JP2019205224A - Power system and switching device - Google Patents

Abstract

To provide a power system which enables multiple power users to transfer power supplied from a distributed power supply with each other, and a switching device.SOLUTION: A power system S1 comprises: a distributed power supply 1 capable of supplying power; a first power receiving facility 32A which receives power from a power system K and supplies power to a first power load 31A that a first power user has; a second power receiving facility 32B which receives power from the power system K and supplies power to a second power load 31B that a second power user has; and a switching device 2 for switching a first connection state in which power is supplied from the distributed power supply 1 to the first power receiving facility 32A and a second connection state in which power is supplied from the distributed power supply 1 to the second power receiving facility 32B. The switching device 2 switches between the first connection state and the second connection state in accordance with a first power use situation by the first power load 31A and a second power use situation by the second power load 31B.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a power system including a plurality of power receiving facilities each receiving power from a power system, and a switching device used in the power system.

  2. Description of the Related Art Conventionally, a power consumer having a power load installs a distributed power source such as a solar cell or a fuel cell, and a part of the power necessary for the power load is covered by the distributed power source. For example, Patent Document 1 discloses a power system that supplies power to a power load from a distributed power source including a solar power generation device. Thereby, the electric power received from an electric power grid | system can be suppressed and the electric bill of an electric power consumer can be reduced.

Japanese Patent Laying-Open No. 2015-133871

  However, some electric power consumers may not be able to install a distributed power source. For example, if there is no installation space or if the housing strength is insufficient even if there is an installation space, a distributed power source cannot be installed. Such power consumers have been forced to reduce power consumption by suppressing the operation of the power load or stopping the operation in order to suppress the power received from the power system. On the other hand, when reverse power flow is prohibited in power consumers with distributed power sources, it is necessary to suppress power generation to suppress reverse power flow during periods when power consumption due to power load is low. It was. Therefore, even if a distributed power source is installed, it may not be used effectively, for example, because its operating rate is reduced.

  The present disclosure has been devised in view of the above-described problems, and the purpose thereof is an electric power system capable of suppressing power reception from an electric power system of an electric power consumer and also capable of suppressing a decrease in operating rate of a distributed power source, and It is to provide a switching device.

  A power system provided by a first aspect of the present disclosure includes a distributed power source capable of supplying power and power received from a power system and power to a first power load of a first power consumer. A first power receiving facility to be supplied; a second power receiving facility that receives power from a power system and supplies power to a second power load of a second power consumer; and A switching device that switches between a first connection state in which power is supplied to one power receiving facility and a second connection state in which power is supplied from the distributed power source to the second power receiving facility. Is configured to switch between the first connection state and the second connection state according to a first power usage state by the first power load and a second power usage state by the second power load. And According to this configuration, the power supply destination of the distributed power source according to the respective power usage states of the first power load of the first power consumer and the second power load of the second power consumer Is switched between the first power receiving facility and the second power receiving facility. Therefore, the power supplied from the distributed power source can be interchanged between the first power consumer and the second power consumer. As a result, power customers who do not have a distributed power source can suppress power reception from the power system without reducing the power consumption of the power load. The occurrence of reverse power flow can be suppressed without reducing the operating rate of the mold power source.

  In a preferred embodiment of the power system, between the first monitoring device that acquires the first power usage status, the second monitoring device that acquires the second power usage status, and the switching device. A switching instruction unit that is communicable and instructs the switching device to switch between the first connection state and the second connection state; and the switching instruction unit includes the first monitoring device. A switching instruction signal for switching between the first connection state and the second connection state according to the first power usage state acquired by the second monitoring device and the second power usage state acquired by the second monitoring device. The switching device switches between the first connection state and the second connection state based on the switching instruction signal received from the switching instruction unit. According to this configuration, the switching device performs switching between the first connection state and the second connection state in accordance with an instruction from the switching instruction unit. Therefore, power interchange between the first power consumer and the second power consumer can be controlled by a switching instruction unit different from the switching device.

  In a preferred embodiment of the power system, the power management system further includes an integrated management device having the switching instruction unit and capable of communicating with the first monitoring device and the second monitoring device. The first power usage status is received from the first monitoring device, and the second power usage status is received from the second monitoring device, and the switching instruction unit receives the first power usage status received from the first monitoring device. The switching instruction signal is generated based on the power usage status and the second power usage status. According to this configuration, the switching instruction signal for switching between the first connection state and the second connection state is generated by the switching instruction unit included in the integrated management apparatus. Therefore, the integrated management apparatus receives the first power usage status and the second power usage status, and generates a switching instruction signal based on these. Then, the generated switching instruction signal is transmitted to the switching device. Accordingly, the switching device performs switching between the first connection state and the second connection state based on the received switching instruction signal. Therefore, the integrated management apparatus can collectively control power interchange between the first power consumer and the second power consumer.

  In a preferred embodiment of the power system, when the switching device is in the first connection state, the predicted demand at the end of the demand time period is based on a contract with a power provider in the second power consumer. When the predicted demand at the end of the demand time period when the first power consumer exceeds the contract demand and the second connection state is set does not exceed the contract demand based on the contract with the power provider, Switch to the second connection state. For example, in the second electric power consumer who does not have a distributed power source, in order to prevent the electric power demand from exceeding the contract demand, conventionally, it has been necessary to stop or suppress the operation of the second electric power load. However, according to this configuration, in the second power consumer, the predicted demand exceeds the contract demand, and in the first power consumer, the predicted demand exceeds the contract demand even if there is no power supply from the distributed power source. When not exceeding, it can switch to the state which supplies electric power to a 2nd power receiving installation from a distributed power supply. Therefore, it is possible to prevent the power demand from exceeding the contract demand without stopping the operation or suppressing the operation of the second power load.

  In a preferred embodiment of the power system, when the switching device is in the first connection state, in the first power consumer, the power received from the power system is equal to or less than a first threshold value, and In the 2nd electric power consumer, when the electric power received from the electric power system at the time of the 2nd connection state is larger than the 2nd threshold, it switches to the 2nd connection state. For example, when the first power consumer having a distributed power source is a grid interconnection without reverse power flow, conventionally, power supply from the distributed power source has been suppressed so as not to generate reverse power flow. “Grid connection” indicates that power generation equipment is connected to the power system of the power company and its state. “Grid connection without reverse power flow” refers to distribution even if the grid is connected. This is the case where power is not sent to the electric wire. However, according to this configuration, for example, values larger than 0 are set as the first threshold value and the second threshold value, and in the first power consumer, the power received from the power system is equal to or lower than the first threshold value, and In the second power consumer, when the power received from the power system is larger than the second threshold value even when power is supplied from the distributed power source, the power consumer is switched to the state of supplying power from the distributed power source to the second power receiving facility. Can do. Therefore, it is possible to suppress the occurrence of reverse power flow in the first power consumer without suppressing power generation by the distributed power source.

  In a preferred embodiment of the power system, when the switching device switches between the first connection state and the second connection state, the power supplied from the distributed power source is the first power receiving facility and the first power source. 2 through a non-connected state that is not supplied to any of the power receiving facilities. When the first connection state and the second connection state are switched instantaneously, the first power receiving facility and the second power receiving facility may be electrically connected. In this case, by loop connection through the power system Causes a short circuit accident. However, according to this configuration, when switching between the first connection state and the second connection state, the non-connection state is interposed, so that the first power receiving facility and the second power receiving facility are prevented from being electrically connected. it can. Therefore, the occurrence of the short circuit accident can be suppressed.

  In a preferred embodiment of the power system, the power system further includes a third power receiving facility that receives power from the power system and supplies power to a third power load of a third power consumer, The switching device can also be switched to a third connection state in which power is supplied from the distributed power source to the third power receiving facility. According to this configuration, the power supplied from the distributed power source can be interchanged among three or more power consumers.

