JP2007295717A - Power supply control system and power supply control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply control system that properly performs feeding control for charging an object to be charged such as an electric vehicle according to power consumption. <P>SOLUTION: This power supply control system is provided with a charging device 3 that charges the electric vehicle 7, and a host computer 2 that determines a charge start time that the charging device 3 starts charging. The host computer 2 makes a load curve of expected power consumption according to the lapse of time and, when receiving a query from the charging device 3, the charge start time of the electric vehicle 7 is determined and notified to the charging device 3 in the time slot when power demand shown by the load curve is low. The charging device 3 starts charging the electric vehicle 7 when the charge start time received from the host computer 2 comes. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric supply control system and an electric supply control method for controlling power supply to an electric water heater or an electric vehicle.

  Control of power supply to the electric water heater usually sets a power supply time in advance using a timer installed on the consumer side. As a result, power can be supplied at a time when the electricity rate is cheaper, such as late-night electricity, on the consumer side, and the load can be leveled by using electricity at night on the power company side.

On the other hand, in the case of an electric vehicle, since it is often used in the daytime, a charging plan device that creates a charging plan for each charger, for example, for a charging facility such as a parking lot where a large number of chargers are installed There is. In this case, a time zone in which charging is performed by the charger, and a power load condition desired by a person using the power facility when charging in this time zone are input to the charging planning apparatus. As the power load condition input at this time, for example, the power load is set to be high during a time period when the electricity rate is low, and is set to be low otherwise. The charging plan apparatus creates a charging plan based on the input information. As a result, when the power load condition is input so that the electric vehicle is charged at night, it is possible to use the late-night power and level the load (see, for example, Patent Document 1).
JP 2000-209707 A

  However, there are the following problems in the power supply in the time zone where the electricity rate is low, such as the late-night power mentioned above. In the case of an electric water heater, electric power is supplied to the electric water heater during the power supply time set in the timer. For this reason, for example, even in the case of a tropical night in the summer, unless the user of the electric water heater changes the set time, the electric water heater and the cooling device are used in combination, resulting in a rapid increase in power consumption and load leveling. become unable.

  In the case of an electric vehicle, the charging plan device creates a charging plan for each charger according to the input power load condition and the like. For this reason, as in the case of electric water heaters, for example, when power consumption increases suddenly, such as during a tropical night in the summer, the rapid increase in power consumption can be resolved by adjusting the charging sequence of each charger. It becomes impossible to level load.

  An object of the present invention is to provide an electric supply control system that solves the above-described problems and makes it possible to appropriately perform power supply control for charging an object to be charged such as an electric vehicle according to power consumption. It is in.

  In order to solve the above-mentioned problem, the invention of claim 1 is an electric supply control system including a charging device that charges an object to be charged and a control device that determines a charging start time at which the charging device starts charging. The control device creates a load curve that predicts power consumption according to the passage of time, and upon receiving an inquiry from the charging device, charges the object to be charged in a time zone when the power demand represented by the load curve is low. The electric supply control system is characterized in that a charging start time is determined and notified to the charging device, and the charging device starts charging the object to be charged when the charging start time received from the control device is reached.

  According to the first aspect of the present invention, the electricity supply control system includes a charging device that charges an object to be charged, and a control device that determines a charging start time at which the charging device starts charging. Further, the control device creates in advance a load curve that predicts power consumption according to the passage of time. In such a state, when the charging device makes an inquiry to the control device about the charging start time at which charging starts, the control device determines the charging start time of the object to be charged and sends it to the charging device in a time zone when the power demand represented by the load curve is low. Notice. The charging device starts charging the object to be charged when the charging start time received from the control device is reached.

  According to a second aspect of the present invention, in the electrical supply control system according to the first aspect, the control device creates the load curve based on the power supplied to the distribution line by the transformer of the distribution substation. Features.

  According to a third aspect of the present invention, in the electric power supply control system according to the first aspect, the control device creates the load curve based on electric power sent from a distribution line of a distribution substation.

  According to a fourth aspect of the present invention, in the electric power supply control system according to the first aspect, the control device creates the load curve based on the electric power that the pole transformer provided in the distribution line sends to the consumer. It is characterized by doing.

