JP2010011704A - System interconnection apparatus, system interconnection system, power transmission system and control apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system interconnection apparatus, a system interconnection system, a power transmission system and a control apparatus, capable of solving the problem of power shortage in a substation by utilizing reverse flow from a power supply unit equipped in each consumer. <P>SOLUTION: The system interconnection apparatus 100 connected to a power distribution system (bank) to which AC power is transmitted and a power supply unit 32 installed in a consumer 30 includes: a reception section 101 for receiving reverse flow information including an increase instruction to instruct an increase in reverse flow power transmitted from the power supply unit 32 to the power distribution system from a predetermined transmission channel; and a control section 104 for increasing the reverse flow power based on the reverse flow information. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a grid interconnection device, a grid interconnection system, a power transmission system, and a control device that are connected to a power distribution system through which AC power is transmitted and a power supply device provided in a consumer.

  In recent years, there is an increasing number of cases where a power supply device (for example, a solar power generation device, a fuel cell power generation device, etc.) is provided in each consumer (for example, a house, a factory, etc.) that receives supply of AC power from a substation. Specifically, a plurality of distribution systems (hereinafter referred to as banks) are provided under the substation, and each bank is provided with a consumer with a power supply device and a consumer without a power supply device. ing. Each bank and the power supply device are connected by a grid interconnection device.

  In addition, the power supplied from the power supply device is not only consumed by a power consuming device (for example, home appliances) provided in the consumer, but also transmitted to the bank side via the grid interconnection device (reverse power flow). Sometimes it is done.

  Here, for example, when the power consumption of the power consuming apparatus provided in each consumer reaches a peak as in the afternoon in summer, the power consumed by each consumer may exceed the power supplied from the substation. There is.

Thus, pumped hydroelectric power generation for the purpose of alleviating power shortage at such substations is known (see, for example, Non-Patent Document 1). Specifically, when there is a risk of power shortage at the substation, the substation is supplied with power by performing pumped hydropower generation using water pumped up by surplus power at night.
IEEJ Journal, Vol. 126, No. 4, 2006, P214-217 "Load leveling and power storage technology"

  However, in pumped hydropower generation, there is a limit to the amount of water that can be pumped at night, so power can be generated only for a few hours. In addition, in the pumped hydropower generation, a considerable amount of electric power is required to pump up water by the reverse rotation of the water turbine. Therefore, in addition to pumped hydropower generation, it is desired to secure a power source to alleviate power shortages at substations.

  Therefore, the present invention has been made to solve the above-described problems, and a system that can alleviate power shortages at substations by utilizing a reverse power flow from a power supply device provided in each consumer. It is an object of the present invention to provide an interconnection device, a grid interconnection system, a power transmission system, and a control device.

  One feature of the present invention is a grid interconnection that is connected to a power distribution system to which AC power is transmitted, a power supply apparatus, and a power consumption apparatus, and that transmits output power output from the power supply apparatus to the power consumption apparatus and the distribution system. A receiving unit that receives reverse flow information including an increase instruction for instructing an increase in reverse flow power transmitted from the power supply device to the distribution system, and a reverse flow based on the reverse flow information. And a control unit for increasing power.

  According to one aspect of the present invention, surplus power output by a power supply device provided to a consumer can be reversely flowed to a distribution system. Therefore, the power shortage can be alleviated by utilizing the reverse power flow from the power supply device.

In the above-described feature of the present invention, the control unit may increase the reverse power flow by increasing the output power of the power supply device.

  In the above-described feature of the present invention, the control unit may increase the reverse power flow power by decreasing the supply power supplied from the power supply device to the power consuming device.

  In the above-described feature of the present invention, the reverse power flow information includes type information that specifies a type of a power supply device that increases the reverse power flow, and the control unit is a power source in which a type specified by the type information is provided to a consumer. If the device type matches, the reverse flow power may be increased. In this case, the type information may specify a power supply device with stable output power.

  In the above-described feature of the present invention, the reverse power flow information includes regional information for specifying a region where the reverse power flow power is increased, and the control unit has a reverse power flow power when the region specified by the regional information is its own region. May be increased.

  In the above-described feature of the present invention, the reverse power flow information may include power information that specifies the magnitude of the reverse power flow, and the control unit may control the reverse power flow based on the power information.

  In the above-described feature of the present invention, the reverse power flow information includes a suppression instruction for instructing suppression of supply power supplied from the power supply apparatus to the power consuming apparatus, and the control unit suppresses supply power based on the suppression instruction. May be. Further, when the reverse power flow information includes power information that specifies the magnitude of the reverse power flow, the control unit may increase the reverse power flow to a level specified by the power information by suppressing the supplied power. Good.

