JP2020137210A - Distributed power supply system - Google Patents

Abstract

To provide a distributed power supply system capable of accurately identifying from which power generator the electric power for the inverse current flow against an electric power system is supplied.SOLUTION: A distributed power supply system is given in which a second power generator 4 is activated, when a link through a second linking line 16 with an electric power system 1 is interrupted, in a second autonomous operation mode where output power is adjusted while the power is output to a second autonomous line 17, and a power conditioner 7 is activated, when the power supply from the electric power system 1 to a power line 2 is normally performed and the power supply from the second generator 4 to the second autonomous line 17 is performed, in a first special operation mode where output power is adjusted while the power is not output to a first linking line 14 and output to a first autonomous line 15.SELECTED DRAWING: Figure 3

Description

The present invention relates to a distributed power supply system including a power line connected to a power system, a first power generation device, and a second power generation device.

Patent Document 1 describes a distributed power generation system including a power line connected to an electric power system, a photovoltaic power generation device, a charging / discharging device, and a power generation device (fuel cell power generation unit) different from the photovoltaic power generation device. Is described. When the side of the power line toward the power system is the upstream side and the side away from the power system is the downstream side, in this distributed power system, the power system is connected to the most upstream side of the power line and the power is connected to the most downstream side of the power line. The consumer device is connected. Then, from the upstream side to the downstream side of the power line, the photovoltaic power generation device, the charging / discharging device, and the power generation device are connected in the order of arrangement. Further, the operation of the power generation device is controlled under the condition that the power flow is not directed to the upstream side (that is, the power system side) from the power generation device (so-called reverse power flow is prohibited). That is, the power generation device is operated so as to cover the power consumption of the power consumption device connected to the downstream side of itself. In addition, the photovoltaic power generation device is connected to the upstream side of the power generation device, and the generated power can be reverse-flowed to the power system. As described above, in the system described in Patent Document 1, the generated power of the photovoltaic power generation device can be reversely flowed to the power system, and the power generation device is effectively operated to cover the power consumption of the power consumption device. It is configured to be possible.

Further, Patent Document 2 describes a system in which both a photovoltaic power generation device and a charging / discharging device are connected to one power conditioner. With such a configuration, the number of power conditioners can be reduced as compared with the case where the photovoltaic power generation device and the charge / discharge device are connected to separate power conditioners.

Japanese Unexamined Patent Publication No. 2011-188607 Japanese Unexamined Patent Publication No. 2014-23382

Even in a distributed power generation system as described in Patent Document 1, if the operation control of the fuel cell power generation unit is changed, not only the generated power of the photovoltaic power generation device is backflowed to the power system, but also the power generation of the fuel cell power generation unit is generated. It is possible to reverse power flow to the power system.

For example, the distributed power supply system shown in FIG. 1 includes a power line 2 connected to a power system 1, a photovoltaic power generation device 3, a fuel cell device 4, and a charging / discharging device 5. A connection point to the power system 1 is provided on the upstream side of the power line 2, and the first connection point 10 and the second connection point 11 are arranged on the power line 2 from the connection point to the power system 1 toward the downstream side. It is provided in. In addition, the distributed power supply system includes a power conditioner 7 to which the photovoltaic power generation device 3 and the charging / discharging device 5 are connected. The power conditioner 7 is connected to the first connection point 10, and the fuel cell device 4 is connected to the second connection point 11.

The power conditioner 7 can supply power to the first interconnection wiring 14 that is electrically connected to the power line 2, and to the first self-supporting wiring 15 that is not electrically connected to the power line 2. Can supply power. The first power consuming device 6 can receive power from the second connection point 11 of the power line 2. The second power consumption device 9 is connected to the switch 24 via the connection line 25. The switch 24 is connected to the power conditioner 7 via the first self-supporting wiring 15 and is connected to the second connection portion 11 of the power line 2 via the connection line 23. When power is supplied from the power conditioner 7 to the first self-supporting wiring 15, the switch 24 switches to a state in which the contact a and the contact c are connected, and the power conditioner 7 to the first self-supporting wire 15 is connected. When power is not supplied to the wiring 15 (that is, when power is supplied from the power conditioner 7 to the first interconnection wiring 14), the contact b and the contact c are connected. Switch. That is, the second power consuming device 9 is connected to the first connection form (a form in which the contact b and the contact c are connected by the switch 24) capable of receiving power supply from the power line 2 and the power conditioner 7. Power is supplied in any of the second connection forms (a form in which the contact a and the contact c are connected by the switch 24) in which the power can be supplied via the first self-supporting wiring 15. be able to.

FIG. 1 shows a case where power is normally supplied from the power system 1 to the power line 2. In this case, the power conditioner 7 supplies power to the first connection portion 10 of the power line 2 via the first interconnection wiring 14, and the fuel cell device 4 supplies the power line via the second interconnection wiring 16. Power is supplied to the second connection point 11 of 2. Further, power is supplied to the first power consuming device 6 from the second connection point 11 of the power line 2. Power is supplied to the second power consuming device 9 from the second connection portion 11 of the power line 2 via the connection line 23, the switch 24, and the connection line 25. The reverse power flow power P2 measured by the power meter 22 provided between the second connection point 11 and the first connection point 10 of the power line 2 can be regarded as the power that reverse power flows from the fuel cell device 4 to the power system 1. it can. Further, the electric power P1 measured by the electric power meter 8 provided on the electric power system 1 side of the first connection point 10 of the electric power line 2 is the electric power P7 that flows backward from the power conditioner 7 to the electric power system 1 and the fuel cell device 4. It can be regarded as the sum of the electric power P2 that flows backward from the electric power system 1 to the electric power system 1. In this case, the electric power P7 that flows backward from the power conditioner 7 to the electric power system 1 may include the electric power generated by the photovoltaic power generation device 3, but does not include the electric power generated by the fuel cell device 4.

FIG. 2 shows a case where the power supply from the power system 1 to the power line 2 is not normally performed. In this case, the power conditioner 7 supplies electric power to the first self-supporting wiring 15, and the electric power is supplied to the second power consuming device 9 via the switch 24 and the connection line 25. Further, the fuel cell device 4 supplies electric power to the power conditioner 7 via the second self-supporting wiring 17. That is, the power generated by the photovoltaic power generation device 3 and the power generated by the fuel cell device 4 can be supplied to the second power consuming device 9 via the power conditioner 7.