  According to a fifth aspect of the present invention, in the electrical supply control system according to any one of the first to fourth aspects, the control device corrects the load curve based on weather data including weather, temperature, humidity, and wind speed. It is characterized by that.

  A sixth aspect of the present invention is the electricity supply control system according to any one of the first to fifth aspects, wherein the control device uses the charging start time so as to use a time zone in which an electricity bill is set at a low price. It is characterized by determining.

  The invention according to claim 7 is an electric supply control method using a charging device for charging an object to be charged, creating a load curve that predicts power consumption over time and receiving an inquiry from the charging device. Then, when the power demand represented by the load curve is low, the charging start time of the object to be charged is determined and notified to the charging device, and when the charging start time is reached, the charging device charges the object to be charged. It is an electric supply control method characterized by starting.

  According to the inventions of claim 1 and claim 7, in order to investigate the start time for charging an object such as an electric vehicle to start charging using the load curve on the charging day, power supply according to the predicted power demand It is possible to appropriately perform control, that is, to level the load.

  According to the second aspect of the present invention, the load curve is created based on the power supplied from the transformer of the distribution substation to the distribution line, so that load leveling based on the transformer of the substation is made possible. According to the invention of claim 3, since the load curve is created based on the power sent by the distribution line of the distribution substation, load leveling based on the distribution line of the substation is made possible. According to the invention of claim 4, since the load curve is created based on the electric power that the pole transformer provided in the distribution line sends to the consumer, load leveling based on each pole transformer is enabled. To do.

  According to the fifth aspect of the present invention, the load curve is corrected based on weather data including weather, temperature, humidity, and wind speed. Therefore, the power demand on the charging day is reliably predicted, and load leveling adapted to the day is enabled.

  According to the invention of claim 6, since the charging start time is determined so as to use a time zone in which the electricity rate is set low, load leveling can be performed and the electricity rate of the consumer can be kept low.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
An electric supply control system according to this embodiment is shown in FIG. This electric supply control system includes a monitoring device 1A installed in a substation 1 for power distribution, a host computer 2, a charging device 3, and a communication network 4.

The substation 1 sends the high voltage from the transformer ₁₁ to the distribution lines 5A to 5C, respectively. In substation 1, the high voltage sent from the substation higher applied to the transformer 1 _1, the current flowing through the transformer 1 _1, the supply power supplied to the distribution line 5A~5C from the transformer 1 _1, distribution line 5A The monitoring apparatus 1 </ b> A monitors the power supplied by ˜5C. The monitoring device 1 </ b> A transmits a monitoring result to the host computer 2 via the communication network 4 in response to a transmission request from the host computer 2.

  The communication network 4 mainly transmits data, and there are a communication network 4 that enables data transmission using a telephone line, a wireless network that enables data transmission, and the like.

  A high voltage sent from the substation 1 to the distribution lines 5A to 5C, for example, a high voltage sent to the distribution line 5A, is converted into a low voltage by the pole transformers 5D and 5E and supplied to a large number of customers. The For example, the low voltage from the pole transformers 5D and 5E is sent to the consumer 6A possessing the charging device 3 or the general consumer 6B. The charging device 3 supplies power to the electric vehicle. As shown in FIG. 2, the charging unit 3A includes a conversion unit 3A, a communication unit 3B, a charging unit 3C, a processing unit 3D, a measuring unit 3E, an input unit 3F, and a display unit 3G. I have.

The conversion unit 3A of the charging device 3 converts the AC low voltage AC that has been stepped down by the pole transformer 5D into a DC voltage. The charging unit 3C receives the DC voltage from the conversion unit 3A and applies a charging voltage to the cable 3A ₁ connected to the electric vehicle 7 under the control of the processing unit 3D. When the cable 3A ₁ is connected to the electric vehicle 7, the measuring unit 3E measures the voltage, internal resistance, etc. of the battery (not shown) of the electric vehicle 7 under the control of the processing unit 3D, and the measurement result is processed by the processing unit Send to 3D.