  One feature of the present invention is that a power supply device is connected to a power distribution system to which AC power is transmitted, a power supply device, and a power consumption device, and output power output from the power supply device is transmitted to the power consumption device and the power distribution system. A grid interconnection system including a grid interconnection device configured to transmit reverse power flow information including an increase instruction instructing an increase in reverse power flow transmitted from the power supply device to the distribution system. A receiving unit that receives from the path, and a control unit that increases the reverse flow power based on the reverse flow information.

  One feature of the present invention is that a substation for transmitting AC power to a distribution system, a power supply device, a distribution system, a power supply device, and a power consumption device are connected to the output power output from the power supply device. And a grid interconnection device that transmits power to the distribution system, and the substation generates reverse power flow information including an increase instruction that instructs an increase in reverse power flow transmitted from the power supply device to the power distribution system A reverse power flow information generation unit, and a transmission unit that transmits reverse power flow information to a predetermined transmission path, the grid interconnection device, a reception unit that receives reverse power flow information including an increase instruction from a predetermined transmission path, And a controller that increases the reverse flow power based on the reverse flow information.

  One feature of the present invention is that a substation for transmitting AC power to a distribution system, a power supply device, a distribution system, a power supply device, and a power consumption device are connected to the output power output from the power supply device. And a control device that controls reverse flow power transmitted from the power supply device to the distribution system among the output power output from the power supply device. , Increase the reverse flow power based on the reverse flow information and the receiving unit that receives the reverse flow information including the increase instruction that instructs the increase of the reverse flow power transmitted from the power supply device to the distribution system And an instruction unit for instructing the power transmission system.

  According to the present invention, a grid interconnection device, a grid interconnection system, a power transmission system, and a control device that can alleviate power shortage at a substation using a reverse power flow from a power supply device provided in each consumer. Can be provided.

  Below, the grid connection system which concerns on embodiment of this invention is demonstrated, referring drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[First Embodiment]
(Configuration of power transmission system)
Hereinafter, the configuration of the power transmission system according to the first embodiment will be described with reference to the drawings. FIG. 1 is a schematic diagram illustrating a configuration of a power transmission system according to the first embodiment.

  As shown in FIG. 1, the power transmission system includes a high-voltage power supply source 10, a substation 20, and a plurality of consumers 30.

  The high voltage power supply source 10 transmits high voltage power to the substation 20 via the high voltage transmission line 40. The high-voltage power supply source 10 is, for example, a power plant.

  The substation 20 steps down the high-voltage power transmitted via the high-voltage power transmission line 40 and transmits AC power to each consumer 30 via the power transmission line 50 (power transmission line 50A to power transmission line 50C). The configuration of the substation 20 will be described later.

  Each customer 30 includes a power supply device, a power consuming device, and a grid interconnection device. Examples of the power supply device include a solar power generation device, a wind power generation device, a gas engine power generation device, a fuel cell power generation device, and a secondary battery. The power consuming device is, for example, a home appliance that operates while consuming electric power. The power supply device, the power consuming device, and the power transmission line 50 are connected to each other via the grid interconnection device. The configuration of the customer 30 will be described later.

  Here, each customer 30 is classified into a plurality of districts according to a geographical area, an electric power company, and the like. For example, the customer 30A to the customer 30C are connected to the power transmission line 50A and are classified into the district A. Similarly, the customer 30P to the customer 30R are connected to the power transmission line 50B and are classified into the district B. The customer 30X to the customer 30Z are connected to the power transmission line 50C and are classified into the district C.

  The substation 20 described above controls transmission of AC power for each transmission line 50. That is, the substation 20 manages each customer 30 for every district. Below, the unit which the substation 20 manages each consumer 30 is called a power distribution system (henceforth, bank). Specifically, the substation 20 manages the customer 30 provided in the district A as the bank A. Similarly, the substation 20 manages the customer 30 provided in the district B as the bank B, and manages the customer 30 provided in the district C as the bank C.

(Configuration of substation)
Hereinafter, the configuration of the substation according to the first embodiment will be described with reference to the drawings. FIG. 2 is a block diagram illustrating a configuration of the substation 20 according to the first embodiment.

  As illustrated in FIG. 2, the substation 20 includes a power transmission control unit 21, a reverse power flow information generation unit 22, and a transmission unit 23.

  The power transmission control unit 21 includes a plurality of relays 21A to 21C. Each relay switches whether or not AC power generated by stepping down high-voltage power with a transformer (not shown) is transmitted to each bank. Specifically, the relay 21 </ b> A switches whether to transmit AC power to each customer 30 provided in the district A. Similarly, the relay 21B switches whether to transmit AC power to each customer 30 provided in the district B. Does the relay 21C transmit AC power to each customer 30 provided in the district C? Switch between no.