When the fuel cell device 4 is connected to the power line 2 via a circuit breaker 18 such as a branch breaker or an earth leakage breaker provided in the middle of the second interconnection wiring 16, the branch breaker is erroneously operated. Even if the power supply from the power system 1 to the power line 2 is normally performed, the circuit breaker 18 may be disconnected due to the operation of the earth leakage breaker or the like. In that case, as shown in the comparative example of FIG. 6, the fuel cell device 4 does not normally supply electric power from the electric power system 1 to the electric power line 2 (that is, electric power via the second interconnection wiring 16). It is determined that the interconnection with the system 1 is disconnected), and power is supplied to the power conditioner 7 via the second self-supporting wiring 17. On the other hand, the power conditioner 7 is not affected by the operation of such a circuit breaker 18, determines that the power supply from the power system 1 to the power line 2 is normally performed, and is used for the first interconnection. Power is continuously supplied to the first connection point 10 of the power line 2 via the wiring 14.

That is, in the case shown in FIG. 6, since both the power generated by the solar power generation device 3 and the power generated by the fuel cell device 4 are supplied to the power conditioner 7, they are supplied from the power conditioner 7 to the power line 2. When the power flows back into the power system 1, the backflow power may include both the power generated by the solar power generation device 3 and the power generated by the fuel cell device 4. In this case, since the reverse power flow power measured by the power meter 22 is zero, the reverse power flow power from the fuel cell device 4 is recognized as zero, but in reality, the reverse power flow power measured by the power meter 8 is zero. May also include the generated power of the fuel cell device 4.

As described above, in the conventional distributed power supply system, there is a problem that it may not be possible to accurately identify from which power generation device the power flowing back to the power system is the power supplied.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a distributed power supply system capable of accurately identifying from which power generation device the power flowing back to the power system is the power supplied. There is a point to do.

The characteristic configuration of the distributed power supply system according to the present invention for achieving the above object is a distributed power supply system including a power line connected to a power system, a first power generation device, and a second power generation device. ,
Connection points to the power system are provided on the upstream side of the power line, and first connection points and second connection points are provided on the power line in the order of arrangement from the connection points to the power system to the downstream side. Be,
A power conditioner to which the first power generation device is connected is provided.
The power conditioner can supply power to the first interconnection wiring that is electrically connected to the power line, and supplies power to the first self-supporting wiring that is not electrically connected to the power line. Can be supplied
The first power consuming device can receive power from the power line, and can receive power.
The second power consuming device has a first connection form capable of receiving power supply from the power line and a second connection capable of receiving power supply from the power conditioner via the first self-supporting wiring. Power can be supplied in any of the forms of connection,
The second power generation device can supply power to the second connection point of the power line via the second interconnection wiring, and can supply power to the power conditioner via the second self-supporting wiring.
The second power generation device is
In the second interconnection operation mode in which the output power is adjusted in the form of outputting the power to the second interconnection wiring when the interconnection with the power system via the second interconnection wiring is not interrupted. Work,
When the interconnection with the power system via the second interconnection wiring is disconnected, the operation operates in the second independent operation mode in which the output power is adjusted in the form of outputting the power to the second independent wiring. ,
The power conditioner is
When the power supply from the power system to the power line is not performed normally, the output power is adjusted so that the power is not output to the first interconnection wiring and is output to the first self-supporting wiring. Operates in the first self-sustaining operation mode,
When the power is normally supplied from the power system to the power line and the power is not supplied from the second power generation device to the second self-supporting wiring, the power is supplied to the first interconnection wiring. Operates in the first interconnection operation mode in which the output power is adjusted in a form that outputs to the first self-supporting wiring and does not output to the first self-supporting wiring.
When the power is normally supplied from the power system to the power line and the power is supplied from the second power generation device to the second self-supporting wiring, the power is supplied to the first interconnection wiring. The point is that it operates in the first special operation mode in which the output power is adjusted in the form of outputting to the first self-supporting wiring without outputting to.

According to the above characteristic configuration, the second power generation device is normally supplied with power from the power system to the power line when the connection with the power system via the wiring for the second interconnection is not interrupted. If so, it operates in the second interconnection operation mode in which the output power is adjusted in the form of outputting the electric power to the second interconnection wiring. As a result, for example, the reverse power flow power measured by a power meter provided between the second connection point and the first connection point of the power line can be regarded as the power that reverse power flows from the second power generation device to the power system. Further, the power conditioner supplies power to the first interconnection when the power is normally supplied from the power system to the power line and the power is not supplied from the second power generation device to the second self-supporting wiring. It operates in the first interconnection operation mode in which the output power is adjusted in a form that outputs to the wiring and does not output to the first self-supporting wiring. That is, the power supplied by the power conditioner to the power line does not include the power generated by the second power generation device. As a result, the power measured by the power meter provided on the power system side of the first connection point of the power line flows back to the power system via the power conditioner and from the second power generation device to the power system. Can be regarded as the sum of the power flowing in the opposite direction. Therefore, for example, by using a power meter provided on the power system side of the first connection point of the power line and a power meter provided between the second connection point and the first connection point of the power line, for example, the first. 1 It is possible to identify the electric power that flows backward from the power generation device to the electric power system via the power conditioner.

Even if the power is normally supplied from the power system to the power line, if the power is being supplied from the second power generation device to the second self-supporting wiring, the power conditioner may be subjected to the second power conditioner. Since both the power generated by the 1 power generation device and the power generated by the 2nd power generation device are supplied, when the power supplied from the power conditioner to the power line flows backward to the power system, the reverse power flow power is the first power generation device. It may include both the generated power of the second power generation device and the generated power of the second power generation device. In this case, since the reverse power flow power measured by the power meter provided between the second connection point and the first connection point of the power line is zero, the reverse power flow power from the second power generation device is recognized as zero. However, in reality, there is a possibility that the power generated by the fuel cell device is included in the reverse power flow measured by the power meter provided on the power system side of the first connection point of the power line.
However, in this feature configuration, the power conditioner supplies power when the power is normally supplied from the power system to the power line and the power is supplied from the second power generation device to the second self-supporting wiring. It operates in the first special operation mode in which the output power is adjusted in the form of not outputting to the first interconnection wiring and outputting to the first self-supporting wiring. That is, the reverse power flow from the power conditioner to the power system is not performed, that is, the reverse power flow from both the first power generation device and the second power generation device to the power system is not performed, so that the reverse power flow to the power system is not performed. It is prevented that the breakdown of the electric power generated is misunderstood.
Therefore, it is possible to provide a distributed power supply system capable of accurately identifying from which power generation device the power flowing back to the power system is the power supplied.

