JP2015177568A - Power transfer system and power transfer method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency of using power among a plurality of clusters (users).SOLUTION: A power transfer system 1 includes: a first cluster unit that is to be a power reception point of a commercial power system 2 to receive commercial power supply from the commercial power system 2; and a second cluster unit that receives commercial power supply through the first cluster unit. Each of the first cluster unit and the second cluster unit comprises: a power generation apparatus and a load apparatus; or a power storage apparatus and a load apparatus. When power is mutually transferred, through a shared power supply path, between the first cluster unit and the second cluster unit and between a plurality of the second cluster units; the power transfer system 1 selects, on the basis of a predetermined condition, a first control mode in which power transfer is controlled on the basis of information acquired from the first cluster unit or the second cluster unit through a communication network or the second control mode in which the power transfer is controlled on the basis of information acquired from the first cluster unit or the second cluster unit through the power supply path.

Description

  The present invention relates to a power accommodation system and a power accommodation method for accommodating power among a plurality of clusters (customers).

  In recent years, the introduction of distributed power sources using renewable energy using natural energy such as solar power generation and wind power generation has been actively conducted. However, since the generated power greatly depends on the weather and weather conditions, it is difficult to match the demand power, and if the generated power is more than the demand power, the power generation by the distributed power source using renewable energy is stopped. In many cases, natural energy cannot be fully utilized because it is necessary to use a simulated load or to reversely flow back to a commercial system. Thus, an electric power interchange system that efficiently matches the energy supply and demand of electric power among a plurality of clusters (between customers) has been attracting attention.

  For example, a power amount accommodation control method for a power system is disclosed (see Patent Document 1). In the power amount accommodation control method of the power system described in Patent Document 1, accommodation control of power amount is performed between a plurality of consumers via a power amount accommodation control device. The electric power interchanged among a plurality of consumers is electric power charged in the power storage unit. The power supply for supplying the power charged in the power storage unit to the load in the consumer by direct current according to the power storage remaining amount charged in the power storage unit, and the control of power supply stop are executed.

JP 2006-288162 A

In the power amount interchange control method of Patent Document 1, power amount interchange control is performed via a power amount interchange control device based on information such as a power sale request between a plurality of consumers and an acceptance response to the request. By the way, for example, when a commercial power supply system fails due to a disaster or the like, the use expectation of a distributed energy source using natural energy becomes higher. However, it is assumed that due to disasters or power outages, communication network breakdowns and traffic jams will cause information for each consumer to be acquired, and power consumption control cannot be performed via the power consumption control device. . For this reason, the mutual cooperation of the renewable energy was aimed at among several consumers, and it was an obstacle to raising the utilization efficiency of electric power.
This invention is made | formed in view of such a situation, and provides the power interchange system and the power interchange method which can improve the utilization efficiency of electric power between several clusters (customer).

  The present invention has been made to solve the above-described problems, and one aspect of the present invention is a first cluster unit that serves as a power reception point of a commercial power system and receives supply of commercial power from the commercial power system, One or a plurality of second cluster units that receive supply of the commercial power via the first cluster unit, each of which is a power interchange system, each of the first cluster unit and the second cluster unit Includes a power generation device and a load device, or a power storage device and the load device, and provides a common power feeding path between the first cluster unit and the second cluster unit and between the plurality of second cluster units. A first control mode for controlling power interchange based on information acquired from the first cluster unit or the second cluster unit via a communication network when performing power interchange with each other, and the first Kula And a second control mode for controlling power accommodation based on information acquired from the data unit or the second cluster unit via the power supply path based on a predetermined condition. System.

  In addition, according to one aspect of the present invention, in the power interchange system, the first cluster unit and the second cluster unit may have the first condition when the communication state by the communication network is normal as the predetermined condition. The control mode is selected.

  Further, according to one aspect of the present invention, in the power interchange system, the first cluster unit and the second cluster unit may be configured as the second condition when the communication state by the communication network is abnormal as the predetermined condition. The control mode is selected.

  In addition, according to one aspect of the present invention, in the power accommodation system, a cluster unit capable of supplying power to another cluster unit among the first cluster unit and the second cluster unit in the first control mode. Information indicating a cluster unit that requests power reception from another cluster unit is acquired from each cluster unit, and the first cluster unit and the second cluster are acquired based on the acquired information. A power supply management unit that controls interchange of power between the plurality of second cluster units and the plurality of second cluster units.

  Further, according to one aspect of the present invention, in the power interchange system, in the second control mode, the first cluster unit and the second cluster unit change the voltage of the power feeding path by changing the voltage of the power supply path. It is characterized by controlling the interchange of electric power based on the change of.

  In addition, according to one aspect of the present invention, in the power accommodation system, in the second control mode, a cluster unit capable of supplying power to the other cluster unit among the first cluster unit and the plurality of second cluster units. Increases the voltage of the power supply path by supplying power to the power supply path, and the other cluster unit detects the voltage of the power supply path and detects the increase of the voltage of the power supply path. Power is received from a power supply path.

  In addition, according to one aspect of the present invention, in the power accommodation system, a cluster unit that requests power reception from another cluster unit among the first cluster unit and the plurality of second cluster units in the second control mode. Changes the voltage of the power supply path in a predetermined period, and the cluster part capable of supplying power to the other cluster part among the first cluster part and the plurality of second cluster parts is in the predetermined period. The cluster unit that detects the voltage of the power feeding path, supplies power to the power feeding path after the predetermined period based on the detected result, and requests the power reception is performed after the predetermined period. It is characterized by receiving the power supplied to.

  According to another aspect of the present invention, in the power interchange system, the power feeding path includes an AC current feeding path or a DC power feeding path. In the first control mode, the AC current or the DC power In the second control mode, accommodation of the DC power is performed.

  One embodiment of the present invention is a first cluster unit that serves as a power receiving point of a commercial power system and receives commercial power from the commercial power system, and receives the commercial power supplied via the first cluster unit. Or a plurality of second cluster units, and between the first cluster unit and the second cluster unit and between the plurality of second cluster units, the power of each other is shared via a common feeding path. A power accommodation method in a power accommodation system for accommodation, wherein each of the first cluster unit and the second cluster unit is information acquired from the first cluster unit or the second cluster unit via a communication network. And a second control mode for controlling power accommodation based on information acquired from the first cluster unit or the second cluster unit via the power feeding path. A power interchange method characterized by selecting the control mode, at a predetermined condition.

  ADVANTAGE OF THE INVENTION According to this invention, the utilization efficiency of electric power can be improved between several clusters (customer).

It is a lineblock diagram showing a schematic structure of electric power interchange system 1 concerning an embodiment of the present invention. 2 is a configuration diagram illustrating a configuration example of a power generation device 141 and a PCSAC 150. FIG. It is a block diagram which shows the structural example of conversion apparatus A120 and conversion apparatus D130. It is a block diagram which shows the structural example of converter B220. It is a block diagram which shows the modification of the electric power accommodation system shown in FIG. It is explanatory drawing which shows the outline | summary of the control operation | movement of the electric power accommodation in an electric power accommodation system. It is explanatory drawing for demonstrating the electric power interchange operation | movement in a cluster part. It is explanatory drawing which shows the example which selects AC accommodation and DC accommodation according to the storage battery remaining capacity SOC of an electrical storage apparatus. It is explanatory drawing which shows the example in the case of performing AC accommodation and DC accommodation using a switching part. It is a flowchart which shows the procedure of an electric power interchange process. It is explanatory drawing which shows the example of the starting process of AC accommodation mode and DC accommodation mode. It is a flowchart which shows the procedure of the completion | finish process of DC interchange mode. It is a flowchart which shows the procedure of the completion | finish process of AC interchange mode. It is explanatory drawing which shows the example of completion | finish of AC accommodation mode. It is a flowchart which shows the procedure 1 of the electric power interchange process of 2nd Embodiment. It is a flowchart which shows the procedure 2 of the electric power interchange process of 2nd Embodiment. It is explanatory drawing which shows an example of the flow of the electric power interchange process of 2nd Embodiment. It is explanatory drawing which shows another example of the flow of the electric power interchange process of 2nd Embodiment. It is a flowchart which shows the procedure of the selection process of the control mode of 3rd Embodiment.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
<First Embodiment>
(Schematic configuration of the power interchange system 1)
FIG. 1 is a configuration diagram showing a schematic configuration of a power interchange system 1 according to the first embodiment of the present invention. As shown in FIG. 1, the power accommodation system 1 includes a parent cluster unit 100, a plurality of child cluster units 200 and child cluster units 300 placed under the parent cluster unit 100, an AC bus 31 and a DC bus. 32, and the power is interchanged. Further, the child cluster unit 400 is cascade-connected to the child cluster unit 400.

  Note that the AC bus 31 is a power supply path serving as a power supply bus for commonly connecting the parent cluster unit 100 and the plurality of child cluster units 200 and 300 to accommodate AC power. 31 may be referred to as a primary AC bus 31. In addition, the DC bus 32 is a power supply path that serves as a power supply bus for commonly connecting the parent cluster unit 100 and the plurality of child cluster units 200 and 300 to accommodate DC power. 32 may be referred to as a primary side DC bus 32. Also, in the parent cluster unit 100, the child cluster unit 200, the child cluster unit 300, and the child cluster unit 400, a power supply path that distributes AC power is called a secondary AC bus, and a power supply path that distributes DC power is Sometimes called a secondary DC bus.

  In the power accommodation system 1, the control units of the parent cluster unit 100, the child cluster unit 200, the child cluster unit 300, and the child cluster unit 400 are connected to the energy management apparatus (EMS) 11 via the communication network 12. ing. The energy management device (EMS) 11 monitors the power supply state in each cluster unit, and transmits a command signal to the control unit of each cluster unit to control its operation. For example, the energy management device (EMS) 11 collects information on the power consumption in each cluster, the power generation amount of the power generation device, and the storage battery remaining capacity SOC (State Of Charge) of the power storage device, and based on the collected information. Thus, power interchange control is performed so as to balance power consumption among the cluster units.

Note that the term “cluster” in the present embodiment refers to one unit (for example, a building unit) that includes a power generation device and a load device configured from a distributed power source using renewable energy, or a power storage device and a load device. This means an electric power cluster (electricity cluster).
For example, each of the parent cluster unit 100, the child cluster unit 200, the child cluster unit 300, and the child cluster unit 400 includes a power generation device (for example, a solar power generation device) that uses renewable energy, and an energy storage system. And a load device of a consumer.

In the power interchange system 1, the parent cluster unit 100 includes the circuit breaker (CB) 101, the transformer 102, the control unit 110, the conversion device A120, the conversion device D130, the power generation device 141, the power generation device 142, the AC load device 143, and the direct current. A load device 144, a power storage device 145, a power conditioner (PCSAC) 150, a power conditioner (PCSDC) 150A, a distribution board 161, a distribution board 162, and a switching unit 160 are provided.
In the following description, a power conditioner (PCSAC) that outputs AC power may be simply referred to as “PCSAC”, and a power conditioner (PCSDC) that outputs DC power may be simply referred to as “PCSDC”.

  In the parent cluster unit 100, the transformer 102 steps down the high-voltage AC voltage (for example, 3-phase AC 6600V) supplied from the commercial power system 2 to a predetermined low-voltage AC voltage (for example, 3-phase AC 400V). The voltage is supplied to the converter A120.

  The control unit 110 is a control unit that controls the overall operation of the parent cluster unit 100. The control unit 110 is configured using, for example, a microcomputer and its peripheral circuits, and detects current and voltage detected by a current and voltage detection unit (not shown) installed in each part of the parent cluster unit 100. The operations of the conversion device A120, the conversion device D130, and the switching unit 160 are controlled according to the signal. In addition, the control unit 110 collects information on the power generation amount of the power generation device and the storage battery remaining capacity SOC of the power storage device, and transmits the collected information to the energy management device (EMS) 11.

The converter A120 is a converter that performs bidirectional power conversion between AC power and DC power, and the converter D130 is a converter that performs bidirectional power conversion between DC power and DC power. is there. The configurations of the conversion device A120 and the conversion device D130 will be described later.
A distribution board 161 is connected to the conversion device A 120 via a power supply path 175, and a distribution board 162 is connected via a power supply path 172. The distribution board 161 is connected to the primary side AC bus 31, the AC load device 143, and one end of the switching unit 160 via an unillustrated overcurrent breaker (breaker).
In addition, power distribution device 145, PCSDC 150A, and DC load device 144 are connected to distribution board 162 via an unillustrated overcurrent breaker (breaker). Note that the DC load device 144 is a device that operates with DC power, and is, for example, DC appliances, LED lighting, information devices such as personal computers and servers, and the like.
The distribution board 161 is an AC power distribution board, and the distribution board 162 is a DC power distribution board.

  The power generation devices 141 and 142 are, for example, natural energy type power generation devices such as solar power generation and wind power generation, engine power generation devices, and fuel cells. The power conditioner (PCSAC) 150 converts the power generated by the power generation device 141 into predetermined AC power and outputs it. Further, the power conditioner (PCSDC) 150A converts the power generated by the power generator 142 into predetermined DC power and outputs it. The configurations of the power generation devices 141 and 142 and the configurations of the PCSAC 150 and the PCSDC 150A will be described later.

  The power storage device 145 is connected to the distribution board 162. The power storage device 145 includes, for example, a secondary battery such as a lithium ion battery, a lead battery, or a nickel metal hydride battery. The power storage device 145 is charged with electric power output from the power generation device 142 via the PCSDC 150A. In addition, power storage device 145 is charged by DC current Idc output from conversion device A120. This power storage device 145 supplies electric power to the DC load device 144 via the distribution board 162 by the accumulated charge during a power failure when the AC voltage (AC6600V) is not supplied from the commercial power system 2, and the distribution board 162 Power is supplied to the AC load device 143 and the primary AC bus 31 via the conversion device A120. The power storage device 145 can also supply power to the primary DC bus 32 via the distribution board 162 and the conversion device D130.