  The reverse power flow information generation unit 22 generates reverse power flow information including an increase instruction for instructing an increase in the reverse power flow when there is a risk of power shortage at the substation 20. Here, the increase instruction is for causing the grid interconnection device 100 described later to start increasing the reverse flow power. In addition to the increase instruction, the reverse power flow information according to the first embodiment includes type information of the power supply device, area information, and power information in order to control the grid interconnection device 100 in detail. Hereinafter, such information will be described.

(1) Type information The type information is information for specifying the type of the power supply device that should increase the reverse power flow based on the increase instruction.

  The type information may be information that identifies a power supply device whose rated output capacity of the power supply device is a predetermined value or more. The type information may be application information that specifies whether the power supply device is for public use or private use. The type information may be property information that identifies the type of the power supply device. For example, solar power generators and wind power generators can be classified into environmentally friendly clean energy types because they use sunlight and wind power. However, sunlight and wind power fluctuate due to weather conditions and the output power fluctuates due to this influence. On the other hand, gas engine power generation devices, fuel cell power generation devices, secondary batteries, and the like can be classified into stable supply types because output power is stable.

(2) Regional information Regional information is information that identifies a region where reverse power flow should be increased based on an increase instruction.

  The regional information may be information that identifies a bank (district). Further, the area information may be information for specifying an area wider than the bank (district), or may be information for specifying an area narrower than the bank (district). For example, the area information may be information for specifying an area divided in units of municipalities, or may be information hierarchized according to the area size.

(3) Power information The power information is information for specifying the magnitude of the reverse power flow (for example, wattage or x% of the rated output capacity).

  The power information is calculated based on the voltage drop tendency of each bank, the rated output capacity of the power supply device provided in each consumer 30, and the rated consumption capacity of the power consuming device provided in each consumer 30. . Specifically, as shown in FIG. 3, the reverse power flow information generation unit 22 calculates the voltage drop tendency (voltage drop width Δv / time width Δt), so that the voltage V of each bank becomes the lower limit of the voltage management range. It is detected that there is a risk of falling below the value (that is, power shortage occurs). Next, based on the rated output capacity of the power supply device and the rated consumption capacity of the power consuming device, it is calculated how much reverse power flow can be obtained from each consumer 30 to solve the power shortage.

  In addition, when each consumer 30 introduces a power supply device, the type and rated output capacity of the power supply device are presented to the power company. When each customer 30 makes a contract with an electric power company, the type of electric power consuming device and the rated consumption capacity are presented to the electric power company. Therefore, it should be noted that the substation 20 can acquire the rated consumption capacity of the power consuming device 31 and the rated output capacity of the power supply device 32 based on the information presented to the power company. The voltage V may be measured at each interconnection point where the grid interconnection device of each customer 30 and each transmission line 50 are connected. In this case, the average value, the maximum value, the minimum value, and the like of the measured values at each interconnection point may be used as the voltage V.

  The transmission unit 23 transmits the reverse flow information generated by the reverse flow information generation unit 22 to each consumer 30. Specifically, the transmission unit 23 transmits reverse power flow information to all consumers 30 by power line communication or the like using each power transmission line 50. Accordingly, the transmission unit 23 notifies the reverse power flow information to all banks.

  Further, the transmission unit 23 transmits the reverse power flow information to each customer 30 through a transmission path different from each power transmission line 50. For example, in the terrestrial digital broadcasting, the transmission unit 23 transmits the reverse power flow information to each consumer 30 using a data distribution area provided separately from the content distribution area.

(Composition of customers)
Below, the structure of the consumer which concerns on 1st Embodiment is demonstrated, referring drawings. FIG. 4 is a block diagram illustrating a configuration of the customer 30 according to the first embodiment.

  As illustrated in FIG. 4, the customer 30 includes a plurality of power consuming devices 31 (power consuming devices 31 </ b> A to 31 </ b> C), a power supply device 32, and the grid interconnection device 100. It should be noted that the power supply device 32 and the grid interconnection device 100 constitute a grid interconnection system.

  The power consuming device 31 is a home appliance that operates while consuming AC power transmitted through a bank (power transmission line 50), power output by the power supply device 32, and the like.

  The power supply device 32 is a device such as a solar power generation device, a wind power generation device, a fuel cell power generation device, a gas engine power generation device, a fuel cell power generation device, or a secondary battery. The power supply device 32 can output power without using AC power transmitted through the bank (power transmission line 50).