Another characteristic configuration of the distributed power supply system according to the present invention is a distributed power supply system including a power line connected to a power system, a first power generation device, and a second power generation device.
Connection points to the power system are provided on the upstream side of the power line, and first connection points and second connection points are provided on the power line in the order of arrangement from the connection points to the power system to the downstream side. Be,
A power conditioner to which the first power generation device is connected is provided.
The power conditioner can supply power to the first interconnection wiring that is electrically connected to the power line, and supplies power to the first self-supporting wiring that is not electrically connected to the power line. Can be supplied
The first power consuming device can receive power from the power line, and can receive power.
The second power consuming device has a first connection form capable of receiving power supply from the power line and a second connection capable of receiving power supply from the power conditioner via the first self-supporting wiring. Power can be supplied in any of the connection forms,
The second power generation device can supply power to the second connection point of the power line via the second interconnection wiring, and can supply power to the power conditioner via the second self-supporting wiring.
The second power generation device is
In the second interconnection operation mode in which the output power is adjusted in the form of outputting the power to the second interconnection wiring when the interconnection with the power system via the second interconnection wiring is not interrupted. Work,
When the interconnection with the power system via the second interconnection wiring is disconnected, the operation operates in the second independent operation mode in which the output power is adjusted in the form of outputting the power to the second independent wiring. ,
The power conditioner is
When the power supply from the power system to the power line is not performed normally, the output power is adjusted so that the power is not output to the first interconnection wiring and is output to the first self-supporting wiring. Operates in the first self-sustaining operation mode,
When the power is normally supplied from the power system to the power line and the power is not supplied from the second power generation device to the second self-supporting wiring, the power is supplied to the first interconnection wiring. Operates in the first interconnection operation mode in which the output power is adjusted in a form that outputs to the above and does not output to the first self-supporting wiring.
When the electric power is normally supplied from the electric power system to the electric power line and the electric power is supplied from the second power generation device to the second self-supporting wiring, the reverse power flow of the electric power to the electric power system is performed. The point is that it operates in the first special operation mode in which the output power is adjusted in a form in which the power is output to the first interconnection wiring and is not output to the first self-supporting wiring under the condition of prohibiting.

According to the above characteristic configuration, the second power generation device is normally supplied with power from the power system to the power line when the connection with the power system via the wiring for the second interconnection is not interrupted. If so, it operates in the second interconnection operation mode in which the output power is adjusted in the form of outputting the electric power to the second interconnection wiring. As a result, for example, the reverse power flow power measured by a power meter provided between the second connection point and the first connection point of the power line can be regarded as the power that reverse power flows from the second power generation device to the power system. Further, the power conditioner supplies power to the first interconnection when the power is normally supplied from the power system to the power line and the power is not supplied from the second power generation device to the second self-supporting wiring. It operates in the first interconnection operation mode in which the output power is adjusted in a form that outputs to the wiring and does not output to the first self-supporting wiring. That is, the power supplied by the power conditioner to the power line does not include the power generated by the second power generation device. As a result, the power measured by the power meter provided on the power system side of the first connection point of the power line flows back to the power system via the power conditioner and from the second power generation device to the power system. Can be regarded as the sum of the power flowing in the opposite direction. Therefore, for example, by using a power meter provided on the power system side of the first connection point of the power line and a power meter provided between the second connection point and the first connection point of the power line, for example, the first 1 It is possible to identify the electric power that flows backward from the power generation device to the electric power system via the power conditioner.

Even if the power is normally supplied from the power system to the power line, if the power is being supplied from the second power generation device to the second self-supporting wiring, the power conditioner may be subjected to the second power conditioner. Since both the power generated by the 1 power generation device and the power generated by the 2nd power generation device are supplied, when the power supplied from the power conditioner to the power line flows backward to the power system, the reverse power flow power is the first power generation device. It may include both the generated power of the second power generation device and the generated power of the second power generation device. In this case, since the reverse power flow power measured by the power meter provided between the second connection point and the first connection point of the power line is zero, the reverse power flow power from the second power generation device is recognized as zero. However, in reality, the reverse power flow measured by the power meter provided on the power system side of the first connection point of the power line may include the generated power of the fuel cell device.
However, in this feature configuration, the power conditioner is a power system when the power is normally supplied from the power system to the power line and the power is supplied from the second power generation device to the second self-supporting wiring. Operates in the first special operation mode in which the output power is adjusted so that the power is output to the first interconnection wiring and not to the first self-supporting wiring under the condition that the reverse power flow to the power is prohibited. .. That is, the reverse power flow from the power conditioner to the power system is not performed, that is, the reverse power flow from both the first power generation device and the second power generation device to the power system is not performed, so that the reverse power flow to the power system is not performed. It is prevented that the breakdown of the electric power generated is misunderstood.
Therefore, it is possible to provide a distributed power supply system capable of accurately identifying from which power generation device the power flowing back to the power system is the power supplied.

Yet another characteristic configuration of the distributed power supply system according to the present invention is a distributed power supply system including a power line connected to a power system, a first power generation device, and a second power generation device.
Connection points to the power system are provided on the upstream side of the power line, and first connection points and second connection points are provided on the power line in the order of arrangement from the connection points to the power system to the downstream side. Be,
A power conditioner to which the first power generation device is connected is provided.
The power conditioner can supply power to the first interconnection wiring that is electrically connected to the power line, and supplies power to the first self-supporting wiring that is not electrically connected to the power line. Can be supplied
The first power consuming device can receive power from the power line, and can receive power.
The second power consuming device has a first connection form capable of receiving power supply from the power line and a second connection capable of receiving power supply from the power conditioner via the first self-supporting wiring. Power can be supplied in any of the connection forms,
The second power generation device can supply power to the second connection point of the power line via the second interconnection wiring, and can supply power to the power conditioner via the second self-supporting wiring.
A circuit breaker capable of cutting off the connection between the second power generation device and the power conditioner is provided in the middle of the second self-supporting wiring.
The second power generation device is
In the second interconnection operation mode in which the output power is adjusted in the form of outputting the power to the second interconnection wiring when the interconnection with the power system via the second interconnection wiring is not interrupted. Work,
When the interconnection with the power system via the second interconnection wiring is interrupted, it operates in the second independent operation mode in which the output power is adjusted in the form of outputting the power to the second independent wiring. ,
The power conditioner is
When the power supply from the power system to the power line is not normally performed, the power is not output to the first interconnection wiring and the first self-supporting wiring is performed in a state where the circuit breaker is not shut off. Operates in the first self-sustaining operation mode that adjusts the output power in the form of outputting to
When the power is normally supplied from the power system to the power line and the power is not supplied from the second power generation device to the second self-supporting wiring, the power is supplied to the first interconnection wiring. Operates in the first interconnection operation mode in which the output power is adjusted in a form that outputs to the first self-supporting wiring and does not output to the first self-supporting wiring.
When the power supply from the power system to the power line is normally performed and the power is supplied from the second power generation device to the second self-supporting wiring, the state in which the breaker is cut off is activated. Therefore, it operates in the first special operation mode in which the output power is adjusted in a form in which the power is output to the first interconnection wiring and not to the first self-supporting wiring.

