JP6873005B2 - Distributed power system - Google Patents

Description

The present invention relates to a distributed power supply 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 different from the photovoltaic 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. Further, 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 reverse-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 so that it can be used.

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

In the system described in Patent Document 1, for example, when the power consumption of the power consuming device is smaller than the maximum provided power of the power generation device, the power generation device has a surplus power generation capacity. However, since the charging / discharging device is connected to the upstream side of the power generation device like the solar power generation device, even if the power generation device has a surplus power generation capacity, the surplus power generation capacity is supplied to the charging / discharging device on the upstream side. You can't.

In particular, in order to reduce the number of power conditioners, when both a photovoltaic power generation device and a charging / discharging device are connected to one power conditioner as in the system described in Patent Document 2, the photovoltaic power generation device In order to reverse the power generated by the power conditioner, the power conditioner must be connected to the upstream side of the power generation device. Then, as described above, even if the power generation device has a surplus power generation capacity, the surplus power generation capacity cannot be supplied to the charging / discharging device connected to the power conditioner on the upstream side.

On the other hand, when the power conditioner is connected to the downstream side of the power generation device, if the power generation device has surplus power generation capacity, the surplus power generation capacity is supplied to the charging / discharging device connected to the power conditioner on the downstream side. Can be done. However, when the power conditioner is connected to the downstream side of the power generation device, the condition that the power flow is not directed from the power generation device to the upstream side (that is, the power system side) (so-called reverse power flow is prohibited). ), The generated power of the photovoltaic power generation device connected to the power conditioner cannot be reverse-fed.

The present invention has been made in view of the above problems, and an object of the present invention is to distribute a charge / discharge device and a solar power generation device connected to one power conditioner in combination with a power generation device. The point is to provide a type power supply system.

The characteristic configuration of the distributed power supply system according to the present invention for achieving the above object is different from the power line connected to the power system, the photovoltaic power generation device, the charging / discharging device, and the photovoltaic power generation device. A distributed power system equipped with a power generator
A connection point to the power system is provided on the upstream side of the power line, and a first connection point, a second connection point, and a third connection point are formed on the power line from the connection point to the power system to the downstream side. It is provided in that order,
A power conditioner to which the photovoltaic power generation device and the charging / discharging device are connected,
A first state in which the power conditioner is electrically connected to the first connection point of the power line, and a second state in which the power conditioner is electrically connected to the third connection point of the power line. A switch that switches to either
Equipped with a control device
The power generation device is electrically connected to the second connection point of the power line, and a predetermined minimum provision is provided so that the power from the upstream side to the second connection point of the power line becomes a predetermined reference power. Control the power provided to the power line within the range between the power and the maximum power provided,
The power consuming device is electrically connected to the third connection point of the power line.
The control device is
When the generated power of the photovoltaic power generation device is larger than the set generated power, the switch is switched to the first state, and the power conditioner outputs the generated power of the photovoltaic power generation device to the switch side. Execute the first operation mode to operate
When the generated power of the photovoltaic power generation device is equal to or less than the set generated power, the second operation mode in which the switch is switched to the first state and the charge / discharge device is discharged by the power conditioner, or the said. The point is to switch the switch to the second state and execute the third operation mode in which the charging / discharging device is charged and operated by the power conditioner.

According to the above-mentioned characteristic configuration, the power generation device is a power line within a range between a predetermined minimum provided power and a predetermined maximum provided power so that the power from the upstream side to the second connection point in the power line becomes a predetermined reference power. Control the power provided to. That is, while ensuring that the power provided by the power generation device does not go upstream from the second connection point (that is, the power provided by the power generation device does not reverse power flow to the power system), it is downstream from the second connection point. Power can be supplied to the third connection point of.

In addition, the control device switches the switch to the first state when the first operation mode is executed under the condition that the generated power of the photovoltaic power generation device is larger than the set generated power, and the photovoltaic power generation device is operated by the power conditioner. Operate to output the generated power of. That is, since the photovoltaic power generation device is electrically connected to the first connection point via the power conditioner, the generated power of the photovoltaic power generation device is directed to the upstream side from the first connection point to the power system. It can be used to reverse power flow to the power or to move from the first connection point to the second connection point and consume it in a power consuming device or the like.