The switching unit 160 is configured with a 1c contact, a make contact is configured with the common contact c and the contact a, and a break contact is configured with the common contact c and the contact b. The switching operation of the contact in the switching unit 160 is controlled by an open / close signal (not shown) output from the control unit 110, and the common contact c and the contact a are in a conductive state (the common contact c and the contact b are non-conductive). Any state in which the common contact c and the contact b are conductive (the common contact c and the contact a are non-conductive) is selected.
The power generator 141 is connected to the common contact c via the PCSAC 150, the power supply path 174 connected to the distribution board 161 is connected to the contact b, and the transformer 102 is connected to the contact a. A power supply path 171 connected to the secondary side is connected.

In the switching unit 160, when the contact b and the common contact c are brought into conduction, the power generated by the power generation device 141 is output to the distribution board 161 via the power supply path 174. In addition, in the switching unit 160, when the contact point a and the common contact point c are brought into conduction, the power generated by the power generation device 141 is supplied as surplus power to the commercial power system 2 side through the transformer 102. Is done.
The switching unit 160 shows an example of a switch using a mechanical contact, but actually, the switching unit 160 is configured by a semiconductor switch using a semiconductor switching element such as an IGBT (Insulated Gate Bipolar Transistor). Has been. The switching unit 160A (FIG. 5) of the parent cluster unit 100, the switching unit 260 of the child cluster unit 200, the switching unit 260A (FIG. 5), the switching unit 360 of the child cluster unit 300, and the child cluster unit 400 described later. The same applies to the switching unit 460 and the like.

The basic configuration of the child cluster unit 200, the child cluster unit 300, and the child cluster unit 400 is the same as that of the parent cluster unit 100 except that it does not have a power reception point of the commercial power system 2.
For example, the child cluster unit 200 includes the control unit 210, the conversion device B220, the power generation device 241, the power generation device 242, the AC load device 243, the DC load device 244, the power storage device 245, the PCSAC250, the PCSDC250A, the switching unit 260, and the distribution board 261. , And a distribution board 262.

In the child cluster unit 200, the control unit 210 is a control unit that controls the overall operation of the child cluster unit 200. The conversion device B220 is a conversion device that performs bidirectional power conversion between AC power and DC power, and performs bidirectional power conversion between DC power and DC power. The configuration of the conversion device B220 will be described later.
A distribution board 261 is connected to the conversion device B220 via a secondary AC bus 41 inside the cluster, and a distribution board 262 is connected via a secondary DC bus 42 inside the cluster. The distribution board 261 is connected to the AC load device 243 and one end of the switching unit 260 via an unillustrated overcurrent breaker (breaker).

  The switching unit 260 is configured with a 1c contact similarly to the switching unit 160 of the parent cluster unit 100, and the power generator 241 is connected to the common contact c via the PCSAC 250, and the contact b of the switching unit 260 is connected. The side is connected to the distribution board 261, and the contact a side of the switching unit 260 is connected to the primary AC bus 31.

When the contact point b and the common contact point c are brought into conduction in the switching unit 260, the power generated by the power generation device 241 is output to the distribution board 261 via the PCSAC 250. Further, in the switching unit 260, when the contact a and the common contact c are brought into conduction, the power generated by the power generation device 241 is output to the primary AC bus 31 as surplus power.
In addition, the power distribution device 245, the PCSDC 250A, and the DC load device 244 are connected to the distribution board 262 via an unillustrated overcurrent circuit breaker (breaker).

In the child cluster unit 300, the control unit 310 is a control unit that controls the overall operation of the child cluster unit 300. The converter E320 is a converter that performs bidirectional power conversion between AC power and DC power, and performs bidirectional power conversion between DC power and DC power. The configuration of the conversion device E320 will be described later.
A distribution board 361 is connected to the converter E320 via the secondary AC bus 51 inside the cluster, and a distribution board 362 is connected via the secondary DC bus 52. The distribution board 361 is connected to an AC load device 343 and one end of a switching unit 360 via an unillustrated overcurrent breaker (breaker).

  Similarly to the switching unit 260 of the child cluster unit 200, the switching unit 360 is configured with a 1c contact (not shown), and the power generator 341 is connected to the common contact c via the PCSAC 350. The switching unit 360 The contact b side is connected to the distribution board 361, and the contact a side of the switching unit 360 is connected to the primary AC bus 31.

Then, in the switching unit 360, when the contact b (not shown) and the common contact c are brought into conduction, the power generated by the power generator 341 is output to the distribution board 361. Further, in the switching unit 360, when the contact a (not shown) and the common contact c are brought into conduction, the power generated by the power generation device 341 is output to the primary AC bus 31 as surplus power.
In addition, a power storage device 345 and a DC load device 344 are connected to the distribution board 362 via an unillustrated overcurrent circuit breaker (breaker).

The child cluster unit 400 is a cluster that is cascade-connected to the child cluster unit 300. In the child cluster unit 400, the control unit 410 is a control unit that controls the overall operation of the child cluster unit 400. The conversion device C420 is a conversion device that performs bidirectional power conversion between AC power and DC power, and performs bidirectional power conversion between DC power and DC power. The configuration of the conversion device C420 will be described later.
The conversion device C420 is connected to the child cluster unit 300 via the secondary side AC bus 61 and the secondary side DC bus 62. The secondary AC bus 61 is connected to the secondary AC bus 51 via the distribution board 361 in the child cluster unit 300. The secondary DC bus 62 is connected to the secondary DC bus 52 via the distribution board 362 in the child cluster unit 300. Further, a distribution board 461 and a distribution board 462 are connected to the conversion device C420. The distribution board 461 is connected to the AC load device 443 and one end of the switching unit 460 via an unillustrated overcurrent circuit breaker (breaker). In addition, a power storage device 445 and a DC load device 444 are connected to the distribution board 462 via an unillustrated overcurrent circuit breaker (breaker).

  Similar to the switching unit 260 of the child cluster unit 200, the switching unit 460 is configured with a 1c contact (not shown), and the power generator 441 is connected to the common contact c via the PCSAC 450. The contact b of the switching unit 460 is connected to the distribution board 461, and the contact a of the switching unit 460 is connected to the secondary AC bus 61.

  In the switching unit 460, when the contact b (not shown) and the common contact c are brought into conduction, the power generated by the power generation device 441 is output to the distribution board 461 via the power supply path 71. Further, in the switching unit 460, when the contact point a (not shown) and the common contact point c are brought into conduction, the power generated by the power generation device 441 is output to the secondary AC bus 61 as surplus power.

(Configuration of power generator and power conditioner)
Next, the configuration of the power generation device 141 and the PCSAC 150 of the parent cluster unit 100 will be described. The power generators 241 and PCSAC 250 of the child cluster unit 200, the power generators 341 and PCSAC 350 of the child cluster unit 300, and the power generators 441 and PCSAC 450 of the child cluster unit 400 have the same configuration.

  FIG. 2 is a configuration diagram illustrating a configuration example of the power generation device 141 and the PCSAC 150. The example shown in FIG. 2A shows an example in which a solar cell array 141a is used as the power generation device 141. The PCSAC 150 includes a power generation amount control unit 151, a grid interconnection control unit 152, and a DC / AC. A converter (inverter) 153 and a transformer 154 are provided.

  In order to extract the maximum power from the power generation device 141, the power generation amount control unit 151 has an operating point (maximum power point) that maximizes the output of the solar cell array 141a in the IV (current-voltage) characteristics of the solar cell array 141a. ) To control. The maximum power point of the solar cell array 141a is shifted depending on the voltage actually required by the connected load. Since the IV characteristic changes depending on the solar radiation intensity, the module temperature, the state, etc., in order to obtain the maximum power, the optimum voltage or current must be automatically followed. Therefore, the power generation amount control unit 151 controls the solar cell array 141a to operate at the maximum power point.

  Further, the grid interconnection control unit 152 can supply power output from the PCSAC 150 by being linked to the primary AC bus 31 by adjusting the phase of the output voltage of the DC / AC converter (inverter) 153. To control. The DC / AC converter (inverter) 153 converts the DC voltage output from the solar cell array 141a into an AC voltage, and supplies the AC voltage to the primary AC bus 31 via the transformer 154. It is an inverter.

  The PCSAC 150 temporarily stops its operation when a power failure occurs in the commercial power system 2. Thereafter, the supply of power from the backup power storage device 145 to the AC bus 31 via the conversion device A120 is started, and the charge stored in the power storage device 145 is eventually insufficient or depleted. When the power cannot be supplied to the PCSAC 150, the PCSAC 150 starts up again. That is, the PCSAC 150 is activated when power cannot be supplied from the power storage device 145 to the AC bus 31 during a power failure of the commercial power system 2, and supplies the power generated by the power generation device 141 to the AC bus 31. In this case, it goes without saying that the PCSAC 150 operates not in an operation mode linked to the grid but in a mode in which power is supplied independently.

FIG. 2B is a configuration diagram illustrating a configuration example of the power generation device 142 and the PCSDC 150A. The power generator 242 and the PCSDC 250A of the child cluster unit 200 have the same configuration.
In the example illustrated in FIG. 2B, an example in which a solar cell array 142a is used as the power generation device 142 is illustrated as in the example illustrated in FIG. The PCSDC 150A includes a power generation amount control unit 151, a grid interconnection control unit 152A, and a DC / DC converter 155.
The grid interconnection control unit 152 </ b> A supplies DC power to the distribution board 162 by adjusting the output voltage of the DC / DC converter 155.

(Configuration of Conversion Device A120 and Conversion Device D130)
FIG. 3 is a configuration diagram illustrating a configuration example of the conversion device A120 and the conversion device D130.
As illustrated in FIG. 3A, the conversion device A 120 includes a bidirectional AC / DC converter (bidirectional AC / DC converter) 121 and a switch unit (SW) 122.
When the switch unit 122 is in the closed state, the conversion device A120 converts a commercial AC voltage (for example, AC400V) output from the transformer 102 along the direction indicated by the broken line a through the distribution board 161. Output to the primary AC bus 31. When a power failure occurs in the commercial power system 2, the control unit 110 interrupts the switch unit 122 and disconnects (that is, disconnects) the load side of the converter A120 from the commercial power system 2.

  The bidirectional AC / DC converter 121 includes an AC / DC converter function and a DC / AC converter (inverter) function. The bi-directional AC / DC converter 121 converts AC power input from the transformer 102 into DC power along the direction indicated by the broken line b by the AC / DC converter function, and supplies the DC power feed path 172 in the cluster unit. To the distribution board 162.

Further, the bidirectional AC / DC converter 121 uses the DC / AC converter (inverter) function to accommodate the DC power supplied from the power generation device 142 and the power storage device 145 along the direction indicated by the broken line c to the primary AC bus 31. The AC power is converted to AC power, and the AC power is output to the primary AC bus 31.
The bidirectional AC / DC converter 121 converts AC power input from the primary AC bus 31 through the distribution board 161 into DC power along the direction indicated by the broken line d by the AC / DC converter function. Then, the power is output to the distribution board 162 via the DC power supply path 172 in the cluster unit.
The operation of outputting surplus power from the power generation device 141, the power generation device 142, etc. in the parent cluster unit 100 to the primary AC bus 31 as AC power may be referred to as “AC interchange” or “AC interchange”. The same applies to the child cluster unit 200, the child cluster unit 300, and the child cluster unit 400.

3B, the conversion device D130 includes a bidirectional DC converter (bidirectional DC / DC converter) 131, and between the primary DC bus 32 and the distribution board 162, Directly transfers DC power by converting DC power in both directions. For example, the bidirectional direct current converter 131 converts the direct current power supplied from the power generation device 142 and the power storage device 145 into the direct current power accommodated in the primary side DC bus 32 along the direction indicated by the broken line e. Is output to the primary side DC bus 32.
The bidirectional DC converter 131 receives DC power from the primary DC bus 32 along the direction indicated by the broken line f, converts the DC power into DC power distributed in the cluster unit, To the distribution board 162.
The operation of outputting surplus power from the power generation device 142, the power storage device 145, etc. in the parent cluster unit 100 to the primary DC bus 32 as DC power may be referred to as “DC interchange” or “DC interchange”. The same applies to the child cluster unit 200, the child cluster unit 300, and the child cluster unit 400.

(Configuration of Conversion Device B220, Conversion Device E320, and Conversion Device C420)
Next, the configuration of the conversion device B220, the conversion device E320, and the conversion device C420 will be described. Since the conversion device B220, the conversion device E320, and the conversion device C420 are conversion devices having the same configuration, the conversion device B220 is shown as a representative, and the configuration of the conversion device B220 will be described.
FIG. 4 is a configuration diagram illustrating a configuration example of the conversion device B220.
As shown in FIG. 4, the conversion device B220 includes a bidirectional AC / DC converter (bidirectional AC / DC converter) 221, a switch unit (SW) 222, and a bidirectional DC converter (bidirectional DC / DC converter). ) 223 and a switch unit (SW) 224. The bidirectional AC / DC converter 221 has a function of converting AC power into DC power and a function of converting DC power into AC power. The bidirectional DC converter 223 includes a DC / DC converter, and has a function of bidirectionally converting power between DC power and DC power.