The grid interconnection device 100 controls the interconnection of each of the bank (power transmission line 50), the plurality of power consumption devices 31, and the power supply device 32. In the state where the bank (power transmission line 50) and the power supply device 32 are connected, the power output by the power supply device 32 is not only consumed by the plurality of power consumption devices 31, but also via the power transmission line 50. Electric power can be transmitted (reverse power flow) to other customers 30. The grid interconnection device 100 according to the present embodiment starts to increase the reverse flow power in response to the increase instruction included in the reverse flow information transmitted from the transmission unit 23 of the substation 20. Here, the reversely flowing power P _i is expressed as P _i = P _o −P _d when expressed by the power P _d consumed by the power consuming device 31 and the output power P _o output from the power supply device 32. Can do. Therefore, in order to increase the reverse power flow, it is necessary to increase the output power of the power supply device 32 or suppress the power consumption of the power consuming device 31.

(Configuration of grid interconnection device)
Below, the structure of the grid connection apparatus which concerns on 1st Embodiment is demonstrated, referring drawings. FIG. 5 is a block diagram showing a configuration of the grid interconnection device 100 according to the first embodiment.

  As illustrated in FIG. 5, the grid interconnection device 100 includes a reception unit 101, a storage unit 102, a determination unit 103, and a control unit 104.

  The receiving unit 101 receives reverse power flow information including the increase instruction, type information, area information, power information, and the like described above. Specifically, the receiving unit 101 receives reverse power flow information by power line communication or the like via the power transmission line 50. The receiving unit 101 receives reverse power flow information via a transmission path (not shown) different from the power transmission line 50. For example, in the terrestrial digital broadcasting, the receiving unit 101 receives reverse power flow information using a data distribution area provided separately from the content distribution area.

  The memory | storage part 102 memorize | stores the information (own area information) which specifies the area | region (own area information) which identifies the classification of the power supply device 32 provided in the own consumer 30, and the area where the own consumer 30 is provided. . FIG. 6 is a table configuration diagram illustrating an example of a table included in the storage unit 102. As shown in FIG. 6, the self-classification information includes the rated output capacity, usage, and properties of the power supply device 32. In addition, the local area information includes a power company, a municipality, a bank, and the like.

  The determination unit 103 determines whether or not the power (reverse power flow) transmitted from the power supply device 32 to each transmission line 50 should be increased based on the reverse power flow information received by the reception unit 101.

  Specifically, the determination unit 103 should increase the reverse flow power when the type information and the region information included in the reverse flow information match the own type information and the own region information stored in the storage unit 102. It is determined that On the other hand, the determination unit 103 determines that there is no need to increase the reverse flow power when the type information and the area information included in the reverse flow information do not match the own type information and the own area information.

  The control unit 104 controls the reverse power flow according to the result determined by the determination unit 103. Specifically, when the determination unit 103 determines that the reverse flow power should be increased, the control unit 104 increases the reverse flow power based on the reverse flow information. On the other hand, when the determination unit 103 determines that there is no need to increase the reverse flow power, the control unit 104 does not actively increase the reverse flow power.

  Here, the control unit 104 adjusts the magnitude of the reverse power flow to the magnitude of the reverse power specified by the power information included in the reverse power information. However, the control unit 104 controls the reverse power flow in consideration of the power supply / demand balance in the own consumer 30. Specifically, when the calculated value obtained by subtracting the power consumed by the plurality of power consuming devices 31 from the maximum output power that can be output by the power supply device 32 is positive, the control unit 104 is specified by the power information. The reverse flow power is increased up to the limit of the reverse flow power value or the calculated value. For example, the control unit 104 increases the output power from the power supply device 32 in order to increase the reverse flow power. Specifically, when the power supply device 32 is a secondary battery, by providing a normal battery and an auxiliary battery, the auxiliary battery is also used when increasing the reverse power flow. Good. When the power supply device 32 is a gas engine power generator, the output power may be increased by increasing the engine speed. As described above, in order to increase the output power, the power supply device 32 may be a power supply device that can output more power than the output power normally used by the power supply device.

  The control unit 104 controls the output power of the power supply device 32 so as to synchronize with the AC power of the bank. Specifically, when the power supply device 32 is a DC power supply (for example, a solar power generation device or a fuel cell power generation device), the control unit 104 boosts the DC power output by the power supply device 32 with a booster circuit. Then, in order to synchronize with the AC power of the bank, the inverter circuit converts the AC power into AC power. On the other hand, when the power supply device 32 is an AC power supply (for example, a wind power generator), the control unit 104 converts the AC power output by the power supply device 32 into a DC by a rectifier circuit, and then the AC of the bank. In order to synchronize with electric power, it is converted into AC power by an inverter circuit. Alternatively, the control unit 104 directly converts the AC power output by the power supply device 32 into predetermined AC power using a matrix converter circuit, a cycloconverter circuit, or the like in order to synchronize with the AC power of the bank.