Further, when the control device executes the second operation mode in a situation where the generated power of the photovoltaic power generation device is equal to or less than the set generated power, the control device switches the switch to the first state, and the charge / discharge device is operated by the power conditioner. Operate the discharge. That is, since the charge / discharge device is electrically connected to the first connection point via the power conditioner, the discharge power of the charge / discharge device is directed from the first connection point to the second connection point to generate electric power. It can be used for consumption in consumer devices. At this time, since the discharge power of the charge / discharge device is supplied to the first connection point on the upstream side of the second connection point, it is necessary to limit the power provided by the power generation device according to the magnitude of the discharge power of the charge / discharge device. Absent.

Furthermore, when the control device executes the third operation mode under the condition that the generated power of the photovoltaic power generation device is equal to or less than the set generated power, the control device switches the switch to the second state and charges / discharges the device by the power conditioner. To charge and operate. That is, since the charging / discharging device is electrically connected to the third connection point via the power conditioner, the charging / discharging device is supplied with the power provided by the power generation device (for example, surplus power) supplied to the second connection point. Can be used to charge.
Therefore, it is possible to provide a distributed power supply system that can utilize the charging / discharging device and the solar power generation device connected to one power conditioner in combination with the power generation device.

Another characteristic configuration of the distributed power supply system according to the present invention is that when the power generated by the photovoltaic power generation device is equal to or less than the set power generation power of the control device.
The second operation mode in which the switch is switched to the first state and the charging / discharging device is discharged by the power conditioner so that the received power supplied from the power system to the power line becomes the target received power. Or,
The switch is switched to the second state, and the charging / discharging device is charged and operated by the power conditioner so that the power provided from the power generation device to the second connection portion of the power line becomes the maximum provided power. The point is to execute the third operation mode.

According to the above characteristic configuration, when the control device executes the second operation mode in a situation where the generated power of the photovoltaic power generation device is equal to or less than the set generated power, the control device switches the switch to the first state and starts from the power system. The charge / discharge device is discharged and operated by the power conditioner so that the received power supplied to the power line becomes the target received power. That is, the discharge power of the charging / discharging device can be utilized in order to set the received power supplied from the power system to the power line to a desired value (target received power).

Further, when the control device executes the third operation mode in a situation where the generated power of the solar power generation device is equal to or less than the set generated power, the control device switches the switch to the second state and connects the power generation device to the second power line. The charge / discharge device is charged and operated by the power conditioner so that the power provided to the location becomes the maximum power provided. That is, the charging power of the charging / discharging device can be utilized in order to operate the power generation device in a state of outputting the maximum provided power.

Yet another characteristic configuration of the distributed power supply system according to the present invention is that when the control device is executing the second operation mode, the power provided from the power generation device to the second connection point of the power line is supplied. If it is not the maximum power provided, the point is to switch to the third operation mode.

When the second operation mode is executed, the power conditioner adjusts the discharge power of the charging / discharging device while being electrically connected to the first connection point on the upstream side of the second connection point. .. Further, the power generation device provides the power provided to the power line within the range between the predetermined minimum provided power and the maximum provided power so that the power from the upstream side to the second connection point on the power line becomes a predetermined reference power. Control. Therefore, the fact that the power provided from the power generation device to the second connection point of the power line at that time is not the maximum power provided means that the power generation device has a surplus power generation capacity.
Therefore, in this feature configuration, the control device switches to the third operation mode when the second operation mode is being executed, if the power provided from the power generation device to the second connection point of the power line is not the maximum power provided. That is, when the third operation mode is executed, the switch is switched to the second state, and the power conditioner charges and discharges so that the power provided from the power generation device to the second connection point of the power line becomes the maximum power provided. Charge the device. That is, it can be expected that the power generation device is operated in a state where the remaining power generation capacity of the power generation device is charged in the charging / discharging device and the maximum provided power is output.

