JP6971196B2 - Power system and switching device - Google Patents

Description

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

Conventionally, a power consumer having a power load has installed a distributed power source such as a solar cell or a fuel cell, and a part of the power required by 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 photovoltaic power generation device. As a result, it is possible to suppress the electric power received from the electric power system and reduce the electric charge of the electric power consumer.

Japanese Unexamined Patent Publication No. 2015-133871

However, some power consumers may not be able to install distributed power sources. For example, if there is no installation space, or if the skeleton strength is insufficient even if there is installation space, distributed power sources cannot be installed. Such electric power consumers have no choice but to reduce power consumption by suppressing the operation of the power load or stopping the operation in order to suppress the electric power received from the electric power system. On the other hand, if reverse power flow is prohibited for electric power consumers who have installed distributed power sources, it is necessary to suppress power generation in order to suppress the occurrence of reverse power flow during the period when the power consumption due to the power load is low. rice field. Therefore, even if a distributed power source is installed, it may not be effectively utilized because its operating rate is lowered.

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

The power system provided by the first aspect of the present disclosure receives power from a decentralized power source capable of supplying power and a power system to power the first power load of the first power consumer. The first power receiving equipment to be supplied, the second power receiving equipment that receives power from the power system and supplies power to the second power load of the second power consumer, and the first from the distributed power source. It is provided with a switching device for switching between a first connection state in which power is supplied to the power receiving equipment 1 and a second connection state in which power is supplied from the distributed power source to the second power receiving equipment. Is characterized by switching between the first connection state and the second connection state according to the first power usage status due to the first power load and the second power usage status due to the second power load. And. According to this configuration, the power supply destination of the distributed power source is according to the power usage status 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 equipment and the second power receiving equipment. Therefore, the electric power supplied from the distributed power source can be exchanged between the first electric power consumer and the second electric power consumer. As a result, power consumers 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, and power consumers who have a distributed power source can be distributed. The occurrence of reverse power flow can be suppressed without lowering the operating rate of the type power supply.

In a preferred embodiment of the power system, between the first monitoring device for acquiring the first power usage status, the second monitoring device for acquiring the second power usage status, and the switching device. The switching device is capable of communication and further includes a switching instruction unit for instructing the switching between the first connection state and the second connection state, and the switching instruction unit is 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 status acquired by the user and the second power usage status 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 switches between the first connection state and the second connection state according to the instruction from the switching instruction unit. Therefore, it is possible to control the power interchange between the first power consumer and the second power consumer by a switching instruction unit separate from the switching device.

In a preferred embodiment of the power system, the integrated management device further comprises the switching instruction unit and is 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. 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 unit included in the integrated management device generates a switching instruction signal for switching between the first connection state and the second connection state. Therefore, the integrated management device 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. As a result, the switching device switches between the first connection state and the second connection state based on the received switching instruction signal. Therefore, the integrated management device can collectively control the power interchange between the first power consumer and the second power consumer.

In a preferred embodiment of the electric power system, the switching device is based on a contract with an electric power company for the predicted demand at the end of the demand time limit in the second electric power consumer in the first connection state. The above is the case where the contract demand is exceeded and the predicted demand at the end of the demand time limit when the second connection state is set does not exceed the contract demand based on the contract with the electric power company in the first electric power consumer. Switch to the second connection state. For example, in a second electric power consumer who does not have a distributed power source, since the electric power demand does not exceed the contract demand, it has conventionally 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 meets the contract demand even if there is no power supply from the distributed power source. If it does not exceed, the distributed power source can be switched to the state of supplying power to the second power receiving facility. Therefore, it is possible to prevent the power demand from exceeding the contract demand without stopping or suppressing the operation of the second power load.

In a preferred embodiment of the power system, in the switching device, the power received from the power system by the first power consumer is equal to or less than the first threshold value in the first connection state, and the power system is described. In the second power consumer, when the power received from the power system in the second connection state is larger than the second threshold value, the second connection state is switched to. For example, when the first power consumer having a distributed power source is a grid interconnection without reverse power flow, conventionally, the power supply from the distributed power source is suppressed so that reverse power flow does not occur. In addition, "grid interconnection" indicates the connection of power generation equipment to the power grid of an electric power company and its state, and "grid interconnection without reverse power flow" means distribution even if grid interconnection is performed. This is the case when 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 and the second threshold, and the power received from the power system in the first power consumer is equal to or less than the first threshold and is the first. In the second power consumer, if the power received from the power system is larger than the second threshold even if the power is supplied from the distributed power supply, the power is switched from the distributed power supply to the second power receiving facility. Can be done. Therefore, it is possible to suppress the occurrence of reverse power flow in the first electric power consumer without suppressing the power generation of 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 receiving facility. Through a non-connected state that is not supplied to any of the power receiving equipment of 2. When the first connection state and the second connection state are switched instantly, the first power receiving equipment and the second power receiving equipment may be electrically connected, and in this case, the loop connection via the power system may be used. , Causes a short circuit accident. However, according to this configuration, when switching between the first connected state and the second connected state, since the non-connected state is used, it is possible to prevent the first power receiving equipment and the second power receiving equipment from electrically conducting each other. can. Therefore, the occurrence of the short-circuit accident can be suppressed.

In a preferred embodiment of the power system, a third power receiving facility that receives power from the power system and supplies power to the third power load of the third power consumer is further provided. 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 network, a second power network to which one or more second power consumer facilities installed in the second demand area are connected, and a first power network to which power is supplied from the distributed power source to the first power network. A switching device for switching between a connection state and a second connection state in which power is supplied from the distributed power source to the second power network is provided, and the switching device is the first in the first demand area. It is characterized in that the first connection state and the second connection state are switched according to the power usage status of the above and the second power usage status in the second demand area. According to this configuration, the power supply destinations of the distributed power sources are the first power grid and the second power grid 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 exchanged 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 from a distributed power source capable of supplying power to a first power receiving equipment and a second power receiving equipment from the distributed power source. It is provided with a switch capable of switching between a second connection state in which electric power is supplied to the switch, 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 the power system and supplies power to the first power load of the first power consumer, and the second power receiving facility receives power from the power system. Is received to supply electric power to the second electric power load of the second electric power consumer, and the switching control unit is responsible for the first electric power usage status due to the first electric power load and the second electric power load. It is characterized in that the first connection state and the second connection state are switched according to the second power usage status due to the power load. According to this configuration, the power supply destination of the distributed power source is according to the power usage status 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 equipment and the second power receiving equipment. Therefore, the electric power supplied from the distributed power source can be interchanged between the first electric power consumer and the second electric power consumer.