When the switch unit 222 is in a closed state, the conversion device B220 applies an AC voltage (for example, AC400V) input from the primary AC bus 31 along the direction indicated by the broken line a to the secondary AC bus 41. To the distribution board 261. In addition, when the switch unit 222 is in the closed state, the converter B220 can output AC power from the secondary AC bus 41 toward the primary AC bus 31 in the direction opposite to the direction indicated by the broken line a. it can.
Further, the bidirectional AC / DC converter (bidirectional AC / DC converter) 221 converts the AC power supplied from the primary AC bus 31 along the direction indicated by the broken line b to DC when the switch unit 222 is closed. This can be converted into electric power, and this direct-current power can be output to the distribution board 262 via the secondary side DC bus 42.

  Further, the bidirectional AC / DC converter 221 converts the DC power input from the secondary side DC bus 42 into AC power along the direction indicated by the broken line c, and supplies this AC power to the primary side AC bus 31. be able to. In addition, when the switch unit 222 is in the open state, the bidirectional AC / DC converter 221 converts the DC power input from the secondary DC bus 42 into AC power along the direction indicated by the broken line d and converts it to the secondary side. The data can be output to the AC bus 41.

In addition, the bidirectional DC converter (bidirectional DC / DC converter) 223 is the DC power supplied to the primary DC bus 32 along the direction indicated by the broken line e when the switch unit 224 is closed. Can be converted into DC power distributed to the power supply path in the cluster unit and output to the secondary DC bus 42.
Further, the bidirectional DC converter 223 converts the DC power supplied to the secondary DC bus 42 into DC power that can be accommodated in the primary DC bus 32 along the direction indicated by the broken line f. DC power can be output to the primary DC bus 32.

  In FIG. 4, the PCSAC 250 is directly connected to the primary AC bus 31 by opening the switch unit 222 in the conversion device B220 and conducting the common contact c and the contact a of the switching unit 260. AC power can be supplied toward the primary AC bus 31. That is, AC interchange (AC interchange) can be performed from the PCSAC 250 to the primary AC bus 31 along the path indicated by the broken line A1. In this way, by making the common contact c and the contact a of the switching unit 260 conductive, when performing AC accommodation from the child cluster unit 200 to the primary AC bus 31, without passing through the conversion device B220, Power can be supplied directly from the PCSAC 250 to the primary AC bus 31. An example of performing AC interchange using this switching unit 260 will be described later.

(Modification of power interchange system 1)
FIG. 5 is a block diagram showing a modification of the power interchange system shown in FIG.
The power accommodation system 1A shown in FIG. 5 is compared with the power accommodation system 1 shown in FIG.
In the parent cluster unit 100A, the configuration is different in that the conversion device D130 in the parent cluster unit 100 shown in FIG. 1 is omitted and the switching unit 160A is newly added. Further, the configuration is different in that a switching unit 260A is newly added in the child cluster unit 200A shown in FIG. Other configurations are the same as those of the power interchange system 1 shown in FIG. For this reason, the same code | symbol is attached | subjected to the same component and the overlapping description is abbreviate | omitted.

  In this power interchange system 1A, by adding a switching unit 160A to the parent cluster unit 100A, it is possible to select whether the connection destination of the PCSDC 150A is the distribution board 162 or the primary side DC bus 32. There are features. In addition, by newly adding a switching unit 260A in the child cluster unit 200A, it is possible to select whether the connection destination of the PCSDC 250A is the distribution board 262 or the primary DC bus 32. There are features. The child cluster unit 300A is similar to the child cluster unit 200A.

  In the power interchange system 1A shown in FIG. 5, by providing the switching unit 160A in the parent cluster unit 100A, the DC power output from the power generator 142 via the PCSDC 150A is converted to the primary side DC via the switching unit 160A. There is an effect that the data can be directly connected to the bus 32 and output. Further, by providing the switching unit 260A in the child cluster unit 200A, there is an effect that the DC power output from the power generation device 242 via the PCSDC 250A can be directly connected to the primary side DC bus 32 and output.

(Power interchange control processing in the power interchange system 1)
Next, power interchange control processing in the power interchange system will be described.
In the power interchange system 1 configured as described above, a parent cluster unit 100, a child cluster unit 200, a child cluster unit 300, and a child cluster that serve as a power reception point of the commercial power system 2 and receive commercial power from the commercial power system 2 Each cluster with the unit 400 is configured such that AC power and DC power can be interchanged with each other via the primary side AC bus 31 and the primary side DC bus 32. Then, as a method of accommodating power among the parent cluster unit 100, the child cluster unit 200, the child cluster unit 300, and the child cluster unit 400, the interchange of only AC power, the interchange of only DC power, or It is possible to select three ways of accommodation including accommodation of both DC power and AC power.

FIG. 6 is an explanatory diagram illustrating an outline of a control operation of power accommodation in the power accommodation system.
In FIG. 6, the power interchange control operation will be described by taking the parent cluster unit 100 as an example, but similar control operations are performed in the child cluster unit 200, the child cluster unit 300, and the child cluster unit 400.
In the parent cluster unit 100 shown in FIG. 6, AC interchange is a case where the AC power generation amount Pac of the power generation device 141 output via the PSAC 150 is left, and the power storage device 145 is fully charged or fully charged. This is the case in a state close to. That is, this is a case where the storage battery remaining capacity SOC of the power storage device 145 is equal to or greater than a predetermined threshold.

More specifically, the AC power generation amount Pac of the power generator 141 is larger than the AC power consumption Loadac of the AC load device 143 (Pac> Loadac), and the current Idc flowing from the converter A120 to the distribution board 162 is shown in the figure. When the storage battery SOC of the power storage device 145 flows in the charging direction and is equal to or greater than a predetermined threshold value, AC interchange is performed from the parent cluster unit 100 to another cluster via the primary AC bus 31. The same applies to the child cluster unit 200, the child cluster unit 300, and the child cluster unit 400.
Note that current Idc in FIG. 6 indicates the direction of current Idc when power storage device 145 is negatively grounded, and the direction of DC current Idc indicates the direction of accommodating DC power. That is, the direction of the current of the connection line paired with GND changes depending on whether the direct current system is positive ground or negative ground. FIG. 6 shows the direction of the current Idc under the condition that the power storage device 145 is negatively grounded, and is an example in the case where the direction of the DC current Idc matches the direction of accommodating DC power.

In addition, the DC interchange (DC interchange) is a case where the DC power generation amount Pdc of the power generator 142 output via the PCSDC 150A is surplus, and the power storage device 145 is in a fully charged state or near full charge. Is the case. That is, this is a case where the storage battery remaining capacity SOC of the power storage device 145 is equal to or greater than a predetermined threshold.
More specifically, the DC power generation amount Pdc of the power generator 142 is larger than the DC power consumption Loaddc of the DC load device 144 (Pdc> Loaddc), and the current Idc flowing from the converter A120 to the distribution board 162 is shown in the figure. When the storage battery SOC of the power storage device 145 flows in the discharging direction and is equal to or greater than a predetermined threshold value, direct current interchange is performed from the parent cluster unit 100 to another cluster via the primary DC bus 32. The same applies to the child cluster unit 200, the child cluster unit 300, and the child cluster unit 400.

As described above, the AC interchange is performed when the AC power output from the PCSAC 150 is large between the cluster units, and the DC interchange is performed when the DC power output from the PCSDC 150A is large. . Moreover, as will be described later, AC interchange and DC interchange can be performed simultaneously.
The primary AC bus 31 is not only supplied with power from the commercial power system 2 but also supplied with power from the power generation device 141, the power generation device 142, and the power storage device 145. Even in such a case, the power supply ready state is maintained without causing the primary AC bus 31 to immediately fail. On the other hand, the primary side DC bus 32 is supplied with power only at the time of DC interchange.

  FIG. 7 is an explanatory diagram for explaining a power interchange operation in the cluster unit. 7 shows, for example, the AC power generation amount Pac in the parent cluster unit 100, the AC power consumption Loadac of the AC load device 143, the DC power generation amount Pdc, the DC power consumption Loadc of the DC load device 144, and the direction of the current Idc. And the state of the power storage device 145 and the power interchange state corresponding to the state are shown in a table.

In this table, the symbol “CS” is AC power supplied from the commercial power system 2 in the case of the parent cluster unit 100.
The same applies to the child cluster units 200, 300, and 400 as in the case of the parent cluster unit 100, and the code “CS” in each case is the same in the child cluster unit 200 and the child cluster unit 300. AC power supplied from the primary AC bus 31, and in the child cluster unit 400, AC power supplied from the secondary AC bus 61 of the child cluster unit 300.
In this table, the current Idc indicates a state in which DC power is interchanged from the converter A120 toward the DC distribution board 162 when the direction of the current Idc is “charging direction”. In the case where the direction is “discharge direction”, a state is shown in which DC power is interchanged from the DC distribution board 162 toward the converter A120.

In FIG. 7, as shown in a state ST10 and a state ST11 described later, for example, the amount of AC power output from the PCSAC 150 of the power generation device 141 of the parent cluster unit 100 is larger than the load power of the AC load device 143. In addition, when the power storage device 145 is fully charged and the current Idc flows in the charging direction (see FIG. 6), AC interchange is performed to the other cluster unit via the primary side AC bus 31.
Further, as shown in a state ST13 to be described later, the power generation amount of the DC power output from the PCSDC 150A of the power generation device 142 is larger than the load power of the DC load device 144, and the power storage device 145 is fully charged, Further, when the current Idc flows in the discharge direction (see FIG. 6), DC interchange is performed to the other cluster unit via the primary side DC bus 32. The same applies to the child cluster unit 200, the child cluster unit 300, and the child cluster unit 400.

Hereinafter, the state ST1 to the state ST14 in the table shown in FIG. 7 will be described.
First, states ST1 to ST3 are sub-cluster consumption states, that is, no power is exchanged from the power generation device 141 in the cluster to the DC load device 144, and the power generation device 142 and the power storage device 145 are connected to the AC load device. A state in which power interchange is not performed on the 143 side is shown.
In the state ST1 to the state ST3, the AC power generation amount Pac and the DC power generation amount Pdc do not have enough room for AC interchange or DC interchange. Therefore, neither AC interchange nor DC interchange is performed.

The state ST1 is a case where the total value “Pac + CS” of the AC power generation amount Pac and the commercial power CS is equal to the AC power consumption Loadac in the AC load device 143 (Pac + CS = Loadac), and the DC power generation amount Pdc is This is a case where the DC power consumption Loaddc is smaller than the DC load device 144 (Pdc <Loaddc).
In this state ST1, in order to compensate for the shortage of the DC power consumption Loaddc, the battery current Ibatt flows in the discharging direction from the power storage device 145 to the DC load device 144. Further, DC current Idc does not flow from power storage device 145 toward conversion device A120, and Idc is zero.

State ST2 is a case where “Pac + CS = Loadac” and the DC power generation amount Pdc is equal to the DC power consumption Loaddc in the DC load device 144 (Pdc = Loaddc). In this state ST2, current Idc is 0, and no discharge from power storage device 145 is performed (Ibatt = 0).
The state ST3 is a case where “Pac + CS = Loadac” and the DC power generation amount Pdc is larger than the DC power consumption Loaddc in the DC load device 144 (Pdc> Loaddc). In this state ST3, a current Ibatt in the charging direction flows from the power generation device 142 toward the power storage device 145.

  In addition, states ST4 to ST8 indicate a case where power interchange is performed in the cluster. For example, in the parent cluster unit 100, power is interchanged from the PCSAC 150 to the DC load device 144 side, and power is interchanged from the PCSDC 150A or the power storage device 145 to the AC load device 143 side. In the state ST4 to the state ST8, the AC power generation amount Pac and the DC power generation amount Pdc do not have enough room for AC interchange or DC interchange. Therefore, neither AC interchange nor DC interchange is performed.

  In states ST4 to ST6, the total power amount “Pac + CS” of the AC power generation amount Pac by the power generation device 141 and the power CS supplied from the commercial power system 2 is smaller than the AC power consumption Loadac in the AC load device 143. Shows the case. That is, a state is shown in which AC power is interchanged from the power generation device 142 and the power storage device 145 to the AC load device 143 inside the parent cluster unit 100.

In the state ST4, the total value “Pac + CS” of the AC power generation amount Pac and the commercial power CS is smaller than the AC power consumption Loadac in the AC load device 143 (Pac + CS <Loadac), and the DC power generation amount Pdc is DC This is a case where the DC power consumption Loaddc in the load device 144 is smaller (Pdc <Loaddc).
In this state ST4, in order to compensate for the shortage of AC power and DC power, battery current Ibatt is supplied in the discharge direction from power storage device 145 toward AC load device 143 and DC load device 144. For this reason, direct current Idc flows in the discharge direction from power storage device 145 toward conversion device A120.

  In the state ST5, “Pac + CS <Loadac” is satisfied, and the DC power generation amount Pdc is equal to the DC power consumption Loaddc in the DC load device 144 (Pdc = Loaddc). In this state ST5, in order to compensate for the shortage of AC power, battery current Ibatt is caused to flow in the discharge direction from power storage device 145 toward AC load device 143. For this reason, direct current Idc flows in the discharge direction from power storage device 145 toward conversion device A120.

  In the state ST6, “Pac + CS <Loadac” and the DC power generation amount Pdc is larger than the DC power consumption Loaddc in the DC load device 144 (Pdc> Loaddc). In this state ST6, power is supplied from the power generation device 142 toward the AC load device 143 in order to compensate for the shortage of AC power. For this reason, the direct current Idc flows in the discharge direction from the power generator 142 toward the converter A120. Further, in the state where power is supplied from the power generation device 142 to the DC load device 144 and the AC load device 143, when there is a surplus in output power, the battery current Ibatt is supplied to the power storage device 145 in the charging direction.