Yet another characteristic configuration of the distributed power supply system according to the present invention is that when the control device is executing the third operation mode, the power provided from the power generation device to the second connection point of the power line is supplied. If it is the maximum provided power and the received power supplied from the power system to the power line is larger than the target received power, the point is to switch to the second operation mode.

When the third operation mode is being executed, the power conditioner adjusts the charging power of the charging / discharging device while being connected to the third connection point on the downstream side of the second connection point. Further, the power generation device provides the power provided to the power line within the range between the predetermined minimum provided power and the maximum provided power so that the power from the upstream side to the second connection point on the power line becomes a predetermined reference power. Control. Therefore, at that time, the fact that the power provided from the power generation device to the second connection point of the power line is the maximum power provided and the received power supplied from the power system to the power line is larger than the target received power means to the power generation device. It means that there is no surplus power generation capacity and the received power supplied from the power system to the power line is excessive.
Therefore, in this feature configuration, when the control device is executing the third operation mode, the power provided from the power generation device to the second connection point of the power line is the maximum power provided, and the power system supplies the power line to the power line. If the received power is larger than the target received power, the mode is switched to the second operation mode. That is, it can be expected that the power received from the power system is reduced by discharging the charging / discharging device in the second operation mode.

Yet another characteristic configuration of the distributed power generation system according to the present invention is that when the power generated by the photovoltaic power generation device is equal to or less than the set power generation power of the control device
The second operation mode in which the switch is switched to the first state and the charging / discharging device is discharged by the power conditioner so that the received power supplied from the power system to the power line becomes the target received power. Or,
The third operation in which the switch is switched to the second state and the charging / discharging device is charged and operated by the power conditioner so that the received power supplied from the power system to the power line becomes the target received power. The point is to execute the mode.

According to the above characteristic configuration, when the control device executes the second operation mode in a situation where the generated power of the photovoltaic power generation device is equal to or less than the set generated power, the control device switches the switch to the first state and starts from the power system. The charge / discharge device is discharged and operated by the power conditioner so that the received power supplied to the power line becomes the target received power. That is, the discharge power of the charging / discharging device can be utilized in order to set the received power supplied from the power system to the power line to a desired value (target received power).

Further, when the control device executes the third operation mode in a situation where the generated power of the photovoltaic power generation device is equal to or less than the set generated power, the control device switches the switch to the second state and is supplied from the power system to the power line. The charging / discharging device is charged and operated by the power conditioner so that the received power becomes the target received power. That is, the charging power of the charging / discharging device can be utilized in order to set the received power supplied from the power system to the power line to a desired value (target received power).

Yet another characteristic configuration of the distributed power supply system according to the present invention is that when the control device is executing the second operation mode, the discharge power of the charge / discharge device is zero and the power system If the received power supplied to the power line from the above is the target received power, the point is to switch to the third operation mode.

When the second operation mode is executed, the power conditioner adjusts the discharge power of the charging / discharging device while being electrically connected to the first connection point on the upstream side of the second connection point. .. Further, the power generation device provides the power provided to the power line within the range between the predetermined minimum provided power and the maximum provided power so that the power from the upstream side to the second connection point on the power line becomes a predetermined reference power. Control. Therefore, the fact that the discharge power of the charging / discharging device is zero at that time and the received power supplied from the power system to the power line is the target received power means that the power consumption of the power consuming device depends on the power provided by the power generation device. It means that there is a possibility that the power generation equipment has a surplus power generation capacity.
Therefore, in this feature configuration, when the control device is executing the second operation mode, the discharge power of the charge / discharge device is zero, and the received power supplied from the power system to the power line is the target received power. For example, it switches to the third operation mode. That is, when the third operation mode is executed, the switch is switched to the second state, and the charging / discharging device is charged by the power conditioner so that the received power supplied from the power system to the power line becomes the target received power. Activate. That is, it can be expected that the power generation device is operated in a state where the remaining power generation capacity of the power generation device is charged in the charging / discharging device and the maximum provided power is output.

Yet another characteristic configuration of the distributed power supply system according to the present invention is that when the control device is executing the third operation mode, the charging power of the charging / discharging device is zero, and the power system If the received power supplied from the power line to the power line is larger than the target received power, the second operation mode is switched to.