  The power system provided by the second aspect of the present disclosure is a first in which a distributed power source capable of supplying power and one or more first power consumer facilities installed in a first demand area are connected. Power, a second power network to which one or more second power customer facilities installed in the second demand area are connected, and a first power network that supplies power from the distributed power source to the first power network. A switching device that switches between a first connection state and a second connection state in which power is supplied from the distributed power source to the second power grid, and the switching device includes a first switching device in the first demand area. The first connection state and the second connection state are switched according to the power use state of the second and the second power use state in the second demand area. According to this configuration, the power supply destination of the distributed power source is connected to the first power network and the second power source according to the first power usage situation in the first demand area and the second power usage situation in the second demand area. Switch to and from the power grid. Therefore, electric power can be interchanged between the first demand area and the second demand area.

  The switching device provided by the third aspect of the present disclosure includes a first connection state in which power is supplied to a first power receiving facility from a distributed power source capable of supplying power, and a second power receiving facility from the distributed power source. A switch that can switch between a second connection state in which power is supplied to the power supply, and a switching control unit that controls the switch and switches between the first connection state and the second connection state. The first power receiving facility receives power from a power system and supplies power to a first power load of a first power consumer, and the second power receiving facility receives power from the power system. , And supplying power to the second power load of the second power consumer, the switching control unit is configured to use the first power usage state by the first power load and the second power load. According to the second power usage status by the power load, the first connection state and And switches the serial second connection state. According to this configuration, the power supply destination of the distributed power source according to the respective power usage states of the first power load of the first power consumer and the second power load of the second power consumer Can be switched between the first power receiving facility and the second power receiving facility. Therefore, the power supplied from the distributed power source can be interchanged between the first power consumer and the second power consumer.

  The switching device provided by the fourth aspect of the present disclosure includes a first connection state in which power is supplied from a distributed power source capable of supplying power to the first power network, and power from the distributed power source to the second power network. And a switching control unit that controls the switching unit and switches between the first connection state and the second connection state. One power network is connected to one or more first power consumer facilities installed in a first demand area, and the second power network is one or more first power networks installed in a second demand area. 2 electric power consumer equipment is connected, the switching control unit according to the first power usage situation in the first demand place and the second power usage situation in the second demand place, Switching between the first connection state and the second connection state . According to this configuration, according to the first power usage situation in the first demand area and the second power usage situation in the second demand area, the power supply destination of the distributed power source is set to the first power network and the second power source. You can switch to and from the power grid. Therefore, electric power can be interchanged between the first demand area and the second demand area.

  According to the power system and the switching device of the present disclosure, by interchanging the power supplied from the distributed power source among a plurality of power consumers, it is possible to suppress power reception from the power system of each power consumer, In addition, it is possible to suppress a decrease in the operating rate of the distributed power source.

  Other features and advantages of the power system and switching device of the present disclosure will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a figure showing the whole electric power system composition concerning a 1st embodiment. It is a figure which shows the detailed structure of the electric power system concerning 1st Embodiment. It is a flowchart which shows the 1st switching instruction | indication signal production | generation process which an integrated management apparatus performs. It is a flowchart which shows the 2nd switching instruction | indication signal production | generation process which an integrated management apparatus performs. It is a figure which shows the whole structure of the electric power system concerning the modification of 1st Embodiment. It is a figure which shows the whole structure of the electric power system concerning the modification of 1st Embodiment. It is a figure which shows the detailed structure of the electric power system concerning 2nd Embodiment. It is a figure which shows the whole structure of the electric power system concerning 3rd Embodiment. It is a figure which shows the whole structure of the electric power system concerning 4th Embodiment.

  A preferred embodiment of a power system and a switching device according to the present disclosure will be described below with reference to the drawings.

  1 and 2 show a power system according to a first embodiment of the present disclosure. The power system S1 of the first embodiment includes a distributed power source 1, a switching device 2, a plurality of power customer facilities 3, and an integrated management device 4. In this embodiment, the case where 3 A of 1st electric power consumer equipments and the 2nd electric power consumer equipment 3B are provided as several electric power consumer equipment 3 is demonstrated.

  FIG. 1 shows the overall configuration of the power system S1. FIG. 2 shows a detailed configuration of the power system S1. In these drawings, a solid line indicates a power path, and a solid line with an arrow indicates a communication path.

  As shown in FIGS. 1 and 2, in the power system S1, the distributed power source 1, the switching device 2, and the first power consumer facility 3A are installed in the building A owned by the first power consumer. Yes. Moreover, the 2nd electric power consumer equipment 3B is installed in the building B which the 2nd electric power consumer owns. Further, the first power consumer facility 3 </ b> A and the second power consumer facility 3 </ b> B are connected by a power line 5 between power consumers.

  Further, as shown in FIG. 1, in the power system S1, the distributed power source 1, the switching device 2, the first power consumer facility 3A, the second power consumer facility 3B, and the integrated management device 4 are respectively connected to a communication network. 91.

  The distributed power source 1 generates power and supplies the generated power to either the first power consumer facility 3A or the second power consumer facility 3B. In this embodiment, a solar power generation device will be described as an example of the distributed power source 1. The distributed power source 1 includes a power generator 11 and a power conditioner 12.

  The power generation device 11 includes a solar cell, and generates direct-current power by converting solar energy into electric energy by the solar cell. Then, the generated DC power is output to the power conditioner 12.

  The power conditioner 12 performs various controls of the distributed power source 1. The power conditioner 12 converts, for example, power generated by the power generation device 11 into power having characteristics suitable for the first power consumer facility 3A and the second power consumer facility 3B. In the present embodiment, the power conditioner 12 includes an inverter circuit. The inverter circuit converts DC power input from the power generator 11 into AC power. In addition, the power conditioner 12 includes a transformer that boosts (or steps down) the AC voltage input from the inverter circuit, a control circuit that controls the inverter circuit, and the like.

The power conditioner 12 includes a communication unit 121 and a power detection unit 122. The communication unit 121 performs communication with the integrated management device 4. Communication between the communication unit 121 and the integrated management apparatus 4 may be wireless communication or wired communication. The power detection unit 122 detects the power output from the distributed power source 1. The power detection unit 122 transmits the detected output power value P _PV from the distributed power source 1 to the integrated management device 4 via the communication unit 121.

In the distributed power source 1, the output power value P _PV detected by the power detection unit 122 may be displayed on a display unit (not shown) (for example, a liquid crystal monitor).

  In the present embodiment, the solar power generation device has been described as an example of the distributed power source 1. However, the present invention is not limited to this. It may be configured to include a plurality of these. Further, when the distributed power source 1 is such, the power generation device 11 may not generate DC power but may generate AC power. Note that, depending on the power generation device 11, a control unit including the communication unit 121 and the power detection unit 122 may be used instead of the power conditioner 12.

  The switching device 2 selectively switches whether the power generated by the distributed power source 1 is supplied to the first power consumer facility 3A or the second power consumer facility 3B. The switching device 2 is disposed on a power consumer power line 5 that connects the first power consumer facility 3A and the second power consumer facility 3B. The switching device 2 includes a switching device 21 and a switching control unit 22.

  The switch 21 switches to one of a plurality of connection states. In the present embodiment, the switch 21 is a DT (Double Throw) type switch. In the present embodiment, there are three connection states, a first connection state, a second connection state, and a no connection state.

  The first connection state is a state in which the distributed power source 1 and the first power consumer facility 3A are conducted and the distributed power source 1 and the second power consumer facility 3B are cut off. Therefore, in the first connection state, the first power consumer facility 3A is selected as the supply destination of the output power from the distributed power source 1, and the output power from the distributed power source 1 is the first power consumer. Supplied to the facility 3A.