In addition, the state ST7 and the state ST8 indicate a case where the AC power generation amount Pac by the power generation device 141 is larger than the power consumption of the AC load device 143 (Pac> Loadac).
In the state ST7 and the state ST8, the total power “Pdc + (Pac−Loadac)” of the difference power “Pac−Loadac” between the AC power generation amount Pac and the power consumption Laodac and the DC power generation amount Pdc of the power generator 142 is obtained. It can be used as DC power.

  The state ST7 is a case of “Pdc + (Pac−Loadac) <Loaddc”. In this case, in order to compensate for the shortage of DC power, the current Idc in the charging direction from the converter A120 toward the DC load device 144 While flowing, a battery current Ibatt is caused to flow from the power storage device 145 toward the DC load device 144 in the discharging direction.

  State ST8 is a case where “Pdc + (Pac−Loadac) = Loaddc”. In this case, in order to compensate for the shortage of DC power, current Idc is supplied from converter A120 toward DC load device 144 in the charging direction. In this case, battery current Ibatt of power storage device 145 is 0 (Ibatt = 0).

  Further, from state ST9 to state ST11, the AC power generation amount Pac by the power generation device 141 is larger than the power consumption Laodac of the AC load device 143. In this case, the total power “Pdc + (Pac−Loadac)” of the difference power “Pac−Loadac” between the AC power generation amount Pac and the consumed power Laodac and the DC power generation amount Pdc of the power generation device 142 can be used as the DC power. .

  The state ST9 is a case where “Pdc + (Pac−Loadac)> Loaddc”. In this case, whether or not the current Idc is supplied from the converter A120 to the DC load device 144 side is related to the magnitude of Pdc and Loaddc. Determined by.

The state ST10 and the state ST11 are cases where the power storage device 145 is fully charged and “Pac> Loadac”, and AC exchange is performed by the primary AC bus 31.
In other words, the state ST10 is “Pac> Loadac”, “Pdc + (Pac−Loadac) <Loaddc”, and the power storage device 145 is “fully charged”. In this case, in order to compensate for the shortage of DC power, the current Idc flows from the converter A120 toward the DC load device 144 in the charging direction, and the AC power generation amount Pac of the power generator 141 has a further margin, AC interchange for the side AC bus 31 is performed.

  The state ST11 is “Pac> Loadac”, “Pdc + (Pac−Loadac) = Loaddc”, and the power storage device 145 is “fully charged”. In this case, in order to compensate for the shortage of DC power, the current Idc flows from the converter A120 toward the DC load device 144 in the charging direction, and when the power generated by the power generator 141 has a further margin, the primary AC AC interchange for bus 31 is performed.

  The state ST12 is a case of “Pac> Loadac” and a case of “Pdc> Loaddc”. Whether to perform AC accommodation or AC accommodation is determined depending on the state of charge of the power generation device 142 and the power storage device 145.

  The state ST13 is a case where “Pac + CS <Loadac”, “Pdc> Loaddc”, and the power storage device 145 is “fully charged”. In this case, in order to compensate for the shortage of AC power, current Idc is supplied in the discharge direction from power storage device 145 to conversion device A120. Further, since the power storage device 145 is fully charged, it is possible to perform direct current interchange with the primary side DC bus 32.

  The state ST14 is a case where “Pac + CS = Loadac”, “Pdc> Loaddc”, and the power storage device 145 is “fully charged”. In this case, since “Pac + CS = Loadac”, there is no need to flow current from the power generation device 142 toward the conversion device A120, and since “Pdc> Loaddc” and the power storage device 145 is fully charged, the primary side It becomes possible to perform direct current interchange with respect to the DC bus 32.

  As described above, the table of FIG. 7 has been described. As an actual determination process of whether to perform AC accommodation or DC accommodation, the battery current Ibatt flowing through the power storage device 145 is detected by a detector (not shown), and the controller 110 Determines the fully charged state based on the detected battery current Ibatt. Further, the current Idc flowing from the distribution board 162 to the conversion device A120 is detected by a detector (not shown), and the control unit 110 determines the direction of the detected current Idc. Control unit 110 determines whether to perform AC interchange or DC interchange based on the determination result of full charge determined based on battery current Ibatt and the determination result of the direction of current Idc.

(Example in which AC interchange and DC interchange are selected by the remaining battery SOC)
In the table shown in FIG. 7, for example, when the power storage device 145 is fully charged in the parent cluster unit 100, the AC power generation amount Pac output from the PCSAC 150 and the DC power generation amount Pdc output from the PCSDC 150A , Based on the direction of the current Idc flowing between the converter A120 and the distribution board 162, an example of determining AC interchange or DC interchange was shown, but depending on the remaining battery capacity SOC of the power storage device 145, It is also possible to decide whether to perform AC accommodation or DC accommodation.

FIG. 8 is an explanatory diagram showing an example in which AC accommodation and DC accommodation are selected according to the storage battery remaining capacity SOC of the power storage device. In the example illustrated in FIG. 8, an example is illustrated in which switching between AC accommodation or DC accommodation from the power storage device 145 is performed according to the remaining battery capacity SOC of the power storage device 145.
In FIG. 8, the vertical axis indicates the storage battery remaining capacity SOC, the horizontal axis indicates time t, the change in the remaining battery capacity SOC, and the AC interchange period and the DC interchange period corresponding to the change in the remaining battery capacity SOC. Shows changes.

In FIG. 8, the reference value SOC1A is a reference value corresponding to the value of the storage battery remaining capacity SOC in a state where the storage battery remaining capacity SOC is close to full charge, for example. Reference value SOC1B is, for example, a reference value having a value smaller than reference value SOC1A (that is, reference value SOC1A> reference value SOC1B). For example, in operation, power storage device 145 is charged. Is set to a value corresponding to the value of the remaining battery capacity SOC in a preferable state.
Further, in FIG. 8, the reference value SOC2A is a value of the remaining battery capacity SOC in a state where the remaining battery capacity SOC is in a fully charged state or in a state where it is preferable that the power storage apparatus 145 is not charged any more from the power generation apparatus 142 or the like in operation. Corresponding reference value. Reference value SOC2B is, for example, a reference value having a value smaller than reference value SOC2A (that is, reference value SOC2A> reference value SOC2B).

  For example, the control unit 110 of the parent cluster unit 100 uses the accumulated result of the detected value of the charge / discharge current of the power storage device 145, the detection result of the terminal voltage of the power storage device 145, or a signal indicating the state received from the power storage device 145. Based on this, the remaining battery capacity SOC is calculated. Controller 110 compares the remaining battery capacity SOC with reference value SOC1A and reference value SOC1B, and compares the remaining battery capacity SOC with reference value SOC2A and reference value SOC2B. .

As shown in FIG. 8, when the AC power generation amount Pac output from the PCSAC 150 or the DC power generation amount Pdc output from the PCSDC 150 </ b> A is large, a charging current flows through the power storage device 145, thereby causing a storage battery of the power storage device 145. The remaining capacity SOC gradually increases.
And the control part 110 performs the following processes. When the remaining battery charge SOC of the power storage device 145 becomes equal to or greater than the reference value SOC1A at time t1, the AC interchange mode is first started. Then, after time t1, the remaining battery capacity SOC further increases, and when the remaining battery capacity SOC exceeds the reference value SOC2A at time t2, the DC interchange mode is started together with the AC interchange mode.
Thereafter, the remaining battery capacity SOC changes, and when the remaining battery capacity SOC decreases to the reference value SOC2B at time t3, the DC interchange mode is stopped.
After time t3, at time t4, when the remaining storage battery SOC decreases to the reference value SOC1B, the AC interchange mode is stopped.

As described above, the control unit 110 executes the AC interchange mode in the period from the time t1 to the time t2 and the period from the time t3 to the time t4, and the AC interchange mode and the DC interchange in the period from the time t2 to the time t3. Run both modes. That is, the control unit 110 has two stages, a first stage for performing the AC accommodation mode and a second stage for executing both the AC accommodation mode and the DC accommodation mode according to the remaining battery capacity SOC of the power storage device 145. Separate the power interchange process.
Thus, when power storage device 145 becomes nearly fully charged, control unit 110 performs AC interchange with another cluster. If there is a possibility that the power storage device 145 is overcharged during the AC interchange period, the control unit 110 performs the DC interchange in accordance with the AC interchange, thereby allowing power to be accommodated to another cluster. To prevent the power storage device 145 from being overcharged.

(Example of using a switching unit for AC interchange and DC interchange)
FIG. 9 is an explanatory diagram illustrating an example in the case of performing AC accommodation and DC accommodation using the switching unit.
For example, in the child cluster unit 200A shown in FIG. 9, the control unit 210 connects the common contact c and the contact a of the switching unit 260 to connect the PCSAC 250 directly to the primary side AC bus 31, and from the PCSAC 250 to the primary side AC AC interchange can be performed toward the bus 31. That is, AC interchange can be performed from the PCSAC 250 to the primary AC bus 31 along the path indicated by the broken line A1.

In addition, the control unit 210 causes the common contact c and the contact a of the switching unit 260A to be electrically connected, thereby directly connecting the PCSDC 250A to the primary side DC bus 32 and performing DC interchange from the PCSDC 150A toward the primary side DC bus 32. Can do. That is, DC interchange can be performed from the PCSDC 250A to the primary side DC bus 32 along the path indicated by the broken line A2.
Accordingly, when AC interchange is performed from the child cluster unit 200A to the primary AC bus 31, AC power is directly supplied to the primary AC bus 31 via the switching unit 260 without passing through the conversion device B220. be able to. Further, when DC interchange is performed from the child cluster unit 200A to the primary side DC bus 32, direct current power can be directly supplied to the primary side DC bus 32 via the switching unit 260A without passing through the conversion device B220. it can.

(Power interchange processing procedure)
FIG. 10 is a flowchart showing a procedure of power accommodation processing. Hereinafter, the procedure of the power interchange process will be described with reference to the flowchart of FIG.
In FIG. 10, AC interchange is described as “AC interchange”, and DC interchange is described as “DC interchange”.

Then, for example, the control unit 110 of the parent cluster unit 100 detects that power accommodation is necessary (step S100). For example, the control unit 110 detects that power accommodation is necessary based on the AC power generation amount Pac of the power generation device 141, the DC power generation amount Pdc of the power generation device 142, the remaining battery capacity SOC, and the like. Alternatively, the control unit 110 receives a power interchange request signal sent from the energy management apparatus (EMS) 11 and detects that the power interchange is necessary.
Subsequently, the control unit 110 determines whether or not AC accommodation is necessary (step S105). For example, the control unit 110 detects the battery current Ibatt flowing through the power storage device 145 to determine the fully charged state, determines the direction of the current Idc flowing between the conversion device A120 and the distribution board 162, and determines the alternating current. It is determined whether or not it is necessary to provide accommodation.

  If it is determined in step S105 that AC accommodation is necessary (step S105: Yes), the control unit 110 connects the PCSAC 150 to the primary AC bus 31 via the switching unit 160 (step S110). . Then, the controller 110 causes the PCSAC 150 to perform a connected operation detection process for the primary AC bus 31 (step S115).

Subsequently, the control unit 110 collects AC interchangeability information (step S120). For example, the control unit 110 determines whether there is a restriction on regulation due to an agreement with an electric power company when performing AC interchange (step S125).
Subsequently, the control unit 110 determines which AC power (AC) or DC power (DC) is to be accommodated according to the designated power supply mode (step S130).
When it is determined in step S130 that AC interchange (AC interchange) is to be performed (step S130: AC), the control unit 110 starts an AC interchange mode activation process (step S140).
Subsequently, the control unit 110 determines whether or not it is necessary to activate the DC interchange mode (step S145). If it is determined in step S145 that activation of the DC accommodation mode is not necessary (step S145: No), it is determined whether or not the activation state of the AC accommodation mode is maintained (step S180).
If it is determined in step S180 that the AC interchange mode activation state is not maintained (step S180: No), the control unit 110 proceeds to step S150 and executes an AC interchange mode end process (step S150). ).
Control unit 110 transitions to an AC interchange mode end process (step S150). And after performing the process of this step S150, the control part 110 complete | finishes this electric power accommodation process.
On the other hand, when it is determined in step S180 that the AC interchange mode activation state is maintained (step S180: Yes), that is, when the AC interchange mode is maintained, the control unit 110 repeats the determination in step S180. .

  On the other hand, if it is determined in step S105 that AC accommodation is not necessary (step S105: No), if it is determined in step S125 that AC accommodation is not possible (step S125: No), DC accommodation (DC accommodation) in step S130. ) (Step S130: DC) and when it is determined in step S145 that activation of the DC interchange mode is necessary (step S145: Yes), the process proceeds to step S160, and the control unit 110 Performs the activation process of the DC interchange mode (step S160).

  Subsequently, when detecting an instruction to end the DC accommodation mode, the control unit 110 performs an end process of the DC accommodation mode (Step S170), and after completing the processing of Step S170, proceeds to Step S180. The details of the DC interchange mode end process will be described later.

As described above, in the power accommodation system 1, it is possible to increase the power use efficiency between a plurality of clusters by performing AC accommodation and DC accommodation between the clusters.
In the flowchart of FIG. 10, the procedure for power interchange processing in the parent cluster unit 100 has been described. However, similar power interchange processing is performed in the child cluster unit 200, the child cluster unit 300, and the child cluster unit 400. Is called.

(Start-up process of AC interchange mode and DC interchange mode)
FIG. 11 is an explanatory diagram illustrating an example of activation processing in the AC interchange mode and the DC interchange mode. FIG. 11A shows the AC interchange mode startup process, and FIG. 11B shows the DC interchange mode start process.

