peaks at 12 o'clock, in the switching pattern 1 configuration shown in Figure 16, the power flow to the X main power station will be 431.8 MW, which exceeds the rated capacity of the interconnection transformer of 300 MW, and output control of the regulated power source G1 will be performed. In addition, in the example shown in FIG. 16, extra-high voltage renewable energy power sources G3 to G8, regulated power source G9, and high and low voltage renewable energy power sources under the distribution transformers of substations A, J, and L to O are connected to the Y main power station, and when the power generation of the extra-high voltage renewable energy power sources G3 to G8 and the high and low voltage renewable energy power sources under the distribution transformers of substations A, J, and L to O peaks at 12 o'clock, a power flow of 644.6 MW will be generated to the Y main power station, exceeding the rated capacity of the interconnection transformer of 400 MW, and the output of the regulated power source G9 will also be suppressed. In the example shown in FIG. 16, the maximum allowable power constraint amount for the regulated power source G9 in the Y main power station is 75 MW, so if the output of the regulated power source G9 is controlled only, the expected power flow will exceed the operating capacity of the interconnection transformer of the Y main power station, and therefore output suppression is also performed for the extra-high-voltage renewable energy sources G3 to G8 and the high and low voltage renewable energy sources under the distribution transformers of the substations A, J, and L to O. As a result, as shown in FIG. 20, in the configuration of the power system of the switching pattern 1 shown in FIG. 16, the daily total allowable power constraint amount is 2721.7 MW, the daily total renewable energy source control amount is 1271.3 MW, and the daily total transmission loss is 116.5 MW.

Also, FIG. 17 is a diagram showing a state in which extra-high renewable energy sources G6 to G8 and regulated power source G9 are added to the configuration of the power system of the switching pattern 2 shown in FIG. 10. When the power generation of the extra-high renewable energy sources G2 to G8 and the high and low voltage renewable energy sources peaks at 12 o'clock, in the configuration of the switching pattern 2 shown in FIG. 17, there is a power flow of 365.8 MW to the X main electric station, which exceeds the rated capacity of the interconnection transformer of 300 MW, and only the output control of the regulated power source G1 is performed. In addition, in the configuration of the switching pattern 2 shown in FIG. 17, there is a power flow of 710.6 MW to the Y main electric station, which exceeds the rated capacity of the interconnection transformer of 400 MW, and in addition to the output control of the regulated power source G9, the output suppression of the extra-high renewable energy sources G3 to G8 and the high and low voltage renewable energy sources belonging to the distribution transformers of the substations A, G to J, and L to O is also performed. As a result, as shown in FIG. 20, in the power system configuration of switching pattern 2 shown in FIG. 17, the daily total of the increase margin constraint amount is 1912.5 MW, the daily total of the renewable energy power source control amount is 1964.0 MW, and the daily total of the transmission loss is 119.8 MW.

Furthermore, FIG. 18 is a diagram showing the state in which extra-high-voltage renewable energy sources G6 to G8 and regulated power source G9 are added to the configuration of the power system of switching pattern 3 shown in FIG. 11. At 12:00, when the power generation of extra-high-voltage renewable energy sources G2 to G8 peaks, there is a power flow of 608.4 MW to the X main power station, exceeding the rated capacity of the interconnection transformer of 300 MW, and output suppression of the regulated power source G1 and output suppression of the extra-high-voltage renewable energy sources G2 to G4 and the high and low voltage renewable energy sources under the distribution transformers of substations A (part), B, C, E to J, and L are performed. In addition, in the configuration of switching pattern 3 shown in FIG. 18, there is a power flow of 468.4 MW to the Y main power station, exceeding the rated capacity of the interconnection transformer of 400 MW, and output control is performed by the regulated power source G9. As a result, as shown in FIG. 20, in the power system configuration of switching pattern 3 shown in FIG. 18, the daily total of the increase margin constraint amount is 3493.2 MW, the daily total of the renewable energy power source control amount is 1041.0 MW, and the daily total of the transmission loss is 102.7 MW.