According to the above characteristic configuration, the second power generation device is normally supplied with power from the power system to the power line when the connection with the power system via the wiring for the second interconnection is not interrupted. If so, it operates in the second interconnection operation mode in which the output power is adjusted in the form of outputting the electric power to the second interconnection wiring. As a result, for example, the reverse power flow power measured by a power meter provided between the second connection point and the first connection point of the power line can be regarded as the power that reverse power flows from the second power generation device to the power system. Further, in the power conditioner, when the power is normally supplied from the power system to the power line and the power is not supplied from the second power generation device to the second self-supporting wiring, the power conditioner is used for the second self-supporting wiring. Power is output to the first interconnection wiring and the first self-supporting wiring is in a state where the breaker that is provided in the middle and can cut off the connection between the second power generation device and the power conditioner is not cut off. It operates in the first interconnection operation mode in which the output power is adjusted in the form of no output. That is, the power supplied by the power conditioner to the power line does not include the power generated by the second power generation device. As a result, the power measured by the power meter provided on the power system side of the first connection point of the power line flows back to the power system via the power conditioner and from the second power generation device to the power system. Can be regarded as the sum of the power flowing in the opposite direction. Therefore, for example, by using a power meter provided on the power system side of the first connection point of the power line and a power meter provided between the second connection point and the first connection point of the power line, for example, the first 1 It is possible to identify the electric power that flows backward from the power generation device to the electric power system via the power conditioner.

Even if the power is normally supplied from the power system to the power line, if the power is being supplied from the second power generation device to the second self-supporting wiring, the power conditioner may be subjected to the second power conditioner. Since both the power generated by the 1 power generation device and the power generated by the 2nd power generation device are supplied, when the power supplied from the power conditioner to the power line flows backward to the power system, the reverse power flow power is the first power generation device. It may include both the generated power of the second power generation device and the generated power of the second power generation device. In this case, since the reverse power flow power measured by the power meter provided between the second connection point and the first connection point of the power line is zero, the reverse power flow power from the second power generation device is recognized as zero. However, in reality, the reverse power flow measured by the power meter provided on the power system side of the first connection point of the power line may include the generated power of the fuel cell device.
However, in this feature configuration, the power conditioner is a breaker when the power is normally supplied from the power system to the power line and the power is supplied from the second power generation device to the second self-supporting wiring. Operates in the first special operation mode in which the output power is adjusted so as to output the power to the first interconnection wiring and not to the first self-supporting wiring in a state where the power is cut off. That is, when the circuit breaker is shut off, the power generated by the second power generation device is not supplied to the power conditioner. As a result, even if the reverse power flow from the power conditioner to the power system is performed, the reverse power flow does not include the power generated by the second power generation device, so that the breakdown of the power flowing back to the power system is misunderstood. Is prevented.
Therefore, it is possible to provide a distributed power supply system capable of accurately identifying from which power generation device the power flowing back to the power system is the power supplied.

Yet another characteristic configuration of the distributed power supply system according to the present invention is that it includes a charging / discharging device connected to the power conditioner.

According to the above-mentioned characteristic configuration, it is possible to charge the generated power of the first power generation device by using the charging / discharging device, discharge the power from the charging / discharging device to the power line, and the like.

Another characteristic configuration of the distributed power generation system according to the present invention is that the first power generation device is a photovoltaic power generation device and the second power generation device is a fuel cell device.

According to the above-mentioned feature configuration, it is possible to know the power flowing back from each of the photovoltaic power generation device and the fuel cell device to the power system.

It is a figure which shows the structure of the distributed power supply system of 1st Embodiment. It is a figure which shows the structure of the distributed power supply system of 1st Embodiment. It is a figure which shows the structure of the distributed power supply system of 1st Embodiment. It is a figure which shows the structure of the distributed power source system of 2nd Embodiment. It is a figure which shows the structure of the distributed power source system of 3rd Embodiment. It is a figure which shows the structure of the distributed power supply system of the comparative example.

<First Embodiment>
The distributed power supply system according to the first embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a distributed power supply system according to the first embodiment. As shown in the figure, the distributed power generation system includes a power line 2 connected to a power system 1, a photovoltaic power generation device 3 as a first power generation device, a fuel cell device 4 as a second power generation device, and charging / discharging. It includes a device 5. A connection point to the power system 1 is provided on the upstream side of the power line 2, and the first connection point 10 and the second connection point 11 are arranged on the power line 2 from the connection point to the power system 1 toward the downstream side. It is provided in. In addition, the distributed power supply system includes a power conditioner 7 to which the photovoltaic power generation device 3 and the charging / discharging device 5 are connected. The power conditioner 7 is connected to the first connection point 10, and the fuel cell device 4 is connected to the second connection point 11.
In the distributed power supply system of the present embodiment, reverse power flow of electric power to the electric power system 1 is allowed unless otherwise specified.

The power conditioner 7 is an operation of a power conditioner circuit unit 7a having an electric circuit such as a DC / DC conversion circuit or a DC / AC conversion circuit configured by using a semiconductor switching element, and the power conditioner circuit unit 7a thereof. A power conditioner control unit 7b for controlling the above is provided. The photovoltaic power generation device 3 is a device that receives sunlight and generates electricity, and is connected to the power conditioner circuit unit 7a. The charging / discharging device 5 is a device capable of discharging the electric power stored in the power storage unit and charging the electric power to the power storage unit, and is connected to the power conditioner circuit unit 7a.

The power conditioner 7 can supply power to the first interconnection wiring 14 that is electrically connected to the power line 2, and to the first self-supporting wiring 15 that is not electrically connected to the power line 2. Can supply power. The first power consuming device 6 can receive power from the second connection point 11 of the power line 2. The second power consumption device 9 is connected to the switch 24 via the connection line 25. The switch 24 is connected to the power conditioner 7 via the first self-supporting wiring 15 and is connected to the second connection portion 11 of the power line 2 via the connection line 23. When power is supplied from the power conditioner 7 to the first self-supporting wiring 15, the switch 24 switches to a state in which the contact a and the contact c are connected, and the power conditioner 7 to the first self-supporting device 24 When power is not supplied to the wiring 15 (that is, when power is supplied from the power conditioner 7 to the first interconnection wiring 14), the contact b and the contact c are connected. Switch. The connection state of each contact of the switch 24 may be switched by a command from the power conditioner 7, or may be automatically switched. In the latter case, for example, when the first self-supporting wiring 15 is energized, a relay (not shown) provided in the switch 24 automatically switches to a state in which the contact a and the contact c are connected, and the second 1 When the self-supporting wiring 15 is no longer energized, the relay provided in the switch 24 automatically switches to a state in which the contact b and the contact c are connected. Since the first self-supporting wiring 15 is not connected to the power line 2, the power supplied from the power conditioner 7 to the first self-supporting wiring 15 is not supplied to the power line 2.

