JP2023019152A - Power supply repeating device and distributed power supply system - Google Patents

Abstract

To provide a power supply repeating device which can effectively use a device having a power supply function.SOLUTION: A power supply repeating device comprises: a power input terminal 21 in which power is input; a power output terminal 22 which outputs the power; a power conversion circuit 23 which is connected between the power input terminal 21 and the power output terminal 22, and performs power conversion processing for converting the power input to the power input terminal 21 into predetermined power and then outputting the converted power to the power output terminal 22; a detection terminal which is connected with an external power detection part 19; and a circuit control unit 25 which controls an operation of the power conversion circuit 23. The circuit control unit 25 is constituted not to perform the power conversion processing in the power conversion circuit 23 when a predetermined processing execution condition including at least a condition regarding whether or not power is supplied to the power detection part 19 is not satisfied, and to perform the power conversion processing in the power conversion circuit 23 when the processing execution condition is satisfied and there is input voltage in the power input terminal 21.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power supply relay device and a distributed power supply system that relay power supply from a power input end to a power output end.

Patent Document 1 (Japanese Patent No. 6289661) describes a distributed power supply system that includes a solar cell, a storage battery, and a power generator. In this distributed power supply system, the power generator is configured to generate power while the current sensor (40) detects a forward power flow during interconnected operation in which power is normally supplied from the power system. . That is, the power generated by the generator is limited to less than the power consumed by the load. In addition, in this distributed power supply system, the surplus power of the power generator can be charged to the storage battery through a path that does not pass through the current sensor (40) during self-sustained operation when the power supply from the power system is not normally performed. As described above, the distributed power supply system described in Patent Document 1 requires a stationary power generation device in addition to the solar battery in order to ensure a sufficient amount of power remaining in the storage battery during self-sustained operation.

Patent Document 2 (Japanese Patent No. 6351351) describes a distributed power supply system to which a storage battery of an electric vehicle can be connected. While the battery of the electric vehicle is connected to the distributed power supply system, the AC power from the commercial grid can be converted into DC power to charge the battery of the electric vehicle, and the DC power from the battery of the electric vehicle can be converted to AC power. It can be converted into electric power and output to the residential side. In this way, the distributed power supply system described in Patent Literature 2 can receive power supply from the storage battery of the electric vehicle when power is required.

Japanese Patent No. 6289661 Japanese Patent No. 6351351

A V2H (Vehicle to Home) system as described in Patent Literature 2 is convenient, but there is a problem that a device for connecting an electric vehicle and a distributed power supply system is expensive.

In addition to electric vehicles, fuel cell vehicles, and plug-in hybrid vehicles, there are many vehicles equipped with electrical outlets capable of outputting AC power. Furthermore, there are many portable power generation devices, power storage devices, and the like that are equipped with electrical outlets capable of outputting AC power. Therefore, it is preferable to be able to receive supply of AC power from such vehicles and devices when there is a shortage of power in the distributed power supply system.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a power supply relay device and a distributed power supply system that can effectively utilize a device having a power supply function.

The characteristic configuration of the power supply relay device according to the present invention for achieving the above object is as follows:
a power input end to which power is input;
a power output end that outputs power;
a power conversion circuit connected between the power input terminal and the power output terminal, and performing power conversion processing to convert the power input to the power input terminal into predetermined power and output the power to the power output terminal;
a sensing end connected to an external power sensing portion;
A circuit control unit that controls the operation of the power conversion circuit based on the input power to the detection end,
The circuit control unit performs the power conversion process in the power conversion circuit when a predetermined process execution condition including at least a condition regarding whether or not power is being supplied to the power detection part is not satisfied. First, the power conversion process is performed in the power conversion circuit when the process execution condition is satisfied and there is an input voltage at the power input terminal.

According to the above characteristic configuration, when a device having a power supply function is connected to the power input terminal, the power supply relay device converts the power input to the power input terminal into predetermined power by the power conversion circuit. can be supplied to the power output. At that time, even if a device having a power supply function is connected to the power input terminal, the circuit control unit does not perform the power conversion process in the power conversion circuit if the process execution condition is not satisfied. Power conversion processing in the power conversion circuit is performed when the execution condition is satisfied. In other words, only when a device having a power supply function is connected to the power input terminal and power needs to be supplied from the device having a power supply function, the power input to the power input terminal is converted to a power conversion circuit. After being converted into a predetermined power, it can be supplied to the power output terminal.
Therefore, it is possible to provide a power supply relay device that can effectively utilize a device having a power supply function.

Another characteristic configuration of the power supply relay device according to the present invention is that the power detection part is supplied with power when the power supply from the power system is normally performed, and the power is supplied from the power system. It is a part to which power is not supplied when the supply is not performed normally,
The processing execution conditions include, as a condition to be satisfied, that power is not being supplied to the power detection portion.

According to the above characteristic configuration, when a device having a power supply function is connected to the power input terminal and power is not normally supplied from the power system, The power is converted into a predetermined power by a power conversion circuit, and then supplied to the power output terminal. In other words, it is possible to effectively utilize the power that is input to the power input terminal from the device having the power supply function during a power failure or the like when the power supply from the power system is not performed normally. In addition, it is ensured that the power supplied by the device with the power supply function does not flow backwards into the power grid.

Still another characteristic configuration of the power supply relay device according to the present invention is that the power detection part is supplied with power when the power supply from the power system is normally performed, and the power is supplied from the power system. A first detection part that does not supply power when power supply is not performed normally, and no power supply when power supply from the power system is performed normally, Having a second detection part that can be supplied with power from another power supply when the power supply from the power system is not performed normally,
The processing execution conditions include conditions to be satisfied that the power conversion processing is not performed in the power conversion circuit and power is supplied to at least one of the first detection portion and the second detection portion. transition from a state in which the power conversion process is not performed in the power conversion circuit and a state in which power is not supplied to both the first detection portion and the second detection portion. at the point.