In FIG. 11A, the elapse of time t is shown in the horizontal direction, and the power supply state of the primary side AC bus 31 and the operation state of the PCSAC 150 are shown side by side in the vertical direction.
As shown in FIG. 11A, when the PCSAC 150 detects an interchange mode activation instruction sent from the control unit 110 at time t1, the PCSAC 150 temporarily stops its operation. Then, at time t2, the interconnection operation with the primary AC bus 31 is started, and supply of AC power to the primary AC bus 31 is started from time t3.

In FIG. 11B, the time t has elapsed in the horizontal direction, and the power supply state of the primary DC bus 32 and the operating state of the bidirectional DC converter 131 (see FIG. 3B) in the vertical direction. Are shown side by side.
As shown in FIG. 11 (B), when the bidirectional DC converter 131 detects an interchange mode start instruction sent from the controller 110 at time t1, the bidirectional DC converter 131 The interconnection operation with 32 is started, and the supply of DC power to the primary side DC bus 32 is started from time t3.
In the power accommodation system 1A shown in FIG. 5, when the PCSDC 150A is connected to the primary DC bus 32 via the switching unit 160A, the activation process in the DC accommodation mode is performed by using the PCSAC 150 shown in FIG. Processing according to the startup processing connected to the bus 31 is performed.

(End processing of DC interchange mode)
FIG. 12 is a flowchart illustrating a procedure of DC termination mode end processing. The termination process of the DC accommodation mode shown in FIG. 12 is an example in the case where DC accommodation is performed using the conversion device D130.
For example, in the parent cluster unit 100, the control unit 110 detects an instruction to end the DC accommodation mode while the DC accommodation mode is being executed (step S171). For example, the control unit 110 detects a DC interchange mode end instruction signal sent from the energy management device (EMS) 11. Then, the control unit 110 determines whether an end instruction has been detected (step S172).
And the control part 110 detects the completion | finish instruction | indication of DC accommodation mode (step S172: Yes), and the control part 110 detects the electric power feeding state of an accommodation destination, and the electric power feeding state of an own system (step S173), It is determined whether or not the DC interchange mode can be terminated (step S174).

If it is determined in step S174 that the DC accommodation mode cannot be ended (step S174: No), the control unit 110 waits until the DC accommodation mode can be ended.
When it is determined in step S174 that the DC interchange mode can be ended (step S174: Yes), the control unit 110 performs bidirectional DC conversion unit (bidirectional DC / DC conversion unit) 131 (FIG. 3 ( B)) is cut off (step S175).
And the control part 110 complete | finishes the completion | finish process of this DC accommodation mode, after performing the process of step S175.

  In the above-described DC interchange mode end processing, an example in which the output of the bidirectional AC / DC converter 121 is shut off at the end of the DC interchange mode has been shown. However, switching from the PCSDC 150A as in the parent cluster unit 100A shown in FIG. When DC power is supplied to the primary DC bus 32 via the unit 160A, the operation of the PCSDC 150A may be stopped.

(End processing of AC interchange mode)
FIG. 13 is a flowchart showing the procedure of the AC interchange mode end process. Note that the example shown in FIG. 13 is an example in which AC power is output from the PCSAC 250 to the primary DC bus 32 via the switching unit 260, as shown in FIG.
Hereinafter, the termination process of the AC interchange mode will be described using the child cluster unit 200 as an example.
First, in the child cluster unit 200, the control unit 210 detects an AC interchange mode end instruction during execution of the AC interchange mode (step S151). For example, the controller 210 detects an AC interchange mode end instruction sent from the energy management apparatus (EMS) 11. Then, control unit 210 determines whether or not an end instruction has been detected (step S152).

In step S152, if an AC interchange mode end instruction has not been detected (step S152: No), control unit 210 waits until an AC interchange mode end process is detected.
In step S152, when an instruction to end the AC accommodation mode is detected (step S152: Yes), the control unit 210 detects the state of the accommodation destination and the state of the own system (step S153). It is determined whether or not termination is possible (step S154).

If it is determined in step S154 that the AC accommodation mode cannot be ended (step S154: No), the control unit 210 waits until the AC accommodation mode can be ended.
When it is determined in step S154 that the AC interchange mode can be terminated (step S154: Yes), the control unit 210 stops the output of the PCSAC 250 (step S155).
Subsequently, the control unit 210 changes the connection destination of the PCSAC 250 from the primary AC bus 31 to the secondary AC bus 41 of the child cluster unit 200 (step S156). Then, the control unit 210 connects the output of the PCSAC 250 to the secondary AC bus 41 (step S157), and after this connection is completed, outputs power from the PCSAC 250 to the secondary AC bus 41 (step S158). ).
And the control part 210 finishes the completion | finish process of this AC accommodation mode after execution of the process of step S158.

  In the case of a configuration in which the PCSDC 250A is connected to the primary DC bus 32 as in the child cluster unit 200A shown in FIG. 9, when the DC interchange mode is terminated, a process according to the above-described AC interchange mode process is performed. Is done.

FIG. 14 is an explanatory diagram showing an example of the AC interchange mode end processing. The end process shown in FIG. 14 is a time chart showing the processing procedure described in the flowchart of FIG. 13 described above.
In FIG. 14, the elapse of time t is shown in the horizontal direction, and the power supply state of the primary AC bus 31 and the operation state of the PCSAC 250 are shown side by side in the vertical direction.
As shown in FIG. 14, power is supplied from the PCSAC 250 to the primary AC bus 31 before time t1. Then, at time t1, the control unit 210 detects an AC interchange mode end instruction, and at subsequent time t2, detects the state of the accommodation destination and the state of the own system. Subsequently, at time t3, the control unit 210 determines whether or not the AC interchange mode can be ended. When it is determined that the AC interchange mode can be ended, at time t4 after time t3, the control unit 210 stops the output of the PCSAC 150 and supplies power from the PCSAC 250 to the primary AC bus 31. Stop.

  Then, at time t5, the switching unit 260 disconnects the connection between the PCSAC 250 and the primary AC bus 31. At time t6 following time t5, the control unit 210 switches the PCSAC 250 to the secondary AC bus 41. Connecting. Then, at time t7 following time t6, the control unit 210 connects the PCSAC 250 to the secondary AC bus 41, and from time t8 thereafter, the control unit 210 transmits AC power from the PCSAC 250 to the secondary AC bus 41. To supply.

  In the DC interchange mode, as shown in the parent cluster unit 100A in FIG. 5, in the case of the configuration in which the PCSDC 150A is connected to the primary DC bus 32 via the switching unit 160A, the DC interchange mode end processing is described above. The process is based on the AC interchange mode end process.

  As described above, in the power interchange system 1 according to the present embodiment, the control units of the parent cluster unit 100, the child cluster unit 200, the child cluster unit 300, and the child cluster unit 400 are connected via the communication network 12. It is connected to an energy management device (EMS) 11. The energy management device (EMS) 11 monitors the power supply state in each cluster unit, and transmits a command signal to the control unit of each cluster unit to control its operation. For example, the energy management device (EMS) 11 collects information on the power consumption in each cluster, the power generation amount of the power generation device, and the remaining battery capacity SOC of the power storage device, and based on the collected information, each cluster unit The power interchange is controlled so as to balance the power consumption between the two.

  For example, the control unit of each cluster unit receives a power interchange request signal sent from the energy management device (EMS) 11 and detects that power interchange is necessary. Thereby, in the power interchange system 1, control of power interchange is started. In addition, the control unit of each cluster unit, during the execution of the DC accommodation mode or the execution of the AC accommodation mode, sends a signal indicating the end of the DC accommodation mode sent from the energy management device (EMS) 11 or the end of the AC accommodation mode. When the instruction signal is detected, a DC interchange mode end process or an AC interchange mode end process is executed.

  As described above, according to the power interchange system 1 according to the present embodiment, for example, the energy management apparatus (EMS) 11 collects information on each cluster unit via the communication network 12, and the power is based on the collected information. By transmitting a request signal for accommodation and an instruction for ending power accommodation to each cluster unit via the communication network 12, the power accommodation between the cluster units is controlled.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. Since the configuration of the power accommodation system (for example, the power accommodation system 1) of this embodiment is the same as that of the first embodiment, characteristic processing in this embodiment will be described. In the first embodiment, for example, the energy management device (EMS) 11 collects information on the power consumption in each cluster, the power generation amount of the power generation device, and the storage battery remaining capacity SOC of the power storage device. An example in which power interchange control is performed based on information so as to balance power consumption among the cluster units has been described. In the present embodiment, a process in the case where power interchange is performed between clusters without using information transmitted from the energy management apparatus (EMS) 11 or information transmitted from the control unit of each cluster unit will be described.

(Procedure for power interchange processing according to the second embodiment)
Here, in the power accommodation system 1 shown in FIG. 1, direct current accommodation (“DC accommodation”) is performed between the parent cluster unit 100, the child cluster unit 200, and the child cluster unit 300 via the primary side DC bus 32. Will be described as an example.

  Specifically, for example, of the parent cluster unit 100, the child cluster unit 200, and the child cluster unit 300, the cluster unit that can supply power to other cluster units (that is, the power can be interchanged) is the primary side DC bus 32. Is started, the voltage of the primary side DC bus 32 is changed. On the other hand, of the parent cluster unit 100, the child cluster unit 200, and the child cluster unit 300, the cluster unit that requires flexible power detects the voltage of the primary side DC bus 32, and the primary side DC bus is based on the detected result. It receives power from the bus 32. Thereby, power interchange processing is possible without using information transmitted from the energy management apparatus (EMS) 11 or information transmitted from the control unit of each cluster unit.

FIG. 15 and FIG. 16 are flowcharts showing the procedure of the power interchange process of this embodiment.
FIG. 15 shows a processing procedure (procedure 1) on the side that accommodates power, and FIG. 16 shows a processing procedure (procedure 2) on the side that receives the accommodation power.
First, with reference to FIG. 15, a procedure (procedure 1) of processing on the side where power is accommodated will be described.
Here, description will be made assuming that parent cluster unit 100 is a cluster unit that can supply power to other cluster units (that is, DC interchange is possible).

  The control unit 110 of the parent cluster unit 100 determines the power generation state, power supply state, power storage state, etc. in the own cluster unit as the AC power generation amount Pac of the power generation device 141, the DC power generation amount Pdc of the power generation device 142, the direction of the current Idc, The battery current Ibatt flowing through the device 145 or the remaining battery capacity SOC is detected by a detector (not shown) (step S211). Then, based on the result detected in step S211, control unit 110 determines whether or not DC interchange is possible (power can be supplied) to other cluster units (step S212). When it determines with DC interchange not possible in step S212 (step S212: No), the control part 110 returns a process to step S211.

  On the other hand, when it is determined in step S212 that DC interchange is possible (step S212: Yes), the control unit 110 converts the conversion device A120, based on the power generation state, the power supply state, the power storage state, and the like in the own cluster unit. The distribution board 162 and the conversion device D130 are controlled to supply DC power for accommodating other cluster units to the primary side DC bus 32 (step S213). That is, the parent cluster unit 100 starts the DC accommodation mode by starting the power supply to the primary side DC bus 32. For example, when power supply is started from the parent cluster unit 100 to the primary side DC bus 32, the power of the primary side DC bus 32 is supplied from a voltage (for example, 0 V) to which no power is supplied. The voltage rises.

  Here, when power supply from the parent cluster unit 100 to the primary side DC bus 32 is started, the cluster unit having a power reception request starts receiving power by detecting that the voltage of the primary side DC bus 32 has increased. To do. For example, when the cluster unit having a power reception request detects that the voltage of the primary side DC bus 32 is higher than a predetermined first threshold, the cluster unit starts power reception. The first threshold value is set in advance as a voltage threshold value for determining whether or not power reception from the primary DC bus 32 can be started. Hereinafter, the first threshold value may be referred to as “threshold value Vth1”. When the voltage of the primary side DC bus 32 is higher than the threshold value Vth1, the power reception from the primary side DC bus 32 is started. The process on the side of receiving the accommodation power will be described later with reference to FIG.

  Next, the control unit 110 of the parent cluster unit 100 detects the voltage of the primary side DC bus 32 by a detector (not shown), and whether or not DC interchange is possible (that is, whether there is a power supply margin). Is determined (step S214). For example, the control unit 110 determines whether or not DC interchange can be continued by determining whether or not the voltage of the primary side DC bus 32 is equal to or lower than a predetermined second threshold value. This second threshold value is set in advance as a voltage threshold value for determining whether or not the power reception from the primary side DC bus 32 can be continued. Hereinafter, the second threshold value may be referred to as “threshold value Vth2”. When the voltage of the primary side DC bus 32 becomes equal to or lower than the threshold value Vth2 during power reception from the primary side DC bus 32, power reception from the primary side DC bus 32 is stopped.

  In addition, the control unit 110 of the parent cluster unit 100 measures the power supply time that is an elapsed time since the start of power supply to the primary side DC bus 32 in step S213 by using a time measuring unit provided therein, and this power supply time is a predetermined time. It is determined whether it is within the time limit (step S215). Here, the predetermined time limit is set in advance as a maximum time for continuing power supply for DC interchange. When the power supply time exceeds this time limit, the power supply to the primary DC bus 32 is stopped even if the voltage of the primary DC bus 32 is a voltage that can continue to receive power.

  That is, if it is determined in step S214 that DC interchange is possible (step S214: Yes) and it is determined in step S215 that the power supply time is within a predetermined time limit (step S215: Yes), the parent cluster The control unit 110 of the unit 100 returns the process to step S214 and continues to supply power to the primary side DC bus 32.