As described above, the first power consuming device 6 can only receive power from the power line 2. Therefore, for example, if a power failure occurs in the power system 1 and the power supply to the power line 2 is stopped, the first power consuming device 6 cannot operate. On the other hand, the second power consuming device 9 can receive power supply via the switch 24 that switches the power supply source between the power line 2 and the power conditioner 7. Specifically, the second power consuming device 9 has a first connection form (a form in which the contact b and the contact c are connected by the switch 24) capable of receiving power supply from the power line 2, and a power conditioner. Power can be supplied in any of the second connection forms (a form in which the contact a and the contact c are connected by the switch 24) in which power can be supplied from the na 7 via the first self-supporting wiring 15. Can be supplied. Therefore, the second power consuming device 9 can always receive the power supply regardless of whether or not the power supply from the power system 1 to the power line 2 is normally performed. Therefore, an electric device that may stop the power supply when a power failure occurs in the power system 1 is provided at the position of the first power consuming device 6, regardless of whether or not a power failure occurs in the power system 1. Instead, it is preferable to provide an electric device for which power is always supplied at the position of the second power consuming device 9.

The power conditioner 7 operates to output the generated power of the photovoltaic power generation device 3 to the first connection point 10 of the power line 2 via the first interconnection wiring 14 or the second power through the first self-supporting wiring 15. The operation of outputting to the consumption device 9 and the operation of charging / discharging the charging / discharging device 5 are controlled. Specifically, the power conditioner 7 controls the generated power of the photovoltaic power generation device 3 by, for example, maximum power tracking control, and uses the generated power as the first connection point 10 or the second power consumption device 9 of the power line 2. Can be supplied to. In addition, the power conditioner 7 may charge the charging / discharging device 5 with a part or all of the generated power of the photovoltaic power generation device 3. Further, the power conditioner 7 can also charge the charging / discharging device 5 with the electric power received from the first connection portion 10 of the power line 2.

The measurement results of the instrument transformer 12 and the instrument transformer 13 provided on the upstream side of the first connection point 10 of the power line 2 are transmitted to the power conditioner 7. For example, the power conditioner 7 is located upstream from the first connection point 10 of the power line 2 based on the product of the current value transmitted from the current transformer 12 for the instrument and the voltage value transmitted from the transformer 13 for the instrument. The reverse power flow power P1 toward the power system 1 can be derived. Further, the power conditioner 7 can determine whether or not the power supply from the power system 1 is normally performed based on the voltage value transmitted from the voltage transformer 13. For example, if the voltage value transmitted from the voltage transformer 13 is equal to or higher than a predetermined value, the power conditioner 7 determines that the power supply from the power system 1 is normally performed, and the voltage transformer 13 determines that the power supply is normally performed. If the voltage value transmitted from is less than a predetermined value, it can be determined that the power supply from the power system 1 is not normally performed. Then, the power line 2 is separated from the power system 1 by a circuit breaker (not shown) or the like.

The fuel cell device 4 uses, for example, a fuel cell 4d such as a solid oxide fuel cell (SOFC) or a solid polymer fuel cell (PEFC), and the electric power generated by the fuel cell 4d to obtain electric power having a desired voltage, frequency, and phase. It is provided with a fuel cell unit 4b having a power conversion unit 4c for converting to and outputting to the second connection portion 11 of the power line 2. Further, the fuel cell device 4 includes a fuel cell control unit 4a and the like that control the operation of the fuel cell unit 4b. The fuel cell device 4 may include a fuel reformer or the like that generates hydrogen or the like as a fuel gas to be supplied to the fuel cell 4d by a reforming process.

The fuel cell device 4 is connected to the power line 2 via a circuit breaker 18 such as a branch breaker or an earth leakage breaker provided in the middle of the second interconnection wiring 16.

The fuel cell device 4 operates at, for example, a rated output. In that case, if the power supplied from the fuel cell device 4 to the second connection portion 11 of the power line 2 is larger than the sum of the power consumption of the first power consuming device 6 and the power consumption of the second power consuming device 9, the power is that. Surplus power is supplied from the second connection point 11 toward the first connection point 10. On the other hand, if the power supplied from the fuel cell device 4 to the second connection portion 11 of the power line 2 is smaller than the sum of the power consumption of the first power consumption device 6 and the power consumption of the second power consumption device 9. The insufficient power is supplied from the first connection point 10 toward the second connection point 11.

The fuel cell device 4 determines whether or not the interconnection with the electric power system 1 via the second interconnection wiring 16 is broken. Then, the fuel cell device 4 adjusts the output power in a form of outputting the electric power to the second interconnection wiring 16 when the interconnection with the electric power system 1 via the second interconnection wiring 16 is not interrupted. When the operation is performed in the second interconnection operation mode and the interconnection with the power system 1 via the second interconnection wiring 16 is interrupted, the output power is output in the form of outputting the power to the second self-sustaining wiring 17. Operates in the second self-sustaining operation mode.

Assuming that the interconnection with the electric power system 1 via the second interconnection wiring 16 is interrupted, the circuit breaker 18, which will be described later, is cut off, so that the fuel via the second interconnection wiring 16 is cut off. The case where the interconnection between the battery device 4 and the power system 1 is interrupted at the portion of the wiring 16 for the second interconnection is included. In addition, assuming that the interconnection with the power system 1 via the second interconnection wiring 16 is interrupted, the fuel cell device 4 is connected to the second interconnection wiring because the circuit breaker 18 is not shutting off. Although it is electrically connected to the power line 2 via 16, the power line 2 is disconnected from the power system 1 due to a power failure or the like in the power system 1, and the power supply from the power system 1 to the power line 2 is supplied. This includes cases where it is not performed normally.

Specifically, is the fuel cell device 4 disconnected from the power system 1 via the second interconnection wiring 16 by measuring the voltage of the second interconnection wiring 16 or the like? Whether or not it can be determined. For example, when the voltage of the second interconnection wiring 16 drops due to a power failure in the power system 1, the fuel cell device 4 is disconnected from the power system 1 via the second interconnection wiring 16. Judge that it is. In addition, since the fuel cell device 4 is connected to the power line 2 via a circuit breaker 18 such as a branch breaker or an earth leakage breaker provided in the middle of the second interconnection wiring 16, the branch breaker is erroneously used. Even if the power is normally supplied from the power system 1 to the power line 2, the circuit breaker 18 may be disconnected due to the operation of the circuit breaker or the operation of the earth leakage breaker. In that case, the fuel cell device 4 determines that the fuel cell device 4 is disconnected from the power system 1 via the second interconnection wiring 16.

As described above, the fuel cell device 4 operates in the second interconnection operation mode when the interconnection with the power system 1 via the second interconnection wiring 16 is not interrupted, and the second interconnection The operation is performed in the second self-sustaining operation mode so that the connection with the power system 1 via the system wiring 16 is disconnected. Then, the fuel cell device 4 can supply electric power to the second connection portion 11 of the power line 2 via the second interconnection wiring 16 and can supply electric power to the power conditioner 7 via the second self-supporting wiring 17. ..