When the third operation mode is being executed, the power conditioner adjusts the charging power of the charging / discharging device while being connected to the third connection point on the downstream side of the second connection point. Further, the power generation device provides the power provided to the power line within the range between the predetermined minimum provided power and the maximum provided power so that the power from the upstream side to the second connection point on the power line becomes a predetermined reference power. Control. Therefore, at that time, the charging power of the charging / discharging device is zero, and the received power supplied from the power system to the power line is larger than the target received power, which means that the power generation device has no surplus power generation capacity and the power line from the power system. It means that the received power supplied to is excessive.
Therefore, in this feature configuration, when the control device is executing the third operation mode, the charging power of the charging / discharging device is zero, and the received power supplied from the power system to the power line is larger than the target received power. For example, it switches to the second operation mode. That is, it can be expected that the power received from the power system is reduced by discharging the charging / discharging device in the second operation mode.

The characteristic configuration of the distributed power supply system according to the present invention for achieving the above object is different from the power line connected to the power system, the photovoltaic power generation device, the charging / discharging device, and the photovoltaic power generation device. A distributed power system equipped with a power generator
A connection point to the power system is provided on the upstream side of the power line, and a first connection point, a second connection point, and a third connection point are formed on the power line from the connection point to the power system to the downstream side. It is provided in that order,
A power conditioner to which the photovoltaic power generation device and the charging / discharging device are connected,
A first state in which the power conditioner is electrically connected to the first connection point of the power line, and a second state in which the power conditioner is electrically connected to the third connection point of the power line. A switch that switches to either
Equipped with a control device
The power generation device is electrically connected to the second connection point of the power line, and a predetermined minimum provision is provided so that the power from the upstream side to the second connection point of the power line becomes a predetermined reference power. Control the power provided to the power line within the range between the power and the maximum power provided,
The power consuming device is electrically connected to the third connection point of the power line.
The control device is
When the generated power of the photovoltaic power generation device is larger than the set generated power, the switch is switched to the first state, and the power conditioner outputs the generated power of the photovoltaic power generation device to the switch side. Execute the first operation mode to operate
When the generated power of the photovoltaic power generation device is equal to or less than the set generated power, the second operation mode is executed in which the switch is switched to the second state and the charge / discharge device is charged / discharged by the power conditioner. At the point.

According to the above-mentioned characteristic configuration, the power generation device is a power line within a range between a predetermined minimum provided power and a predetermined maximum provided power so that the power from the upstream side to the second connection point in the power line becomes a predetermined reference power. Control the power provided to. That is, while ensuring that the power provided by the power generation device does not go upstream from the second connection point (that is, the power provided by the power generation device does not reverse power flow to the power system), it is downstream from the second connection point. Power can be supplied to the third connection point of.

In addition, the control device switches the switch to the first state when the first operation mode is executed under the condition that the generated power of the photovoltaic power generation device is larger than the set generated power, and the photovoltaic power generation device is operated by the power conditioner. It is operated so that the generated power of is output to the switch side. That is, since the photovoltaic power generation device is electrically connected to the first connection point via the power conditioner, the generated power of the photovoltaic power generation device is directed to the upstream side from the first connection point to the power system. It can be used to reverse power flow to the power or to move from the first connection point to the second connection point and consume it in a power consuming device or the like.

Further, when the control device executes the second operation mode in a situation where the generated power of the photovoltaic power generation device is equal to or less than the set generated power, the control device switches the switch to the second state and charges the charging / discharging device with the power conditioner. Operate the discharge. That is, since the charging / discharging device is electrically connected to the third connection point via the power conditioner, the charging / discharging device is charged with the power provided by the power generation device supplied to the second connection point. It can be utilized, and can be utilized for consuming the electric power discharged to the third connection point by the power consuming device.
Therefore, it is possible to provide a distributed power supply system that can utilize the charging / discharging device and the solar power generation device connected to one power conditioner in combination with the power generation device.

