JP7117011B2 - Power supply method and power supply system realizing the same - Google Patents

Description

The present invention relates to a power supply method and a power supply system that implements the method.

In general, equipment at consumers such as factories, railways, commercial facilities, and homes (hereinafter referred to as "customer equipment") operates by receiving electric power supply. It is realized by being connected by transmission lines via substations, transformers, and the like. In general, the power supply network is described in, for example, Non-Patent Document 1 below.

In addition, Non-Patent Document 2 below discloses a technology that enables power to be used even during power outages by providing a solar panel in consumer equipment such as general households.

http://www.enecho.meti.go.jp/category/electricity_and_gas/electric/electricity_liberalization/supply/

https://taiyoseikatsu.com/faq/faq073.html

However, in the technique described in Non-Patent Document 1, the power from the power plant must be supplied to the customer equipment via the distribution substation and the pole transformer, and the power to the distribution substation etc. There is a problem that the supply of electric power becomes difficult when the route is cut off due to an earthquake or the like.

In addition, the technique described in Non-Patent Document 2 is a low-voltage one that is applied to small-scale consumer equipment such as general households, and it is not easy to apply it to equipment that requires a large amount of power. . In addition, since the power generated by this technology is DC power, an inverter (power conditioner) must be used to convert this DC power to AC once. As a result, a power supply system with two or more independent systems is constructed within the consumer equipment, and in the event of a power outage, the consumer equipment (load ) must be reconnected.

Therefore, in view of the above problems, it is an object of the present invention to provide a more reliable and easily configurable power supply method and a power supply system for realizing the method.

A power supply method according to one aspect of the present invention for solving the above problems is a power supply from a renewable energy power plant to a consumer facility that receives power supply from a distribution substation via a first transmission line. A power transmission line will also be installed, and power from the renewable energy power plant will be supplied to consumer equipment via a second transmission line.

In addition, a power supply system according to another aspect of the present invention includes consumer equipment that receives power supply from a distribution substation via a first transmission line, a renewable energy power plant, and a renewable energy power generation and a second transmission line for receiving power from a source.

As described above, according to the present invention, it is possible to provide a highly reliable power supply method that can be easily constructed and a power supply system for realizing the method.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the outline of a power supply network containing the power supply system which concerns on embodiment. It is a figure which shows the outline of the circuit in an example of consumer equipment in the electric power supply system which concerns on embodiment. 3 is a diagram for explaining the operation of the circuit in FIG. 2; FIG. FIG. 5 is a diagram schematically showing another example of a circuit in an example of consumer equipment in the power supply system according to the present embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the illustrative examples set forth in the embodiments set forth below.

FIG. 1 is a diagram schematically showing a power supply network S including a power supply system (hereinafter referred to as "this system") 1 according to this embodiment. In addition, this system 1 includes a consumer facility 2 that receives power supply from a distribution substation 3 via a first transmission line C1, a renewable energy power plant 4, a renewable energy power plant 4, and a consumer and a second transmission line C2 that connects the facility 2. As described above, the system 1 is included in the overall power supply network.

The overall power supply flow will now be described. First, electricity is generated by the first power plant PA. The type of the first power station PA is not limited, and is preferably a power station capable of large-scale output such as thermal power, hydraulic power, or nuclear power. may In general, the first power station PA outputs high-output power, voltage power of 500,000 V or 275,000 V, which is supplied to the extra-high voltage substation IA through the transmission line CA.

Here, the “transmission line” refers to a conductive line that can transmit power, as described above, and is generally a conductive metal core wire with an insulating coating. As shown in this figure, the transmission line is the first power station PA and substation, the substation and substation or transformer, the substation or transformer and customer equipment, or the power plant and customer equipment, etc. Connect each facility. In this specification, "first" and "second" are terms used to distinguish between connections between different facilities, and have no technical meaning per se. .

The power generated by the first power station PA and supplied to the EHV substation is then changed in voltage by the EHV substation IA. Specifically, the voltage is lowered to 154,000 V, and the electric power with this lowered voltage is sent to the primary substation IB via the transmission line CB.

Next, the primary substation IB, which receives the power supply from the ultra-high voltage substation IA, further lowers the voltage of the supplied power, and transfers power to the consumer facility DB, such as a railway or a large factory, which consumes a large amount of power. Supplied via CC. Specifically, the voltage is lowered to a range of 154,000 V to 66,000 V and supplied to the consumer equipment DB. Primary substation IB further supplies power to intermediate substation IC at a voltage of 154,000 V via transmission line CD.