In FIG. 1, the reverse power flow from the first connection point 10 of the power line 2 to the power system 1 on the upstream side is shown by P1, and the power conditioner 7 is the first connection of the power line 2 via the first interconnection wiring 14. The power supplied to the location 10 is indicated by P7, the generated power of the solar power generation device 3 is indicated by P3, the charging power of the charging / discharging device 5 is indicated by P5, and the fuel cell device 4 is indicated by the second interconnection wiring 16. The power supplied to the second connection point 11 of the power line 2 (power generated by the fuel cell device 4) is indicated by P4, the power consumption of the first power consumption device 6 is indicated by P6, and the power consumption of the second power consumption device 9 is shown. Is indicated by P9, and the electric power (surplus electric power among the generated electric power of the fuel electric device) from the second connection portion 11 of the power line 2 to the first connection portion 10 is indicated by P2.

FIG. 1 shows a state in which the power conditioner 7 is operating in the first interconnection operation mode and the fuel cell device 4 is operating in the second interconnection operation mode. In this case, the power conditioner 7 supplies power to the first connection portion 10 of the power line 2 via the first interconnection wiring 14, and the fuel cell device 4 supplies the power line via the second interconnection wiring 16. Power is supplied to the second connection point 11 of 2. No power is supplied from the power conditioner 7 to the first self-supporting wiring 15, and the switch 24 switches to a state in which the contact b and the contact c are connected. The power measured by the power meter 22 provided between the second connection point 11 and the first connection point 10 of the power line 2 can be regarded as the power flowing back from the fuel cell device 4 to the power system 1. Further, the electric power P1 measured by the electric power meter 8 provided on the electric power system 1 side of the first connection point 10 of the electric power line 2 flows backward from the solar power generation device 3 to the electric power system 1 via the power conditioner 7. The sum of the electric power P7 to be generated and the electric power P2 flowing back from the fuel cell device 4 to the electric power system 1 is shown. That is, it is possible to distinguish between the power that flows backward from the photovoltaic power generation device 3 to the power system 1 and the power that flows backward from the fuel cell device 4 to the power system 1.

FIG. 2 shows a state in which the power conditioner 7 is operating in the first self-sustaining operation mode and the fuel cell device 4 is operating in the second self-sustaining operation mode. In this case, power is supplied from the power conditioner 7 to the first self-supporting wiring 15, and the switch 24 switches to a state in which the contact a and the contact c are connected. The power conditioner 7 supplies power to the second power consuming device 9 which is not connected to the power line 2 via the first self-supporting wiring 15, and the fuel cell device 4 passes through the second self-supporting wiring 17. Power is supplied to the power conditioner 7. That is, the power generated by the photovoltaic power generation device 3 and the power generated by the fuel cell device 4 can be supplied to the second power consuming device 9 via the power conditioner 7.

In FIG. 2, the power supplied by the power conditioner 7 to the second power consuming device 9 via the first self-supporting wiring 15 is shown by P7, the generated power of the solar power generation device 3 is shown by P3, and the charging / discharging device 5 is shown. The charging power of the fuel cell device 4 is indicated by P5, and the electric power supplied by the fuel cell device 4 to the power conditioner 7 via the second self-supporting wiring 17 (power generated by the fuel cell device 4) is indicated by P4.

When the fuel cell device 4 is connected to the power line 2 via a circuit breaker 18 such as a branch breaker or an earth leakage breaker provided in the middle of the second interconnection wiring 16, the branch breaker is erroneously operated. Even if the power supply from the power system 1 to the power line 2 is normally performed, the circuit breaker 18 may be disconnected due to the operation of the earth leakage breaker or the like. In that case, the fuel cell device 4 determines that the interconnection with the power system 1 via the second interconnection wiring 16 is disconnected, and connects the power conditioner 7 to the power conditioner 7 via the second self-sustaining wiring 17. Supply power. On the other hand, the power conditioner 7 is not affected by the operation of such a circuit breaker 18, determines that the power supply from the power system 1 to the power line 2 is normally performed, and is used for the first interconnection. Power is continuously supplied to the first connection point 10 of the power line 2 via the wiring 14. As a result, even if the power supply from the power system 1 to the power line 2 is normally performed, if the power is supplied from the fuel cell device 4 to the second self-supporting wiring 17, the power conditioner is used. Since both the power generated by the solar power generation device 3 and the power generated by the fuel cell device 4 are supplied to No. 7, when the power supplied from the power conditioner 7 to the power line 2 flows backward to the power system 1, the power is generated. The reverse power flow power may include both the power generated by the solar power generation device 3 and the power generated by the fuel cell device 4.

In this case, since the reverse power flow power measured by the power meter 22 provided between the second connection point 11 and the first connection point 10 of the power line 2 is zero, the reverse power flow power from the fuel cell device 4 is zero. However, in reality, the reverse power flow measured by the power meter 8 provided on the power system 1 side of the first connection point 10 of the power line 2 may include the power generated by the fuel cell device 4. There is.

However, in the present embodiment, as shown in FIG. 3, in the power conditioner 7, the power is normally supplied from the power system 1 to the power line 2, and the power battery device 4 is connected to the second self-supporting wiring 17. When the power is supplied, it operates in the first special operation mode in which the output power is adjusted in a form in which the power is not output to the first interconnection wiring 14 and is output to the first self-supporting wiring 15. In addition, the power conditioner 7 indicates that power is being supplied from the fuel cell device 4 to the second self-supporting wiring 17, and the voltage of the voltage transformer 19 or the like provided in the middle of the second self-supporting wiring 17. It can be known using a sensor.

That is, since the first self-supporting wiring 15 is not connected to the power line 2, the reverse power flow from the power conditioner 7 to the power system 1 is not performed in the first special operation mode, that is, the solar power generation device 3 Since the reverse power flow from both the fuel cell device 4 and the fuel cell device 4 to the power system 1 is not performed, it is possible to prevent the breakdown of the power flowing back to the power system 1 from being misidentified. Therefore, the distributed power supply system can accurately identify from which power generation device the power flowing back to the power system 1 is the power supplied. In addition, when the power conditioner 7 is operating in the first special operation mode, information to that effect may be output from an information display device such as a remote controller so that the user can recognize it.

<Second Embodiment>
The distributed power supply system of the second embodiment is different from the above-described embodiment in the content of the control performed by the power conditioner 7 in the first special operation mode. The distributed power supply system of the second embodiment will be described below, but the description of the same configuration as that of the above embodiment will be omitted.

In this embodiment as well, as shown in FIG. 2, the power conditioner 7 transfers the electric power to the first interconnection wiring 14 when the electric power is not normally supplied from the electric power system 1 to the electric power line 2. Operates in the first self-sustaining operation mode in which the output power is adjusted in the form of not outputting and outputting to the first self-supporting wiring 15.