(Operation of grid interconnection device)
Hereinafter, the operation of the grid interconnection apparatus according to the first embodiment will be described with reference to the drawings. FIG. 7 is a flowchart showing the operation of the grid interconnection device 100 according to the first embodiment.

  As shown in FIG. 7, in step S10, the grid interconnection device 100 receives reverse power flow information including an increase instruction, type information, area information, power information, and the like. In response to the increase instruction, the grid interconnection device 100 starts executing the following processing.

  In step S20, the grid interconnection device 100 determines whether or not the type information included in the reverse power flow information matches the own type information. When the grid interconnection device 100 determines that the type information matches the own type information, the grid interconnection device 100 proceeds to the process of step S30. On the other hand, the grid interconnection device 100 ends the process when the type information does not match the own type information.

  In step S30, the grid interconnection device 100 determines whether or not the area information included in the reverse power flow information matches the local area information. When the grid interconnection device 100 determines that the area information matches the local area information, the grid interconnection apparatus 100 proceeds to the process of step S40. On the other hand, when the grid interconnection device 100 determines that the area information does not match the local area information, the grid interconnection apparatus 100 ends the process.

  In step S40, the grid interconnection device 100 increases the reverse power flow power. In this case, the grid interconnection device 100 adjusts the magnitude of the reverse power flow according to the power information included in the reverse power information.

(Function and effect)
According to the grid interconnection device 100 according to the first embodiment, the control unit 104 increases the reverse power flow power based on the reverse power flow information including an increase instruction for instructing an increase in the reverse power flow.

  Accordingly, surplus power output by the power supply device 32 provided in each consumer 30 can be reversely flowed to the distribution system (bank). Therefore, the power shortage at the substation 20 can be alleviated using the reverse power flow from the power supply device 32.

  Further, according to the grid interconnection device 100 according to the first embodiment, the reverse power flow power is increased by increasing the output power of the power supply device 32. Therefore, the reverse flow power can be increased without limiting the power consumption of the power consuming device 31.

  Further, according to the grid interconnection device 100 according to the first embodiment, the control unit 104 increases the reverse power flow when the type specified by the type information included in the reverse flow information matches the own type information. Let Therefore, for example, the power supply device 32 is a clean energy type (solar cell power generation device, wind power generation device, etc.) or a stable supply type (gas engine power generation device, fuel cell power generation device, secondary battery, etc.). It is possible to specify the power supply device 32 by providing a standard such as “K”.

  In addition, according to the grid interconnection device 100 according to the first embodiment, the control unit 104 increases the reverse power flow when the type specified by the regional information included in the reverse power flow information matches the local region information. Let Therefore, the power supply device 32 located in a specific area can be designated. Therefore, for example, when the power supply device 32 is a solar power generation device, it is possible to exclude the power supply device 32 located under the power distribution system located under the clouds.

  Further, according to the grid interconnection device 100 according to the first embodiment, the control unit 104 increases the reverse flow power based on the power information included in the reverse flow information. Therefore, an excessive load is not imposed on the power supply device 32, and power can be supplied as much as necessary to solve the power shortage.

  Moreover, it is possible to make it reverse flow so that it may not exceed the upper limit shown in FIG. 3 based on electric power information.

[Second Embodiment]
The second embodiment will be described below with reference to the drawings. In the following, differences between the first embodiment and the second embodiment described above will be mainly described.

  Specifically, in the first embodiment described above, the reverse flow power is controlled so that the output power of the power supply device 32 does not fall below the power consumption of the plurality of power consuming devices 31, but in the second embodiment, a plurality of power flows are controlled. By suppressing the power consumption of the power consuming device 31, reverse power flow is ensured. Specifically, the reverse power flow information includes a suppression instruction that instructs suppression of the supplied power supplied from the power supply device 32 to the plurality of power consuming devices 31. The grid interconnection device 100 suppresses the power supplied to the plurality of power consuming devices 31 based on the suppression instruction.

(Configuration of grid interconnection device)
Below, the structure of the grid connection apparatus which concerns on 2nd Embodiment is demonstrated, referring drawings. FIG. 8 is a block diagram illustrating a configuration of the grid interconnection device 100 according to the second embodiment.

  As illustrated in FIG. 8, the grid interconnection device 100 according to the second embodiment further includes a power supply device detection unit 105 and a power consumption device detection unit 106.

  The power supply device detection unit 105 detects the operating state of the power supply device 32. Specifically, the power supply device detection unit 105 detects that the power supply device 32 is operating or stopped and the output power output by the power supply device 32. The power supply device detection unit 105 detects that the power supply device 32 is stopped when the output power of the power supply device 32 is “0” for a predetermined period. The power supply device detection unit 105 detects that the power supply device 32 is operating when the output power of the power supply device 32 is not “0” for a predetermined period.