Yet another characteristic configuration of the distributed power generation system according to the present invention is that when the power generated by the photovoltaic power generation device is equal to or less than the set power generation power of the control device.
The switch is switched to the second state, and the power conditioner charges the power line so that the power from the second connection point to the third connection point of the power line becomes a set power equal to or higher than the maximum provided power. The point is to execute the second operation mode in which the discharge device is charged and discharged.

According to the above characteristic configuration, when the control device executes the second operation mode in a situation where the generated power of the photovoltaic power generation device is equal to or less than the set generated power, the control device switches the switch to the second state and sets the power line. The charge / discharge device is charged / discharged by the power conditioner so that the power from the 2 connection points to the 3rd connection point becomes the set power equal to or higher than the maximum provided power. That is, in the state where the switch is switched to the second state, the power consumption of the power consuming device connected to the third connection point and the power consumption of the charging / discharging device by the power from the second connection point to the third connection point of the power line. The sum of charge and discharge power is covered. At this time, the charging / discharging device is charged if the power consumption of the power consuming device is less than the set power, and discharged if the power consumption of the power consuming device is larger than the set power, and the second connection of the power line is made. Bring the power from the location to the third connection location closer to the above set power that is equal to or greater than the maximum power provided by the power generator. As a result, the power generation device can be expected to operate so as to supply the maximum provided power to the power line regardless of the power consumption of the power consumption device.

Yet another characteristic configuration of the distributed power supply system according to the present invention is that when the generated power of the photovoltaic power generation device is larger than the set generated power, the control device sets the switch as the first operation mode. Switching to the first state, the power conditioner outputs the generated power of the photovoltaic power generation device to the switch side and stops the charging / discharging of the charging / discharging device, or the power conditioner causes the said The point is that the charging / discharging device is charged with the generated power of the photovoltaic power generation device.

According to the above-mentioned feature configuration, when the generated power of the photovoltaic power generation device is larger than the set generated power, the generated power can be reverse-flowed to the power system or the generated power can be charged to the charging / discharging device. ..

Yet another characteristic configuration of the distributed power supply system according to the present invention is that between the switch and the third connection point, a neutral wire and a voltage wire constituting a single-phase three-wire electric path are used. It is at the point of being connected using.

According to the above-mentioned feature configuration, the switch and the third connection point are connected by using a total of two cables of a neutral wire and one voltage wire constituting a single-phase three-wire electric path. .. As a result, compared to the case where the switch and the third connection point are connected by using a total of three cables of the neutral wire and the two voltage wires constituting the single-phase three-wire electric path. Cable routing can be simplified. In particular, when the switch is installed outdoors together with a power conditioner and the third connection point of the power line exists indoors, the switch and the third connection point penetrate the wall of the building. It is necessary to provide holes, but even in such a case, the number of cables penetrating the wall of the building is reduced, so that the size of the holes can be increased.

It is a figure which shows the structure of the distributed power supply system of 1st Embodiment. It is a figure explaining the switching of the operation mode performed in the distributed power supply system of 1st Embodiment. It is a figure explaining the switching of the operation mode performed in 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 explaining the switching of the operation mode performed in the distributed power source system of 2nd Embodiment. It is a figure explaining the switching of the operation mode performed in the distributed power source system of 2nd Embodiment. It is a figure which shows the structure of the distributed power supply system of 3rd Embodiment. It is a figure explaining the switching of the operation mode performed in the distributed power source system of 3rd Embodiment. It is a figure explaining the switching of the operation mode performed in the distributed power source system of 3rd Embodiment. It is a figure which shows the structure of the distributed power supply system of 4th Embodiment. It is a figure which shows the state which the power conditioner is electrically connected to the 1st connection part of a power line. It is a figure which shows the state which the power conditioner is electrically connected to the 3rd connection point of a power line, and the critical power consumption device. It is a figure which shows the state which the power conditioner is electrically connected to the important power consumption device.