In addition, FIG. 19 is a diagram showing a state in which extra-high renewable energy power sources G6 to G8 and regulated power source G9 are added to the configuration of the power system of switching pattern 4 shown in FIG. 12. At 12 o'clock, when the power generation of extra-high renewable energy power sources G2 to G8 and high and low voltage renewable energy power sources peaks, there is a power flow of 786.4 MW to the X main electric power station, which exceeds the rated capacity of the interconnection transformer of 300 MW, and output control of the regulated power source G1 and output control of the extra-high renewable energy power sources G2 to G6 and the high and low voltage renewable energy power sources under the distribution transformers of substations A (all), B, C, E to J, L, and M are performed. In addition, in the configuration of switching pattern 4 shown in FIG. 19, a power flow of 290 MW within the range of the rated capacity of the interconnection transformer of 400 MW is predicted for the Y main electric power station, so output control of the regulated power source G9 and output control of the extra-high renewable energy power sources G7 and 8 are not performed. As a result, as shown in FIG. 20, in the power system configuration of switching pattern 4 shown in FIG. 19, the daily total of the increase margin constraint amount is 4982.9 MW, the daily total of the renewable energy source suppression amount is 3323.1 MW, and the daily total of the transmission loss is 71.6 MW.

In the second embodiment, as shown in FIG. 20, when the increase margin constraint amount, the renewable energy power source suppression amount, and the power transmission loss are calculated, the power system switching support device 10 can create a list that prioritizes the "renewable energy power source control amount" and the smallest "renewable energy power source control amount" and present it to the system operator by arranging the switching patterns 1 to 4 shown in FIGS. 16 to 19 from top to bottom in the order of switching pattern 3, switching pattern 1, switching pattern 2, and switching pattern 4 when the system operator operates the input device 17 to set the priority of the "renewable energy power source control amount" to "1," the priority of the "transmission loss" to "2," and the priority of the "increase margin constraint amount" in the "sort switching" list box on the screen shown in FIG. 4 and makes a display request.

As described above, in the power system switching support device 10 according to the second embodiment, in addition to the functions of the first embodiment, in the changed power system configuration in which a new component is added to the current power system configuration or an existing component is deleted, the device can present the trends in the renewable energy power source control amount, the increase margin constraint amount, and the transmission loss for each switching pattern. As a result, in the second embodiment, the system operator can be made to know in advance the renewable energy power source control amount, the increase margin constraint amount, and the transmission loss for each switching pattern in the case where the current power system configuration is changed, and therefore in addition to being able to support the system operator in switching the power system configuration, it can also support the task of changing the power system configuration.

The above describes preferred embodiments of the present invention, but the technical scope of the present invention is not limited to the above description of the embodiments. Various modifications and improvements can be made to the above embodiments, and such modifications or improvements are also included in the technical scope of the present invention.

For example, in the above-mentioned embodiment, a configuration in which one power facility is stopped is described as an example, but the present invention is not limited to this configuration, and two or more power facilities can be stopped simultaneously. In this case, the power system switching support device 10 can be configured to present support information that prioritizes switching patterns with small transmission losses, renewable energy power source control amounts, and up-rate constraint amounts for each target power facility by executing the power system switching support process shown in FIG. 4 and FIG. 5 for each power facility shutdown plan. In this case, if there are multiple facility shutdowns at the same time, the power flow is calculated by linking the information on the connection points and opening points for each power facility shutdown plan, assuming that the other power facility shutdown plan is being executed. In addition, the power system switching support device 10 can be configured to calculate the power flow, transmission losses, renewable energy power source control amounts, and up-rate constraint amounts at each time for combinations of switching patterns corresponding to two or more target power facilities, even if the combination changes due to multiple facility shutdown plans, and present support information to the system operator that prioritizes switching patterns with small transmission losses, renewable energy power source control amounts, and up-rate constraint amounts.

In the above-described embodiment, the smallest unit for providing weather information is a mesh for each region, and the power flow and transmission loss, the renewable energy power source control amount, and the up-front constraint amount are calculated in combination with information on the power plants and transmission and distribution lines connected to the power stations and demand locations located there. However, the present invention is not limited to this configuration, and the power flow and transmission loss, the renewable energy power source control amount, and the up-front constraint amount can be calculated in combination with information on power generation and demand that is based on a region including multiple meshes and information on power generation and demand that is not based on latitude and longitude and is linked to power plants, substations, and transmission lines that are components of the power system.