  The power consumption device detection unit 106 detects the power consumption (total power consumption) consumed by the plurality of power consumption devices 31.

  The control unit 104 calculates a calculated value obtained by subtracting the power consumption of the plurality of power consumption devices 31 from the output power of the power supply device 32. When the calculated value is smaller than the magnitude of the reverse flow power specified by the power information, the control unit 104 determines the supply power to the plurality of power consuming devices 31 based on the suppression instruction and the power information included in the reverse flow information. By suppressing, the reverse flow power is increased to a magnitude specified by the power information. Specifically, for example, when the magnitude of the reverse flow power specified by the power information is 5 kW, the output power of the power supply device 32 is 6 kW, and the power supplied from the power supply device 32 to the plurality of power consuming devices 31 is 4 kW. The control unit 104 increases the reverse flow power to 5 kW by suppressing the supplied power to 1 kW.

  In addition, when the power supply device detection unit 105 detects that the output power of the power supply device 32 is substantially equal to the rated output capacity, the control unit 104 suppresses the power supplied to the plurality of power consumption devices 31. In this case, the control unit 104 makes the difference between the output power of the power supply device 32 and the power supplied to the plurality of power consuming devices 31 substantially equal to the magnitude of the reverse flow power specified by the power information. The control unit 104 transmits the difference between the output power and the supplied power to the bank side as reverse power flow power.

  In addition, when the power supply device detection unit 105 detects that the output power of the power supply device 32 is smaller than the rated output capacity, the control unit 104 suppresses the power supplied to the plurality of power consumption devices 31 and the power supply device 32. Increase the output power. In this case, the control unit 104 makes the difference between the output power of the power supply device 32 and the power supplied to the plurality of power consuming devices 31 substantially equal to the magnitude of the reverse flow power specified by the power information. The control unit 104 transmits the difference between the output power and the supplied power to the bank side as reverse power flow power.

  Further, when the power supply device detection unit 105 detects that the power supply device 32 is stopped, the control unit 104 suppresses the power supplied to the plurality of power consumption devices 31 and operates the power supply device 32. In this case, the control unit 104 makes the difference between the output power of the power supply device 32 and the power supplied to the plurality of power consuming devices 31 substantially equal to the magnitude of the reverse flow power specified by the power information. The control unit 104 transmits the difference between the output power and the supplied power to the bank side as reverse power flow power.

  On the other hand, when the calculated value obtained by subtracting the power consumption of the plurality of power consuming devices 31 from the output power of the power supply device 32 is equal to or larger than the magnitude of the reverse power flow specified by the power information, the control unit 104 The reverse power is increased to the magnitude of the reverse power specified by the power information without suppressing the power supplied to the power consuming device 31.

(Operation of grid interconnection device)
Hereinafter, the operation of the grid interconnection device according to the second embodiment will be described with reference to the drawings. FIG. 9 is a flowchart showing the operation of the grid interconnection device 100 according to the second embodiment.

  As shown in FIG. 9, in step S110, the grid interconnection device 100 receives reverse power flow information including an increase instruction, type information, region information, power information, and suppression information.

  In step S120, the grid interconnection device 100 determines whether or not the type information included in the reverse power flow information matches the own type information. When the grid interconnection device 100 determines that the type information matches the own type information, the grid interconnection device 100 proceeds to the process of step S130. On the other hand, the grid interconnection device 100 ends the process when the type information does not match the own type information.

  In step S130, the grid interconnection device 100 determines whether or not the area information included in the reverse power flow information matches the local area information. When the grid interconnection device 100 determines that the area information matches the local area information, the grid interconnection apparatus 100 proceeds to the process of step S140. On the other hand, when the grid interconnection device 100 determines that the area information does not match the local area information, the grid interconnection apparatus 100 ends the process.

  In step S140, the grid interconnection device 100 determines whether or not the calculated value obtained by subtracting the power consumption of the plurality of power consuming devices 31 from the output power of the power supply device 32 is smaller than the magnitude of the reverse power flow identified by the power information. Determine. When the calculated value is smaller than the magnitude of the reverse power flow specified by the power information, the grid interconnection device 100 proceeds to the process of step S150. On the other hand, when the calculated value is greater than or equal to the magnitude of the reverse power flow specified by the power information, the grid interconnection device 100 proceeds to the process of step S160.

  In step S <b> 150, the grid interconnection device 100 suppresses power supplied to the plurality of power consuming devices 31. In this case, the grid interconnection device 100 makes the difference between the output power and the supplied power substantially equal to the magnitude of the reverse flow power specified by the power information.