  The second connection state is a state where the distributed power source 1 and the first power consumer facility 3A are cut off and the distributed power source 1 and the second power consumer facility 3B are conducted. Therefore, in the second connection state, the second power consumer facility 3B is selected as the supply destination of the output power from the distributed power source 1, and the output power from the distributed power source 1 is the second power consumer facility. 3B.

  The unconnected state is a state in which the distributed power source 1 is disconnected from both the first power consumer facility 3A and the second power consumer facility 3B. Accordingly, in the non-connected state, neither the first power consumer facility 3A nor the second power consumer facility 3B is selected as the supply destination of the output power from the distributed power source 1, and the output from the distributed power source 1 Electric power is not supplied to the first power consumer facility 3A or the second power consumer facility 3B.

  The switch 21 has, for example, four contacts c0, c1, c2, and c3 as shown in FIG. A distributed power source 1 is connected to the contact c0. The first power consumer facility 3A is connected to the contact c1. A second power consumer facility 3B is connected to the contact c2. And nothing is connected to the contact c3. In such a switching device 21, when the contact c0 and the contact c1 are in a conductive state, the first connection state is established. When the contact c0 and the contact c2 are in a conduction state, the second connection state is established, and the contacts c0 and c3 are connected. When in the conductive state, it becomes a non-connected state. FIG. 2 shows a case of the first connection state in which the contact point c0 and the contact point c1 are in a conductive state. The configuration of the switch 21 is not limited to the above as long as the first connection state, the second connection state, and the non-connection state can be switched.

  The switching control unit 22 switches the switching device 21. The switching control unit 22 includes a communication unit 221 as illustrated in FIG. The communication unit 221 communicates with the integrated management device 4. Note that the communication between the communication unit 221 and the integrated management device 4 may be wireless communication or wired communication.

  The switching control unit 22 receives a switching instruction signal from the integrated management device 4 via the communication unit 221 and switches the switch 21 based on the received switching instruction signal. The switching instruction signal is a signal for instructing switching of the switch 21. When the received switching instruction signal instructs the switching from the first connection state to the second connection state, the switching control unit 22 switches the switch 21 from the first connection state to the non-connection state, Switch from the non-connection state to the second connection state. In addition, the switching control unit 22 switches the switch 21 from the second connection state to the non-connection state when the received switching instruction signal instructs to switch from the second connection state to the first connection state. Later, the connection state is switched from the non-connection state to the first connection state. That is, the switching control unit 22 passes through the non-connection state when switching between the first connection state and the second connection state. The switching control unit 22 receives the switching instruction signal instructing switching to the first connection state when the switch 21 is in the first connection state and when the switch 21 is in the second connection state. When the switching instruction signal for instructing switching to the connected state is received, the switching unit 21 is not particularly switched.

  The switching control unit 22 transmits a connection state signal indicating the current connection state of the switch 21 to the integrated management device 4 via the communication unit 221.

  Both the first power consumer facility 3A and the second power consumer facility 3B are connected to the power grid K and can receive power from the power grid K. Note that the first power consumer facility 3A and the second power consumer facility 3B are connected to the power grid K at different positions. The first power consumer facility 3A is a facility owned by the first power consumer. The second power consumer facility 3B is a facility owned by the second power consumer. The first power customer facility 3A can receive the output power from the distributed power source 1 when the switch 21 is in the first connection state. The second power consumer facility 3B can receive the output power from the distributed power source 1 when the switch 21 is in the second connection state. The first power customer facility 3A includes a power load 31A, a power receiving facility 32A, and an energy management system 33A. The second power customer facility 3B includes a power load 31B, a power receiving facility 32B, and an energy management system 33B. In the following description, the energy management system is referred to as “EMS”.

  The power loads 31A and 31B both consume power. Each of the power loads 31A and 31B is, for example, various electric devices installed in a general household, a factory, a commercial facility, or the like. The power load 31A is supplied with power from the power receiving facility 32A. The power load 31B is supplied with power from the power receiving facility 32B.

  Both the power receiving facilities 32A and 32B are configured to include a distribution board and a distribution board. Each of the power receiving facilities 32A and 32B receives power supplied from the power system K and the distributed power source 1. The power receiving facility 32A supplies the received power to the power load 31A. When receiving power from the distributed power source 1, the power receiving facility 32 </ b> A supplies the power from the distributed power source 1 to the power load 31 </ b> A with priority over the power from the power system K. As shown in FIG. 2, the power receiving facility 32 </ b> A includes a power detection unit 321 </ b> A. The power receiving facility 32B supplies the received power to the power load 31B. When receiving power from the distributed power source 1, the power receiving facility 32 </ b> B supplies the power from the distributed power source 1 to the power load 31 </ b> B with priority over the power from the power system K. The power receiving facility 32B includes a power detection unit 321B as illustrated in FIG.

  The power detection unit 321A detects various types of power in the first power consumer facility 3A. In the present embodiment, the power detection unit 321A includes power consumed by the power load 31A (power consumption), power supplied from the distributed power source 1 via the switching device 2 (supply power), and the power system K. The power to be received (received power) is detected. The power detection unit 321A detects power consumption, for example, by detecting power supplied from the power receiving facility 32A to the power load 31A. The power detection unit 321A outputs the detected power consumption value P1a, supply power value P2a, and received power value P3a to the EMS 33A. The power detection unit 321B detects various types of power in the second power consumer facility 3B. The power detection unit 321B is configured similarly to the power detection unit 321A. The power detection unit 321B outputs the detected power consumption value P1b, supply power value P2b, and received power value P3b to the EMS 33B.

  The EMS 33A manages the demand and supply of various types of power in the first power consumer facility 3A. The EMS 33B manages the demand and supply of various types of power in the second power consumer facility 3B. The EMSs 33A and 33B are, for example, a system called HEMS (Home Energy Management System) if the buildings A and B are ordinary homes, and are called BEMS (Building Energy Management System) if the buildings A and B are buildings. If the buildings A and B are factories, this is a system called FEMS (Factory Energy Management System).

  The EMS 33A receives the power consumption value P1a, the supplied power value P2a, and the received power value P3a from the power detection unit 321A. The EMS 33A displays the input power consumption value P1a, supply power value P2a, and received power value P3a on, for example, a display device (not shown), so that the first power consumer can confirm these power values. As shown in FIG. 2, the EMS 33A has a communication unit 331A. The communication unit 331A performs communication with the integrated management device 4. Note that the communication between the communication unit 331A and the integrated management apparatus 4 may be wireless communication or wired communication. In the present embodiment, the EMS 33A transmits the power consumption value P1a, the supplied power value P2a, and the received power value P3a to the integrated management device 4 via the communication unit 331A. The EMS 33A corresponds to the “first monitoring device” recited in the claims.

  The EMS 33B is configured similarly to the EMS 33A. As shown in FIG. 2, the EMS 33B has a communication unit 331B. The communication unit 331B is configured similarly to the communication unit 331A. The EMS 33B receives the power consumption value P1b, the supplied power value P2b, and the received power value P3b from the power detection unit 321B, and transmits these power values to the integrated management device 4 via the communication unit 331B. The EMS 33B corresponds to a “second monitoring device” recited in the claims.

  The integrated management device 4 manages the distributed power source 1, the switching device 2, the first power consumer facility 3A, and the second power consumer facility 3B. The integrated management device 4 includes a management control unit 41 as shown in FIG.

  The management control unit 41 performs various controls of the integrated management device 4. The management control unit 41 includes a communication unit 411 as illustrated in FIG. The communication unit 411 communicates with the distributed power source 1, the switching device 2, the first power consumer facility 3A (EMS33A), and the second power consumer facility 3B (EMS33B). Note that the communication unit 411 and communication between them may be wireless communication or wired communication. The management control unit 41 communicates with the distributed power source 1, the switching device 2, the first power consumer facility 3A (EMS33A), and the second power consumer facility 3B (EMS33B) via the communication unit 411. Send and receive various signals.