The switching device provided by the fourth aspect of the present disclosure is a first connection state in which power is supplied from a distributed power source capable of supplying power to a first power grid and power from the distributed power source to a second power grid. It is provided with a switching device capable of switching between the second connection state to which power is supplied, and a switching control unit for controlling the switching device and switching between the first connection state and the second connection state. The first power grid is connected to one or more first power consumer facilities installed in the first demand area, and the second power network is connected to one or more first power network installed in the second demand area. The second power consumer equipment is connected, and the switching control unit is said to have the first power usage status in the first demand area and the second power usage status in the second demand area. It is characterized in that the first connection state and the second connection state are switched. According to this configuration, the power supply destinations of the distributed power sources are the first power grid and the second power grid according to the first power usage situation in the first demand area and the second power usage situation in the second demand area. It can be switched 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 electric power system and the switching device of the present disclosure, it is possible to suppress the power reception from the electric power system of each electric power consumer by accommodating the electric power supplied from the distributed power source among a plurality of electric power consumers. 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 systems and switching devices of the present disclosure will be more apparent by the detailed description given below with reference to the accompanying drawings.

It is a figure which shows the whole structure of the electric power system which concerns on 1st Embodiment. It is a figure which shows the detailed structure of the electric power system which concerns on 1st Embodiment. It is a flowchart which shows the 1st switching instruction signal generation processing performed by a general management apparatus. It is a flowchart which shows the 2nd switching instruction signal generation processing performed by the integrated management apparatus. It is a figure which shows the whole structure of the electric power system which concerns on the modification of 1st Embodiment. It is a figure which shows the whole structure of the electric power system which concerns on the modification of 1st Embodiment. It is a figure which shows the detailed structure of the electric power system which concerns on 2nd Embodiment. It is a figure which shows the whole structure of the electric power system which concerns on 3rd Embodiment. It is a figure which shows the whole structure of the electric power system which concerns on 4th Embodiment.

Preferred embodiments of the power system and switching device of the present disclosure will be described below with reference to the drawings.

1 and 2 show the power system according to the first embodiment of the present disclosure. The electric power system S1 of the first embodiment includes a distributed power source 1, a switching device 2, a plurality of electric power consumer equipment 3, and an integrated management device 4. In the present embodiment, a case where the first electric power consumer equipment 3A and the second electric power consumer equipment 3B are provided as the plurality of electric power consumer equipment 3 will be described.

FIG. 1 shows the overall configuration of the power system S1. FIG. 2 shows a detailed configuration of the power system S1. In these figures, the one shown by the thick solid line shows the power path, and the one shown by the solid line with an arrow shows the communication path.

As shown in FIGS. 1 and 2, in the electric power system S1, the distributed power source 1, the switching device 2 and the first electric power consumer equipment 3A are installed in the building A owned by the first electric power consumer. There is. Further, the second electric power consumer equipment 3B is installed in the building B owned by the second electric power consumer. Further, the first electric power consumer equipment 3A and the second electric power consumer equipment 3B are connected by a power line 5 between electric 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 equipment 3A, the second power consumer equipment 3B, and the integrated management device 4 are communication networks, respectively. It is connected to 91.

The distributed power source 1 generates electric power and supplies the generated electric power to either the first electric power consumer equipment 3A or the second electric power consumer equipment 3B. In the present embodiment, a photovoltaic power generation device will be described as an example of the distributed power source 1. The distributed power source 1 has a power generation device 11 and a power conditioner 12.

The power generation device 11 includes a solar cell, and generates DC 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 controls various types of the distributed power source 1. The power conditioner 12 converts, for example, the electric power generated by the power generation device 11 into electric power having characteristics suitable for the first electric power consumer equipment 3A and the second electric power consumer equipment 3B. In this embodiment, the power conditioner 12 includes an inverter circuit. The inverter circuit converts the DC power input from the power generation device 11 into AC power. The power conditioner 12 also 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 has a communication unit 121 and a power detection unit 122. The communication unit 121 communicates with the integrated management device 4. The communication between the communication unit 121 and the integrated management device 4 may be wireless communication or wired communication. The power detection unit 122 detects the power output from the distributed power source 1. Power detector 122, the output power value P _PV from the detected dispersed power source 1, transmits to the integrated management apparatus 4 via the communication unit 121.

Note that in a distributed power source 1, the display unit power detecting unit 122 is not shown the output power value P _PV detected (e.g. monitor) may be displayed on.

In the present embodiment, the photovoltaic power generation device has been described as an example as the distributed power source 1, but the present invention is not limited to this, and is not limited to this, such as a wind power generation device, a fuel cell power generation device, cogeneration, an internal combustion power generation device, or a small hydroelectric power generation device. It may be configured to include a plurality of these items. Further, when the distributed power source 1 is these, the power generation device 11 may not generate DC power but may generate AC power. Depending on the power generation device 11, a control unit having a communication unit 121 and a power detection unit 122 may be used instead of the power conditioner 12.

The switching device 2 selectively switches whether the electric power generated by the distributed power source 1 is supplied to the first electric power consumer equipment 3A or the second electric power consumer equipment 3B. The switching device 2 is arranged on the power line 5 between power consumers connecting the first power consumer equipment 3A and the second power consumer equipment 3B. The switching device 2 has 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 connected states, a first connected state, a second connected state, and a non-connected state.

The first connection state is a state in which the distributed power source 1 and the first power consumer equipment 3A are electrically connected, and the distributed power source 1 and the second power consumer equipment 3B are cut off. Therefore, in the first connection state, the first power consumer equipment 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. It is supplied to equipment 3A.

The second connection state is a state in which the distributed power source 1 and the first power consumer equipment 3A are cut off, and the distributed power source 1 and the second power consumer equipment 3B are connected to each other. Therefore, in the second connection state, the second power consumer equipment 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 equipment. It is supplied to 3B.