According to the above characteristic configuration, either power supply from the electric power system capable of supplying power to the first detection portion or power supply by independent operation of a distributed power source or the like capable of supplying power to the second detection portion is performed. When the state changes from a state where both power supply from the power system and power supply by the self-sustained operation of the distributed power supply are not performed, that is, it has a power supply function connected to the power input terminal When there is no power source other than the device, the power input to the power input terminal can be converted to a predetermined power by the power conversion circuit and then supplied to the power output terminal. In addition, it is ensured that the power supplied by the device with the power supply function does not flow backwards into the power grid.
On the other hand, even if a device having a power supply function is connected to the power input terminal, the circuit control unit supplies power from a power system that can supply power to the first detection part and power to the second detection part. When any of the power supply is being performed by the self-sustaining operation of the distributed power supply that can be supplied, the power conversion process in the power conversion circuit is not performed. In other words, it is possible to avoid wasting the power input to the power input terminal from a device having a power supply function.

Still another characteristic configuration of the power supply relay device according to the present invention is that the process execution condition includes, as a condition to be satisfied, a current time within a predetermined process execution time zone in which the power conversion process is allowed to be performed. The point is that it includes

According to the above characteristic configuration, when a device having a power supply function is connected to the power input terminal and the current time is within a predetermined processing execution time zone in which power conversion processing is permitted, Second, the power input to the power input terminal is converted into a predetermined power by the power conversion circuit, and then supplied to the power output terminal. In other words, it is possible to determine the time zone in advance and effectively utilize the power input from the device having the power supply function to the power input terminal.
On the other hand, even if a device having a power supply function is connected to the power input terminal, the circuit control unit is configured to does not perform power conversion processing in the power conversion circuit. In other words, it is possible to avoid wasting the power input to the power input terminal from a device having a power supply function.

Still another characteristic configuration of the power supply relay device according to the present invention is a power generation input terminal to which the power generation device is connected,
When the power is normally supplied to the power detection part, the power detection part is connected to the power output terminal without connecting the power output terminal to the power generation input terminal and not to the power conversion circuit. and a switching unit that connects the power output terminal to the power conversion circuit when power is not normally supplied to the power conversion circuit.

According to the above characteristic configuration, it is possible to switch between a state in which power input to the power input terminal is output to the power output terminal and a state in which power input to the power generation input terminal is output to the power output terminal.

A distributed power supply system according to the present invention is characterized by: the power supply relay device; a distributed power supply; a power conditioner to which the power output terminals of the distributed power supply and the power supply relay device are connected; Power can be supplied from at least one of the power system and the power conditioner when the power supply from the power system is normally performed, and the power supply from the power system is not normally performed. and a power line through which power can be supplied from the power conditioner in some cases.

According to the above characteristic configuration, it is possible to realize a distributed power supply system including a power supply relay device, a distributed power supply, a power conditioner, and a power line.

Another characteristic configuration of the distributed power supply system according to the present invention is that the power supply relay device transmits power supplied from the power line via a receiving line connected to the power line, and is a power supply that can be attached to a power supply target device. a power supply changeover switch for switching between a power supply state in which the power is supplied to a terminal and a non-power supply state in which the power is not supplied to the power supply terminal; The present invention is provided with a switch control section that switches the power supply changeover switch to the non-power supply state when a power supply execution condition is not satisfied.

According to the above characteristic configuration, the power supply relay device has the power supply target device attached to the power supply terminal, and when a predetermined power supply execution condition is satisfied, the power supply relay device connects the power supply target device to the power supply line connected to the power line. can supply the power supplied from the power line through the

Still another characteristic configuration of the distributed power supply system according to the present invention is that the power supply execution condition includes, as a requirement to be satisfied, the current time being within a predetermined power supply execution time zone during which power supply to the power supply terminal is permitted. The point is that it includes

According to the above characteristic configuration, the power supply relay device has a power supply target device attached to the power supply terminal, and when the current time is within a predetermined power supply execution time zone in which power supply to the power supply terminal is permitted, , the power supplied from the power line can be supplied to the power supply target device via a receiving line connected to the power line.

Still another characteristic configuration of the distributed power supply system according to the present invention is that the power detection part is supplied with power when the power supply from the power system is normally performed, and when the power is supplied from the power system A part to which power is not supplied when the power supply is not performed normally,
The power supply execution condition includes, as a requirement to be satisfied, that power is not supplied to the power detection part.

According to the above characteristic configuration, the power supply relay device has the power supply target device attached to the power supply terminal, and when power is not normally supplied from the power system to the power detection part, for example, in the event of a power failure. , the power supplied from the power line can be supplied to the power supply target device via a receiving line connected to the power line.

Still another characteristic configuration of the distributed power supply system according to the present invention is that the distributed power supply has a charging/discharging device,
The power supply execution condition includes, as a requirement to be satisfied, that the remaining amount of electricity stored in the charge/discharge device is equal to or greater than a predetermined value.

According to the above characteristic configuration, in the distributed power supply system including the charging/discharging device as a distributed power supply, the switch control unit controls when the remaining charge of the charging/discharging device is equal to or greater than a predetermined value, i.e., when the distributed power supply system When a large amount of power can be secured, power can be supplied to the power supply target device.

Still another characteristic configuration of the distributed power supply system according to the present invention is that the distributed power supply has a solar cell device,
The power supply execution condition includes, as a requirement to be satisfied, that the power generated by the solar cell device is equal to or greater than a predetermined power.

According to the above characteristic configuration, in the distributed power supply system including the solar battery device as the distributed power supply, the switch control unit controls when the power generated by the solar battery device is equal to or higher than a predetermined power, that is, when the distributed power supply system When power is secured, power can be supplied to the power supply target device.