The management control unit 41 receives the output power value P _PV from the distributed power source 1 via the communication unit 411. Further, the management control unit 41 receives the power consumption value P1a, the supply power value P2a, and the received power value P3a from the EMS 33A via the communication unit 411, and receives the power consumption value P1b, the supply power value P2b, and the received power value from the EMS 33B. P3b is received. The management control unit 41 generates a switching instruction signal for switching the connection state of the switch 21 based on these received power values. Then, the management control unit 41 transmits the generated switching instruction signal to the switching device 2 via the communication unit 411. Thereby, the switching apparatus 2 switches the connection state of the switch 21 based on the received switching instruction signal. In the present embodiment, the management control unit 41 corresponds to a “switching instruction unit” recited in the claims.

  FIG. 3 and FIG. 4 are flowcharts showing the generation process of the switching instruction signal performed by the management control unit 41. FIG. 3 shows a switching instruction signal generation process (first switching instruction signal when the switching device 2 is switched so that the power demand does not exceed the contract demand in the first power consumer and the second power consumer. Generation process). FIG. 4 shows the reverse power flow in the first power consumer equipment 3A and the second power consumer equipment 3B when the first power consumer and the second power consumer are connected to the grid without reverse power flow. This shows a switching instruction signal generation process (second switching instruction signal generation process) when switching the switching device 2 so as not to occur. The “system interconnection” indicates that the power generation facility (distributed power source 1) is connected to the power system K and the state thereof, and the “system interconnection without reverse power flow” is the system interconnection. In this case, power is not sent to the distribution line. On the other hand, “system interconnection with reverse power flow” refers to a case where electric power is sent to a distribution line. In the present embodiment, the management control unit 41 shows a case where both the first switching instruction signal generation process (see FIG. 3) and the second switching instruction signal generation process (see FIG. 4) are performed, but only one of them is performed. It may be. Further, when both of these switching instruction signal generation processes are performed, these switching instruction signal generation processes may be repeatedly performed in parallel, or may be alternately performed one by one.

  First, the first switching instruction signal generation process shown in FIG. 3 will be described. The management control unit 41 uses the following power demand values in order to perform the first switching instruction signal generation process. That is current demand, forecast demand and contract demand. The power demand is the average demand power for each demand period (generally 30 minutes). In the present embodiment, the power demand is average demand power per demand time period, but may be cumulative demand power per demand time period.

  The current demand is the current value of the power demand in the current demand time period. Based on the power consumption value P1a, the supplied power value P2a, and the received power value P3a received from the first power consumer facility 3A (EMS33A), the management control unit 41 determines the current demand for the first power consumer facility 3A ( First current demand) is calculated. In the present embodiment, the management control unit 41 calculates the first current demand by calculating the average value (or integrated value) of the received power value P3a received so far in the current demand time period. The first current demand calculation method is not limited to this. For example, the received power value P3a can be estimated from a value obtained by subtracting the supplied power value P2a from the consumed power value P1a. Similarly, the management control unit 41 uses the second power consumer facility based on the power consumption value P1b, the supplied power value P2b, and the received power value P3b received from the second power consumer facility 3B (EMS33B). The current demand (second current demand) for 3B is calculated.

The predicted demand is a predicted value of the power demand at the end of the current demand period. A known method may be used as a method for calculating the predicted demand. Management control unit 41, first the current demand power value P1a, supply power value P2a, based on the received power value P3a and output power values P _PV, predicted demand (first prediction for the first electric power consumer equipment 3A Demand). In the present embodiment, the management control unit 41 does not supply power from the distributed power source 1 to the first power consumer facility 3A during the period from the current demand period to the end of the current demand period. As a result, the first predicted demand is calculated. That is, in the period, the first predicted demand is calculated as being in the second connection state. The management control unit 41, similarly, a second current demand, the power consumption value P1b, supply power value P2b, based on the received power value P3b and output power values P _PV, prediction for the second power customer facilities 3B Demand (second predicted demand) is calculated. In the present embodiment, the management control unit 41 does not supply power from the distributed power source 1 to the second power consumer facility 3B during the period from the current demand time limit to the end of the current demand time limit. As a result, the second predicted demand is calculated. That is, in the period, the second predicted demand is calculated as being in the first connection state.

  The contract demand is the maximum value of the power demand value determined in each of the first power consumer facility 3A and the second power consumer facility 3B based on the contract with the power provider. In the management control unit 41, a first contract demand for the first power consumer equipment 3A and a second contract demand for the second power consumer equipment 3B are preset.

  First, the management control unit 41 determines whether or not the second predicted demand exceeds the second contract demand (S11). That is, it is determined whether power supply from the distributed power source 1 is necessary in the second power consumer facility 3B.

  When it determines with not exceeding in step S11 (S11: NO), ie, when it determines with the electric power supply from the distributed power source 1 not being required in the 2nd electric power consumer equipment 3B, the switch 21 is 1st. A switching instruction signal is generated so as to be connected (S12). On the other hand, when it determines with exceeding in step S11 (S11: YES), ie, when it determines with the power supply from the distributed power supply 1 being required in the 2nd electric power consumer equipment 3B, the management control part 41 Subsequently, it is determined whether or not the first predicted demand exceeds the first contract demand (S13). That is, it is determined whether or not power supply from the distributed power source 1 is necessary in the first power consumer facility 3A.

  When it determines with exceeding in step S13 (S13: YES), ie, when it determines with the electric power supply from the distributed power source 1 being required in 3 A of 1st electric power consumer facilities, the switch 21 is 1st. A switching instruction signal is generated so as to be connected (S12). In addition, the management control part 41 produces | generates the switching instruction | indication signal which makes the switch 21 a 1st connection state, when it determines with exceeding in step S13, and with respect to 2nd electric power consumer equipment 3B as needed. You may instruct as follows. That is, an instruction for notifying a notification means (not shown) provided in the second power consumer facility 3B to reduce the power consumption of the power load 31B and an instruction for stopping a part of the power load 31B. On the other hand, when it determines with not exceeding in step S13 (S13: NO), ie, when it determines with the electric power supply from the distributed power source 1 not being required in 3 A of 1st electric power consumer facilities, the switch 21 is. A switching instruction signal is generated so as to be in the second connection state (S14).

  In the present embodiment, the case where the management control unit 41 calculates each power demand (current demand and predicted demand) has been shown. However, each EMS 33A, 33B calculates each power demand and transmits it to the management control unit 41. You may make it do.

Next, the second switching instruction signal generation process shown in FIG. 4 will be described. As described above, the second switching instruction signal generation process is performed when both the first power consumer facility 3A and the second power consumer facility 3B are connected to the grid without reverse power flow. The management control unit 41 uses the received power values P3a ′ and P3b ′ shown below to perform the second switching instruction signal generation process. Received power value P3a 'is, for example, a value obtained by subtracting the output power value P _PV from the power consumption value P1a, receiving power when providing power from the dispersed type power supply 1 to the first power customer facilities 3A This is a calculated value of the value P3a. That is, the received power value P3a ′ is a calculated value of the received power value P3a in the first connection state. Therefore, when the switch 21 is in the first connection state, the received power value P3a ′ calculated by the management control unit 41 and the received power value P3a detected by the power detection unit 321A are the same. The received power value P3b ′ is calculated in the same way. That is, the received power value P3b 'is, for example, a value obtained by subtracting the output power value P _PV from power value P1b, when providing power from the dispersed type power supply 1 to the second power customer facilities 3B This is a calculated value of the received power value P3b. That is, the received power value P3b ′ is a calculated value of the received power value P3b in the second connection state. Therefore, when the switch 21 is in the second connection state, the received power value P3b ′ calculated by the management control unit 41 and the received power value P3b detected by the power detection unit 321B are the same.