Further, as shown in FIG. 1, in the power conditioner 7, the power supply from the power system 1 to the power line 2 is normally performed, and the power from the fuel cell device 4 to the second self-supporting wiring 17 is supplied. When the power is not supplied, it operates in the first interconnection operation mode in which the output power is adjusted so that the power is output to the first interconnection wiring 14 and not output to the first self-supporting wiring 15. In this case, reverse power flow from the power conditioner 7 to the power system 1 is allowed.

FIG. 4 is a diagram showing the configuration of the distributed power supply system of the second embodiment. In the present embodiment, the power conditioner 7 is in the case where the power is normally supplied from the power system 1 to the power line 2 and the power is supplied from the fuel cell device 4 to the second self-supporting wiring 17. The first method of adjusting the output power in such a manner that the power is output to the first interconnection wiring 14 and not output to the first self-supporting wiring 15 under the condition that the reverse power flow of the power to the power system 1 is prohibited. Operates in special operation mode.

Specifically, the power conditioner 7 refers to the measurement results of the current transformer 12 for the instrument and the transformer 13 for the instrument, and refers to the electric power from the first connection point 10 of the power line 2 to the power system 1, that is, It is possible to know the reverse power flow to the power system 1. Then, the power conditioner 7 indicates that the power is being supplied from the fuel cell device 4 to the second self-supporting wiring 17, and the voltage of the voltage transformer 19 provided in the middle of the second self-supporting wiring 17 or the like. It can be known using a sensor.

As described above, when the power conditioner 7 is normally supplying power from the power system 1 to the power line 2 and is supplying power from the fuel cell device 4 to the second self-supporting wiring 17. The first special that adjusts the output power in a form that outputs the power to the first interconnection wiring 14 and not to the first self-supporting wiring 15 under the condition that the reverse power flow of the power to the power system 1 is prohibited. Operates in operation mode. That is, the reverse power flow from the power conditioner 7 to the power system 1 is not performed, that is, the reverse power flow from both the solar power generation device 3 and the fuel cell device 4 to the power system 1 is not performed. It is prevented that the breakdown of the power flowing back to the system 1 is misidentified. In addition, when the power conditioner 7 is operating in the first special operation mode, information to that effect may be output from an information display device such as a remote controller so that the user can recognize it.

<Third Embodiment>
The distributed power supply system of the third embodiment is different from the above-described embodiment in the content of the control performed by the power conditioner 7 in the first special operation mode. The distributed power supply system of the third embodiment will be described below, but the description of the same configuration as that of the above embodiment will be omitted.

In this embodiment as well, as shown in FIG. 2, the power conditioner 7 transfers the electric power to the first interconnection wiring 14 when the electric power is not normally supplied from the electric power system 1 to the electric power line 2. Operates in the first self-sustaining operation mode in which the output power is adjusted in the form of not outputting and outputting to the first self-supporting wiring 15.

Further, as shown in FIG. 1, in the power conditioner 7, the power supply from the power system 1 to the power line 2 is normally performed, and the power from the fuel cell device 4 to the second self-supporting wiring 17 is supplied. When the power is not supplied, it operates in the first interconnection operation mode in which the output power is adjusted so that the power is output to the first interconnection wiring 14 and not output to the first self-supporting wiring 15. In this case, reverse power flow from the power conditioner 7 to the power system 1 is allowed.

FIG. 5 is a diagram showing a configuration of a distributed power supply system according to a third embodiment. A circuit breaker 20 capable of cutting off the connection between the fuel cell device 4 and the power conditioner 7 is provided in the middle of the second self-supporting wiring 17. Then, in the present embodiment, the power conditioner 7 normally supplies power from the power system 1 to the power line 2, and supplies power from the fuel cell device 4 to the second self-supporting wiring 17. If so, the power is output to the first interconnection wiring 14 and not to the first self-supporting wiring 15 in a state where the breaker 20 provided in the middle of the second self-supporting wiring 17 is cut off. Operates in the first special operation mode in which the output power is adjusted by. In addition, the power conditioner 7 indicates that power is being supplied from the fuel cell device 4 to the second self-supporting wiring 17, and the voltage of the voltage transformer 19 or the like provided in the middle of the second self-supporting wiring 17. It can be known using a sensor.

In this case, the fuel cell device 4 cannot supply electric power to the power conditioner 7, but it may perform an idling operation or the like in which electric power is consumed by its own auxiliary equipment or the like.

As described above, when the power conditioner 7 is normally supplying power from the power system 1 to the power line 2 and is supplying power from the fuel cell device 4 to the second self-supporting wiring 17. With the circuit breaker 20 cut off, the operation is performed in the first special operation mode in which the output power is adjusted so that the power is output to the first interconnection wiring 14 and not to the first self-supporting wiring 15. In this case, reverse power flow from the power conditioner 7 to the power system 1 is allowed. That is, when the circuit breaker 20 is shut off, the power generated by the fuel cell device 4 is not supplied to the power conditioner 7. As a result, even if the reverse power flow of power from the power conditioner 7 to the power system 1 is performed, the power generated by the fuel cell device 4 is not included in the reverse power flow, so that the breakdown of the power flowed back to the power system 1 Is prevented from being misidentified. In addition, when the power conditioner 7 is operating in the first special operation mode, information to that effect may be output from an information display device such as a remote controller so that the user can recognize it.

<Another Embodiment>
<1>
In the above embodiment, the configuration of the distributed power supply system of the present invention has been described with specific examples, but the configuration can be changed as appropriate.
For example, in the above embodiment, the second power consuming device 9 is constantly supplied with power both when the power supply from the power system 1 to the power line 2 is normally performed and when the power is not normally supplied. Although the switch 24 provided separately from the power conditioner 7 is used for the purpose of the above, the purpose can be achieved by other device configurations. For example, the power conditioner 7 may have a function similar to that of the switch 24.

<2>
In the above embodiment, the photovoltaic power generation device 3 is mentioned as an example of the first power generation device of the present invention, and the fuel cell device 4 is mentioned as an example of the second power generation device, but various power generation devices may be used for them. it can. For example, a type of power generation device including an engine and a generator driven by the engine can be used.

<3>
The configurations disclosed in the above embodiment (including other embodiments, the same shall apply hereinafter) can be applied in combination with the configurations disclosed in other embodiments as long as there is no contradiction, and are disclosed in the present specification. The embodiment is an example, and the embodiment of the present invention is not limited to this, and can be appropriately modified without departing from the object of the present invention.

The present invention can be used in a distributed power system that can accurately identify from which power generation device the power that flows backward into the power system is the power supplied.