The input unit 3F is operated by a driver of the electric vehicle 7 or the like. The input unit 3F, for example, charge ready or indicating that the preparation for charging and connecting cables 3A ₁ is completed in the electric vehicle 7, and charging end time the driver of the electric vehicle 7 is desired is input. The input unit 3F sends the input data to the processing unit 3D. The display unit 3G displays data and the like input to the input unit 3F under the control of the processing unit 3D. The communication unit 3B transmits and receives data to and from the host computer 2 via the communication network 4 under the control of the processing unit 3D.

  The processing unit 3D performs control related to charging of the charging device 3. For example, when the processing unit 3D receives an instruction to complete charging preparation from the input unit 3F, the processing unit 3D controls the measurement unit 3E to instruct measurement of the battery voltage, internal resistance, and the like of the electric vehicle 7. Thereafter, when the processing unit 3D receives the measurement result from the measurement unit 3E, the processing unit 3D estimates a charging time until the battery reaches a predetermined voltage by charging and a charging power necessary for the charging. The predetermined voltage is the voltage of the battery when the battery is fully charged. When the processing unit 3D estimates the charging time and the charging power, the processing unit 3D controls the communication unit 3B to send the charging power, the charging time, the charging end time, and the contract number of the customer 6A to the host computer 2 and the electric vehicle 7 The host computer 2 is inquired about the charging start time. Thereafter, the processing unit 3D receives the charging start time from the host computer 2, and at this charging start time, controls the charging unit 3C to charge with the charging current calculated from the charging power, and charges the electric vehicle 7 To start. Thereafter, when the charging time elapses and the battery of the electric vehicle 7 is fully charged, the processing unit 3D ends the charging of the electric vehicle 7.

  The host computer 2 is a central computer for processing and controlling data for power supply, and is installed in an electric power company. As shown in FIG. 3, the host computer 2 includes a communication unit 2A, a processing unit 2B, a storage unit 2C, an input unit 2D, and a display unit 2E.

  The communication unit 2A of the host computer 2 transmits / receives data to / from the monitoring device 1A and the charging device 3 of the substation 1 via the communication network 4 under the control of the processing unit 2B. The input unit 2D is operated by a power company staff. The weather data that has changed when the weather, temperature, humidity, wind speed, and the like of the day on which electricity supply control is performed has changed significantly is input to the input unit 2D. The display unit 2E displays various data under the control of the host computer 2b, for example, a load prediction curve representing the power demand on the day predicted by the processing unit 2B. The storage unit 2C stores the processing procedure and various data of the processing unit 2B.

The processing unit 2B performs a process for controlling the supply of electricity. For this purpose, the processing unit 2B performs a load curve creation process and an electric supply control process. In load curve creation processing, the processing unit 2B requests to transmit for example the data representing the power supplied transformer 1 ₁ substation 1. The processing unit 2B sends a transmission request for this purpose to the monitoring device 1A of the substation 1 via the communication unit 2A. Thereafter, the processing section 2B periodically receive data transformer 1 ₁ substation 1 represents the power supplied from the monitoring device 1A, the power consumed is customer from the data time, the substation Check with reference to ₁ transformer 1 ₁ . Thus, the processing unit 2B is a load curve representing the power consumer has consumed over time, the transformer 1 ₁ to create a load curve representing the power supplied. The processing unit 2B creates a daily load curve and accumulates, for example, a load curve for one year in the storage unit 2C.

  The processing unit 2B creates a load curve for the day on which electricity supply control is performed by a load curve creation process. The processing unit 2B predicts the load curve of the day in order to predict the power demand of the day. For this purpose, the processing unit 2B reads the load curve of the same period of the previous year from the storage unit 2C. Since the load curve fluctuates depending on the weather, temperature, humidity, wind speed, etc., the processing unit 2B receives various data including weather data such as the weather, temperature, humidity, wind speed of the day received from the communication unit 2A or the input unit 2D. Is used to correct the load curve read from the storage unit 2C to obtain the load curve of the day.