  First, the management control unit 41 determines whether or not the received power value P3a ′ in the first power consumer facility 3A is equal to or less than a first threshold value (S21). Thereby, it is determined whether there is a possibility that a reverse power flow may occur in the first electric power consumer equipment 3A. For example, a value of 0 or more is set as the first threshold. When the first threshold value is close to 0, it is less likely that it is determined in step S21 that a reverse power flow may occur in the first electric power consumer equipment 3A. In S21, there is a high possibility that it is determined that there is a possibility that a reverse power flow may occur in the first power consumer equipment 3A. The first threshold is appropriately set by the first power consumer.

  When it is determined in step S21 that the received power value P3a ′ is greater than the first threshold (not less than the first threshold) (S21: NO), that is, a reverse power flow may occur in the first power consumer equipment 3A. If it is determined that there is not, the management control unit 41 generates a switching instruction signal so that the switch 21 is in the first connection state (S22). On the other hand, when it is determined in step S21 that the received power value P3a ′ is equal to or less than the first threshold value (S21: YES), that is, it is determined that there is a possibility that a reverse power flow may occur in the first power consumer equipment 3A. When it does, the management control part 41 determines whether the said received electric power value P3b 'in the 2nd electric power consumer equipment 3B is below a 2nd threshold value next (S23). Thereby, it is determined whether or not there is a possibility that a reverse power flow may occur in the second power consumer facility 3B when power is supplied from the distributed power source 1 to the second power consumer facility 3B. . For example, a value of 0 or more is set as the second threshold. When the second threshold value is close to 0, it is less likely that it is determined in step S23 that a reverse power flow may occur in the second electric power consumer equipment 3B, while the larger the second threshold value, the higher the step value. In S23, there is a high possibility that it is determined that there is a possibility that a reverse power flow may occur in the second power consumer facility 3B. The second threshold is appropriately set by the second power consumer. Note that the first threshold value and the second threshold value may be the same or different. The first threshold value and the second threshold value are the degree of suppression of the occurrence of reverse power flow in the first power consumer equipment 3A and the second power consumer equipment 3B, and the first power consumer equipment 3A What is necessary is just to set suitably considering the frequency of switching with the 2nd electric power consumer equipment 3B.

  When it is determined in step S23 that the received power value P3b ′ is greater than the second threshold (not less than the second threshold) (S23: NO), that is, a reverse power flow may occur in the second power consumer facility 3B. When it determines with there being no, the management control part 41 produces | generates a switching instruction | indication signal so that the switch 21 may be in a 2nd connection state (S24). On the other hand, when it is determined in step S23 that the received power value P3b ′ is equal to or smaller than the second threshold (S23: YES), that is, it is determined that there is a possibility that a reverse power flow may occur in the second power consumer facility 3B. In this case, the management control unit 41 generates a switching instruction signal so that the switch 21 is in the first connection state, and suppresses the output power to the distributed power source 1, that is, by the power generation device 11. An instruction is given to suppress power generation (S25).

  The first switching instruction signal generation process (see FIG. 3) and the second switching instruction signal generation process (see FIG. 4) are not limited to those described above, and the switching instruction signal may be generated by other methods. .

  Next, the operation and effect of the power system S1 according to the first embodiment will be described.

  According to the power system S1, the power supply destination of the distributed power source 1 depends on the power usage statuses of the power load 31A of the first power consumer and the power load 31B of the second power consumer. Switching is performed between the power receiving facility 32A and the power receiving facility 32B. Therefore, the electric power supplied from the distributed power source 1 can be interchanged between the first electric power consumer and the second electric power consumer. For example, since the distributed power source cannot be individually installed in the building B, the second power consumer equipment 3B in the building B cannot conventionally suppress the received power from the power system K by the distributed power source. However, according to the power system S1, since the power supply from the distributed power source 1 installed in the building A can be performed from the building A to the building B, in the second power consumer equipment 3B in the building B However, the received power from the power system K by the distributed power source can be suppressed as necessary. In addition, in the first power consumer equipment 3A in the building A, there is a possibility that a reverse power flow may occur, and when power supply from the distributed power source 1 is unnecessary, conventionally, power generation of the distributed power source 1 has to be suppressed. Did not get. However, according to the power system S1, since it is not necessary to suppress the power generation of the distributed power source 1, it is possible to suppress a decrease in the operating rate of the distributed power source 1.

  According to the power system S1, the integrated management device 4 acquires the power consumption value P1a, the supplied power value P2a, and the received power value P3a from the first power consumer facility 3A, and based on these, the first power demand The power usage status in the home equipment 3A is confirmed. Moreover, the power consumption value P1b, the supplied power value P2b, and the received power value P3b are acquired from the second power consumer facility 3B, and based on these, the power usage status in the second power consumer facility 3B is confirmed. And the integrated management apparatus 4 is controlling switching of the switching apparatus 2 according to these electric power usage conditions. Therefore, the integrated management device 4 can control power interchange between the first power consumer and the second power consumer.

  According to the power system S1, the management control unit 41 generates a switching instruction signal according to the first switching instruction signal generation process (see FIG. 3). As a result, when the switch 21 is in the first connection state, the second predicted demand exceeds the second contract demand in the second power consumer that does not have the distributed power source, and the distributed power source If the first predicted demand does not exceed the first contract demand, the switch 21 can be switched to the second connection state. That is, the power supply destination of the distributed power source 1 can be the second power consumer facility 3B. Therefore, it is possible to suppress the power peak of the second power consumer facility 3B and prevent the power demand from exceeding the contract demand in the second power consumer.

  According to the power system S1, the management control unit 41 performs the first switching instruction signal generation process, so that when the switch 21 is in the first connection state, the second predicted demand is generated in the second power consumer facility 3B. If the first predicted demand does not exceed the first contract demand even if the second contract demand is exceeded and the first power consumer facility 3A does not supply power from the distributed power source 1, the distributed power source The supply destination of the power generated by 1 is switched from the first power consumer facility 3A to the second power consumer facility 3B. When it is determined that the first predicted demand exceeds the first contract demand in the first power consumer equipment 3A when the switch 21 is in the second connection state, the supply destination of the distributed power source 1 is the second. The power customer facility 3B is switched to the first power customer facility 3A. Further, when it is determined that the second predicted demand does not exceed the second contract demand in the second power consumer facility 3B when the switch 21 is in the second connection state, the supply destination of the distributed power source 1 is the first. The second power consumer facility 3B is switched to the first power consumer facility 3A. Therefore, appropriately controlling power interchange between the first power consumer and the second power consumer so as to suppress the received power of the first power consumer and the second power consumer as much as possible. Can do.

  According to the power system S1, the management control unit 41 generates the switching instruction signal according to the second switching instruction signal generation process (see FIG. 4). As a result, when the first power consumer equipment 3A having the distributed power source 1 is connected to the grid without reverse power flow, the switch 21 is connected to the first connection when the switch 21 is in the first connection state. If a reverse power flow is likely to occur in the first power consumer facility 3A and no reverse power flow occurs in the second power consumer facility 3B, the power supply destination of the distributed power source 1 is set to the second power. The customer facility 3B can be obtained. Therefore, generation | occurrence | production of the reverse power flow in 3 A of 1st electric power consumer facilities can be suppressed, suppressing the electric power which the electric power generating apparatus 11 generated as much as possible. In the case of grid interconnection without reverse power flow, a reverse power relay is installed to prevent reverse power flow to the power system K. The reverse power relay is a protective relay that disconnects each power consumer facility 3 from the power system K when a reverse power flow is detected. When the reverse power relay is activated, each power customer facility 3 is disconnected from the power system K and cannot receive power from the power system K. Therefore, it can suppress that it is disconnected by a reverse power relay by suppressing generation | occurrence | production of the reverse power flow in each electric power consumer equipment 3. FIG.