The non-connected state is a state in which the distributed power source 1 is cut off from both the first power consumer equipment 3A and the second power consumer equipment 3B. Therefore, in the non-connected state, neither the first power consumer equipment 3A nor the second power consumer equipment 3B is selected as the supply destination of the output power from the distributed power supply 1, and the output from the distributed power supply 1 is not selected. The electric power is not supplied to the first electric power consumer equipment 3A or the second electric power consumer equipment 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 electric power consumer equipment 3A is connected to the contact c1. The second electric power consumer equipment 3B is connected to the contact c2. And nothing is connected to the contact c3. In such a switch 21, when the contact c0 and the contact c1 are in the conductive state, the first connection state is set, and when the contact c0 and the contact c2 are in the conductive state, the second connection state is set, and the contact c0 and the contact c3 are in the conductive state. When it is in a conductive state, it is in a non-connected state. FIG. 2 shows a case where the contact c0 and the contact c1 are in a conductive state in a first connected state. The configuration of the switch 21 is not limited to the above as long as it can switch between the first connected state, the second connected state, and the non-connected state.

The switching control unit 22 switches the switching device 21. As shown in FIG. 2, the switching control unit 22 has a communication unit 221. The communication unit 221 communicates with the integrated management device 4. 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 switching device 21 based on the received switching instruction signal. The switching instruction signal is a signal for instructing the switching of the switching device 21. When the switching instruction signal received indicates 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, and then switches the switch 21 to the non-connection state. Switch from the non-connected state to the second connected state. Further, when the received switching instruction signal indicates switching from the second connection state to the first connection state, the switching control unit 22 switches the switch 21 from the second connection state to the non-connection state. Later, the non-connected state is switched to the first connected state. That is, the switching control unit 22 goes through the non-connected state when switching between the first connected state and the second connected state. The switching control unit 22 is second when the switching device 21 receives a switching instruction signal instructing switching to the first connection state in the first connection state and when the switching device 21 is in the second connection state. When the switching instruction signal for instructing the switching to the connected state is received, the switching device 21 is not particularly switched.

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

Both the first electric power consumer equipment 3A and the second electric power consumer equipment 3B are connected to the electric power system K and can receive electric power from the electric power system K. The first electric power consumer equipment 3A and the second electric power consumer equipment 3B are connected to the electric power system K at different positions. The first electric power consumer facility 3A is a facility owned by the first electric power consumer. The second electric power consumer facility 3B is a facility owned by the second electric power consumer. The first power consumer equipment 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 equipment 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 consumer equipment 3A includes a power load 31A, a power receiving equipment 32A, and an energy management system 33A. The second power consumer equipment 3B includes a power load 31B, a power receiving equipment 32B, and an energy management system 33B. In the following description, the energy management system is referred to as "EMS".

Both the power loads 31A and 31B consume power. The electric power loads 31A and 31B are, for example, various electric devices installed in general households, factories, commercial facilities, and the like, respectively. The electric power load 31A is supplied with electric power from the power receiving equipment 32A. The electric power load 31B is supplied with electric power from the power receiving equipment 32B.

Both the power receiving equipment 32A and 32B are configured to include a distribution board and a distribution board. The power receiving equipment 32A and 32B receive power supplied from the power system K and the distributed power source 1, respectively. The power receiving facility 32A supplies the received power to the power load 31A. When the power receiving facility 32A receives power from the distributed power source 1, the power receiving equipment 32A supplies the power from the distributed power source 1 to the power load 31A in preference to the power from the power system K. As shown in FIG. 2, the power receiving equipment 32A has a power detecting unit 321A. Further, the power receiving facility 32B supplies the received power to the power load 31B. When the power receiving facility 32B receives power from the distributed power source 1, the power receiving equipment 32B supplies the power from the distributed power source 1 to the power load 31B in preference to the power from the power system K. As shown in FIG. 2, the power receiving equipment 32B has a power detecting unit 321B.

The electric power detection unit 321A detects various electric powers in the first electric power consumer equipment 3A. In the present embodiment, the power detection unit 321A is used from the power consumed by the power load 31A (power consumption), the power supplied from the distributed power supply 1 via the switching device 2 (power supply), and the power system K. Detects the power to be received (power received). The power detection unit 321A detects power consumption by, for example, detecting the power supplied from the power receiving equipment 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 EMS33A. The electric power detection unit 321B detects various electric powers in the second electric power consumer equipment 3B. The power detection unit 321B is configured in the same manner as 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 EMS33B.

The EMS33A manages the demand and supply of various electric powers in the first electric power consumer equipment 3A. The EMS33B manages the demand and supply of various electric powers in the second electric power consumer equipment 3B. The EMS 33A and 33B are, for example, a system called HEMS (Home Energy Management System) if the buildings A and B are ordinary households, and are called BEMS (Building Energy Management System) if the buildings A and B are buildings. It is a system, and if the buildings A and B are factories, it is a system called FEMS (Factory Energy Management System).

The EMS33A inputs the power consumption value P1a, the supply power value P2a, and the received power value P3a from the power detection unit 321A. The EMS33A displays the input power consumption value P1a, the supplied power value P2a, and the 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 communicates with the integrated management device 4. The communication between the communication unit 331A and the integrated management device 4 may be wireless communication or wired communication. In the present embodiment, the EMS 33A transmits the power consumption value P1a, the supply power value P2a, and the received power value P3a to the integrated management device 4 via the communication unit 331A. EMS33A corresponds to the "first monitoring device" described in the claims.

EMS33B is configured in the same manner as EMS33A. As shown in FIG. 2, the EMS 33B has a communication unit 331B. The communication unit 331B is configured in the same manner as the communication unit 331A. The EMS 33B inputs the power consumption value P1b, the supply 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. EMS33B corresponds to the "second monitoring device" described in the claims.

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

The management control unit 41 controls various types of the integrated management device 4. As shown in FIG. 2, the management control unit 41 has a communication unit 411. The communication unit 411 communicates with the distributed power source 1, the switching device 2, the first power consumer equipment 3A (EMS33A), and the second power consumer equipment 3B (EMS33B). The communication between the communication unit 411 and 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 equipment 3A (EMS33A), and the second power consumer equipment 3B (EMS33B) via the communication unit 411, respectively. Sends and receives various signals.