The following flow is an example of the load curve creation process.
A1. Assume a load curve at night on the day.
A2. A load curve result is created based on the charging time and charging current of an electric vehicle or the like assigned to the load curve.
A3. The charging time and the charging current are sequentially determined according to the charging capacity of the electric vehicle or the like set in the charging device 3 so as to achieve load leveling while repeating the above A2.
A4. The load curve results are created simultaneously with the above A3.

On the other hand, the processing unit 3D assumes a night-time load curve on the day in consideration of the following conditions.
a1. Load curve of the day (in-house hydropower, thermal power, nuclear power generation output, tidal currents with each power company)
a2. Load curve of the same day of the same period of the previous year (load curve excluding loads that use nighttime electricity such as electric water heaters, electric vehicles, NaS batteries)
a3. The weather, temperature, humidity, wind speed, etc. of the day, etc. The a2 NaS battery is a sodium / sulfur battery, which is a fuel cell that is utilized for load leveling of electric power.

  In this way, the processing unit 2B creates a load curve for the day.

Thereafter, the processing unit 2B performs an electric supply control process using the load curve of the day. When the processing unit 2B receives the charging power, charging time, charging end time, and contract number of the electric vehicle 7 and an inquiry about the charging start time of the electric vehicle 7 from the charging device 3 via the communication unit 2A, The charging start time of the electric vehicle 7 is determined from the charging power, the charging time, the power end time, and the load curve of the day. At this time, the processing unit 2B uses the load curve of the day so that the power supplied to the load by the transformer 11 of the substation ₁ is the same day and night, that is, the day and night power consumption is the same. Allocate power to For example, when the load curve of the day changes as shown in FIG. 4, when an inquiry about the charging start time is received from the charging device 3 at 16:00, the charging time is 5 hours, and the charging end time is 7 o'clock the next day The charging start time is determined at 20:00 in consideration of the charging power. 20:00 is the time T2 when the power consumption of the day is lower than the peak time T1. Furthermore, when it is found from the contract number that the customer 6A is a contractor of cheap electricity use such as late-night power, the charging start time is set in, for example, a late-night power time zone in consideration of this. The processing unit 2B sends the charging start time determined in this way to the charging device 3 via the communication unit 2A.

  Next, an electric supply control method according to this embodiment will be described. As shown in FIG. 5, in the host computer 2, the driver operates the charging device 3 and inputs a charging end time and the like. Thereby, the charging device 3 estimates the charging time of the electric vehicle 7 and the charging power necessary for charging, and thereafter inquires the host computer 2 about the charging start time.

  When the host computer 2 receives the charging power, charging time, charging end time, and contract number from the charging device 3 and receives an inquiry about the charging start time, the host computer 2 performs an electric supply control process using the load curve of the day, The charging start time of the car 7 is determined. The host computer 2 sends this charging start time to the communication network 4.

  The charging device 3 receives the charging start time from the host computer 2 via the communication network 4. Thereafter, when the charging start time comes, the charging device 3 starts charging the electric vehicle 7. When the charging time elapses and the battery of the electric vehicle 7 becomes fully charged, the charging device 3 finishes charging the electric vehicle 7.

According to this embodiment, it is possible to automatically allocate power consumption so that the power consumption is the same day and night. At this time, as the load curve of the host computer 2 the day, since using the load curve prepared based on the supply power of the transformer 1 ₁ substation 1, the load relative to the transformer 1 ₁ substation 1 Leveling Make it possible.

(Embodiment 2)
In this embodiment, the storage unit 2C of the host computer 2 of the first embodiment is stored in advance and consumer information 2C ₂ shown in distribution line information 2C ₁ and 7 shown in FIG. Distribution line information 2C ₁ is data representing a pole transformer installed in distribution lines 5A to 5C.
Distribution line 5A: A line
Distribution line 5B: B line
Distribution line 5C: C line
Pillar transformer 5D: A001
Pillar transformer 5E: A002
Then, it is data indicating that the pole transformer 5D having the identification information “A001” and the pole transformer 5D having the identification information “A002” are installed on the distribution line 5A of the “A line”. The pole transformers installed in the “B line” distribution line 5B and the “C line” distribution line 5C are also recorded in the distribution line information 2C ₁ .