  In step S160, the grid interconnection device 100 increases the reverse power flow power. In this case, the grid interconnection device 100 adjusts the reverse flow power to the magnitude of the reverse flow power specified by the power information.

(Function and effect)
According to the grid interconnection device 100 according to the second embodiment, the control unit 104 suppresses supply power supplied from the power supply device 32 to the plurality of power consumption devices 31 based on the suppression instruction included in the reverse power flow information. To do.

  Therefore, it is possible to reliably reversely flow the power output from the power supply device 32 provided in each consumer 30 to the distribution system (bank). As a result, the power shortage at the substation 20 can be more effectively mitigated by utilizing the reverse power flow from the power supply device 32.

Further, since it is not necessary to increase the output power of the power supply device 32, the reverse power flow power can be increased in a short time. In addition, an increase in the amount of fuel used in the power supply device 32 (for example, a fuel cell power generation device) that requires fuel for an increase in output power can be suppressed. Further, even in the power supply device 32 (for example, a solar power generation device) in which it is difficult to reliably increase the output power, the reverse power flow can be reliably increased.

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, in the above-described embodiment, the reverse power flow information is transmitted using a data distribution area in terrestrial digital broadcasting, but is not limited thereto. Specifically, reverse power flow information may be transmitted to each consumer 30 using BS broadcasting, CS broadcasting, CATV, analog TV broadcasting, radio, cable broadcasting, and the like. The reverse power flow information may be transmitted to each consumer 30 using a paging system, a mobile phone network, wireless communication (wireless LAN) based on 802.11x, the Internet, or the like. The reverse power flow information may be transmitted to each consumer 30 by expanding information used for time adjustment of the radio timepiece. The reverse power flow information may be transmitted to each customer 30 using a network. When a network is used, confirmation may be made at regular intervals with a server or the like installed on the substation 20 side. That is, the information is updated on the server, and the information becomes reverse power flow information to each customer 30.

  In the embodiment described above, the reverse power flow information is transmitted to each customer 30 through two transmission paths, but is not limited to this. Specifically, the reverse power flow information may be transmitted through one transmission path, or may be transmitted through three or more transmission paths.

  In the embodiment described above, the reverse power flow information is transmitted from the substation 20, but is not limited to this. Specifically, the reverse power flow information may be transmitted from another device (such as a power company or a broadcasting station).

  In the second embodiment described above, the reverse power flow information includes the suppression instruction. However, the reverse power flow information may not include the suppression instruction. In this case, the control unit 104 may suppress the power supplied to the power consuming apparatus so that the reverse power can be increased to the magnitude of the reverse power specified by the power information.

  In the second embodiment described above, the reverse power flow information includes the power information, but the reverse power flow information may not include the power information. In this case, the control unit 104 suppresses the power supplied to the plurality of power consuming devices 31 to a predetermined value (≧ 0) provided in advance, and the output power of the power supply device 32 is set to the bank side as reverse power flow as much as possible. Electric power may be transmitted.

  Although not particularly mentioned in the above-described embodiment, the reverse power flow information may be transmitted a plurality of times. Specifically, if the occurrence of power shortage is estimated based on past power consumption transition data etc., reverse power flow information is transmitted in advance, and when the occurrence of power shortage is almost certainly expected, Reverse power flow information may be transmitted.

  In the above-described embodiment, the risk of power shortage is detected based on the voltage drop tendency of each bank. However, the weather condition (real-time data, forecast data, etc.), season, time, calendar information, Events such as sports broadcast broadcasts (increased power consumption in air-conditioners, TVs, etc. in consumers during midsummer high school baseball broadcasts and Olympic broadcast broadcasts), and events in each bank (concert venues, etc.) In addition, the possibility of power shortage may be detected in consideration of the presence or absence of an increase in power consumption in the surrounding facilities).

  In the above-described embodiment, the grid interconnection device 100 controls the reverse power flow, but is not limited thereto. For example, a control device that increases reverse power flow is provided separately, and the control device receives a reverse power flow information from a predetermined transmission path, and an instruction to increase reverse power flow based on the reverse power information And an instruction unit for performing the above-described operation. The control device issues an instruction to the power supply device 32 to increase the output power, issues an instruction to suppress the power supplied to the power consuming device 31, to the grid interconnection device 100, or the power consuming device 31 The reverse flow power is increased by giving an instruction to suppress (or stop) the power consumption. Such a control device may be included in the power supply device 32, the power consumption device 31, or the like, or may be connected to the power supply device 32, the power consumption device 31, or the like via a wired line or a wireless line. When the control device is included in a digital television (power consuming device) that can receive terrestrial digital broadcasting, terrestrial digital broadcasting can be used as a transmission path different from each power transmission line 50.