Management control unit 41 via the communication unit 411 receives the output power value P _PV from the distributed power supply 1. 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 the power consumption value P1b, the supply power value P2b and the received power value from the EMS 33B. Receive P3b. 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. As a result, the switching device 2 switches the connection state of the switching device 21 based on the received switching instruction signal. In the present embodiment, the management control unit 41 corresponds to the "switching instruction unit" described in the claims.

3 and 4 are flowcharts showing a switching instruction signal generation process performed by the management control unit 41. FIG. 3 shows a switching instruction signal generation process (first switching instruction signal) in the case of switching the switching device 2 so that the power demand does not exceed the contract demand in the first power consumer and the second power consumer. Generation processing) is shown. 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 grid-connected without reverse power flow. The switching instruction signal generation process (second switching instruction signal generation process) in the case of switching the switching device 2 is shown so that the above is not generated. The "grid interconnection" indicates that a power generation facility (distributed power source 1) is connected to the power grid K and its state, and the "grid interconnection without reverse power flow" is a grid interconnection. However, it means that power is not sent to the distribution line. On the other hand, "grid interconnection with reverse power flow" refers to the case where electric power is sent to the 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 shown. May be. Further, when both of these switching instruction signal generation processes are performed, these switching instruction signal generation processes may be repeated in parallel or alternately 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. It 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 assumed to be the average demand power per demand time period, but may be the cumulative demand power per demand time period.

The current demand is the current value of the power demand in the current demand time limit. The management control unit 41 receives the current demand for the first power consumer equipment 3A based on the power consumption value P1a, the supply power value P2a, and the received power value P3a received from the first power consumer equipment 3A (EMS33A). 1st 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 values P3a received up to the present time in the current demand time limit. The first current demand calculation method is not limited to this. For example, the received power value P3a can be estimated from the value obtained by subtracting the supplied power value P2a from the power consumption value P1a. Similarly, the management control unit 41 also receives the second power consumer equipment 3B (EMS33B) based on the power consumption value P1b, the supply power value P2b, and the received power value P3b. The current demand for 3B (second current demand) is calculated.

The predicted demand is a predicted value of the power demand at the end of the current demand time limit. A well-known method may be used 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) is calculated. In the present embodiment, the management control unit 41 has no power supply from the distributed power source 1 to the first power consumer equipment 3A during the period from the current time of the current demand time to the end of the current demand time. As a result, the first predicted demand is calculated. That is, in the period, the first predicted demand is calculated assuming that it is in the second connected 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 Calculate the demand (second predicted demand). In the present embodiment, the management control unit 41 has no power supply from the distributed power source 1 to the second power consumer equipment 3B during the period from the current time of the current demand time to the end of the current demand time. As a result, the second predicted demand is calculated. That is, in the period, the second predicted demand is calculated assuming that it is in the first connection state.

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

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 or not the power supply from the distributed power source 1 is necessary in the second power consumer equipment 3B.

When it is determined in step S11 that the power does not exceed (S11: NO), that is, when it is determined that the power supply from the distributed power source 1 is not necessary in the second power consumer equipment 3B, the switch 21 is the first. A switching instruction signal is generated so that the connection state is established (S12). On the other hand, when it is determined in step S11 that the power is exceeded (S11: YES), that is, when it is determined that the second power consumer equipment 3B needs to be supplied with power from the distributed power source 1, the management control unit 41 Subsequently determines whether or not the first predicted demand exceeds the first contract demand (S13). That is, it is determined whether or not the power supply from the distributed power source 1 is necessary in the first power consumer equipment 3A.

When it is determined in step S13 that the power is exceeded (S13: YES), that is, when it is determined that the power supply from the distributed power source 1 is necessary in the first power consumer equipment 3A, the switch 21 is the first. A switching instruction signal is generated so that the connection state is established (S12). When the management control unit 41 determines in step S13 that the power exceeds the limit, the management control unit 41 generates a switching instruction signal for setting the switch 21 to the first connection state, and if necessary, to the second power consumer equipment 3B. You may also instruct as follows. It is an instruction to notify the notification means (not shown) provided in the second power consumer equipment 3B to reduce the power consumption of the power load 31B, or an instruction to stop a part of the power load 31B. On the other hand, when it is determined in step S13 that the power does not exceed (S13: NO), that is, when it is determined that the power supply from the distributed power source 1 is not necessary in the first power consumer equipment 3A, the switch 21 is used. 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) is shown, but each EMS 33A and 33B calculates each power demand and transmits this to the management control unit 41. You may try to do it.

Next, the second switching instruction signal generation process shown in FIG. 4 will be described. This second switching instruction signal generation process is performed when both the first power consumer equipment 3A and the second power consumer equipment 3B are grid-connected without reverse power flow as described above. The management control unit 41 uses the following received power values P3a'and P3b' to perform the second switching instruction signal generation processing. 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 It 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. Further, the received power value P3b'is also calculated in the same manner. 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 It 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 equipment 3A is equal to or less than the first threshold value (S21). Thereby, it is determined whether or not there is a possibility that reverse power flow may occur in the first electric power consumer equipment 3A. As the first threshold value, for example, a value of 0 or more is set. When the first threshold value is close to 0, it is less likely that reverse power flow may occur in the first power consumer equipment 3A in step S21, while the larger the first threshold value, the step. In S21, there is a high possibility that it is determined that reverse power flow may occur in the first electric power consumer equipment 3A. The first threshold is appropriately set by the first electric power consumer.