1 is a diagram showing the configuration of a distributed power supply system provided with a power supply relay device according to a first embodiment; FIG. 1 is a diagram showing the configuration of a distributed power supply system provided with a power supply relay device according to a first embodiment; FIG. 4 is a flowchart for explaining operations performed by a circuit control unit in the power supply relay device of the first embodiment; It is a figure which shows the structure of the distributed power supply system in which the power supply relay apparatus of 2nd Embodiment is provided. It is a figure which shows the structure of the distributed power supply system in which the power supply relay apparatus of 2nd Embodiment is provided. FIG. 10 is a diagram showing the configuration of a distributed power supply system provided with a power supply relay device according to a third embodiment; FIG. 10 is a diagram showing the configuration of a distributed power supply system provided with a power supply relay device according to a third embodiment; FIG. 10 is a diagram showing the configuration of a distributed power supply system provided with a power supply relay device according to a third embodiment; FIG. 11 is a flowchart for explaining operations performed by a circuit control unit in the power supply relay device of the third embodiment; FIG. FIG. 11 is a diagram showing the configuration of a distributed power supply system provided with a power supply relay device according to a fourth embodiment; FIG. 12 is a diagram showing the configuration of a distributed power supply system in which the power supply relay device of the fifth embodiment is provided; It is a figure which shows the structure of the distributed power supply system provided with the power supply relay apparatus of another embodiment.

<First Embodiment>
A power supply repeater 20A (20) according to the first embodiment of the present invention and a distributed power supply system provided with the same will be described below with reference to the drawings.
1 and 2 are diagrams showing the configuration of a distributed power supply system provided with a power supply relay device 20A of the first embodiment. FIG. 1 is a diagram showing a state of a distributed power supply system during interconnected operation to a power system 1. FIG. FIG. 2 is a diagram showing a state of the distributed power supply system during self-sustained operation. In FIGS. 1 and 2, portions to which power is supplied are drawn with thick lines.

As shown in FIGS. 1 and 2, the distributed power supply system includes a power supply relay device 20A, a solar cell device 16 and a charging/discharging device 17 as distributed power sources, a power conditioner 10, and a power line 2. .

A power line 2 to which a power load device 3 is connected is connected to a switching board 4 . The switching board 4 is connected to the power system 1 and the power conditioner 10 . The power load device 3 can receive power supply from at least one of the power system 1 and the power conditioner 10 .

Connected to the power conditioner 10 are a solar cell device 16 and a charging/discharging device 17 as distributed power sources, and a power output end 22 of a power supply relay device 20A. Specifically, the power conditioner 10 includes a DC/DC conversion unit 13 to which the solar cell device 16 is connected, a DC/DC conversion unit 14 to which the charging/discharging device 17 is connected, and power of the power supply relay device 20A. and a DC/DC converter 15 connected to the output terminal 22 . In addition, the power conditioner 10 is connected to each of the DC/DC converters 13, 14, and 15, and has an inverter 12 that converts the DC power into AC power, and a switch 11 that is connected to the AC side of the inverter 12. and The switch 11 has a contact a connected to the AC side of the inverter 12 , a contact b connected to the interconnection line 8 , and a contact c connected to the independent line 9 .

The interconnection line 8 is a line that is electrically connected to the power system 1 when power is normally supplied from the power system 1 . The stand-alone line 9 is a line that is electrically disconnected from the power system 1 and can be supplied with power from another power supply when the power supply from the power system 1 is not normally performed.

The switch 11 is in a state in which the contact a and the contact b are connected, that is, a state in which the power conditioner 10 is connected to the interconnecting line 8, and a state in which the contact a and the contact c are connected, that is, a power The state is switched between the state in which the conditioner 10 is connected to the self-supporting line 9 . Although detailed description is omitted, the switch 11 is in a connected state in which the contacts a and b are connected as shown in FIG. 1 when the power supply from the power system 1 is normally performed. When the power supply from the electric power system 1 is not normally performed, the state is switched to the self-sustaining state in which the contacts a and c are connected as shown in FIG.

The switching board 4 has a breaker 5 , a breaker 6 and a switch 7 . The switch 7 has a contact a connected to the power line 2 , a contact b connected to the power system 1 side, and a contact c connected to the independent line 9 . The switch 7 is in a state in which the contact a and the contact b are connected, that is, the state in which the power line 2 is connected to the power system 1 side, and a state in which the contact a and the contact c are connected, that is, The power line 2 is switched between a state in which it is connected to the self-supporting line 9 . Although detailed description is omitted, the switch 7 is in a connected state in which the contact a and the contact b are connected as shown in FIG. 1 when power is normally supplied from the power system 1. When the power supply from the electric power system 1 is not normally performed, the state is switched to the self-sustaining state in which the contacts a and c are connected as shown in FIG. In this way, the power line 2 can receive power from at least one of the power system 1 and the power conditioner 10 when the power supply from the power system 1 is normally performed. is not normally supplied, power can be supplied from the power conditioner 10 .

The solar cell device 16 is a device that receives sunlight and generates power. The charging/discharging device 17 is a device capable of discharging electric power stored in an electric storage unit (not shown) and charging the electric storage unit with electric power. The power conditioner 10 controls an operation of receiving power generated by the solar cell device 16, an operation of charging and discharging power by the charging/discharging device 17, an operation of outputting power to the interconnection line 8 or the independent line 9, and the like. In addition, the power conditioner 10 controls the operation of receiving power from the power supply relay device 20A.

The power supply relay device 20A is connected to a power input end 21 to which power is input, a power output end 22 to output power, and is connected between the power input end 21 and the power output end 22, and is input to the power input end 21. A power conversion circuit 23 that performs power conversion processing to convert the obtained power into a predetermined power and output it to the power output end 22, a detection end 24 connected to an external power detection part 19, and an input to the detection end 24 and a circuit control unit 25 that controls the operation of the power conversion circuit 23 based on the power. The power detection part 19 is provided on the interconnection line 8 , and the power detection part 19 and the detection end 24 are connected by the interconnection detection line 18 . The power conversion circuit 23 has its operation controlled by the circuit control unit 25 , converts AC power supplied from the power input terminal 21 into predetermined DC power, and outputs the DC power to the power output terminal 22 .