Next, the intermediate substation IC further lowers the voltage of the power supplied from the primary substation IB, and supplies it to the consumer equipment DC through the transmission line CE, such as a factory with a relatively large power consumption, although not as large as the large factory mentioned above. to supply power. The voltage at this time is about 22,000V. The intermediate substation IC also lowers the voltage to about 22,000 V and supplies power to the distribution substation 3 through the transmission line CF, similarly to the above substations.

Next, the distribution substation 3 further lowers the power supplied from the intermediate substation IC, and supplies power to medium-scale power-consuming consumer facilities 2 such as medium-sized factories, buildings, hotels, and hospitals. do. The output voltage of this supplied power at the distribution substation 3 is 6600 V, and the power consumption of the consumer equipment 2 connected thereto is in the range of 50 kWh to 2000 kWh per hour. In addition, the distribution substation 3 further supplies power to the pole transformer ID via the transmission line CG.

Then, in the pole transformer ID, the voltage of the supplied power is converted to a household voltage of 100 V or 200 V, and supplied to the consumer equipment DD such as small factories and general households through the transmission line CH. . As a result, power can be stably supplied from the first power plant PA to small-scale consumer facilities DD such as households.

By the way, with the liberalization of electric power in recent years, unlike the first power station PA, the distribution substation 3 has a relatively small power station, specifically a renewable energy power station 4. It is possible to receive power supply. More specifically, it is possible to connect the renewable energy power plant 4 and the distribution substation 3 with a transmission line CI and send 6600 V power to the distribution substation 3 . Although the renewable energy power plant 4 cannot generate as much power as the first power plant PA, it has the advantage of being able to be constructed in a relatively small area.

Here, the renewable energy power plant 4 includes a hydroelectric power plant, a geothermal power plant, a solar power plant, a biomass power plant, a wind power plant, etc., and uses renewable energy that always exists in the natural world without relying on fossil fuels. based on which electrical energy can be generated. As for the types of renewable energy power plants 4, particularly in the case of hydroelectric power plants, even relatively small-scale rivers and waterways can be efficiently used as energy sources for power supply. It has the advantage of being easier to install than other power generation methods. In particular, in the case of a hydroelectric power station, there is also the advantage that alternating current power can be generated directly by rotating a water wheel or the like with the flow of water.

Further, in the present system 1, the renewable energy power plant 4 is capable of generating a voltage equal to the voltage of the power supplied by the distribution substation 3, as is clear from the above description. Also, since this power is generally alternating current, the same is true at this frequency. That is, it is preferable that the renewable energy power plant 4 includes control equipment for causing the consumer equipment 2 to supply power in the same manner as the distribution substation 3 .

As is clear from the above description, the “customer equipment” refers to equipment of a customer (electric power consumer) that can receive supply of electric power and consume the electric power. Consumer equipment includes mechanical equipment that consumes power, control equipment such as switchboards and distribution boards that are used to control, distribute, and supply power to mechanical equipment that consumes power, and electric wires that connect these devices. can be exemplified. Examples of specific consumer equipment include, but are not limited to, power equipment in railways, buildings, factories, hotels, hospitals, amusement parks, railways, and general households, as described above.

Further, as described above, the system 1 includes the consumer facility 2 that receives power supply from the distribution substation 3 via the first transmission line C1, the renewable energy power plant 4 that generates power, and the regeneration a second transmission line C2 for receiving power from the potential energy power plant 4; In this system 1, a renewable energy power plant 4 is provided, and electric power is directly supplied to medium-sized consumer facilities 2 that consume power, such as medium-sized factories, buildings, hotels, and hospitals, via a second transmission line C2. supply. Conventionally, there was no choice but to supply power to medium-sized consumer facilities via the distribution substation 3 or the pole-mounted transformer ID, but in this system, power can be sent directly to the medium-sized consumer facilities 2. can be done. In other words, even if it becomes difficult to supply power to the first power station PA and the substations connected to it due to disasters, etc., it is possible to supply power to consumer facilities. It becomes possible.