When it is determined in step S21 that the received power value P3a'is larger than the first threshold value (not equal to or less than the first threshold value) (S21: NO), that is, there is a possibility that reverse power flow will occur in the first power consumer equipment 3A. If it is determined that there is no such, 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 reverse power flow may occur in the first power consumer equipment 3A. If so, the management control unit 41 subsequently determines whether or not the received power value P3b'in the second power consumer equipment 3B is equal to or less than the second threshold value (S23). Thereby, it is determined whether or not there is a possibility that reverse power flow may occur in the second power consumer equipment 3B when the power is supplied from the distributed power source 1 to the second power consumer equipment 3B. .. As the second threshold value, for example, a value of 0 or more is set. When the second threshold value is close to 0, it is less likely that reverse power flow may occur in the second power consumer equipment 3B in step S23, while the larger the second threshold value, the step. In S23, there is a high possibility that it is determined that reverse power flow may occur in the second electric power consumer equipment 3B. The second threshold is appropriately set by the second electric power consumer. The first threshold value and the second threshold value may be the same or different. Further, the first threshold and the second threshold are the degree of suppression of the occurrence of reverse power flow in the first electric power consumer equipment 3A and the second electric power consumer equipment 3B, and the first electric power consumer equipment 3A. It may be appropriately set in consideration of the frequency of switching to the second electric power consumer equipment 3B.

When it is determined in step S23 that the received power value P3b'is greater than the second threshold value (not equal to or less than the second threshold value) (S23: NO), that is, there is a possibility that reverse power flow will occur in the second power consumer equipment 3B. If it is determined that there is no such, the management control unit 41 generates a switching instruction signal so that the switch 21 is in the second connection state (S24). On the other hand, when it is determined in step S23 that the received power value P3b'is equal to or less than the second threshold value (S23: YES), that is, it is determined that reverse power flow may occur in the second power consumer equipment 3B. If so, 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. Instruct 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 is set according to the power usage status of the power load 31A of the first power consumer and the power load 31B of the second power consumer. It switches between the power receiving equipment 32A and the power receiving equipment 32B. Therefore, the electric power supplied from the distributed power source 1 can be exchanged between the first electric power consumer and the second electric power consumer. For example, since a distributed power source cannot be individually installed in the building B, the second power consumer facility 3B in the building B has not been able to suppress the power received from the power system K by the distributed power source in the past. However, according to the electric power system S1, the electric power can be supplied from the distributed power source 1 installed in the building A from the building A to the building B, so that the second electric power consumer equipment 3B in the building B can supply the electric power. However, if necessary, the power received from the power system K by the distributed power source can be suppressed. In addition, if there is a risk of reverse power flow occurring in the first power consumer equipment 3A in the building A and power supply from the distributed power source 1 is unnecessary, the power generation of the distributed power source 1 must be suppressed in the past. Did not get. However, according to the power system S1, it is not necessary to suppress the power generation of the distributed power source 1, so that 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 equipment 3A, and based on these, the first power demand. Check the power usage status in the house equipment 3A. Further, the power consumption value P1b, the supplied power value P2b, and the received power value P3b are acquired from the second power consumer equipment 3B, and based on these, the power usage status in the second power consumer equipment 3B is confirmed. Then, the integrated management device 4 controls the switching of the switching device 2 according to the power usage status. Therefore, the integrated management device 4 can control the 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 and the distributed power source is used by the second power consumer who does not have the distributed power source. In the first electric power consumer having 1, if the first predicted demand does not exceed the first contract demand, the switch 21 can be switched to the second connected state. That is, the power supply destination of the distributed power source 1 can be the second power consumer equipment 3B. Therefore, it is possible to suppress the power peak of the second power consumer equipment 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 equipment 3B. If the second contract demand is exceeded and the first predicted demand does not exceed the first contract demand even if there is no power supply from the distributed power source 1 in the first power consumer facility 3A, the distributed power source is used. The supply destination of the electric power generated by 1 is switched from the first electric power consumer equipment 3A to the second electric power consumer equipment 3B. Further, 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. Switch from the electric power consumer equipment 3B of the above to the first electric power consumer equipment 3A. Further, when it is determined in the second power consumer equipment 3B that the second predicted demand does not exceed the second contract demand when the switch 21 is in the second connection state, the supply destination of the distributed power source 1 becomes the second. The second electric power consumer equipment 3B is switched to the first electric power consumer equipment 3A. Therefore, it is necessary to appropriately control the 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 be done.

According to the power system S1, the management control unit 41 generates a 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 a grid interconnection without reverse power flow, the switch 21 is first connected when the switch 21 is in the first connection state. If reverse power flow is likely to occur in the first power consumer equipment 3A and no reverse power flow occurs in the second power consumer equipment 3B, the power supply destination of the distributed power source 1 is set to the second power. It can be a consumer equipment 3B. Therefore, it is possible to suppress the generation of reverse power flow in the first power consumer equipment 3A without suppressing the power generated by the power generation device 11 as much as possible. Further, in the case of grid interconnection without reverse power flow, a reverse power relay is installed in order to prevent reverse power flow to the power system K. The reverse power relay is a protective relay that disconnects each power consumer equipment 3 from the power system K when a reverse power flow is detected. When the reverse power relay is activated, each power consumer facility 3 is disconnected from the power system K, and power cannot be received from the power system K. Therefore, by suppressing the generation of reverse power flow in each electric power consumer facility 3, it is possible to suppress disconnection by the reverse power relay.

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. In this case, even if power is supplied from the distributed power source 1 to the second power consumer equipment 3B, if reverse power flow does not occur in the second power consumer equipment 3B, the supply destination of the distributed power source 1 is The first electric power consumer equipment 3A is switched to the second electric power consumer equipment 3B. Further, when it is determined that reverse power flow may occur in the second power consumer equipment 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 house equipment 3B is switched to the first power consumer equipment 3A. Further, when it is determined that there is no possibility that reverse power flow will occur 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 power demand. The house equipment 3B is switched to the first power consumer equipment 3A. Therefore, it is possible to appropriately control the power interchange between the first power consumer and the second power consumer so as not to suppress the power generation of the distributed power source 1 as much as possible.

According to the power system S1, the switch 21 goes through the non-connected state when switching between the first connected state and the second connected state. If the first connection state and the second connection state are instantaneously switched in the switch 21, the contact c1 and the contact c2 may be electrically connected, for example, due to the generation of an arc. Therefore, there is a possibility that the first electric power consumer equipment 3A (power receiving equipment 32A) and the second electric power consumer equipment 3B (power receiving equipment 32B) are electrically connected. At this time, the power receiving equipment 32A and the power receiving equipment 32B are in a loop connection state via the power system, which causes a short circuit accident. However, since the power system S1 goes through the non-connected state when switching between the first connected state and the second connected state, there is a possibility that the contact c1 and the contact c2 as described above are electrically connected. It can be suppressed and the occurrence of system accidents can be suppressed.