In addition, the power supply relay device 20A includes a power supply unit 26 connected to the power input terminal 21, and uses power supplied via the power supply unit 26, that is, power input to the power input terminal 21. works. Therefore, when power is not input to the power input terminal 21, the circuit control unit 25 of the power supply relay device 20A does not operate, so the power conversion process in the power conversion circuit 23 is not performed.

Various types of power supply devices 41 can be attached and detached to terminals 40 connected to the power input end 21 . For example, the power supply device 41 is an electric vehicle having a power storage device, a fuel cell vehicle having a fuel cell, or the like. In addition, the power supply device 41 may be a vehicle equipped with an electrical outlet capable of outputting AC power, a portable power generation device, a portable power storage device, or the like. In this embodiment, the case where the power supply device 41 outputs AC power is illustrated. When the terminal 40 connected to the power input terminal 21 is connected to the power supply device 41 , the power input from the power supply device 41 to the power input terminal 21 is supplied to the circuit control section 25 via the power supply section 26 . , is supplied to the power conversion circuit 23 . For example, the user attaches an electrical plug as the terminal 40 to an electrical outlet of AC 100V installed in the vehicle as the power supply device 41, and the power supplied from the vehicle is supplied via the power supply relay device 20A. Conceivable forms are those provided in a distributed power supply system.

FIG. 3 is a flowchart for explaining the operation performed by the circuit control section 25 in the power supply relay device 20A of the first embodiment. The circuit control unit 25 repeats this flow chart when receiving power supply through the power supply unit 26 . That is, this flowchart is performed when the power supply device 41 is connected to the power input terminal 21 . On the other hand, when the power supply device 41 is not connected to the power input terminal 21, the circuit control section 25 cannot receive power supply and is not operating.

In step #10, the circuit control unit 25 determines whether predetermined processing execution conditions including at least a condition regarding whether power is being supplied to the power detection unit 19 are satisfied. In the case of the present embodiment, the processing execution conditions include that power is not being supplied to the power detection unit 19 as a condition to be satisfied. That is, the circuit control unit 25 determines that the process execution condition is satisfied when the power detection part 19 is not supplied with power. Then, when the process execution condition is satisfied, that is, when power is not being supplied to the power detection unit 19, the circuit control unit 25 proceeds to step #11, and power is not supplied to the power detection unit 19. If it has been done, the process moves to step #12.

In step # 11 , the circuit control unit 25 executes power conversion processing in the power conversion circuit 23 . That is, the circuit control unit 25 performs power conversion processing in the power conversion circuit 23 when power is not normally supplied to the power detection part 19 and there is an input voltage at the power input terminal 21 .

Further, in step #12, the circuit control unit 25 does not execute the power conversion process in the power conversion circuit 23. FIG. In other words, even if there is an input voltage at the power input terminal 21, the circuit control unit 25 does not perform power conversion processing in the power conversion circuit 23 when power is normally supplied to the power detection part 19. .

As described above, in the present embodiment, the circuit control unit 25 does not perform power conversion processing in the power conversion circuit 23 when power is normally supplied to the power detection unit 19, and the power detection unit 19 When power is not normally supplied to the power input terminal 21 and there is an input voltage at the power input terminal 21, the power conversion circuit 23 performs power conversion processing. In this embodiment, the power detection part 19 is provided in the interconnection line 8 . That is, the power detection part 19 is supplied with power when the power supply from the power system 1 is normally performed, and when the power supply from the power system 1 is not normally performed, the power detection part 19 detects the power. is not supplied. Therefore, when power is supplied to the interconnection line 8 as shown in FIG. If power is not supplied to the interconnecting line 8 at this time, the circuit control unit 25 determines that power is not normally supplied to the power detection part 19 .

In the interconnected state shown in FIG. 1 , if the solar cell device 16 is generating power, the generated power is supplied to at least one of the charging/discharging device 17 and the interconnecting line 8 via the power conditioner 10 . Also, the power supplied from the charging/discharging device 17 may be supplied to the interconnection line 8 via the power conditioner 10 . In this case, even if the power supply device 41 is connected to the power input terminal 21 and receives the power through the power supply unit 26 , the circuit control unit 25 does not perform power conversion processing in the power conversion circuit 23 . In other words, power supply from the power supply relay device 20A to the power conditioner 10 is not performed.

In the self-sustained state shown in FIG. 2 , if the solar cell device 16 is generating power, the generated power is supplied to at least one of the charging/discharging device 17 and the self-sustaining line 9 via the power conditioner 10 . Also, the power supplied from the charging/discharging device 17 may be supplied to the self-supporting line 9 via the power conditioner 10 . Furthermore, the power supplied from the power supply device 41 may be supplied to at least one of the self-supporting line 9 and the charging/discharging device 17 via the power conditioner 10 . In this case, when the power supply device 41 is connected to the power input terminal 21 and receives power through the power supply unit 26 , the circuit control unit 25 performs power conversion processing in the power conversion circuit 23 . That is, power is supplied from the power supply relay device 20A to the power conditioner 10 .

As described above, when the power supply device 41 having a power supply function is connected to the power input terminal 21 , the power supply relay device 20A converts the power input to the power input terminal 21 into a predetermined power in the power conversion circuit 23 . , and then supplied to the power output end 22 . At that time, even if the power supply device 41 having a power supply function is connected to the power input terminal 21, the circuit control unit 25 causes the power conversion process in the power conversion circuit 23 to be performed when the process execution condition is not satisfied. is not performed, and the power conversion process in the power conversion circuit 23 is performed when the process execution condition is satisfied. That is, the power supply device 41 having a power supply function is connected to the power input terminal 21, and the power is input to the power input terminal 21 only when power supply from the power supply device 41 having a power supply function is required. The power can be converted into a predetermined power by the power conversion circuit 23 and then supplied to the power output end 22 .

<Second embodiment>
The power supply relay device 20B (20) and the distributed power supply system of the second embodiment differ from the above embodiments in that they include a power generation input terminal 27 to which a power generation device is connected. A power supply relay device 20B and a distributed power supply system according to the second embodiment will be described below, but descriptions of the same configurations as in the above embodiment will be omitted.