  In the embodiment described above, the plurality of power consuming devices 31 are provided on the power distribution system side in the customer. However, the plurality of power consuming devices 31 are provided between the power supply device 32 and the grid interconnection device 100. It may be provided.

  Although not particularly mentioned in the above-described embodiment, the plurality of power consuming devices 31 are usually directly electrically connected to an outlet provided on the distribution system side. However, when an outlet is provided in the grid interconnection device 100, the plurality of power consuming devices 31 may be electrically connected directly to an outlet provided in the grid interconnection device 100.

  In the above-described embodiment, as the reverse flow information, the increase instruction, the type information, the region information, and the power information are handled separately, but the increase of the reverse flow power can be started when the reverse flow information is received. In this case, the type information, the area information, and the power information can be regarded as an increase instruction.

It is the schematic which shows the structure of the power transmission system which concerns on 1st Embodiment. It is a block diagram which shows the structure of the substation 20 which concerns on 1st Embodiment. It is a figure for demonstrating the electric power information contained in the reverse power flow information which concerns on 1st Embodiment. It is a block diagram which shows the structure of the consumer 30 which concerns on 1st Embodiment. It is a block diagram which shows the structure of the grid connection apparatus 100 which concerns on 1st Embodiment. It is a figure which shows an example of the table memorize | stored in the memory | storage part 102 which concerns on 1st Embodiment. It is a flowchart which shows operation | movement of the grid connection apparatus 100 which concerns on 1st Embodiment. It is a block diagram which shows the structure of the grid connection apparatus 100 which concerns on 2nd Embodiment. It is a flowchart which shows operation | movement of the grid connection apparatus 100 which concerns on 2nd Embodiment.

Explanation of symbols

A ... C (bank), 10 ... high voltage power supply source, 20 ... substation, 21 ... power transmission control unit, 22 ... reverse power flow information generation unit, 23 ... transmission unit, 30 ... customer, 31 ... power consumption device , 32 ... power supply device, 40 ... high-voltage power transmission line, 50 ... power transmission line, 100 ... grid interconnection device, 101 ... reception unit, 102 ... storage unit, 103 ... determination unit, 104 ... control unit, 105 ... power supply device detection unit 106: Power consumption device detection unit

Claims (6)

A grid interconnection device that is connected to a power distribution system to which AC power is transmitted, a power supply device, and a power consumption device, and that transmits output power output from the power supply device to the power consumption device and the power distribution system,
A receiving unit that receives reverse power flow information including an increase instruction that instructs an increase in reverse power flow transmitted from the power supply device to the power distribution system, from a predetermined transmission path;
A grid interconnection device comprising: a control unit that increases the reverse flow power based on the reverse flow information. The grid interconnection device according to claim 1, wherein the control unit increases the reverse flow power by increasing the output power of the power supply device. 3. The grid interconnection device according to claim 1, wherein the control unit increases the reverse flow power by decreasing power supplied from the power supply device to the power consuming device. A power supply;
A distribution system to which AC power is transmitted, the power supply device, and a power interconnection device connected to the power consumption device, and a grid interconnection device that transmits output power output from the power supply device to the power consumption device and the distribution system. A grid interconnection system,
The grid interconnection device is
A receiving unit that receives reverse power flow information including an increase instruction that instructs an increase in reverse power flow transmitted from the power supply device to the power distribution system, from a predetermined transmission path;
A grid interconnection system comprising: a control unit that increases the reverse flow power based on the reverse flow information. A substation that transmits AC power to the distribution system;
A power supply;
A power transmission system including a grid interconnection device connected to the power distribution system, the power supply device, and a power consuming device and transmitting output power output from the power supply device to the power consuming device and the power distribution system. ,
The substation generates a reverse power flow information generating unit including a reverse power flow information including an increase instruction instructing an increase in reverse power flow transmitted from the power supply device to the distribution system,
A transmission unit for transmitting the reverse power flow information to a predetermined transmission path,
The grid interconnection device is
A receiving unit for receiving the reverse power flow information from the predetermined transmission path;
A power transmission system comprising: a control unit that increases the reverse flow power based on the reverse flow information. A substation for transmitting AC power to the distribution system, a power supply device, the power distribution device, the power supply device, and the power consumption device connected to the output power, and output power output from the power supply device to the power consumption device and the power distribution system And a control device that controls reverse flow power transmitted from the power supply device to the power distribution system out of output power output from the power supply device. ,
A receiving unit that receives reverse power flow information including an increase instruction that instructs an increase in reverse power flow transmitted from the power supply device to the power distribution system, from a predetermined transmission path;
A control device comprising: an instruction unit that instructs the power transmission system to increase the reverse power flow based on the reverse power flow information.

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