  On the other hand, if it is determined in step S214 that DC interchange is not possible (step S214: No), or if it is determined in step S215 that the power supply time has exceeded a predetermined time limit (step S215: No), the parent cluster The control unit 110 of the unit 100 stops the power supply to the primary DC bus 32 and ends the DC accommodation mode (step S216).

  Even if it is determined in step S215 that the power supply time has exceeded the predetermined time limit (step S215: No), if any cluster unit is receiving power from the primary side DC bus 32, Control may be performed so that power supply to the primary side DC bus 32 is not stopped, and power supply to the primary side DC bus 32 may be stopped after the power reception is stopped. Here, the parent cluster unit 100 may detect that any cluster unit is receiving power from the primary DC bus 32 based on the voltage of the primary DC bus 32. For example, since a voltage drop occurs in the primary side DC bus 32 in a state where power is being received, a cluster unit is receiving power from the primary side DC bus 32 using this voltage drop. May be detected.

Next, with reference to FIG. 16, the procedure (procedure 2) of the process on the side that receives the accommodation power will be described.
Here, a description will be given assuming that the child cluster unit 200 is a cluster unit that has a power reception request (that is, a cluster unit that requires flexible power). In the following description, the voltage of the primary side DC bus 32 may also be referred to as a voltage Vbdc.

  The control unit 210 of the child cluster unit 200 detects the voltage Vbdc of the primary DC bus 32 using a detector (not shown) (step S221). Next, the controller 210 determines whether or not the detected voltage Vbdc of the primary side DC bus 32 is higher than the threshold value Vth1 (step S222). In step S222, when it is determined that the detected voltage Vbdc is equal to or lower than the threshold value Vth1 (step S222: No), interchangeable power that can be received by the primary DC bus 32 is not supplied. Therefore, the control unit 210 returns the process to step S221 without receiving power from the primary side DC bus 32.

  On the other hand, when it is determined in step S222 that the detected voltage Vbdc is higher than the threshold value Vth1 (step S222: Yes), interchangeable power that can be received is supplied to the primary DC bus 32. Therefore, the control unit 210 generates the AC power generation amount of the power generation device 241, the DC power generation amount of the power generation device 242, the direction of the current flowing through the power supply paths 41 and 42 as the power generation state, the power supply state, the power storage state, etc. The battery current flowing through the power storage device 245 or the remaining battery capacity SOC is detected by a detector (not shown) (step S223). Then, based on the result detected in step S223, control unit 210 determines whether or not there is a power reception request, that is, whether or not the own cluster unit needs interchangeable power (step S224).

  If it is determined in step S224 that there is no power reception request (step S224: No), the control unit 210 returns the process to step S221 because no interchangeable power is required. On the other hand, when it is determined in step S224 that there is a power reception request (step S224: Yes), the control unit 210 controls the converter B220 to start receiving power from the primary DC bus 32 (step S225). . That is, the child cluster unit 200 starts the DC accommodation mode by starting to receive power from the primary side DC bus 32.

  Next, the control unit 210 detects the voltage Vbdc of the primary DC bus 32 (step S226), and determines whether or not the detected voltage Vbdc of the primary DC bus 32 is equal to or lower than the threshold value Vth2 (step S227). ). If it is determined in step S227 that the detected voltage Vbdc is equal to or lower than the threshold value Vth2 (step S227: Yes), the DC interchange is impossible, and thus the control unit 210 is connected to the primary side DC bus 32. The power reception is stopped and the DC interchange mode is terminated (step S229).

  On the other hand, when it is determined in step S227 that the detected voltage Vbdc is higher than the threshold value Vth2 (step S227: No), the control unit 210 detects the state of each unit in its own cluster, and based on the detection result, It is determined whether there is a power reception request continuously (step S228).

  If it is determined in step S228 that there is a power reception request (step S228: Yes), the control unit 210 returns the process to step S226 and continues to receive power from the primary DC bus 32. On the other hand, when it is determined in step S228 that there is no power reception request (step S228: No), the control unit 210 stops power reception from the primary side DC bus 32 and ends the DC interchange mode (step S229). .

In the example illustrated in FIG. 16, in steps S221 to S224, the child cluster unit 200 determines whether or not the voltage Vbdc of the primary DC bus 32 is higher than the threshold value Vth1, and then the voltage Vbdc is higher than the threshold value Vth1. In this case, it is determined whether or not there is a power reception request. However, it may be determined whether or not the voltage Vbdc of the primary DC bus 32 is higher than the threshold value Vth1 after determining whether there is a power reception request.
Similarly, in steps S226 to S227, the child cluster unit 200 determines whether or not the voltage Vbdc of the primary side DC bus 32 is equal to or lower than the threshold value Vth2, and then the voltage Vbdc is equal to or lower than the threshold value Vth2. Although it is determined whether or not there is a power reception request, it may be determined whether or not the voltage Vbdc of the primary DC bus 32 is equal to or lower than the threshold value Vth2 after determining whether there is a power reception request.

(Flow of power interchange processing according to the second embodiment)
Next, with reference to FIG. 17, the flow of power interchange processing according to the present embodiment will be described in detail. FIG. 17 is an explanatory diagram illustrating an example of a flow of power accommodation processing according to the present embodiment.
Here, as in the example described with reference to FIG. 15 and FIG. 16, direct current interchange (“” between the parent cluster unit 100, the child cluster unit 200, and the child cluster unit 300 via the primary side DC bus 32. In the case of “DC interchange”), for example, the parent cluster unit 100 is a cluster unit that can supply power to other cluster units (that is, DC interchange is possible), and the child cluster unit 200 is a cluster that has a power reception request. (Ie, a cluster unit that requires flexible power).

  In FIG. 17, the time t has elapsed in the horizontal direction, and the power supply state to the primary side DC bus 32 of the parent cluster unit 100 (FIG. 17A) and the power reception request state of each cluster unit (FIG. (B)), the voltage Vbdc of the primary DC bus 32 (FIG. (C)), and the current Idc of the primary DC bus 32 (FIG. (D)) are shown side by side.

  Before time t11, power is not supplied to the primary side DC bus 32 (power supply is stopped), and the voltage Vbdc of the primary side DC bus 32 is a voltage V0 (for example, 0 V) (FIG. (C)). )).

  At time t <b> 11, when DC interchange is possible (power can be supplied), the control unit 110 of the parent cluster unit 100 controls the conversion device D <b> 130 and starts power supply to the primary side DC bus 32. Thereby, the power supply state with respect to the primary side DC bus 32 of converter D130 changes from the power supply stop state to the state (power supply state) in which electric power is supplied (FIG. (A)). In response to this power supply, the voltage Vbdc of the primary side DC bus 32 becomes a voltage higher than the threshold value Vth1 from the voltage V0 (for example, 0 V) (FIG. (C)). At this time, since none of the cluster units receives power from the primary side DC bus 32 and no accommodation current flows, the current Ibdc of the primary side DC bus 32 is a current I0 (for example, 0 A) ( (D).

  Next, in response to the parent cluster unit 100 supplying power to the primary DC bus 32, each cluster unit determines whether or not to perform power reception in different periods set in advance. That is, a delimited time (time slot) for performing power reception determination processing is assigned to each cluster unit. Here, based on the power reception priority set in advance, the parent cluster unit 100 (from time t12 to time t13), the child cluster unit 200 (from time t13 to time t14), and the child cluster unit 300 (from time t14 to time t15). In this order, time slots for determining whether to receive power are assigned.

  From time t12 to time t13, the parent cluster unit 100 (control unit 110) determines whether or not the voltage Vbdc of the primary DC bus 32 is higher than the threshold value Vth1. In this example, the parent cluster unit 100 determines that the voltage Vbdc of the primary side DC bus 32 is higher than the threshold value Vth1, but does not need to receive power because the own cluster unit is a side that accommodates power, and therefore does not receive a power reception request. Not done (Figure (b)).

  Next, from time t13 to time t14, the child cluster unit 200 (control unit 210) determines whether or not the voltage Vbdc of the primary DC bus 32 is higher than the threshold value Vth1. In this example, at time t13, the child cluster unit 200 determines that the voltage Vbdc of the primary side DC bus 32 is higher than the threshold value Vth1 and the own cluster unit needs interchange power, and therefore detects a power reception request. Then, a power reception request is made (FIG. (B)). Based on this power reception request, the control unit 210 of the child cluster unit 200 controls the conversion device B220 and the like to start power reception. At time t13, when the child cluster unit 200 starts to receive power, the voltage Vbdc of the primary DC bus 32 drops due to the start of power interchange with the child cluster unit 200, and the threshold voltage Vth1 or less (threshold value). (Voltage higher than Vth2) (FIG. (C)). In addition, due to the start of power reception, an accommodation current flows through the primary side DC bus 32 (FIG. 4D).

  Subsequently, from time t14 to time t15, the child cluster unit 300 determines whether or not the voltage Vbdc of the primary DC bus 32 is higher than the threshold value Vth1. In this example, since the child cluster unit 300 determines that the voltage Vbdc of the primary side DC bus 32 is equal to or lower than the threshold value Vth1, the child cluster unit 300 does not make a power reception request regardless of whether or not the own cluster unit requires interchangeable power. (Figure (b)).

  Note that even when the child cluster unit 200 is receiving the accommodation power from the primary side DC bus 32, the accommodation power is still sufficient and the power can be further accommodated to other cluster units. In some cases. Furthermore, the state in which power can be accommodated means that the voltage Vbdc of the primary side DC bus 32 is higher than the threshold value Vth1. At this time, if the voltage Vbdc of the primary side DC bus 32 is higher than the threshold value Vth1 and the own cluster unit needs interchangeable power, the child cluster unit 300 also starts to receive power.

  Next, at time t21, the child cluster unit 200 (the control unit 210) does not need the interchangeable power, so cancels the power reception request and stops the power reception (FIG. (B)). As a result, the voltage Vbdc of the primary side DC bus 32 returns to a voltage higher than the threshold value Vth1 (FIG. (C)), and no interchangeable current flows through the primary side DC bus 32 (FIG. (D)).

Next, time t22 is the timing when the time limit for power supply time started from time t11 has arrived.
At time t22, the control unit 110 of the parent cluster unit 100 stops the power supply to the primary DC bus 32 by controlling the conversion device D130 and the like because the time limit for the power supply time has arrived (FIG. (A)). As a result, the voltage Vbdc of the primary side DC bus 32 becomes the voltage V0 (for example, 0 V) (FIG. (C)).

  In the example described with reference to FIG. 17 described above, each of the parent cluster unit 100, the child cluster unit 200, and the child cluster unit 300 has the primary DC bus 32 in the time (time slot) allocated thereto. Although the example which performs the process which determines whether the voltage Vbdc of this is higher than the threshold value Vth1 and the process which detects the power reception request | requirement of a self-cluster part was demonstrated, it is not restricted to this. For example, when each of the parent cluster unit 100, the child cluster unit 200, and the child cluster unit 300 detects a power reception request of its own cluster unit before the time (time slot) allocated to each, and there is a power reception request However, it may be determined whether or not the voltage Vbdc of the primary side DC bus 32 is higher than the threshold value Vth1 in the time (time slot) assigned to each.

(Another example of the flow of power interchange processing according to the second embodiment)
FIG. 18 is an explanatory diagram showing another example of the flow of power accommodation processing according to the present embodiment. In FIG. 18, before the power reception from the primary DC bus 32 of the child cluster unit 200 is completed, the supply power from the parent cluster unit 100 is insufficiently supplied. Different from the flow. As in FIG. 17, FIG. 18 shows the passage of time t in the horizontal direction. In the vertical direction, the power supply state to the primary DC bus 32 of the parent cluster unit 100 (FIG. 18A) and each cluster unit are shown. The power receiving request state (Fig. (B)), the voltage Vbdc of the primary DC bus 32 (Fig. (C)), and the current Idc (Fig. (D)) of the primary DC bus 32 are shown side by side. is there.

  The flow of processing from time t11 to time t15 is the same as the flow of processing described with reference to FIG. After the child cluster unit 200 starts to receive power at time t13 and before the child cluster unit 200 cancels the power reception request, the power interchange from the parent cluster unit 100 becomes insufficient at time t20, and the primary DC bus 32 Assume that the voltage Vbdc drops below the threshold value Vth2 (FIG. (C)). The child cluster unit 200 (control unit 210) determines that the voltage Vbdc of the primary DC bus 32 has become equal to or lower than the threshold value Vth2, thereby canceling the power reception request and stopping power reception (FIG. (B)). Then, the interchange current does not flow through the primary side DC bus 32 (FIG. 4D).

  Further, at time t20, the control unit 110 of the parent cluster unit 100 determines that the voltage Vbdc of the primary side DC bus 32 has become equal to or lower than the threshold value Vth2, thereby controlling the conversion device D130 and the like to control the primary side DC bus 32. Control is performed to stop the power supply to (Fig. (A)). Thereby, the power supply state with respect to the primary side DC bus 32 of the converter D130 transits from the power supply state (a state where power is not actually supplied due to insufficient supply) to a power supply stop state.

Thus, according to the power accommodation system (for example, power accommodation system 1) of this embodiment, each cluster part detects the voltage of a common electric power feeding path (for example, primary side DC bus 32), and the detection result Therefore, the power interchange process can be performed without using the information transmitted from the energy management apparatus (EMS) 11 or the information transmitted from the control unit of each cluster unit. For example, when the energy management device (EMS) 11 stops functioning due to a disaster, a power failure of the AC power supply system 2, or the communication network 12 fails or becomes congested, information is transmitted between the energy management device (EMS) 11 and each cluster. Even if it becomes impossible to transmit / receive the data, power can be interchanged between the clusters.
Therefore, according to the present embodiment, it is possible to increase the power use efficiency among a plurality of clusters (customers).