4 and 5 are diagrams showing the configuration of a distributed power supply system in which the power supply relay device 20B of the second embodiment is provided. FIG. 4 is a diagram showing a state of the distributed power supply system during interconnection operation to the power system 1. As shown in FIG. FIG. 5 is a diagram showing the state of the distributed power supply system during self-sustained operation. In FIGS. 4 and 5, portions to which power is supplied are drawn with thick lines.

The power conditioner 10 includes a DC/DC converter 14 to which the charging/discharging device 17 is connected, and a DC/DC converter 15 to be connected to the power output end 22 of the power supply relay device 20B. In addition, the power conditioner 10 includes an inverter 12 connected to the DC/DC converters 14 and 15 to convert the DC power into AC power, and a switch 11 connected to the AC side of the inverter 12. Prepare.

The power supply relay device 20B has a power generation input end 27 to which the solar cell device 16 as a power generation device is connected, and a power output end 22 when power is normally supplied to the power detection portion 19. When the input terminal 27 is connected and the power output terminal 22 is not connected to the power conversion circuit 23 and the power is not normally supplied to the power detection part 19, the power output terminal 22 is connected to the power conversion circuit 23. and a switching unit 28 for connection.

The switching unit 28 included in the power supply relay device 20B has a switch 28a and a coil 28b. The coil 28 b of the switching section 28 is electrically connected to the interconnection detection line 18 connected to the power detection portion 19 . In the switching unit 28 , the contact a of the switch 28 a is connected to the power output terminal 22 , the contact c of the switch 28 a is connected to the power generation input terminal 27 , and the contact b of the switch 28 a is connected to the power conversion circuit 23 . The power output end 22 is connected to the power conditioner 10 and the power generation input end 27 is connected to the solar cell device 16 .

During the interconnected operation shown in FIG. 4, the coil 28b of the switching unit 28 is energized by the power supplied from the interconnecting line 8, and as a result, the contact a and the contact c of the switch 28a of the switching unit 28 are connected. The solar cell device 16 is connected to the DC/DC converter 15 of the power conditioner 10 via the power generation input terminal 27, the contacts c and a of the switch 28a, and the power output terminal 22. FIG.

During the self-sustained operation shown in FIG. 5, power is not supplied from the interconnection line 8, so the coil 28b of the switching unit 28 is not energized, and as a result, the contact a and the contact b of the switch 28a of the switching unit 28 are connected. The power conversion circuit 23 is connected to the DC/DC converter 15 of the power conditioner 10 via the contacts b and a of the switch 28a and the power output terminal 22. FIG.

In this manner, the switching unit 28 connects the power output end 22 to the power generation input end 27 and connects the power output end 22 to the power conversion circuit 23 when power is normally supplied to the power detection portion 19 . is not connected to the power detection part 19 and the power supply to the power detection part 19 is not performed normally, the power output end 22 is connected to the power conversion circuit 23 .

<Third Embodiment>
The power supply relay device 20C (20) and the distributed power supply system of the third embodiment differ from the above embodiment in the method of receiving power supply. A power supply relay device 20C and a distributed power supply system according to the third embodiment will be described below, but descriptions of the same configurations as in the above embodiments will be omitted.

6 to 8 are diagrams showing the configuration of a distributed power supply system provided with a power supply repeater 20C of the third embodiment.
FIG. 6 is a diagram showing a state in which the power supply device 41 is not connected to the power input terminal 21 during the interconnected operation of the distributed power supply system to the power system 1 . FIG. 7 is a diagram showing a state in which the power supply device 41 is not connected to the power input terminal 21 during the self-sustained operation of the distributed power supply system. FIG. 8 is a diagram showing a state in which the power supply device 41 is connected to the power input terminal 21 during the self-sustained operation of the distributed power supply system. In FIGS. 6 to 8, portions to which power is supplied are drawn with thick lines.

The power supply relay device 20C connects the power output end 22 to the power generation input end 27 when power is normally supplied to the power generation input end 27 to which the power generation device is connected and to the power detection portion 19. and a switching unit 30 that connects the power output end 22 to the power conversion circuit 23 when the power output end 22 is not connected to the power conversion circuit 23 and power is not normally supplied to the power detection part 19; Prepare.

The switching unit 30 included in the power supply relay device 20C is configured using two magnetic contactors 30a and 30b. The circuit control unit 25 switches between the conducting state and the non-conducting state of the magnet contactors 30a and 30b. The power conversion circuit 23 is connected to the power output terminal 22 when the magnetic contactor 30a is in a conducting state, and the power conversion circuit 23 is connected to the power output terminal 22 when the magnetic contactor 30a is in a non-conducting state. Not connected. The solar cell device 16 is connected to the power output end 22 when the magnetic contactor 30b is in a conducting state, and the solar cell device 16 is connected to the power output end 22 when the magnetic contactor 30b is in a non-conducting state. Not connected.

The power supply unit 26 can receive power supply from the power switching unit 29 . The power switching unit 29 has a switch 29a and a coil 29b. A coil 29 b of the power switching unit 29 is connected to the power input terminal 21 . The contact a of the switch 29a is connected to the power supply unit 26, the contact c of the switch 29a is connected to the power input terminal 21, and the contact b of the switch 29a is connected to the independent terminal 36 of the power supply relay device 20C. 36 is connected to the freestanding line 9 via a connecting line 35 . As shown in FIGS. 6 and 7, when the power supply device 41 is not connected to the power input terminal 21, the coil 29b is not energized, so the contacts a and b of the switch 29a are connected. On the other hand, as shown in FIG. 8, when the power supply device 41 is connected to the power input terminal 21, the coil 29b is energized, so that the contacts a and c of the switch 29a are connected.

6, the power supply device 41 is not connected to the power input end 21, and the self-supporting line 9 is not energized. Since power is not supplied to the power supply unit 26, the power supply relay device 20C cannot operate. In this case, both the magnetic contactors 30a and 30b are in a non-conducting state.