  According to the power system S1, the management control unit 41 performs the second switching instruction signal generation process, so that a reverse power flow is likely to occur in the first power consumer equipment 3A when the switch 21 is in the first connection state. If a reverse power flow does not occur in the second power consumer facility 3B even if power is supplied from the distributed power source 1 to the second power consumer facility 3B, the supply destination of the distributed power source 1 is The first power customer facility 3A is switched to the second power customer facility 3B. When it is determined that there is a possibility that reverse power flow may occur in the second power consumer facility 3B when the switch 21 is in the second connection state, the supply destination of the distributed power source 1 is the second power demand. The home equipment 3B is switched to the first power consumer equipment 3A. Furthermore, when it is determined that there is no risk of reverse power flow in the first power consumer facility 3A when the switch 21 is in the second connection state, the supply destination of the distributed power source 1 is the second power demand. The home equipment 3B is switched to the first power consumer equipment 3A. Therefore, it is possible to appropriately control power interchange between the first power consumer and the second power consumer so as not to suppress power generation of the distributed power source 1 as much as possible.

  According to the power system S1, the switch 21 is in the non-connection state when switching between the first connection state and the second connection state. If the first connection state and the second connection state are instantaneously switched in the switch 21, there is a possibility that the contact c <b> 1 and the contact c <b> 2 are electrically connected due to, for example, the occurrence of an arc. Therefore, there is a possibility that the first power consumer facility 3A (power receiving facility 32A) and the second power consumer facility 3B (power receiving facility 32B) are electrically connected. At this time, the power receiving facility 32A and the power receiving facility 32B are in a loop connection state via the power system, causing a short circuit accident. However, since the power system S1 is in the non-connection state when switching between the first connection state and the second connection state, there is a possibility that the contact c1 and the contact c2 as described above are electrically connected. It is possible to suppress the occurrence of system faults.

  In the first embodiment, in the first switching instruction signal generation process, it is determined whether or not the first predicted demand (second predicted demand) exceeds the first contract demand (second contract demand). Instead of the first contract demand (second contract demand), it may be determined whether or not a predetermined demand value specified by the user is exceeded. By comprising in this way, the 1st electric power consumer and the 2nd electric power demand so that the electric power demand in each of the 1st electric power consumer and the 2nd electric power consumer may become below the above-mentioned predetermined demand value. The power from the distributed power source 1 can be interchanged with the house.

  In the first embodiment, in the second switching instruction signal generation process, depending on whether or not the received power value P3a ′ (P3′b) is equal to or less than the first threshold (second threshold), the first power consumer Although the case where it was determined whether or not there is a possibility that a reverse power flow occurs in the facility 3A (second power consumer facility 3B), the determination method of whether or not a reverse power flow occurs is not limited to this.

In the first embodiment, the integrated management device 4 generates a switching instruction signal by the above-described two switching instruction signal generation processing, and the switching device 2 switches the connection state of the switch 21 based on the switching instruction signal. Although the case has been shown, it may be configured as follows. For example, the connection state of the switch 21 may be switched every predetermined time period (separation such as morning, day and night or separation at a predetermined time such as 2 hours 3 hours). In this case, the connection state for the predetermined time zone is set in advance for the switching device 2 or the integrated management device 4. Moreover, the display of the output power (output power value P _PV ) from the distributed power source 1 and the power usage status (power consumption values P1a, P1b, supply power by the EMS (EMS33A, 33B) of each power consumer facility 3 The display of the values P2a, P2b and the received power values P3a, P3b) may be confirmed, and the first power consumer or the second power consumer may manually switch the connection state of the switch 21.

  In the first embodiment, the integrated management device 4 transmits a switching instruction signal to the switching device 2 when instructing switching of the switch 21, but further outputs an output stop signal to the distributed power source 1. And an output start signal may be transmitted. Specifically, the processing is as follows.

That is, when the integrated management device 4 determines that switching of the switch 21 is necessary, the integrated management device 4 transmits an output stop signal for stopping the output of power to the distributed power source 1. The distributed power source 1 stops the output of power from the distributed power source 1 based on the output stop signal. Note that power generation by the power generation device 11 may be stopped. Next, after confirming that the power output from the distributed power source 1 has stopped, the integrated management device 4 transmits a switching instruction signal to the switching device 2 to instruct switching of the switch 21. When the output power value P _PV received from the distributed power source 1 becomes 0 or when the signal indicating that the output is stopped is received from the distributed power source 1, the integrated management device 4 It is determined that the power output from the power source 1 has stopped. And the switch 21 switches a 1st connection state and a 2nd connection state via a non-connection state based on the received switching instruction | indication signal. Next, after confirming that the switching device 21 has been switched, the integrated management device 4 transmits an output start signal for starting output of power to the distributed power source 1. The integrated management device 4 determines that the switching device 21 has been switched based on a connection state signal received from the switching device 2 or a signal indicating that switching of the switching device 21 from the switching device 2 has been completed. To do. The distributed power source 1 starts output of power from the distributed power source 1 based on the received output start signal. Note that power generation by the power generation device 11 may be started.

  As described above, when switching between the first connection state and the second connection state, by stopping the distributed power source 1, the possibility that the contact c1 and the contact c2 are electrically connected is further suppressed, The occurrence of the short circuit accident can be further suppressed.

  In the first embodiment, the integrated management device 4 communicates with the distributed power source 1, the switching device 2, the first power consumer facility 3 </ b> A, and the second power consumer facility 3 </ b> B through the first power consumer ( Although the case where the switching of the switching device 2 is controlled according to the power usage state by the power load 31A) and the second power consumer (power load 31B) is shown, the present invention is not limited to this. For example, the switch 21 may be switched by communication between the first power consumer facility 3A and the second power consumer facility 3B. FIG. 5 shows a power system according to such a modification. The power system S1 'according to the present modification is different from the power system S1 in that the integrated management device 4 is not provided.

  In the power system S <b> 1 ′, the distributed power source 1, the switching device 2, the first power consumer facility 3 </ b> A, and the second power consumer facility 3 </ b> B are configured to be able to communicate with each other via the communication network 91. In the power system S1 'configured as described above, for example, the first power consumer equipment 3A requests the second power consumer equipment 3B to switch the connection state of the switch 21. And the 2nd electric power consumer equipment 3B which received this request judges whether switching of switch 21 is possible. When the second power consumer facility 3B determines that switching is possible, the second power consumer facility 3B instructs the switching device 2 to switch the switch 21 and when it is determined that switching is not possible, the first power consumer facility 3B Tell facility 3A to that effect. The same applies from the second power consumer facility 3B to the first power consumer facility 3A. It is determined whether or not the switching of the connection state is desired and whether or not the switching device 21 can be switched based on whether or not the predicted demand exceeds the contract demand or whether or not a reverse power flow is likely to occur. Judgment may be made based on the above.

  For example, the EMS 33B calculates the second predicted demand in the second power consumer facility 3B, and when the calculated second predicted demand is likely to exceed the second contract demand, the first power consumer facility 3A ( The EMS 33A) is requested to supply power from the distributed power source 1. The EMS 33A receives a request for power supply from the distributed power source 1 from the second power consumer facility 3B, calculates the first predicted demand in the first power consumer facility 3A, and calculates the calculated first predicted demand. If the first contract demand is not exceeded, a switching instruction signal is transmitted to the switching device 2 so as to switch the switch 21 from the first connection state to the second connection state. Then, the switching device 2 switches the switch 21 from the first connection state to the second connection state based on the received switching instruction signal. On the other hand, when the calculated first predicted demand exceeds the first contract demand, the EMS 33A does not generate a switching instruction signal (does not switch the switch 21) and cannot switch to the second connection state. Is transmitted to EMS33B. In the present modification, the EMS 33A corresponds to a “switching instruction unit” recited in the claims.