  In addition, with reference to FIG. 17 and FIG. 18, although the example when the accommodation of electric power was satisfied without becoming insufficient supply in the middle of electric power accommodation and the case where supply became insufficient was explained, for example, each cluster In the section, it is possible to determine whether or not the power accommodation is satisfied based on the voltage Vbdc of the primary side DC bus 32.

  For example, after the parent cluster unit 100, the child cluster unit 200, or the child cluster unit 300 determines that the voltage Vbdc of the primary side DC bus 32 is higher than the threshold value Vth1, the voltage Vbdc of the primary side DC bus 32 falls below the threshold value Vth2. Based on the previous voltage, it may be determined whether or not the accommodation of power to the cluster unit received from the primary DC bus 32 is satisfied. That is, the parent cluster unit 100, the child cluster unit 200, or the child cluster unit 300 has the power interchange to the cluster unit based on the change in voltage when any cluster unit stops receiving the interchanged power. You may determine whether it was satisfied.

  For example, when the power interchange is satisfied, the interchange power is continuously supplied from the parent cluster unit 100 to the primary DC bus 32 even after the power reception of the child cluster unit 200 is stopped, as shown in FIG. Has been. Therefore, the voltage Vbdc of the primary side DC bus 32 once returns to a voltage higher than the threshold value Vth1, and then the power supply from the parent cluster unit 100 is stopped and becomes equal to or lower than the threshold value Vth2.

  On the other hand, when the supply becomes insufficient during the power interchange, as shown in FIG. 18, since the power reception of the child cluster unit 200 is stopped together with the supply shortage, the voltage Vbdc of the primary DC bus 32 remains unrecovered. It becomes the threshold value Vth2 or less (without increasing).

  Therefore, the parent cluster unit 100, the child cluster unit 200, or the child cluster unit 300 has a voltage that is equal to or lower than the threshold Vth1 before the voltage Vbdc of the primary side DC bus 32 becomes equal to or lower than the threshold Vth2, and from the voltage that is equal to or lower than the threshold Vth1. When the voltage changes to a voltage equal to or lower than the threshold value Vth2, it is determined that the power interchange from the primary side DC bus 32 to the cluster unit (here, the child cluster unit 200) is insufficient.

  Further, the parent cluster unit 100, the child cluster unit 200, or the child cluster unit 300 has a voltage that is equal to or lower than the threshold value Vth1 before the voltage Vbdc of the primary DC bus 32 becomes equal to or lower than the threshold value Vth2, and from the voltage that is equal to or lower than the threshold value Vth1. If the voltage changes to a voltage lower than the threshold Vth2 after changing to a voltage higher than the threshold Vth2, it is determined that the power interchange from the primary DC bus 32 to the cluster unit (here, the child cluster unit 200) is satisfied. May be.

  In addition, the parent cluster unit 100, the child cluster unit 200, or the child cluster unit 300 may control subsequent processing based on the determination result by determining whether or not power accommodation is satisfied. For example, when power interchange is insufficient, other cluster units that can supply power may be controlled so as to advance the timing of starting the supply of flexible power next, and the insufficient cluster unit has the highest priority. The priority may be controlled so as to receive power at.

17 and 18, the example in which it is determined whether or not the power interchange is satisfied based on the voltage Vbdc of the primary DC bus 32 has been described. However, the voltage Vbdc of the primary DC bus 32 and the primary side are determined. The determination may be made using the current Ibdc of the DC bus 32.
For example, when the current Ibdc of the primary DC bus 32 is larger than the threshold value Ith1, it is assumed that the accommodation current is flowing. On the other hand, when the current Ibdc of the primary DC bus 32 is equal to or less than the threshold value Ith2, it is assumed that no accommodation current is flowing. The threshold value Ith1 and the threshold value Ith2 are set in advance as threshold values for determining, for example, a state where the accommodation current is flowing and a state where the accommodation current is not flowing.
When the power interchange is satisfied, as shown in FIG. 17, the current Ibdc of the primary DC bus 32 is less than or equal to the threshold Ith2 before the voltage Vbdc of the primary DC bus 32 becomes less than or equal to the threshold Vth2. . On the other hand, when the supply becomes insufficient during the power interchange, as shown in FIG. 18, the current Ibdc of the primary DC bus 32 is set to the threshold value at the timing when the voltage Vbdc of the primary DC bus 32 becomes the threshold value Vth2 or less. It becomes Ith2 or less. Therefore, in the parent cluster unit 100, the child cluster unit 200, or the child cluster unit 300, the voltage Vbdc of the primary side DC bus 32 becomes lower than the threshold value Vth2, and the current Ibdc of the primary side DC bus 32 becomes lower than the threshold value Ith2. Based on the timing, it can also be determined whether or not power accommodation has been satisfied.

  As described above, according to the present embodiment, since each cluster unit exchanges power with each other based on a change in voltage of a common power supply path, information transmitted from the energy management device (EMS) 11 and Power interchange processing can be performed without using information transmitted from the control unit of each cluster unit. For example, the energy management device (EMS) 11 may not function due to a disaster or a power failure of the commercial power supply system 2, or the communication network 12 may be broken or jammed (failure), resulting in the energy management device (EMS) 11 and each cluster. Even if information cannot be transmitted and received between the clusters, power can be interchanged between the clusters.

In the present embodiment, the power interchange process is started in response to the start of power supply to the primary side DC bus 32 by the cluster unit that can supply power (that is, the cluster unit on the side where power is interchanged). However, the power interchange processing is started in response to a request for power reception via the primary side DC bus 32 by a cluster unit that requests power reception (that is, a cluster unit that requires power interchange). You may make it do.
For example, among the parent cluster unit 100, the child cluster unit 200, and the child cluster unit 300, a cluster unit that needs interchange power from other cluster units sends a power reception request to the primary DC bus 32 during a predetermined period. The voltage of the primary DC bus 32 is changed by supplying power. On the other hand, of the parent cluster unit 100, the child cluster unit 200, and the child cluster unit 300, a cluster unit that can supply power to another cluster unit (that is, power can be interchanged) is the primary DC bus 32 in the predetermined period. Based on the detected result, the interchangeable power is supplied to the primary side DC bus 32 after the predetermined period. As for the subsequent processing, as in the above-described embodiment, the cluster unit that requires flexible power detects the voltage of the primary DC bus 32 after the predetermined period, and based on the detected result, the primary unit Power is received from the side DC bus 32. As described above, even when a cluster unit that requests power reception (that is, a cluster unit that requires interchangeable power) first issues a power reception request, information transmitted from the energy management device (EMS) 11 and control of each cluster unit Power interchange processing is possible without using information transmitted from the unit.

In the present embodiment, the case where the cluster unit capable of supplying power is the parent cluster unit 100 has been described as an example. However, a cluster unit other than the parent cluster unit 100 (for example, the child cluster unit 200, the child cluster unit 300, etc.). It may be a cluster part that can supply power. In addition, a plurality of cluster units may be in a state where power can be supplied. Therefore, in the power accommodation system (for example, the power accommodation system 1) of the present embodiment, when a plurality of cluster units are in a state where power can be supplied, control is performed so that the plurality of cluster units do not overlap and supply the accommodation power. May be.
For example, a plurality of cluster units overlap each other by detecting the voltage of the primary side DC bus 32 and supplying interchangeable power only when power is not supplied to the primary side DC bus 32. Then, it may be controlled not to supply the accommodation power.

Further, in the power accommodation system (for example, the power accommodation system 1) of the present embodiment, when power interchange between the child cluster units is performed first and power interchange cannot be performed between the child cluster units, the parent cluster can be used. You may control so that the electric power interchange from the part 100 may be performed. For example, in a process when a cluster unit capable of supplying power starts supplying flexible power, it is determined whether or not to supply flexible power in the order of the child cluster unit 200, the child cluster unit 300, and the parent cluster unit 100. A time slot may be assigned. In other words, the child cluster units 200 and 300 are set to have priority over the parent cluster unit 100 as the cluster unit that supplies the interchanged power. Each cluster unit may detect the voltage of the primary side DC bus 32 according to the order based on the priority, and supply the interchangeable power only when the power is not supplied to the primary side DC bus 32.
As described above, only when the voltage of the primary DC bus 32 is detected in the order of the child cluster unit 200, the child cluster unit 300, and the parent cluster unit 100 in the order based on the priority, and power is not supplied to the primary DC bus 32. By supplying interchange power, power interchange between the child cluster units is performed first, and power interchange from the parent cluster unit 100 is performed when power interchange cannot be performed between the child cluster units. can do.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. In the first embodiment described above, for example, control for performing power interchange between the clusters based on information transmitted from the energy management apparatus (EMS) 11 via the communication network 12 (hereinafter, this control is referred to as “EMS control”). An example of “mode” may also be described. Further, in the above-described second embodiment, the information transmitted from the energy management device (EMS) 11 is not used, and each cluster is based on the voltage change of the common power supply path (for example, the primary DC bus 32). In the above, an example of control for power interchange (hereinafter, this control may be referred to as “local control mode”) has been described.

  In the present embodiment, using the energy management device (EMS) 11, an EMS control mode for performing power interchange based on information acquired from each cluster unit via the communication network 12, and the energy management device (EMS) 11 are used. First, a process of selecting a local control mode for performing power accommodation based on information acquired via a common power supply path based on a predetermined condition will be described.

  Here, the predetermined condition for selecting the EMS control mode and the local control mode is, for example, that the communication state between the control unit of each cluster unit and the energy management device (EMS) 11 via the communication network 12 is normal. Whether or not. For example, each cluster unit selects the EMS control mode when the communication state with the energy management apparatus (EMS) 11 is normal (for example, when communication is possible via the communication network 12). On the other hand, each cluster unit selects the local control mode when the communication state with the energy management apparatus (EMS) 11 is abnormal (for example, when communication via the communication network 12 is not possible).

  Note that when the communication state is abnormal, for example, the energy management device (EMS) 11 may not function due to a disaster or a power failure of the commercial power supply system 2, or the communication network 12 may fail or be congested (failure). By doing so, information cannot be normally communicated between the energy management apparatus (EMS) 11 and each cluster. On the other hand, the case where the communication state is normal is a normal state in which communication via the communication network 12 is possible, for example.

(Procedure for selecting a control mode for power interchange)
FIG. 19 is a flowchart illustrating a procedure of a process for selecting a control mode for power interchange according to the present embodiment. With reference to FIG. 19, an example of the procedure of the control mode selection process will be described.
Here, in the power accommodation system 1 shown in FIG. 1, direct current accommodation (“DC accommodation”) is performed between the parent cluster unit 100, the child cluster unit 200, and the child cluster unit 300 via the primary side DC bus 32. Will be described as an example.

  Each control unit (control unit 110, control unit 210, and control unit 310) of the parent cluster unit 100, the child cluster unit 200, and the child cluster unit 300 confirms the communication state with the energy management apparatus (EMS) 11. (Step S301). For example, the control unit of each cluster unit sends a command for confirming communication connection to the energy management apparatus (EMS) 11 via the communication network 12 and receives a response according to the command, or the The communication status is confirmed based on the time until the response corresponding to the command is received.

  And the control part of each cluster part determines whether the result of having confirmed the communication state is normal (step S302). For example, the control unit of each cluster unit determines that the communication state is normal when a response corresponding to a command for confirming communication connection is received within a specified time via the communication network 12. On the other hand, the control unit of each cluster unit determines that the communication state is abnormal when the response corresponding to the command for confirming the communication connection cannot be received via the communication network 12 within the specified time.

  When it is determined in step S302 that the communication state is normal (step S302: Yes), the control unit of each cluster unit selects the EMS control mode (S303). On the other hand, when it is determined in step S302 that the communication state is abnormal (step S302: No), the control unit of each cluster unit selects the local control mode (S304).

  This control mode selection process is repeatedly executed at predetermined time intervals (for example, every 10 minutes) by the control unit of each cluster unit in the power accommodation system 1, and the control mode of power accommodation corresponding to the communication state is set. Always selected.

  As described above, according to the power accommodation system (for example, the power accommodation system 1) of the present embodiment, by appropriately switching between the EMS control mode and the local control mode according to the communication state, the power accommodation between the clusters is appropriately performed. Can be controlled.

  The embodiment of the present invention has been described above. In the above embodiment, the control unit 110 in the parent cluster unit 100, the control unit 210 in the child cluster unit 200, the control unit 310 in the child cluster unit 300, The control unit 410 in the child cluster unit 400 has a computer system inside. A series of processes related to the above-described process is stored in a computer-readable recording medium in the form of a program, and the above-described process is performed by the computer reading and executing this program. Here, the computer-readable recording medium refers to a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, and the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program. The “computer system” here includes an OS and hardware such as peripheral devices.

  Here, the correspondence between the present invention and the above-described embodiment will be supplementarily described. That is, the power interchange system in the present invention corresponds to the power interchange system 1 shown in FIG. 1 or the power interchange system 1A shown in FIG. Further, the first cluster unit in the present invention corresponds to the parent cluster unit 100 or the parent cluster unit 100A (FIG. 5), and the second cluster unit in the present invention is, for example, the child cluster unit 200 or the child cluster unit 200A (see FIG. 5). 5) corresponds. Moreover, the energy management apparatus (EMS) 11 respond | corresponds to the electric power feeding management part in this invention.