In the case of self-sustained operation shown in FIG. 7, the power supply device 41 is not connected to the power input terminal 21, but the self-sustained line 9 is energized. Since power is supplied from the self-supporting line 9 to the power supply unit 26 via the communication line 35, the self-supporting end 36, and the power switching unit 29, the power supply relay device 20C can operate. In this case, the circuit control unit 25 switches the magnet contactor 30a to the non-conducting state and switches the magnet contactor 30b to the conducting state. As a result, power supplied from the solar cell device 16 is supplied to the power conditioner 10 .

8, the power supply device 41 is connected to the power input end 21, and the self-supporting line 9 is energized. Power is supplied from the power input terminal 21 to the power supply unit 26, and the power supply relay device 20C can operate. In addition, there is also an input voltage on the input side (AC side) of the power conversion circuit 23 . In this case, the circuit control unit 25 switches the magnet contactor 30a to the conducting state and switches the magnet contactor 30b to the non-conducting state. As a result, power supplied from the power supply device 41 is supplied to the power conditioner 10 .

FIG. 9 is a flowchart for explaining the operation performed by the circuit control unit 25 in the power supply relay device 20C of the third embodiment. The circuit control unit 25 repeats this flow chart when receiving power supply through the power supply unit 26 . It should be noted that, as shown in FIG. 6, when the circuit control unit 25 is not supplied with power, the circuit control unit 25 cannot operate, so this flow chart is not performed.

In the case of this embodiment, the power supply unit 26 can receive power supply from the power supply device 41 connected to the power input end 21 or the self-supporting line 9 via the power supply switching unit 29 . Therefore, even if the circuit control unit 25 is supplied with power, the power supply device 41 may not be connected to the power input terminal 21 . Therefore, in step #20, the circuit control section 25 determines whether or not the power input terminal 21 has an input voltage. For example, when there is an input voltage on the input side (that is, the AC side) of the power conversion circuit 23, the circuit control unit 25 determines that there is an input voltage on the power input terminal 21, proceeds to step #21, and performs power conversion. If there is no input voltage on the input side (that is, AC side) of the circuit 23, it is determined that there is no input voltage on the power input terminal 21, and the process proceeds to step #23.

In step #21, the circuit control unit 25 determines whether predetermined processing execution conditions including at least a condition regarding whether power is being supplied to the power detection unit 19 are satisfied. In the case of the present embodiment, the processing execution conditions include that power is not being supplied to the power detection unit 19 as a condition to be satisfied. That is, the circuit control unit 25 determines that the process execution condition is satisfied when the power detection part 19 is not supplied with power. Then, when the processing execution condition is satisfied, that is, when power is not being supplied to the power detection unit 19, the circuit control unit 25 proceeds to step #22, and power is not supplied to the power detection unit 19. If it has been done, the process moves to step #23.

In step # 22 , the circuit control unit 25 causes the switching unit 30 to connect the power conversion circuit 23 to the power output terminal 22 and disconnect the power generation input terminal 27 to the power output terminal 22 . In addition, the circuit control unit 25 executes power conversion processing in the power conversion circuit 23 . In other words, the circuit control unit 25 detects that power is not normally supplied to the power detection part 19 (i.e., if "Yes" in step #21) and that there is an input voltage at the power input terminal 21 (i.e. , "Yes" in step #20), the power conversion process in the power conversion circuit 23 is performed. This state corresponds to the state shown in FIG.

In step # 23 , the circuit control unit 25 causes the switching unit 30 to connect the power generation input terminal 27 to the power output terminal 22 without connecting the power conversion circuit 23 to the power output terminal 22 . In addition, the circuit control unit 25 does not execute power conversion processing in the power conversion circuit 23 . In other words, the circuit control unit 25 detects when power is normally supplied to the power detection part 19 (that is, when "No" in step #21), or when there is no input voltage at the power input terminal 21. (That is, if "No" in step #20), power conversion processing in the power conversion circuit 23 is not performed.

<Fourth Embodiment>
The power supply relay device 20D (20) and the distributed power supply system of the fourth embodiment differ from the above embodiments in that they have a function of supplying power to the power supply target device. A power supply relay device 20D and a distributed power supply system according to the fourth embodiment will be described below, but descriptions of the same configurations as in the above embodiments will be omitted.

FIG. 10 is a diagram showing the configuration of a distributed power supply system provided with a power supply relay device 20D of the fourth embodiment. As illustrated, the power supply relay device 20</b>D includes a power supply changeover switch 31 and a switch control section 32 .

The power supply changeover switch 31 supplies power supplied from the power line 2 via a receiving line 37 connected to the power line 2 to a power supply terminal 38 that can be attached to a power supply target device. It switches between a non-powered state in which no power is supplied. In the example shown in FIG. 10, the contact a of the power supply changeover switch 31 is connected to the power receiving end 34 provided in the power supply relay device 20D. The power receiving end 34 is connected to the power line 2 between the switching board 4 and the power load device 3 via the power receiving line 37 . In this embodiment, power is supplied to the power line 2 both during grid-connected operation and during isolated operation. Therefore, power is also supplied to the power supply changeover switch 31 during both the grid-connected operation and the isolated operation. A contact b of the power supply changeover switch 31 is connected to a power supply terminal 33 provided in the power supply relay device 20D. The power supply end 33 is connected to a power supply terminal 38, and a power supply device 41 as a power supply target device can be connected to the power supply terminal 38. FIG. The power supply device 41 as a power supply target device is, for example, an electric vehicle equipped with a power storage device, a portable power storage device, or the like. When the contact a and the contact b of the power supply selector switch 31 are connected, the power supply state is set, and when the contact a and the contact b of the power supply selector switch 31 are not connected, the non-power supply state is set. become. For example, the user attaches the power supply terminal 38 to a power supply port mounted on a vehicle as the power supply device (power supply target device) 41, and the power supplied from the power line 2 is switched to the power supply relay device 20D. A form in which the signal is provided to the vehicle via the switch 31 is conceivable.