  Further, the power system S1 'can be configured as follows. The first power consumer equipment 3A uses the power in the first power consumer equipment 3A based on the power consumption value P1a, supply power value P2a, and received power value P3a input from the power detection unit 321A. Check the situation. Further, the first power consumer facility 3A acquires the power consumption value P1b, the supplied power value P2b, and the received power value P3b from the second power consumer facility 3B by communication via the communication unit 331A, and based on these. Then, the power usage status in the second power customer facility 3B is confirmed. Subsequently, the EMS 33A of the first power customer facility 3A determines whether or not switching between the first connection state and the second connection state is necessary based on these power usage states. Then, when the EMS 33A determines that the switching device 21 needs to be switched, the switching instruction signal is transmitted to the switching device 2, and the switching device 2 connects the switching device 21 based on the received switching instruction signal. Switch state. Note that whether or not the switching device 21 needs to be switched is determined based on whether or not the predicted demand described above exceeds the contract demand (see FIG. 3), or whether or not a reverse power flow is likely to occur (FIG. 4). Reference). In this case, the EMS 33A corresponds to a “switching instruction unit” described in the claims. Moreover, although the case where 3 A of 1st electric power consumer equipments judged whether switching of the switch 21 was required was shown above, on the contrary, the 2nd electric power consumer equipment 3B judges. May be. In this case, the EMS 33B corresponds to a “switching instruction unit” described in the claims.

  As described above, even when communication is performed between the first power consumer facility 3A and the second power consumer facility 3B, the distributed power is distributed between the first power consumer and the second power consumer. The power supplied from the power source 1 can be interchanged.

  In the first embodiment, the case where each of the power consumer facilities 3A and 3B includes the power receiving facilities 32A and 32B that can receive power from the power system K has been described, but the present invention is not limited thereto. For example, as illustrated in FIG. 6, the switching device 2 and the power receiving facilities 32 </ b> A and 32 </ b> B may be accommodated in one housing and handled as one power receiving facility G. Therefore, the power receiving facility G has two power receiving facilities 32 </ b> A and 32 </ b> B each connected to the power system K, and these are connected via the switching device 2 with the power line. The power load 31A in the first power consumer facility 3A is connected to the power receiving facility 32A, and the power load 31B in the second power consumer facility 3B is connected to the power receiving facility 32B. In addition, the distributed power source 1 is connected to the switching device 2 inside the power receiving facility G. Thus, even if the distributed power source 1 and the power receiving equipment G are not installed in any of the buildings A and B, but are arranged independently, the power load 31A in the first power consumer And the electric power supply from the distributed power supply 1 can be accommodated in the electric power load 31B in the second electric power consumer.

  FIG. 7 shows a power system according to the second embodiment of the present disclosure. The power system S2 of the present embodiment is different from the power system S1 in that the distributed power source 1 further includes a charge / discharge device 13.

  The charging / discharging device 13 accumulates and discharges electric power. Charging / discharging device 13 is a secondary battery such as a lead storage battery, a nickel metal hydride battery, or a lithium ion battery. A lithium ion capacitor or an electric double layer capacitor may be used. The charging / discharging device 13 is controlled by the power conditioner 12. The power conditioner 12 charges the charging / discharging device 13 using the power generated by the power generation device 11 or the power supplied from the power system K. Further, the power conditioner 12 discharges the electric power stored in the charging / discharging device 13 and uses it as the power supplied from the distributed power source 1.

  Also in the power system S2 configured as described above, a distributed power source is used according to the power usage statuses of the power load 31A of the first power consumer and the power load 31B of the second power consumer. One power supply destination is switched between the power receiving facility 32A and the power receiving facility 32B. Therefore, the electric power supplied from the distributed power source 1 can be interchanged between the first electric power consumer and the second electric power consumer.

  In the power system S2, the following may be performed in the second switching signal generation process (see FIG. 4). When the second switching signal generation process is performed, the integrated management device 4 (management control unit 41) determines that the received power value P3a ′ is equal to or less than the first threshold in step S21 (S21: YES). ) The charge rate of the charge / discharge device 13 is confirmed before performing the process of step S23. If the charging / discharging device 13 can be charged, the distributed power source 1 is charged with the charging / discharging device 13 using the power generated by the power generation device 11, and the output power from the distributed power source 1 is suppressed. Let As a result, when the received power value P3a 'becomes equal to or greater than the first threshold value, a switching instruction signal for setting the switch 21 to the first connection state is generated. On the other hand, even if the charging / discharging device 13 is charged, if the received power value P3a 'remains below the first threshold value, the process of step S23 is performed. If the charging rate of the charging / discharging device 13 is confirmed and it is determined that the charging / discharging device 13 cannot be charged due to full charging or the like, the process of step S23 is performed.

  FIG. 8 shows a power system according to the third embodiment of the present disclosure. The power system S3 of the present embodiment is different from the power system S1 in that it includes three or more power customer facilities 3. In FIG. 8, illustration of the power system K, the integrated management device 4, the communication network 91, and the like is omitted.

  In the present embodiment, the switch 21 is configured by combining a plurality of switches. For example, as shown in FIG. 8, the switcher 21 includes a plurality of SPST (Single Pole, Single Throw) type switches 211. In addition, the structure of the switch 21 shown in FIG. 8 is an example, Comprising: It is not limited to this. In the switching device 21 configured as described above, the switch 211 connected to the power consumer facility 3 to which power is to be supplied from the distributed power source 1 is turned on, so that the distributed power source is connected to the power consumer facility 3. Power from 1 can be supplied. In the case of the switching device 21 shown in FIG. 8, an interlock function is provided to restrict the plurality of switches 211 from being in a conductive state at the same time. Therefore, when the connection state is switched so that only one switch 211 is in a conductive state and only the other switch 211 is in a conductive state, a connection state in which all the switches 211 are once cut off is connected. After that, only the other one switch 211 is turned on.

  In addition, when a plurality of power consumer facilities 3 are provided, the power supply from the distributed power source 1 may be required simultaneously in the plurality of power consumer facilities 3. In preparation for such a case, a priority order is set in advance for each power consumer facility 3, and in a plurality of power consumer facilities 3, it is necessary to simultaneously supply power from the distributed power source 1. What is necessary is just to supply the electric power from the distributed power supply 1 to the electric power consumer equipment 3 with the higher priority set.

  Also in the power system S3 configured as described above, the power supply destination of the distributed power source 1 is set to a plurality of powers according to the power usage state in the power consumer equipment 3 (power load) that each of the plurality of power consumers has. It can be switched to any of the customer facilities 3. Therefore, the electric power supplied from the distributed power source 1 can be interchanged among a plurality of electric power consumers.

  FIG. 9 illustrates a power system according to the fourth embodiment of the present disclosure. In the said 1st Embodiment and the said 2nd Embodiment, although the case where electric power interchange was performed between 3A of 1st electric power consumer equipment and the 2nd electric power consumer equipment 3B was shown, the electric power system of this embodiment In S <b> 4, power interchange is performed between a plurality of regions C each including one or more power customer facilities 3. FIG. 9 shows the overall configuration of the power system S4. In addition, in electric power system S4, the number of the electric power consumer facilities 3 is not limited to what is shown in FIG.