The customer information 2C ₂ is data representing a customer to whom electric power is supplied from each pole transformer. For example, “01234” is recorded as the “contract number” of the consumer 6A receiving the power supply from the pole transformer 5D with the identification information “A001”, and the illustration is omitted in FIG. Data including “name”, “address”, “phone number”, and “contract contents” of 6A is recorded.

  In this embodiment, the processing unit 2B of the host computer 2 performs the load curve creation process of the first embodiment as follows. The processing unit 2B requests to transmit data representing the power supplied by the distribution lines 5A to 5C of the substation 1 respectively. The processing unit 2B sends a transmission request for this purpose to the monitoring device 1A of the substation 1 via the communication unit 2A. After this, the processing unit 2B periodically receives data representing the power transmitted by the distribution lines 5A to 5C of the substation 1 from the monitoring device 1A, and the power consumed by the consumer from these data over time, Each of the distribution lines 5A to 5C is examined as a reference. Thereby, the process part 2B is a load curve which represents the electric power which the consumer consumed by time passage, Comprising: The load curve showing the electric power which the distribution lines 5A-5C each sent is produced. The processing unit 2B creates daily load curves for the distribution lines 5A to 5C, and accumulates, for example, a load curve for one year in the storage unit 2C.

Thereafter, the processing unit 2B performs a load curve creation process in the same manner as in the first embodiment, and performs an electric supply control process using the created load curve of the day. That is, the processing unit 2B sends the charging power, charging time, and charging end time of the electric vehicle 7, a contract number, and an inquiry about the charging start time of the electric vehicle 7 from the charging device 3 via the communication unit 2A. when received, by referring to the customer information 2C ₂ of the storage unit 2C, consumers 6A of the received contract number to find the identity of the pole transformer supplied with power. Furthermore, the distribution line to which the pole transformer of this identification information is connected is specified with reference to the distribution line information 2C ₁ of the storage unit 2C from the retrieved identification information of the pole transformer. And the load curve corresponding to the specified distribution line is used. Thereafter, as in the first embodiment, the charging start time of the electric vehicle 7 is determined from the charging power, the charging time, the charging end time and the load curve of the day, and this charging is performed via the communication unit 2A. The start time is sent to the charging device 3.

  According to this embodiment, it is possible to automatically allocate power consumption so that the power consumption is the same day and night. At this time, since the host computer 2 uses a load curve created based on the power sent from the distribution lines 5A to 5C as the load curve of the day, load leveling based on the distribution lines 5A to 5C of the substation 1 is performed. enable.

(Embodiment 3)
In this embodiment, the monitoring device 1A of the substation 1 monitors the power sent from each pole transformer to each customer. For this reason, in this embodiment, the monitoring apparatus which monitors the electric power sent to a consumer from a pole transformer is installed. In the example of the first embodiment, as shown in FIG. 8, monitoring devices 5D ₁ and 5E ₁ are installed in pole transformers 5D and 5E. In this embodiment, the storage unit 2C of the host computer 2 stores customer information 2C ₂ similar to that of the second embodiment in advance.

  In this embodiment, the processing unit 2B of the host computer 2 performs the load curve creation process of the first embodiment as follows. The processing unit 2B requests to transmit data representing the power transmitted by each pole transformer monitored by the monitoring device 1A of the substation 1. The processing unit 2B sends a transmission request for this purpose to the monitoring device 1A of the substation 1 via the communication unit 2A. The processing unit 2B periodically receives data representing the power sent by each pole transformer including the pole transformers 5D and 5E from the monitoring device 1A, and uses the power consumed by the consumer from these data over time. Investigate based on each pole transformer. As a result, the processing unit 2B creates a load curve representing the power consumed by the consumer over time and representing the power sent to each pole transformer. The processing unit 2B creates a daily load curve for each pole transformer, and stores, for example, a load curve for one year in the storage unit 2C in association with the identification information of each pole transformer.