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). , It may be determined whether or not the predetermined demand value specified by the user is exceeded instead of the first contract demand (second contract demand). With this configuration, the first electric power consumer and the second electric power demand so that the electric power demand in each of the first electric power consumer and the second electric power consumer becomes equal to or less than the predetermined demand value. The electric power from the distributed power source 1 can be exchanged with the house.

In the first embodiment, in the second switching instruction signal generation process, the first power consumer depends on whether or not the received power value P3a'(P3'b) is equal to or less than the first threshold value (second threshold value). Although the case where it is determined whether or not there is a possibility that reverse power flow occurs in the equipment 3A (second power consumer equipment 3B) is shown, the method for determining whether or not 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-mentioned two switching instruction signal generation processing, and the switching device 2 switches the connection state of the switching device 21 based on the switching instruction signal. Although the case is shown, it may be configured as follows. For example, the connection state of the switch 21 may be switched at predetermined time zones (such as a break such as morning, day and night, or a break at a predetermined time such as 2 hours and 3 hours). In this case, which connection state is to be set in the switching device 2 or the integrated management device 4 for the predetermined time zone is set in advance. In addition, the output power (output power value P _PV ) from the distributed power supply 1 is displayed, and each power usage status (power consumption values P1a, P1b, supply power) according to the EMS (EMS33A, 33B) of each power consumer equipment 3 is displayed. The display of the values P2a and P2b and the received power values P3a and P3b) may be confirmed so that the first power consumer or the second power consumer manually switches the connection state of the switch 21.

In the first embodiment, when the integrated management device 4 instructs the switching device 21 to switch, the switching instruction signal is transmitted to the switching device 2, but further, the output stop signal is sent to the distributed power source 1. And the output start signal may be transmitted. Specifically, it is processed as follows.

That is, when the integrated management device 4 determines that the switch 21 needs to be switched, it transmits an output stop signal for stopping the output of the 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. The 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 the switching device 21 to switch. Incidentally, the integrated management apparatus 4, when the output power value P _PV received from the distributed power source 1 becomes 0, or when it receives a signal indicating that it has stopped the output from the distributed power supply 1, distributed It is determined that the power output from the power source 1 has stopped. Then, the switch 21 switches between the first connection state and the second connection state via the non-connection state based on the received switching instruction signal. Next, the integrated management device 4 transmits an output start signal for starting the output of electric power to the distributed power source 1 after confirming that the switch 21 has been switched. The integrated management device 4 determines that the switching device 21 has been switched based on the connection status signal received from the switching device 2 or the signal indicating that the switching of the switching device 21 from the switching device 2 is completed. do. The distributed power source 1 starts the output of electric power from the distributed power source 1 based on the received output start signal. The power generation by the power generation device 11 may be started.

As described above, by stopping the distributed power source 1 when switching between the first connection state and the second connection state, 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 equipment 3A, and the second power consumer equipment 3B, so that the first power consumer (1st power consumer) ( The case where the switching of the switching device 2 is controlled according to the power usage status by the power load 31A) and the second power consumer (power load 31B) is shown, but the present invention is not limited to this. For example, the switch 21 may be switched by communication between the first electric power consumer equipment 3A and the second electric power consumer equipment 3B. FIG. 5 shows a power system according to such a modification. The electric power system S1'according to the present modification is different from the electric power system S1 in that it does not include the integrated management device 4.

In the electric power system S1', the distributed power source 1, the switching device 2, the first electric power consumer equipment 3A, and the second electric power consumer equipment 3B are configured to be communicable with each other via the communication network 91. In the electric power system S1'with such a configuration, for example, the first electric power consumer equipment 3A to the second electric power consumer equipment 3B are requested to switch the connection state of the switch 21. Then, the second electric power consumer equipment 3B that receives this request determines whether or not the switch 21 can be switched. Then, when the second electric power consumer equipment 3B determines that the switching is possible, the switching device 2 is instructed to switch the switching device 21, and when it is determined that the switching is not possible, the first electric power consumer equipment 3B is instructed. Notify equipment 3A to that effect. The same applies to the second electric power consumer equipment 3B to the first electric power consumer equipment 3A. Whether or not the connection state is requested to be switched and whether or not the switcher 21 can be switched is determined by whether or not the predicted demand exceeds the contract demand or whether or not reverse power flow is likely to occur. You can make a decision based on whether or not.

For example, the EMS 33B calculates the second predicted demand in the second power consumer equipment 3B, and when the calculated second predicted demand is likely to exceed the second contract demand, the first power consumer equipment 3A ( EMS33A) is requested to supply power from the distributed power source 1. The EMS33A receives a request for power supply from the distributed power source 1 from the second electric power consumer equipment 3B, calculates the first predicted demand in the first electric power consumer equipment 3A, and calculates the first predicted demand. Does not exceed the first contract demand, and sends a switching instruction signal to the switching device 2 so as to switch the switching device 21 from the first connection state to the second connection state. Then, the switching device 2 switches the switching device 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 EMS33A 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 this modification, the EMS 33A corresponds to the "switching instruction unit" described in the claims.

Further, the power system S1'can be configured as follows. That is, the first power consumer equipment 3A uses power in the first power consumer equipment 3A based on the power consumption value P1a, the supply power value P2a, and the received power value P3a input from the power detection unit 321A. Check the situation. Further, the first power consumer equipment 3A acquires the power consumption value P1b, the supply power value P2b, and the received power value P3b from the second power consumer equipment 3B by communication via the communication unit 331A, and is based on these. Then, the power usage status in the second power consumer equipment 3B is confirmed. Subsequently, the EMS 33A of the first electric power consumer equipment 3A determines whether or not it is necessary to switch between the first connection state and the second connection state based on these electric power usage conditions. Then, when the EMS 33A determines that the switching device 21 needs to be switched, the switching device 2 transmits the switching instruction signal, and the switching device 2 connects the switching device 21 based on the received switching instruction signal. Switch states. Whether or not the switch 21 needs to be switched is determined by whether or not the above-mentioned predicted demand exceeds the contract demand (see FIG. 3) or whether reverse power flow is likely to occur (FIG. 4). It may be judged based on (see). In this case, EMS33A corresponds to the "switching instruction unit" described in the claims. Further, in the above, the case where the first electric power consumer equipment 3A determines whether or not the switching device 21 needs to be switched is shown, but conversely, the second electric power consumer equipment 3B determines. You may. In this case, EMS33B corresponds to the "switching instruction unit" described in the claims.