  (1) In the above embodiment, the power accommodation system (for example, the power accommodation system 1) is a power receiving point of the commercial power system 2 and receives the supply of commercial power from the commercial power system 2 (first cluster unit). ), And one or a plurality of child cluster units 200 and 300 (second cluster unit) receiving the supply of commercial power via the parent cluster unit 100 (second cluster unit). In this power interchange system 1, each of the parent cluster unit 100 and the child cluster units 200 and 300 includes a power generation device and a load device, or a power storage device and a load device. The parent cluster unit 100 and the child cluster units 200 and 300 Etc., and between the plurality of child cluster units 200 and 300, etc., power is exchanged with each other via a common feeding path. In the third embodiment, the parent cluster unit 100 and the plurality of child cluster units 200 and 300 and the like have an EMS control mode (an example of a first control mode) and a local control mode (a second control mode). Example) is selected based on a predetermined condition. Here, the EMS control mode is an example of a first control mode for controlling power interchange based on information acquired from the parent cluster unit 100 or the plurality of child cluster units 200 and 300 via the communication network 12. . On the other hand, the local control mode is an example of a second control mode that controls power interchange based on information acquired from the parent cluster unit 100 or the plurality of child cluster units 200 and 300 via the common power supply path. is there.

As described above, according to the power accommodation system (for example, the power accommodation system 1) of the present embodiment, the EMS control mode and the local control mode are configured to be selectable based on the predetermined condition. Depending on (for example, the communication state via the communication network 12), the power interchange between the clusters can be appropriately controlled.
Therefore, according to the present embodiment, it is possible to increase the power use efficiency among a plurality of clusters (customers).

  Note that, as an example of the first control mode, the energy management device (EMS) 11 is configured to transmit power based on information acquired from the parent cluster unit 100 or the plurality of child cluster units 200 and 300 via the communication network 12. Although the EMS control mode for controlling the accommodation has been described, the present invention is not limited to this. For example, as the first control mode, the parent cluster unit 100 or the plurality of child cluster units 200 and 300 via the communication network 12 is used. Based on the acquired information, each control unit of each cluster unit or any one of the control units (for example, the control unit 110 of the parent cluster unit 100) may be in a control mode in which power interchange is controlled.

  (2) The parent cluster unit 100 (first cluster unit) and the child cluster units 200 and 300, etc. (second cluster unit), when the communication state by the communication network 12 is normal as the predetermined condition described above, A control mode (an example of a first control mode) is selected.

  Thereby, in the power accommodation system (for example, power accommodation system 1) of this embodiment, in the case of normal time when each cluster part and the energy management apparatus (EMS) 11 can communicate, from each cluster part to the communication network 12 Based on the information acquired via the network, power interchange between the clusters can be controlled in detail.

  (3) The parent cluster unit 100 (first cluster unit) and the child cluster units 200 and 300 (second cluster unit) are local when the communication state by the communication network 12 is abnormal as the above-mentioned predetermined condition. A control mode (an example of the second control mode) is selected.

  Thereby, in the power accommodation system (for example, the power accommodation system 1) of this embodiment, even if each cluster part and the energy management apparatus (EMS) 11 cannot communicate normally, power is interchanged between each cluster. can do.

  (4) The power accommodation system (for example, the power accommodation system 1) of this embodiment is provided with the energy management apparatus (EMS) 11 (power supply management part). In the EMS control mode, the energy management device (EMS) 11 supplies power to other cluster units among the parent cluster unit 100 (first cluster unit) and the child cluster units 200 and 300 (second cluster unit). Information indicating a possible cluster unit and information indicating a cluster unit that requests power reception from another cluster unit are acquired from each cluster unit. Then, the energy management apparatus (EMS) 11 determines the power between the parent cluster unit 100 and the child cluster units 200 and 300, and between the plurality of child cluster units 200 and 300 based on the acquired information. Control the flexibility of

  Thereby, in the power accommodation system (for example, power accommodation system 1) of this embodiment, in the case of the normal time when each cluster part and the energy management apparatus (EMS) 11 can communicate, it transmitted from each cluster part. By controlling the energy management apparatus (EMS) 11 based on the information, it is possible to control the power interchange between the clusters in detail.

  (5) In the local control mode, the parent cluster unit 100 (first cluster unit) and the child cluster units 200 and 300 (second cluster unit) are connected to the common power supply path (for example, the primary side DC bus 32). By changing the voltage, the interchange of power is controlled based on the change of the voltage.

  As described above, according to the present embodiment, in the local control mode, the cluster units perform power interchange with each other based on a change in the voltage of the common power supply path (for example, the primary side DC bus 32). Power interchange processing can be performed without using information transmitted from the management device (EMS) 11 or information transmitted from the control unit of each cluster unit. For example, when the energy management device (EMS) 11 stops functioning due to a disaster or a power failure of the commercial power supply system 2 or the communication network 12 fails or becomes congested, information is transmitted between the energy management device (EMS) 11 and each cluster. Even if it becomes impossible to transmit / receive the data, it is possible to exchange power between the clusters by selecting the local control mode.

  (6) In the local control mode, the cluster unit capable of supplying power to the other cluster units among the parent cluster unit 100 (first cluster unit) and the child cluster units 200 and 300 (second cluster unit) By supplying power to the common power supply path (for example, the primary side DC bus 32), the voltage of the common power supply path is increased. On the other hand, the other cluster unit described above detects the voltage of the common power supply path, and receives power from the common power supply path when an increase in the voltage of the common power supply path is detected.

  As a result, the cluster unit capable of supplying power supplies the interchangeable power to the cluster unit having a power reception request by increasing the voltage of the common power supply path (for example, the primary DC bus 32). You can be notified. Further, the cluster unit having a power reception request can detect that power can be received from the common power supply path by detecting an increase in the voltage of the common power supply path (for example, the primary side DC bus 32).

  (7) In the local control mode (second control mode), from the other cluster unit among the parent cluster unit 100 (first cluster unit) and the plurality of child cluster units 200 and 300 (second cluster unit). The cluster unit that requests power reception may change the voltage of the common power supply path (for example, the primary DC bus 32) during a predetermined period. In addition, the cluster unit capable of supplying power to other cluster units among the parent cluster unit 100 and the plurality of child cluster units 200 and 300 detects the voltage of the common power supply path during the predetermined period, Based on the result, electric power may be supplied to the common power supply path after the predetermined period. The cluster unit that requests power reception may receive power supplied to the common power supply path after the predetermined period.

  As a result, the cluster unit requiring the interchangeable power can notify the power receiving cluster unit of the power receiving request by changing the voltage of the common power supply path (for example, the primary DC bus 32). it can. In addition, the cluster unit that can supply power can supply the interchanged power to the common power supply path when a power reception request is notified.

  (8) The common power supply path includes a primary AC bus 31 serving as an alternating current power supply path or a primary DC bus 32 serving as a direct current power supply path. In the EMS control mode (an example of the first control mode), AC current or DC power is interchanged. On the other hand, in the local control mode (an example of the second control mode), DC power is interchanged.

  Thus, in the EMS control mode, AC current or DC power can be interchanged via the primary side AC bus 31 or the primary side DC bus 32 based on the control of the energy management device (EMS) 11. On the other hand, in the local control mode (second control mode), the DC power is mutually exchanged between the clusters without using the information transmitted from the energy management apparatus (EMS) 11 or the information transmitted from the control unit of each cluster unit. Can be accommodated.

As mentioned above, although embodiment of this invention was described, the electric power interchange system 1 and the electric power interchange system 1A of this invention are not limited only to the above-mentioned illustration example, The range which does not deviate from the summary of this invention. Of course, various changes can be made.
For example, the power storage device 145 of the parent cluster unit 100 may be provided independently of the parent cluster unit 100. The same applies to the power storage devices of the child cluster unit 200, the child cluster unit 300, and the child cluster unit 400.

  Further, in the second and third embodiments, whether the power reception from the primary DC bus 32 can be started by comparing the voltage of the primary DC bus 32 with a preset threshold value, or The example of determining whether or not it is possible to continue receiving power from the primary side DC bus 32 has been described, but instead of comparing the voltage of the primary side DC bus 32 with a threshold value, the primary side DC bus The above determination may be performed based on the amount of change in the voltage of 32.

  In the third embodiment, the example in which it is determined whether or not there is a power reception request from any cluster unit by comparing the voltage of the primary side DC bus 32 with a preset threshold value has been described. However, instead of comparing the voltage of the primary side DC bus 32 with the threshold value, the above determination may be made based on the amount of change in the voltage of the primary side DC bus 32.

In the power accommodation system 1 (1A) according to the above-described embodiment, the so-called “soft start” control is performed so that the interchanged power is gradually fed at the start of feeding the electricity to be accommodated via the primary DC bus 32. May be performed. For example, a cluster unit that provides power to other cluster units is controlled so as to gradually increase the power supply voltage at a predetermined time at the start of power supply so that the rise of the voltage of the primary DC bus 32 becomes gentle. May be. Further, the cluster unit that accommodates power may be controlled to intermittently supply power at a predetermined time at the start of power supply. Note that the cluster unit that accommodates power may be controlled so as to limit the current value to be fed during a predetermined time at the start of feeding.
In this way, by performing the soft start control, it is possible to suppress the occurrence of an inrush current at the start of power supply that causes a voltage drop of the power supply voltage or power supply stop.

1, 1A ... Power interchange system, 2 ... Commercial power system,
11 ... Energy management device (EMS), 12 ... Communication network,
31 ... Primary side AC bus, 32 ... Primary side DC bus,
100, 100A ... parent cluster part (first cluster part), 102 ... transformer,
200, 200A, 300, 300A ... child cluster part (second cluster part),
110, 210, 310, 410 ... control unit,
121, 221... Bidirectional AC / DC converter
131, 223 ... Bidirectional DC converter,
141 ... power generation device (first power generation device), 142 ... power generation device (second power generation device),
241 ... Power generation device (third power generation device),
242 ... Power generation device (fourth power generation device),
143, 243, 343, 443 ... AC load device,
144, 244, 344, 444 ... DC load device,
145, 245, 345, 445 ... power storage device,
150 ... power conditioner (first power conditioner),
150A ... Power conditioner (second power conditioner),
250 ... power conditioner (third power conditioner),
250A ... power conditioner (fourth power conditioner),
160 ... switching unit (first switching unit), 160A ... switching unit (second switching unit),
260 ... switching unit (third switching unit),
260A ... switching unit (fourth switching unit),
161,261,361,461 ... distribution panel,
162, 262, 362, 462 ... distribution board

Claims (9)

A first cluster unit that serves as a power reception point of the commercial power system and receives supply of commercial power from the commercial power system; and one or a plurality of second cluster units that receive supply of the commercial power via the first cluster unit; A power interchange system comprising:
Each of the first cluster unit and the second cluster unit includes a power generation device and a load device, or a power storage device and the load device,
When power is exchanged between the first cluster unit and the second cluster unit and between the plurality of second cluster units through a common power supply path, the first cluster unit or the A first control mode for controlling power interchange based on information acquired from the second cluster unit via a communication network, and information acquired from the first cluster unit or the second cluster unit via the power supply path And a second control mode for controlling power accommodation based on a predetermined condition, based on a predetermined condition. The first cluster part and the second cluster part are:
The power interchange system according to claim 1, wherein the first control mode is selected when the communication state by the communication network is normal as the predetermined condition. The first cluster part and the second cluster part are:
The power interchange system according to claim 1 or 2, wherein, as the predetermined condition, the second control mode is selected when a communication state by the communication network is abnormal. In the first control mode, of the first cluster unit and the second cluster unit, information indicating a cluster unit that can supply power to another cluster unit and a cluster that requests power reception from the other cluster unit Information indicating a part is acquired from each cluster part, and based on each acquired information, between the first cluster part and the second cluster part, and between the plurality of second cluster parts. Power supply management unit for controlling the interchange of power in
The power interchange system according to any one of claims 1 to 3, further comprising: In the second control mode,
The said 1st cluster part and the said 2nd cluster part control the interchange of electric power based on the change of this voltage by changing the voltage of the said electric power feeding path | route, The any one of Claim 1 to 4 characterized by the above-mentioned. The power interchange system according to claim 1. In the second control mode,
The cluster part capable of supplying power to the other cluster part among the first cluster part and the plurality of second cluster parts increases the voltage of the power supply path by supplying power to the power supply path,
The power interchange system according to claim 5, wherein the other cluster unit detects the voltage of the power supply path and receives power from the power supply path when detecting an increase in the voltage of the power supply path. In the second control mode,
The cluster unit that requests power reception from another cluster unit among the first cluster unit and the plurality of second cluster units changes the voltage of the power supply path in a predetermined period,
The cluster unit capable of supplying power to the other cluster unit among the first cluster unit and the plurality of second cluster units detects the voltage of the power supply path in the predetermined period, and based on the detected result Supplying power to the power supply path after the predetermined period;
The power interchange system according to claim 5, wherein the cluster unit that requests power reception receives power supplied to the power supply path after the predetermined period. The power feeding path includes an AC current feeding path or a DC power feeding path, performs interchange of the AC current or the DC power in the first control mode, and performs the DC power feeding in the second control mode. The power accommodation system according to any one of claims 1 to 7, wherein the electricity accommodation system is performed. A first cluster unit that serves as a power receiving point of the commercial power system and receives commercial power from the commercial power system, and a plurality of second cluster units that receive the commercial power via the first cluster unit In addition, each of the first cluster unit and the second cluster unit is a power interchange method in a power interchange system including a power generation device and a load device, or a power storage device and the load device,
When performing interchange of power between the first cluster unit and the second cluster unit and between the plurality of second cluster units via a common feeding path,
A first control mode for controlling power interchange based on information acquired from the first cluster unit or the second cluster unit via a communication network; and the power supply from the first cluster unit or the second cluster unit. A power accommodation method comprising: selecting, under a predetermined condition, a second control mode for controlling power accommodation based on information acquired via a route.

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