The switch control unit 32 switches the power supply changeover switch 31 to the power supply state when a predetermined power supply execution condition is satisfied, and switches the power supply changeover switch 31 to the non-power supply state when the power supply execution condition is not satisfied. Power is supplied from the power line 2 to the switch control unit 32 . The content of the power supply execution condition can be set as appropriate.

Specifically, the power supply execution condition may include, as a requirement to be satisfied, that the current time is within a predetermined power supply execution time zone in which power supply to the power supply terminal 38 is permitted. For example, the power supply execution time period is from 7:00 to 17:00. Since the solar cell device 16 generates power during this time period, it is expected that the power received from the power system 1 will not become excessive even if power is supplied to the power supply device 41 .

Alternatively, the power supply execution condition may include that power is not being supplied to the power detection portion 19 as a requirement to be satisfied. In this embodiment, the switch control unit 32 receives input power to the detection end 24 , that is, information for determining whether or not power is being supplied to the power detection part 19 . As a result, the switch control unit 32 can determine whether or not the power supply from the power system 1 is normally performed. In the case shown in FIG. 10 , the power supply from the power system 1 is not normally performed, so the switch control unit 32 determines that the power supply execution condition is satisfied.

<Fifth Embodiment>
The content of the power supply execution condition described above can be changed as appropriate. A power supply relay device 20D and a distributed power supply system according to the fifth embodiment will be described below, but descriptions of the same configurations as in the above embodiments will be omitted.

FIG. 11 is a diagram showing the configuration of a distributed power supply system provided with a power supply relay device 20D of the fifth embodiment. As illustrated, the information communication device 42 can collect information from the solar cell device 16 and the charging/discharging device 17 and transmit the information to the power supply relay device 20D. The information communication device 42 is, for example, a HEMS (Home Energy Management System) or the like, which is a device for controlling the operation of a device to be controlled (that is, the power supply relay device 20D, the solar cell device 16, the charging/discharging device 17, etc.). It is possible to perform information communication with the target device via the communication line, receive information from each device, and transmit information to each device. In the case of this embodiment, the information communication device 42 collects information about the remaining amount of electricity stored in the charging/discharging device 17 as a distributed power source and information about the power generated by the solar cell device 16 as a distributed power source, and supplies power. It is transmitted to the relay device 20D.

The power supply execution condition described above includes, as a requirement to be satisfied, that the remaining amount of electricity stored in the charging/discharging device 17 is equal to or greater than a predetermined value. That is, the switch control unit 32 switches the power supply changeover switch 31 to the power supply state when the remaining amount of electricity stored in the charge/discharge device 17 to be transmitted is equal to or greater than a predetermined value (that is, when the power supply execution condition is satisfied). When the power supply to the device 41 is enabled and the remaining amount of electricity stored in the charge/discharge device 17 is less than a predetermined value (that is, when the power supply execution condition is not satisfied), the power supply changeover switch 31 is switched to the non-power supply state. to prohibit the power supply to the power supply device 41 .

Further, the power supply execution condition may include, as a requirement to be satisfied, that the power generated by the solar cell device 16 is equal to or greater than a predetermined power. In other words, the switch control unit 32 switches the power supply changeover switch 31 to the power supply state when the transmitted power generated by the solar cell device 16 is equal to or greater than the predetermined power (that is, when the power supply execution condition is satisfied). 41, and when the power generated by the solar cell device 16 is less than the predetermined power (that is, when the power supply execution condition is not satisfied), the power supply changeover switch 31 is switched to the non-power supply state to turn off the power supply. The power supply to the device 41 is prohibited.

<Another embodiment>
<1>
In the above embodiment, the power supply relay device 20 and the distributed power supply system of the present invention have been described with specific examples, but the configuration can be changed as appropriate.
For example, the number of solar cell devices 16 and the like connected to the power conditioner 10 is not limited to the above example, and can be changed as appropriate.
Although the solar cell device 16 and the charging/discharging device 17 are illustrated as distributed power sources, other power sources may be used.

Further, the power supply relay device 20 may be provided with a switch for switching between the conducting state and the non-conducting state between the power input terminal 21 and the power conversion circuit 23 . If the process execution condition is not satisfied, the switch is switched to a non-conducting state so that the power conversion process is not performed in the power conversion circuit 23, and the process execution condition is satisfied and the power input terminal 21 When there is an input voltage, the power conversion circuit 23 may be configured to perform power conversion processing by switching the switch to the conductive state.

<2>
In the above embodiment, the content of the process execution condition can be changed as appropriate.
To give a specific example, the process execution conditions include conditions to be met such that power is not being supplied to the power detection unit 19, and that the current time is a predetermined process that allows power conversion. It may include being in an execution time zone. For example, in the storage unit (not shown) of the power supply relay device 20D, the processing execution time periods during which the power conversion processing is permitted are, for example, from 19:00 to 24:00 and from 00:00 to 5:00. , etc., power conversion processing in the power conversion circuit 23 is not performed outside of that time zone.

<3>
In the above embodiment, a plurality of power sensing portions 19, 43 may be provided.
FIG. 12 is a diagram showing the configuration of a distributed power supply system provided with a power supply relay device 20E (20) of another embodiment. As shown in the figure, the power detection part is supplied with power when the power supply from the power system 1 is normally performed, and is detected when the power supply from the power system 1 is not normally performed. is the first detection portion 19 where power is not supplied, and when power is normally supplied from the power system 1, power is not supplied, and power is normally supplied from the power system 1. It has a second sensing portion 43 that can be powered from another power supply if it is not. A first detection portion 19 as a power detection portion is provided on the interconnection line 8 , and the first detection portion 19 and the detection end (first detection end) 24 are connected by the interconnection detection line 18 . A second detection portion 43 as a power detection portion is provided on the self-supporting wire 9 , and the second detection portion 43 and the detection end (second detection end) 44 are connected by the self-supporting detection line 39 .

The processing execution conditions include conditions to be satisfied such that power conversion processing is not performed in the power conversion circuit 23 and power is supplied to at least one of the first detection portion 19 and the second detection portion 43. It includes transition from the state where the power conversion circuit 23 is not performing power conversion processing and power is not being supplied to both the first detection portion 19 and the second detection portion 43 .