  In the power system S4, one or more power customer facilities 3 are connected to each of the plurality of areas C by a power network 92 as shown in FIG. In the present embodiment, the distributed power source 1 and the switching device 2 are installed in the region C1. The distributed power source 1 in the present embodiment is a distributed power source having a relatively high power supply capability, such as a mega solar. On the other hand, no distributed power source is installed in region C2 due to, for example, a restriction that a distributed power source cannot be installed (for example, there is no installation space). In the present embodiment, it is assumed that the power network 92 in the region C1 and the power network 92 in the region C2 are connected to different power systems K1 and K2, respectively. These power networks 92 may be connected to the same power system K.

  As shown in FIG. 9, each of the plurality of areas C includes a CEMS (Community Energy Management System) 6 that can communicate with a plurality of electric power customer facilities 3 and the like in each area C. Each CEMS 6 is a system that integrally manages power supply / demand in each region C. Each CEMS 6 can communicate with the integrated management apparatus 4 via the communication network 91, and transmits information related to power supply / demand in each region C to the integrated management apparatus 4.

  The power system S4 switches the connection state of the switching device 2 so that the power supply destination of the distributed power source 1 installed in the region C1 is the power network 92 of the region C1, and the power network 92 of the region C2. It is comprised so that it may switch with the 2nd connection state which is. And electric power system S4 is comprised so that the integrated management apparatus 4 may switch the connection state of the switching apparatus 2 based on the information regarding the said demand / supply of the electric power received from each CEMS6.

  The power system S4 configured as described above switches the connection state of the switching device 2 based on the information on the power supply / demand in each region C, that is, the power usage state in each region C, thereby enabling the region C1. The power supply destination of the distributed power source 1 installed in can switch between the first connection state that is the power network 92 of the region C1 and the second connection state that is the power network 92 of the region C2. Thereby, for example, when the power consumption in the region C1 is low and the power consumption in the region C2 is large, the output power of the distributed power source 1 installed in the region C1 is changed by switching the connection state of the switching device 2. The power can be supplied to the power network 92 in the region C2. Further, for example, even if a power failure or the like occurs in the region C2 and power cannot be received from the power system K2, the output power of the distributed power source 1 installed in the region C1 is changed to the region by switching the connection state of the switching device 2. It can be supplied to the C2 power network 92. Therefore, in the power system S4, power can be interchanged among the plurality of regions C.

  In the fourth embodiment, at least one or more of the plurality of power consumer facilities 3 may individually include a distributed power source (individual distributed power source) different from the distributed power source 1. However, the power supply destination of this individual distributed power source is not changed by switching by the switching device 2. For example, the individual distributed power source of the power consumer equipment 3 connected to the power network 92 in the region C1 is consumed by the power consumer equipment 3 or supplied to the power network 92 in the region C1. However, it is not supplied to the power network 92 in the region C2 by switching by the switching device 2.

  In the fourth embodiment, power interchange between a plurality of regions C has been described. However, the present invention is not limited to this, and power interchange can be similarly performed between a plurality of smart grids and a plurality of micro grids. it can.

  The power system and the switching device according to the present disclosure are not limited to the above-described embodiments. The specific configuration of each part of the power system and the switching device according to the present disclosure can be varied in design in various ways.

S1-S4, S1 ': Power system A, B: Building G: Power receiving equipment C, C1, C2: Region K, K1, K2: Power system 1: Distributed power source 11: Power generator 12: Power conditioner 121: Communication Unit 122: Power detection unit 13: Charging / discharging device 2: Switching device 21: Switch 211: Switch 22: Switching control unit 221: Communication unit 3: Power customer facility 3A: First power customer facility 3B: Second Power customer equipment 31A, 31B: power load 32A, 32B: power receiving equipment 33A, 33B: energy management system (EMS)
321A, 321B: Power detection units 331A, 331B: Communication unit 4: Integrated management device 41: Management control unit 411: Communication unit 5: Power line 6 between power consumers: CEMS
91: Communication network 92: Power network

Claims (10)

A distributed power source capable of supplying power;
A first power receiving facility that receives power from the power system and supplies power to a first power load of a first power consumer;
A second power receiving facility that receives power from the power grid and supplies power to a second power load of a second power consumer;
A switching device that switches between a first connection state in which power is supplied from the distributed power source to the first power receiving facility and a second connection state in which power is supplied from the distributed power source to the second power receiving facility;
With
The switching device switches between the first connection state and the second connection state in accordance with a first power usage state by the first power load and a second power usage state by the second power load. ,
A power system characterized by that. A first monitoring device for acquiring the first power usage status;
A second monitoring device for acquiring the second power usage status;
A switching instruction unit that is communicable with the switching device and that instructs the switching device to switch between the first connection state and the second connection state;
The switching instruction unit includes the first connection state and the second power according to the first power usage status acquired by the first monitoring device and the second power usage status acquired by the second monitoring device. A switching instruction signal for switching between connection states is transmitted to the switching device,
The switching device switches between the first connection state and the second connection state based on the switching instruction signal received from the switching instruction unit;
The power system according to claim 1. And further comprising an integrated management device having the switching instruction unit and capable of communicating with the first monitoring device and the second monitoring device,
The integrated management device receives the first power usage status from the first monitoring device, and receives the second power usage status from the second monitoring device;
The switching instruction unit generates the switching instruction signal based on the received first power usage situation and the second power usage situation.
The power system according to claim 2. When the switching device is in the first connection state, the predicted demand at the end of the demand time limit exceeds the contract demand based on the contract with the power provider in the second power consumer, and the first power consumer In the electric power consumer, when the predicted demand at the end of the demand time period when the second connection state is set does not exceed the contract demand based on the contract with the power provider, the second connection state is switched.
The power system according to any one of claims 1 to 3. In the first power consumer, the switching device receives power from the power grid that is equal to or lower than a first threshold value in the first power consumer, and in the second power consumer, the second power consumer When the power received from the power system in the connected state is larger than the second threshold, the second connected state is switched.
The power system according to any one of claims 1 to 3. When the switching device switches between the first connection state and the second connection state, the power supplied from the distributed power source is not supplied to either the first power receiving facility or the second power receiving facility. Through the connection status,
The power system according to any one of claims 1 to 5. A third power receiving facility that receives power from the power system and supplies power to a third power load of a third power consumer;
The switching device can be switched to a third connection state in which power is supplied from the distributed power source to the third power receiving facility.
The power system according to any one of claims 1 to 6. A distributed power source capable of supplying power;
A first power network to which one or more first power consumer equipment installed in a first demand area is connected;
A second power network to which one or more second power consumer facilities installed in a second demand area are connected;
A switching device that switches between a first connection state in which power is supplied from the distributed power source to the first power network and a second connection state in which power is supplied from the distributed power source to the second power network;
With
The switching device switches between the first connection state and the second connection state according to a first power usage situation in the first demand area and a second power usage situation in the second demand place. ,
A power system characterized by that. It is possible to switch between a first connection state in which power is supplied from a distributed power source capable of supplying power to the first power receiving facility and a second connection state in which power is supplied from the distributed power source to the second power receiving facility. A switch,
A switching control unit for controlling the switch and switching between the first connection state and the second connection state;
With
The first power receiving facility receives power from a power system and supplies power to a first power load of a first power consumer,
The second power receiving facility receives power from a power system and supplies power to a second power load of a second power consumer,
The switching control unit is configured to switch between the first connection state and the second connection state according to a first power usage state by the first power load and a second power usage state by the second power load. Switch,
A switching device characterized by that. A switcher capable of switching between a first connection state in which power is supplied from a distributed power source capable of supplying power to a first power network and a second connection state in which power is supplied from the distributed power source to a second power network. When,
A switching control unit for controlling the switch and switching between the first connection state and the second connection state;
With
The first power network is connected to one or more first power consumer facilities installed in a first demand area,
The second power network is connected to one or more second power customer facilities installed in a second demand area,
The switching control unit changes the first connection state and the second connection state according to a first power usage state in the first demand area and a second power usage state in the second demand place. Switch,
A switching device characterized by that.

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