Thereafter, the processing unit 2B performs the electric supply control process using each load curve on the day on which the load curve creation process is performed as in the first embodiment. That is, the processing unit 2B sends the charging power, charging time, and charging end time of the electric vehicle 7, a contract number, and an inquiry about the charging start time of the electric vehicle 7 from the charging device 3 via the communication unit 2A. when received, by referring to the customer information 2C ₂ of the storage unit 2C, consumers 6A of the received contract number to find the identity of the pole transformer to receive power supply. Then, the processing unit 2B uses a load curve corresponding to the identified identification information. Thereafter, as in the first embodiment, the charging start time of the electric vehicle 7 is determined from the charging power, the charging time, the charging end time and the load curve of the day, and this charging is performed via the communication unit 2A. The start time is sent to the charging device 3.

  According to this embodiment, it is possible to automatically allocate power consumption so that the power consumption is the same day and night. At this time, since the host computer 2 uses a load curve created based on the power sent by each pole transformer as the load curve of the day, load leveling based on the pole transformer is enabled.

  As described above, the first to third embodiments of the present invention have been described in detail. However, the specific configuration is not limited to these embodiments, and there are design changes and the like without departing from the scope of the present invention. However, it is included in this invention. For example, in each embodiment, charging to the electric vehicle 7 is taken as an example, but the present invention can be applied to various objects to be charged such as an electric water heater. In each of the embodiments, the present invention is mainly applied to the distribution substation 1. However, the present invention can also be applied to load leveling based on a higher-order substation such as a primary substation or a power plant. is there.

It is explanatory drawing of the electric supply control system by Embodiment 1 of this invention. It is a block diagram which shows the structure of a charging device. It is a block diagram which shows the structure of a host computer. It is a figure which shows an example of a load curve. It is a figure explaining the electric supply control method by Embodiment 1. FIG. It is a figure which shows an example of the distribution line information by Embodiment 2. It is a figure which shows an example of the customer information by Embodiment 2. FIG. 10 is an explanatory diagram of an electricity supply control system according to a third embodiment.

Explanation of symbols

1 Power distribution substation 1 ₁ Transformer 2 Host computer (control device)
2A communication unit 2B processing unit 2C storage unit 2C ₁ distribution line information 2C ₂ customer information 2D input unit 2E display unit 3 charging device 3A conversion unit 3B communication unit 3C charging unit 3C ₁ cable 3D processing unit 3E measurement unit 3F input unit 3G display unit 4 network 5A~5C distribution lines 5D, 5E pole transformer 5D _1, 5E ₁ monitor 6A, 6B customers 7 electric vehicle (to be charged object)

Claims (7)

An electric supply control system comprising: a charging device that charges an object to be charged; and a control device that determines a charging start time at which the charging device starts charging,
The control device creates a load curve that predicts power consumption over time, and upon receiving an inquiry from the charging device, starts charging the object to be charged at a time when the power demand represented by the load curve is low Determine the time and notify the charging device,
The charging device starts charging the object to be charged at a charging start time received from the control device;
Electric supply control system characterized by   The said control apparatus produces the said load curve based on the electric power which the transformer of a distribution substation supplies to a distribution line, The electric supply control system of Claim 1 characterized by the above-mentioned.   The said control apparatus produces the said load curve based on the electric power which the distribution line of a distribution substation sends, The electric supply control system of Claim 1 characterized by the above-mentioned.   The said control apparatus produces the said load curve based on the electric power which the pole transformer provided in the distribution line sends to a consumer, The electric supply control system of Claim 1 characterized by the above-mentioned.   The power supply control system according to any one of claims 1 to 4, wherein the control device corrects the load curve based on weather data including weather, temperature, humidity, and wind speed.   The said control apparatus determines the said charge start time so that the time zone in which the electricity bill is set cheaply may be used, The electric supply control system of any one of Claims 1-5 characterized by the above-mentioned. An electric supply control method using a charging device for charging an object to be charged,
Create a load curve that predicts power consumption over time,
When receiving an inquiry from the charging device, in a time zone when the power demand represented by the load curve is low, determine the charging start time of the object to be charged and notify the charging device,
When the charging start time comes, the charging device starts charging the object to be charged.
An electric supply control method.

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