In addition, in the present system 1, the renewable energy power plant 4 is preferably installed within a distance of 2000 m from the consumer facility 2, more preferably 100 m or more and 2000 m or less, still more preferably 1500 m or less, Particularly preferably, it is 1000 m or less. Note that the “distance” here means the length of the transmission line, not the straight line distance between the renewable energy power plant 4 and the consumer equipment 2 . In this system 1 , by setting the distance within 2000 m, it is possible to preferentially use the power from the renewable energy power plant over the voltage from the distribution substation 3 . This principle includes an estimation part, but by arranging it closer to the consumer equipment 2, even if the output from the renewable energy power plant is the same 6600 V as the output from the distribution substation 3 , When the power reaches the consumer facility 2, there is a difference such as the voltage of the power from the renewable energy power plant increasing by about 1/10,000, and the output of the renewable energy power plant is prioritized. Conceivable.

By the way, FIG. 2 is a diagram showing an outline of the circuit of the switchboard 21, which is one of the consumer facilities 2 in the system 1. As shown in FIG. As shown in the figure, in this switchboard 21 , a first transmission line C 1 for supplying the output from the power distribution substation 3 is led in and connected to wiring 211 . The wiring 211 is connected to each of a plurality of mechanical devices A operating in the factory by wiring 212 via a switch S such as a breaker. In addition, the wiring 211 of the switchboard 21 of the system 1 is further connected to a second transmission line C2 for receiving power supply from the renewable energy power plant 4 . As a result, the switchboard 21 can obtain both power from the power distribution substation 3 and power from the renewable energy power plant 4 .

Before being connected to the wiring 211 of the switchboard 21, the first transmission line C1 is equipped with a first meter M1, and the second transmission line C2 is equipped with a second meter M2. . This makes it possible to check each output.

Here, the power distribution operation of the power distribution board 21 will be described with reference to FIG. First, in a normal state, that is, when power is stably supplied from both the distribution substation 3 and the renewable energy power plant 4 (a), the power from the renewable energy power plant 4 is automatically supplied according to the above principle. If there is a shortage, the shortage will be supplied as electric power from the distribution substation 3. If the power supply from the renewable energy power plant 4 is stopped, the machines in the factory are driven only by the power from the distribution substation 3 as in the conventional technology. In this figure, as an example, it is assumed that the consumer facility 2 requires power of 500 kW at a certain point in time (if this power is consumed for one hour, the power consumption will be 50 kWh. The relationship between "kW" and "kWh" is the same). On the other hand, 200 kW of power is supplied from the renewable energy power plant 4, and 300 kW of power is supplied from the distribution substation 3 (maximum supply is 500 kW).

On the other hand, in the observation by the first meter M1 and the second meter M2, the power supply from the distribution substation 3 is stopped or the amount of power supply is reduced, and the renewable energy power plant 4 and the distribution substation If it is determined that the amount of power supplied from the plant 3 is not enough to sufficiently drive the machinery A in the factory, the renewable energy power plant 4 will continue to supply a certain amount of power for a certain period of time. After that, the switch S is controlled, specifically turned off, so that the power consumed by the consumer facility 2 is less than or equal to the power that can be supplied (b). More specifically, the power consumption of consumer equipment such as mechanical devices in a factory connected to each of the plurality of switches S is recorded in advance, and the total number of these can be supplied by the renewable energy power plant 4. The switch S is turned off so that the range of electric energy is obtained. Furthermore, in this case, it is preferable to set a priority order for each of the plurality of consumer equipment to be connected, and to disconnect the equipment from the lowest priority based on this priority until the amount of electric power that can be supplied is less than or equal to the amount of power that can be supplied. . By doing so, it is possible to prevent equipment from being damaged due to a sudden power supply stoppage. In this case, the "fixed period of time" is preferably a period of time that is sufficient to control the amount of power supplied to the factory and is within a range that does not damage the equipment and machinery of the factory, for example, 60 seconds or more and 600 minutes. It is preferably 300 seconds or less, more preferably 200 seconds or less. In addition, the "constant power" may be the amount of power normally supplied by the renewable energy power plant 4, but it is also possible to urgently increase the power amount in the range of 5% to 50% of the normal time. Well, more preferably 20% or less. By doing so, it is possible to suppress the influence of a decrease in the amount of power to be supplied. In particular, there is a case where the power for driving the factory can be covered by increasing the amount of power, and in that case, the influence of the decrease in the amount of power from the distribution substation 3 can be almost ignored. become. In this case, the fixed time limit may not be imposed as long as the problem of the burden on the renewable energy power plant 4 is too small. It is possible. As for this configuration, a control device having an electronic circuit connected to the meters M1, M2 and the switch S may be used to achieve the above functions. The functions described above may be achieved by connecting to a monitoring server through a telecommunication line such as the above, and processing by the monitoring server.