1 Power system 2 Power line 3 Solar power generation device (1st power generation device)
4 Fuel cell device (second power generation device)
5 Charging / discharging device 6 1st power consuming device 7 Power conditioner 9 2nd power consuming device 10 1st connection point 11 2nd connection point 14 1st interconnection wiring 15 1st self-supporting wiring 16 2nd interconnection wiring 17 Second self-supporting wiring

Claims (5)

A distributed power system including a power line connected to an electric power system, a first power generation device, and a second power generation device.
Connection points to the power system are provided on the upstream side of the power line, and first connection points and second connection points are provided on the power line in the order of arrangement from the connection points to the power system to the downstream side. Be,
A power conditioner to which the first power generation device is connected is provided.
The power conditioner can supply power to the first interconnection wiring that is electrically connected to the power line, and supplies power to the first self-supporting wiring that is not electrically connected to the power line. Can be supplied
The first power consuming device can receive power from the power line, and can receive power.
The second power consuming device has a first connection form capable of receiving power supply from the power line and a second connection capable of receiving power supply from the power conditioner via the first self-supporting wiring. Power can be supplied in any of the connection forms,
The second power generation device can supply power to the second connection point of the power line via the second interconnection wiring, and can supply power to the power conditioner via the second self-supporting wiring.
The second power generation device is
In the second interconnection operation mode in which the output power is adjusted in the form of outputting the power to the second interconnection wiring when the interconnection with the power system via the second interconnection wiring is not interrupted. Work,
When the interconnection with the power system via the second interconnection wiring is disconnected, the operation operates in the second independent operation mode in which the output power is adjusted in the form of outputting the power to the second independent wiring. ,
The power conditioner is
When the power supply from the power system to the power line is not performed normally, the output power is adjusted so that the power is not output to the first interconnection wiring and is output to the first self-supporting wiring. Operates in the first self-sustaining operation mode,
When the power is normally supplied from the power system to the power line and the power is not supplied from the second power generation device to the second self-supporting wiring, the power is supplied to the first interconnection wiring. Operates in the first interconnection operation mode in which the output power is adjusted in a form that outputs to the first self-supporting wiring and does not output to the first self-supporting wiring.
When the power is normally supplied from the power system to the power line and the power is supplied from the second power generation device to the second self-supporting wiring, the power is supplied to the first interconnection wiring. A distributed power supply system that operates in the first special operation mode in which the output power is adjusted in the form of outputting to the first self-supporting wiring without outputting to. A distributed power system including a power line connected to an electric power system, a first power generation device, and a second power generation device.
Connection points to the power system are provided on the upstream side of the power line, and first connection points and second connection points are provided on the power line in the order of arrangement from the connection points to the power system to the downstream side. Be,
A power conditioner to which the first power generation device is connected is provided.
The power conditioner can supply power to the first interconnection wiring that is electrically connected to the power line, and supplies power to the first self-supporting wiring that is not electrically connected to the power line. Can be supplied
The first power consuming device can receive power from the power line, and can receive power.
The second power consuming device has a first connection form capable of receiving power supply from the power line and a second connection capable of receiving power supply from the power conditioner via the first self-supporting wiring. Power can be supplied in any of the connection forms,
The second power generation device can supply power to the second connection point of the power line via the second interconnection wiring, and can supply power to the power conditioner via the second self-supporting wiring.
The second power generation device is
In the second interconnection operation mode in which the output power is adjusted in the form of outputting the power to the second interconnection wiring when the interconnection with the power system via the second interconnection wiring is not interrupted. Work,
When the interconnection with the power system via the second interconnection wiring is disconnected, the operation operates in the second independent operation mode in which the output power is adjusted in the form of outputting the power to the second independent wiring. ,
The power conditioner is
When the power supply from the power system to the power line is not performed normally, the output power is adjusted so that the power is not output to the first interconnection wiring and is output to the first self-supporting wiring. Operates in the first self-sustaining operation mode,
When the power is normally supplied from the power system to the power line and the power is not supplied from the second power generation device to the second self-supporting wiring, the power is supplied to the first interconnection wiring. Operates in the first interconnection operation mode in which the output power is adjusted in a form that outputs to the above and does not output to the first self-supporting wiring.
When the electric power is normally supplied from the electric power system to the electric power line and the electric power is supplied from the second power generation device to the second self-supporting wiring, the reverse power flow of the electric power to the electric power system is performed. A distributed power supply system that operates in the first special operation mode in which the power is output to the first interconnection wiring and the output power is adjusted so as not to be output to the first self-supporting wiring under the condition of prohibiting. .. A distributed power system including a power line connected to an electric power system, a first power generation device, and a second power generation device.
Connection points to the power system are provided on the upstream side of the power line, and first connection points and second connection points are provided on the power line in the order of arrangement from the connection points to the power system to the downstream side. Be,
A power conditioner to which the first power generation device is connected is provided.
The power conditioner can supply power to the first interconnection wiring that is electrically connected to the power line, and supplies power to the first self-supporting wiring that is not electrically connected to the power line. Can be supplied
The first power consuming device can receive power from the power line, and can receive power.
The second power consuming device has a first connection form capable of receiving power supply from the power line and a second connection capable of receiving power supply from the power conditioner via the first self-supporting wiring. Power can be supplied in any of the connection forms,
The second power generation device can supply power to the second connection point of the power line via the second interconnection wiring, and can supply power to the power conditioner via the second self-supporting wiring.
A circuit breaker capable of cutting off the connection between the second power generation device and the power conditioner is provided in the middle of the second self-supporting wiring.
The second power generation device
In the second interconnection operation mode in which the output power is adjusted in the form of outputting the power to the second interconnection wiring when the interconnection with the power system via the second interconnection wiring is not interrupted. Work,
When the interconnection with the power system via the second interconnection wiring is disconnected, the operation operates in the second independent operation mode in which the output power is adjusted in the form of outputting the power to the second independent wiring. ,
The power conditioner is
When the power supply from the power system to the power line is not normally performed, the power is not output to the first interconnection wiring and the first self-supporting wiring is performed in a state where the circuit breaker is not shut off. Operates in the first self-sustaining operation mode that adjusts the output power in the form of outputting to
When the power is normally supplied from the power system to the power line and the power is not supplied from the second power generation device to the second self-supporting wiring, the power is supplied to the first interconnection wiring. Operates in the first interconnection operation mode in which the output power is adjusted in a form that outputs to the first self-supporting wiring and does not output to the first self-supporting wiring.
When the power supply from the power system to the power line is normally performed and the power is supplied from the second power generation device to the second self-supporting wiring, the state in which the breaker is cut off is operated. A distributed power supply system that operates in a first special operation mode in which power is output to the first interconnection wiring and the output power is adjusted so as not to be output to the first self-supporting wiring. The distributed power supply system according to any one of claims 1 to 3, further comprising a charging / discharging device connected to the power conditioner. The distributed power supply system according to any one of claims 1 to 4, wherein the first power generation device is a photovoltaic power generation device, and the second power generation device is a fuel cell device.

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