For example, when the power supply from the power conditioner 10 to the self-sustained line 9 is interrupted due to the charging/discharging device 17 becoming unable to discharge and the solar cell device 16 becoming unable to generate power during self-sustained operation, the circuit control unit 25 , it is determined that the process execution condition is satisfied. In such a case, power is supplied from the power supply device 41 to the power conditioner 10 via the power supply relay device 20</b>E, and the power is supplied to the power load device 3 . When the circuit control unit 25 determines that the processing execution condition is satisfied and starts supplying power from the power supply device 41 to the power conditioner 10, the circuit control unit 25 may perform control to continue the power supply for a certain period of time. .

<4>
Although some examples of processing execution conditions have been illustrated in the above embodiments, these conditions may be used alone, or these conditions may be used in combination.

<5>
Although some examples of power supply execution conditions have been illustrated in the above embodiments, these conditions may be used alone, or these conditions may be used in combination.

<6>
It should be noted that the configurations disclosed in the above embodiments (including other embodiments, the same shall apply hereinafter) can be applied in combination with configurations disclosed in other embodiments as long as there is no contradiction. The embodiments disclosed in this specification are exemplifications, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the object of the present invention.

INDUSTRIAL APPLICABILITY The present invention can be used for power supply relay devices and distributed power supply systems that can effectively utilize devices having power supply functions.

1 power system 16 solar cell device 17 charge/discharge device 18 interconnection detection line 19 power detection part (first detection part)
20 power supply relay device 21 power input end 22 power output end 23 power conversion circuit 24 detection end (first detection end)
25 circuit control unit 26 power supply unit 27 power generation input terminal 28 switching unit 30 switching unit 31 power supply changeover switch 32 switch control unit 38 power supply terminal 40 terminal 41 power supply device (power supply target device)
43 power detection part (second detection part)
44 detection end (second detection end)

Claims (11)

a power input end to which power is input;
a power output end that outputs power;
a power conversion circuit connected between the power input terminal and the power output terminal, and performing power conversion processing to convert the power input to the power input terminal into predetermined power and output the power to the power output terminal;
a sensing end connected to an external power sensing portion;
A circuit control unit that controls the operation of the power conversion circuit based on the input power to the detection end,
The circuit control unit performs the power conversion process in the power conversion circuit when a predetermined process execution condition including at least a condition regarding whether or not power is being supplied to the power detection part is not satisfied. First, a power supply relay device configured to perform the power conversion process in the power conversion circuit when the process execution condition is satisfied and an input voltage is present at the power input terminal. The power detection part is supplied with power when the power supply from the power system is normally performed, and is not supplied with power when the power supply from the power system is not normally performed. It is a part that is not performed,
2. The power supply relay device according to claim 1, wherein said processing execution conditions include, as a condition to be satisfied, that power is not being supplied to said power detection part. The power detection part is supplied with power when the power supply from the power system is normally performed, and is not supplied with power when the power supply from the power system is not normally performed. The first detection part that is not performed, and the power supply is not performed when the power supply from the power system is normally performed, and when the power supply from the power system is not performed normally has a second sensing portion that can be powered by another power source,
The processing execution conditions include conditions to be satisfied that the power conversion processing is not performed in the power conversion circuit and power is supplied to at least one of the first detection portion and the second detection portion. transition from a state in which the power conversion process is not performed in the power conversion circuit and a state in which power is not supplied to both the first detection portion and the second detection portion. The power supply relay device according to claim 1. 4. The process execution condition according to any one of claims 1 to 3, which includes, as a condition to be satisfied, that the current time is within a predetermined process execution time zone in which the power conversion process is permitted. power supply repeater. a power generation input terminal to which the power generation device is connected;
When the power is normally supplied to the power detection part, the power detection part is connected to the power output terminal without connecting the power output terminal to the power generation input terminal and not to the power conversion circuit. The power supply relay device according to any one of claims 1 to 4, further comprising a switching unit that connects the power output end to the power conversion circuit when power is not normally supplied to the power supply relay device. a power supply relay device according to any one of claims 1 to 5;
a distributed power source;
a power conditioner to which the distributed power source and the power output terminal of the power supply relay device are connected;
When the power supply from the power system is normally performed, the power can be supplied from at least one of the power system and the power conditioner, and the power supply from the power system is normally performed. and a power line capable of receiving power from the power conditioner when it is not present. The power supply relay device supplies power supplied from the power line via a receiving line connected to the power line to a power supply terminal attachable to a power supply target device, and supplies the power to the power supply terminal. a power supply changeover switch for switching between a non-power supply state and a non-power supply state, and the power supply changeover switch is switched to the power supply state when a predetermined power supply execution condition is satisfied, and the power supply changeover switch is switched to the non-power supply state when the power supply execution condition is not satisfied. 7. The distributed power supply system according to claim 6, comprising a switch control unit for switching to a power supply state. 8. The distributed power supply system according to claim 7, wherein the power supply execution condition includes, as a requirement to be satisfied, that the current time is within a predetermined power supply execution time zone in which power supply to the power supply terminal is permitted. The power detection part is supplied with power when the power supply from the power system is normally performed, and is not supplied with power when the power supply from the power system is not normally performed. It is a part that is not performed,
9. The distributed power supply system according to claim 7, wherein said power supply execution condition includes, as a requirement to be satisfied, that power is not being supplied to said power detection part. The distributed power supply has a charging/discharging device,
10. The distributed power supply system according to any one of claims 7 to 9, wherein the power supply execution condition includes, as a requirement to be satisfied, that the remaining amount of electricity stored in the charge/discharge device is equal to or greater than a predetermined value. the distributed power source comprises a solar cell device;
11. The distributed power supply system according to any one of claims 7 to 10, wherein the power supply execution condition includes, as a requirement to be satisfied, that the power generated by the solar cell device is equal to or greater than a predetermined power.

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