In the above case, that is, when the power supply from the power distribution substation 3 is stopped or the amount of power supplied is reduced, it is conceivable that some sort of failure has occurred in the power supply network. In this state, if the power from the renewable energy power plant 4 flows backward to the distribution substation 3, there is a risk of causing some problem in the network. In order to prevent this, it is preferable to provide a backflow prevention device R in the vicinity of the first meter M1. By doing so, the above problem can be solved. However, even if there is no problem with the power supply network itself, if more power is supplied than the power consumption of the consumer equipment 2, this The function of the backflow prevention device R may be stopped. As for this backflow prevention device R, it is also preferable to provide a similar backflow prevention device R near the second meter M2 so that power does not flow back to the renewable energy power plant 4 side, as described above. This image is shown in FIG.

The construction of this system 1 can be carried out by a general power transmission and distribution business operator, but can also be carried out by a specific power transmission and distribution business operator. A general power transmission and distribution business operator is an electric power business operator that has been licensed by the Minister of Economy, Trade and Industry pursuant to the provisions of Article 3 of the Electricity Business Act. A business operator that has submitted a notification to the Minister.

As described above, according to the present embodiment, it is possible to provide a power supply method and a power supply system for realizing the method, which is more reliable and can be easily constructed.

INDUSTRIAL APPLICABILITY The present invention has industrial applicability as a power supply method and a power supply system.

Claims (6)

power line For consumer equipment that receives power supply from distribution substations viaHydroelectric power plantfromalso said transmission linefacility and saidHydroelectric power plantpower fromsaid transmission lineA power supply method for supplying power to the consumer equipment via
The hydroelectric power plant and the distribution substation each include control equipment for causing the consumer equipment to perform similar power supply,
The output voltage of the distribution substation and the hydroelectric power plant is 6600 V and the frequencies are equal,
SaidHydroelectric power plantto said consumer equipmentsaid transmission lineThe length of the distribution substation and the consumer equipmentsaid transmission linearranged to be shorter than the length of
for power distributionsubstationpower supply andHydroelectric power plantIf the total power supply amount of the power supply can stably supply the total power consumption of the multiple machines in the customer facility, the aboveHydroelectric power plantgiving priority to the power supply from the distribution substation over the power supply from the distribution substation,
The amount of power supplied from the distribution substation and theHydroelectric power plantIf the total power consumption of the plurality of mechanical devices in the consumer facility is not reached even if the total amount of power supplied from the The total power consumption of the machinery to be driven is the power supply from the distribution substation and theHydroelectric power plantA power supply method in which the total amount of power supplied from the 2. The power supply method according to claim 1 , wherein the length of said power transmission line from said hydroelectric power plant to said consumer facility is 2000 m or less. recording the power consumption and priority of each of the plurality of mechanical devices;
2. The power supply method according to claim 1, wherein the plurality of switches are sequentially turned off according to the order of priority. power line a plurality of consumer facilities that receive power supply from a distribution substation via
Hydroelectric power plant When,
SaidHydroelectric power plantfor receiving power fromsaid transmission lineand a power supply system comprising
The hydroelectric power plant and the distribution substation each include control equipment for causing the consumer equipment to perform similar power supply,
The output voltage of the distribution substation and the hydroelectric power plant is 6600 V,
SaidHydroelectric power plantto said consumer equipmentsaid transmission linebetween the distribution substation and the consumer equipmentsaid transmission linearranged to be shorter than the length of
A switchboard having a plurality of switches connected to the plurality of consumer facilities,
The switchboard is
for power distributionsubstationpower supply andHydroelectric power plantIf the total power supply of the power supply can stably supply the total power consumption of the plurality of mechanical devices in the consumer equipment,Hydroelectric power plantgiving priority to the power supply from the distribution substation over the power supply from the distribution substation,
The amount of power supplied from the distribution substation and theHydroelectric power plantWhen the total power consumption of the plurality of mechanical devices in the customer facility is not reached even if the total amount of power supplied from The total power consumption of the device is the power supply from the distribution substation and theHydroelectric power plantA power supply system that does not exceed the total amount of power that can be supplied from the length of the transmission line from the hydroelectric power plant to the consumer facility; is less than or equal to 2000mClaim 4A power supply system as described. The switchboard is
recording the power consumption and priority of each of the plurality of consumer equipment;
5. The power supply system according to claim 4 , wherein the plurality of switches are sequentially turned off in accordance with the order of priority.

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