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

In the first embodiment, the case where the power receiving equipments 32A and 32B capable of receiving power from the power system K are provided in the power consumer equipments 3A and 3B is not limited to this. For example, as shown in FIG. 6, the switching device 2 and the power receiving equipment 32A and 32B may be housed in one housing and treated as one power receiving equipment G. Therefore, the power receiving equipment G has two power receiving equipments 32A and 32B, each of which is connected to the power system K, and these are connected by a power line via the switching device 2. Then, the power load 31A in the first power consumer equipment 3A is connected to the power receiving equipment 32A, and the power load 31B in the second power consumer equipment 3B is connected to the power receiving equipment 32B. Further, a distributed power source 1 is connected to the switching device 2 inside the power receiving equipment G. Even if the distributed power source 1 and the power receiving facility G are not installed in any of the buildings A and B and are arranged independently as described above, the power load 31A in the first power consumer And the power supply from the distributed power source 1 can be accommodated in the power load 31B in the second power consumer.

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

The charging / discharging device 13 stores and discharges electric power. The charging / discharging device 13 is a secondary battery such as a lead storage battery, a nickel hydrogen battery, and a lithium ion battery. It may be a lithium ion capacitor, an electric double layer capacitor, or the like. The charging / discharging device 13 is controlled by the power conditioner 12. The power conditioner 12 charges the charging / discharging device 13 by 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 to be the electric power supplied from the distributed power source 1.

Even in the power system S2 configured as described above, a distributed power source is used according to the power usage status of the power load 31A of the first power consumer and the power load 31B of the second power consumer. The power supply destination of 1 is switched between the power receiving equipment 32A and the power receiving equipment 32B. Therefore, the electric power supplied from the distributed power source 1 can be exchanged 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). That is, when the second switching signal generation process is performed, when the integrated management device 4 (management control unit 41) determines in step S21 that the received power value P3a'is equal to or less than the first threshold value, (S21: YES). ), The charging rate of the charging / discharging device 13 is confirmed before performing the process of step S23. Then, 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 to suppress the output power from the distributed power source 1. Let me. As a result, when the received power value P3a'is equal to or higher than the first threshold value, a switching instruction signal for putting the switch 21 into the first connection state is generated. On the other hand, if the received power value P3a'remains equal to or less than the first threshold value even after charging the charging / discharging device 13, the process of step S23 is performed. Further, 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 a full charge or the like, the process of step S23 is performed.

FIG. 8 shows a power system according to a third embodiment of the present disclosure. The electric power system S3 of the present embodiment is different from the electric power system S1 in that it includes three or more electric power consumer facilities 3. In FIG. 8, the power system K, the integrated management device 4, the communication network 91, and the like are not shown.

In the present embodiment, the switch 21 is configured by combining a plurality of switches. As shown in FIG. 8, for example, the switch 21 is configured to have a plurality of SPST (Single Pole, Single Throw) type switches 211. The configuration of the switch 21 shown in FIG. 8 is an example and is not limited thereto. In the switch 21 configured in this way, by making the switch 211 to which the power consumer equipment 3 to which power is to be supplied from the distributed power source 1 connected is made conductive, the distributed power source is supplied to the power consumer equipment 3. The power from 1 can be supplied. In the case of the switch 21 shown in FIG. 8, an interlock function for restricting a plurality of switches 211 from becoming conductive at the same time is provided. Therefore, when the connection state is switched so that only one switch 211 is in the conduction state and only the other switch 211 is in the continuation state, the connection state is set so that all the switches 211 are cut off once. After that, only the other switch 211 is brought into a conductive state.

Further, when a plurality of electric power consumer facilities 3 are provided, it may be necessary to supply electric power from the distributed power source 1 at the same time in the plurality of electric power consumer facilities 3. In preparation for such a case, a priority is set in advance for each electric power consumer equipment 3, and when a plurality of electric power consumer equipment 3 need to supply electric power from the distributed power source 1 at the same time. , The electric power from the distributed power source 1 may be supplied to the electric power consumer equipment 3 having a higher priority set.

Even in the power system S3 configured as described above, the power supply destinations of the distributed power sources 1 are set to a plurality of power sources according to the power usage status of the power consumer equipment 3 (power load) possessed by the plurality of power consumers. It is possible to switch to any of the consumer equipment 3. Therefore, the electric power supplied from the distributed power source 1 can be exchanged among a plurality of electric power consumers.

FIG. 9 shows a power system according to a fourth embodiment of the present disclosure. In the first embodiment and the second embodiment, the case where the electric power is exchanged between the first electric power consumer equipment 3A and the second electric power consumer equipment 3B is shown, but the electric power system of the present embodiment is shown. S4 provides power interchange between a plurality of regions C, each equipped with one or more power consumer equipment 3. FIG. 9 shows the overall configuration of the power system S4. In the electric power system S4, the number of electric power consumer equipment 3 is not limited to that shown in FIG.

In the electric power system S4, one or more electric power consumer facilities 3 are connected to each of the plurality of regions C by the electric 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 area C1. The distributed power source 1 in the present embodiment is a distributed power source having a relatively high power supply capacity such as a mega solar. On the other hand, in the area C2, for example, a distributed power source is not installed due to a restriction that a distributed power source cannot be installed (for example, there is no installation space). Further, in the present embodiment, it is assumed that the power grid 92 in the area C1 and the power network 92 in the area C2 are connected to different power systems K1 and K2, respectively. In addition, these power grids 92 may be connected to the same power system K.

As shown in FIG. 9, each of the plurality of regions C is provided with a CEMS (Community Energy Management System) 6 capable of communicating with a plurality of power consumer facilities 3 and the like in each region C. Each CEMS 6 is a system that comprehensively manages the demand and supply of electric power in each region C. Each CEMS 6 can communicate with the integrated management device 4 via the communication network 91, and transmits information regarding the demand / supply of electric power in each region C to the integrated management device 4.