In addition, in the above-described embodiment, the support information is exemplified as information in which switching patterns are arranged in order of smallest transmission loss, or information on the renewable energy power source control amount or the boost constraint amount of the regulating power source, or a combination of multiple information. However, the present invention is not limited to this configuration, and it is also possible to present support information in which only the switching pattern with the smallest transmission loss is placed at the top, and information on switching patterns arranged in a different order as an order display in the next hierarchy. In addition, it is also possible to present support information that prioritizes switching patterns with small transmission loss, renewable energy power source control amount, and boost constraint amount by highlighting the information on switching patterns with transmission loss, renewable energy power source control amount, and boost constraint amount below a predetermined value, for example by displaying them in a text color or in bold.

In addition, the first embodiment described above exemplifies a configuration in which the renewable energy power source control amount, the increase margin constraint amount, and the transmission loss are calculated and presented for each switching pattern in the current power system configuration, and the second embodiment described above exemplifies a configuration in which the renewable energy power source control amount, the increase margin constraint amount, and the transmission loss are calculated and presented when the components in the current power system configuration are changed. In addition to this, or instead of this, a configuration can also be used in which the renewable energy power source control amount, the increase margin constraint amount, and the transmission loss are presented for each switching pattern when the rated output or power consumption of the generator or load is changed while maintaining the same configuration as the current power system configuration.

Reference Signs List 10 power system switching support device 11 communication device 12 arithmetic device 13 storage device 14 database 15 display device 16 notification device 17 input device

Claims (13)