In the power system S4, by switching the connection state of the switching device 2, the power supply destination of the distributed power source 1 installed in the area C1 is the first connection state in which the power network 92 of the area C1 and the power network 92 of the area C2. It is configured to switch between the second connection state and the second connection state. The electric power system S4 is configured so that the integrated management device 4 switches the connection state of the switching device 2 based on the information regarding the demand / supply of the electric power received from each CEMS 6.

The power system S4 configured as described above switches the connection state of the switching device 2 based on the information on the supply and demand of power in each region C, that is, the power usage status in each region C, so that the region C1 The power supply destination of the distributed power source 1 installed in the region C1 can switch between the first connection state of the power grid 92 of the region C1 and the second connection state of the power grid 92 of the region C2. As a result, for example, when the power consumption in the area C1 is small and the power consumption in the area C2 is large, the output power of the distributed power source 1 installed in the area C1 can be obtained by switching the connection state of the switching device 2. It can be supplied to the power grid 92 in region C2. Further, for example, even if a power failure occurs in the area C2 and the power cannot be received from the power system K2, the output power of the distributed power source 1 installed in the area C1 can be transferred to the area by switching the connection state of the switching device 2. It can be supplied to the power grid 92 of C2. Therefore, in the electric power system S4, electric power can be exchanged among a plurality of regions C.

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

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

The electric power system and the switching device according to the present disclosure are not limited to the above-described embodiment. The specific configuration of each part of the power system and the switching device of the present disclosure can be freely redesigned.

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

Claims (9)

A distributed power source that can supply power,
A first power receiving facility that receives power from the power system and supplies power to the first power load of the first power consumer.
A second power receiving facility that receives power from the power system and supplies power to the second power load of the 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.
Equipped with
The switching device switches between the first connection state and the second connection state according to the first power usage status due to the first power load and the second power usage status due to the second power load. 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 electric power company in the second electric power consumer due to the second electric power usage status. When it is determined that power supply from the distributed power source to the second power receiving facility is necessary, or when the first connection state is used, the first power usage status determines the first . When the electric power received from the electric power system becomes equal to or less than the first threshold value in the electric power consumer of No. 1, and it is determined that it is necessary to suppress the supply of electric power from the distributed power source to the first electric power receiving facility. Switching from the first connection state to the second connection state,
A power system characterized by that. The first monitoring device for acquiring the first power usage status and
The second monitoring device that acquires the second power usage status, and
It is possible to communicate with the switching device, and the switching device is further provided with a switching instruction unit for instructing the switching between the first connection state and the second connection state.
The switching instruction unit has the first connection state and the second connection state 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 from the connection state is transmitted to the switching device, and the switching instruction signal is transmitted.
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. It also has the switching instruction unit, and further includes an integrated management device 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 status and the second power usage status.
The power system according to claim 2. In the switching device, 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 electric power company in the second electric power consumer, and the first one. The electric power consumer switches to the second connection state when the predicted demand at the end of the demand time limit in the second connection state does not exceed the contract demand based on the contract with the electric power company.
The electric power system according to any one of claims 1 to 3. In the switching device, in the first connection state, the electric power received from the electric power system in the first electric power consumer is equal to or less than the first threshold value, and the second electric power consumer has the second power. When the power received from the power system in the connected state is larger than the second threshold value, the second connection state is switched to.
The electric 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 electric power system according to any one of claims 1 to 5. A distributed power source that can supply power,
A first power grid to which one or more first power consumer facilities installed in the first demand area are connected,
A second power grid to which one or more second power consumer facilities installed in the 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 grid and a second connection state in which power is supplied from the distributed power source to the second power grid.
Equipped with
The switching device switches between the first connection state and the second connection state according to the first power usage status in the first demand area and the second power usage status in the second demand area. 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 electric power company in the second demand area due to the second power usage status. When it is determined that power supply from the distributed power source to the second power grid is necessary, or when the first connection state is used, depending on the first power usage status , the first When it is determined that the power received from the power system is equal to or less than the first threshold value in the demand area and it is necessary to suppress the power supply from the distributed power supply to the first power grid, the first connection is made. Switching from the state to the second connection state,
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 a first power receiving facility and a second connection state in which power is supplied from the distributed power source to a second power receiving facility. With a switch,
A switching control unit that controls the switch and switches between the first connection state and the second connection state.
Equipped with
The first power receiving facility receives power from the power system and supplies power to the first power load of the first power consumer.
The second power receiving facility receives power from the power system and supplies power to the second power load of the second power consumer.
The switching control unit sets the first connection state and the second connection state according to the first power usage status due to the first power load and the second power usage status due to the second power load. In the first connection state, depending on the second power usage status , the predicted demand at the end of the demand time limit of the second power consumer changes the contract demand based on the contract with the power company. beyond, when the power supply to the second power receiving equipment from the dispersed type power supply is determined to be necessary, or when the first connection state, by the first power usage, the When the power received from the power system becomes equal to or less than the first threshold value in the first power consumer, and it is determined that it is necessary to suppress the power supply from the distributed power source to the first power receiving facility. , Switching from the first connection state to the second connection state,
A switching device characterized by this. A switch 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 grid and a second connection state in which power is supplied from the distributed power source to a second power grid. When,
A switching control unit that controls the switch and switches between the first connection state and the second connection state.
Equipped with
The first power grid is connected to one or more first power consumer facilities installed in the first demand area.
The second power grid is connected to one or more second power consumer facilities installed in the second demand area.
The switching control unit sets the first connection state and the second connection state according to the first power usage status in the first demand area and the second power usage status in the second demand area. 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 electric power company in the second demand area due to the second power usage status. When it is determined that power supply from the distributed power source to the second power grid is necessary, or when the first connection state is used, the first power usage status determines the first power supply . When the power received from the power system becomes equal to or less than the first threshold value in the demand area of the above and it is determined that it is necessary to suppress the power supply from the distributed power supply to the first power grid, the first Switching from the connection state to the second connection state,
A switching device characterized by this.

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