A power system switching support device for supporting a power system switching operation,
A storage means for storing a plurality of switchable configuration patterns of the power system as switching patterns;
A calculation means for calculating, for each of the switching patterns, a transmission loss in a power distribution facility constituting a power system, an increase margin constraint amount that suppresses the output of a regulating power source, and/or a renewable energy power source control amount that suppresses the output of a renewable energy power source when the switching pattern is set;
and a switching support means for outputting, as support information, information indicating the plurality of switching patterns, the plurality of switching patterns being rearranged based on a transmission loss, an up-consumption limit amount, and/or a renewable energy power source control amount calculated by the calculation means. The power equipment shutdown plan further includes an equipment information acquisition means for acquiring information on a target power equipment that is a power equipment scheduled to be shut down in the power equipment shutdown plan,
2. The power system switching support device according to claim 1, wherein, when the target power equipment is shut down in the power equipment shutdown plan, the switching support means outputs, as the support information, information in which a plurality of switching patterns corresponding to the target power equipment are rearranged based on a transmission loss, an up-front constraint amount, and/or a renewable energy power source control amount. The calculation means further calculates a degree of grid congestion with respect to an operation capacity of the power distribution facility for each of the switching patterns,
The power system transfer support device according to claim 1 , wherein the transfer support unit displays the support information including the system congestion degree. The calculation means further has a function of calculating a power flow in the power system,
The calculation means is
Calculating a first power flow, which is a power flow when the power system is switched to a configuration of the switching pattern, and a second power flow when the power system is not switched to a configuration of the switching pattern;
Calculating a transmission loss, an increase margin constraint amount, and/or a renewable energy power source control amount in the first power flow, and a transmission loss, an increase margin constraint amount, and/or a renewable energy power source control amount in the second power flow;
2. The power system switching support device according to claim 1, wherein the switching support means outputs, as the support information, information sorted based on the transmission loss, the up-front constraint amount, and/or the renewable energy power source control amount in the first power flow and the transmission loss, the up-front constraint amount, and/or the renewable energy power source control amount in the second power flow. The calculation means is
Based on the power supply and demand at each substation in the power supply area and the connection status of the transmission lines connecting to each substation, the power flow in the power supply area is calculated.
5. The power system switching support device according to claim 4, wherein when calculating the power supply and demand of the substation, the power generation amount of the substation is calculated based on meteorological information for a mesh in which the substation is located and a renewable energy power source under the jurisdiction of the substation, and the power consumption of the substation is calculated based on a past record of the power consumption of the substation, thereby calculating the power supply and demand of the substation. The calculation means calculates, for each of the switching patterns, the transmission loss, the up-front constraint amount, and/or the renewable energy power source control amount at a plurality of times during a stoppage time during which the target power equipment is stopped;
3. The power system switching support device according to claim 2, wherein when the switching pattern is selected, the switching support means outputs the support information including information on a transmission loss, an up-consumption limit amount, and/or a renewable energy power source control amount at a plurality of times during the stop time in the switching pattern. The calculation means also calculates, for each switching pattern, the transmission loss, the up-consumption limit amount, and/or the renewable energy power source control amount during a stop operation time for stopping the target power equipment and a restoration operation time for restoring the target power equipment;
7. The power system switching support device according to claim 6, wherein when the switching pattern is selected, the switching support means outputs information on the transmission loss, the up-consumption limit amount, and/or the renewable energy power source control amount during the stop operation time or the restoration operation time in the switching pattern, including the information in the support information. The power system switching support device according to claim 1, wherein the switching support means, when multiple power equipment shutdown plans are executed at the same time, calculates the transmission loss, the increase margin constraint amount, and/or the renewable energy power source control amount for each switching pattern of each power equipment shutdown plan, totals the calculated transmission loss, the increase margin constraint amount, and/or the renewable energy power source control amount for each combination of multiple switching patterns of the multiple power equipment shutdown plans, and rearranges the switching patterns of each power equipment shutdown plan based on the total transmission loss, the increase margin constraint amount, and/or the renewable energy power source control amount. The power system switching support device according to claim 1, wherein, when the range of the power system changes depending on the switching pattern, the switching support means displays, as the support information, information in which the switching patterns are rearranged based on the transmission loss, the up-consumption limit amount, and/or the renewable energy source control amount in the same range for the multiple switching patterns. The switching support means includes:
Outputting information in which the switching patterns are rearranged based on a difference between a transmission loss, a renewable energy power source control amount, and/or an increase margin constraint amount in the switching patterns and a predetermined reference transmission loss, an increase margin constraint amount, and/or a renewable energy power source control amount, as the support information, or
2. The power system switching support device according to claim 1, wherein information in which the switching patterns are rearranged based on a total value of each of a transmission loss, a renewable energy power source control amount, and/or an increase margin constraint amount at a plurality of times within a stop time during which a power equipment scheduled to be stopped in a power equipment stop plan is stopped, a stop operation time for stopping the power equipment, and a restoration operation time for restoring the power equipment, is output as the support information. The power system further includes a configuration change means for adding a new component to the power system or deleting an existing component,
The power system switching support device according to claim 1 , wherein the calculation means calculates a transmission loss, an increase margin constraint amount, and a renewable energy power source control amount in a configuration of the power system changed by the configuration change means. A power system switching support system for supporting a power system switching operation, comprising:
A database that stores a plurality of switchable configuration patterns of the power system as switching patterns;
A computing device,
The computing device includes:
A calculation means for calculating, for each of the switching patterns, a transmission loss in a power distribution facility constituting a power system, an increase margin constraint amount that suppresses the output of a regulating power source, and/or a renewable energy power source control amount that suppresses the output of a renewable energy power source when the switching pattern is set;
and a switching support means for outputting, as support information, information indicating the plurality of switching patterns, the plurality of switching patterns being rearranged based on a transmission loss, an up-front constraint amount, and/or a renewable energy power source control amount calculated by the calculation means. A power system switching method for performing power system switching, comprising:
A plurality of switchable configuration patterns of the power system are stored as switching patterns;
For each of the switching patterns, a transmission loss in a power distribution facility constituting a power system, an increase limit constraint amount that suppresses the output of a regulating power source, and/or a renewable energy power source control amount that suppresses the output of a renewable energy power source are calculated when the switching pattern is set;
The power system switching method includes rearranging information indicating the plurality of switching patterns based on a transmission loss, an increase margin constraint amount, and/or a renewable energy power source control amount calculated for the plurality of switching patterns.