<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 supply system includes a power line 2, a photovoltaic power generation device 4, a charging / discharging device 5, and a fuel as a power generation device separate from the photovoltaic power generation device 4. It includes a battery device 10.
A connection point to the power system 1 is provided on the upstream side of the power line 2, and a first connection point P1 and a second connection point P2 and a third connection are provided on the power line 2 from the connection point to the power system 1 toward the downstream side. Locations P3 are provided in that order. In addition, the distributed power supply system includes a power conditioner 6 to which the photovoltaic power generation device 4 and the charging / discharging device 5 are connected, and a switch 7. The switch 7 electrically connects the power conditioner 6 to the first connection point P1 of the power line 2 and the power conditioner 6 to the third connection point P3 of the power line 2. It switches to either of the second states to be connected. The power consuming device 3 is electrically connected to the third connection point P3 of the power line 2.

[Power conditioner 6]
The power conditioner 6 is an operation of a power conditioner circuit unit 6a 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 6a thereof. A power conditioner control unit 6b for controlling the above is provided. The photovoltaic power generation device 4 is a device that receives sunlight and generates electricity, and is connected to the power conditioner circuit unit 6a. 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 6a. The power conditioner 6 controls an operation of outputting the generated power of the photovoltaic power generation device 4 to the switch 7 side, an operation of charging / discharging the charging / discharging device 5, and the like.
In the present embodiment, an example in which the power conditioner control unit 6b functions as the “control device” of the present invention will be described.

The power conditioner 6 is connected to the contact a of the switch 7 via the connection line 21. The contact b of the switch 7 is connected to the first connection point P1 of the power line 2 via the connection line 20, and the contact c of the switch 7 is connected to the third connection point P3 of the power line 2 via the connection line 22. Will be done. Therefore, when the contact a and the contact b of the switch 7 are connected, the power conditioner 6 is electrically connected to the first connection point P1 of the power line 2 via the switch 7. On the other hand, when the contact a and the contact c of the switch 7 are connected, the power conditioner 6 is electrically connected to the third connection point P3 of the power line 2 via the switch 7. In this way, the switch 7 connects the power conditioner 6 to the first connection point P1 of the power line 2 in the first state and the power conditioner 6 to the third connection point P3 of the power line 2. Switch to either of the second states of electrical connection. In the present embodiment, the operation of the switch 7 is controlled by the power conditioner control unit 6b.

Further, the power conditioner control unit 6b also obtains information on the generated power of the photovoltaic power generation device 4 and information on the charging power or the discharging power of the charging / discharging device 5.

[Fuel cell device 10]
The fuel cell device 10 as a power generation device includes a fuel cell unit 12 and a fuel cell control unit 11 that controls the operation of the fuel cell unit 12. The fuel cell unit 12 has a power conversion unit 12a for converting the electric power generated by the fuel cell 12b and the fuel cell 12b into electric power having a desired voltage, frequency, and phase and outputting the electric power to the power line 2. The fuel cell device 10 is electrically connected to the second connection point P2 of the power line 2 via the connection line 23.

The fuel cell 12b can be realized by using, for example, a solid oxide fuel cell (SOFC). Alternatively, the fuel cell 12b may be realized by using another type of fuel cell 12b such as a polymer electrolyte fuel cell (PEFC). Although not shown, the fuel cell unit 12 may be provided with a fuel reformer or the like that produces hydrogen or the like as a fuel gas to be supplied to the anode of the fuel cell 12b by a reforming process. Then, the fuel cell control unit 11 controls the operation start, operation stop, output state, and the like of the fuel cell 12b. Further, the fuel cell control unit 11 controls the power conversion operation by the power conversion unit 12a.

Information about the electric power measured by the electric power measuring instrument CT2 is transmitted to the fuel cell control unit 11. The power measuring instrument CT2 is provided on the upstream side (power system 1 side) of the second connection point P2 in the middle of the power line 2, and measures the power from the power system 1 side to the second connection point P2. The power measuring instrument CT2 is configured by using, for example, a current transformer (current transformer for instrument) used for detecting the current value of electric power in the power line 2, and is a product of a predetermined voltage value (for example, 100V, 200V, etc.). From, the power value on the power line 2 can be derived. The electric power measuring instrument CT2 may transmit only the current value of the electric power on the electric power line 2 to the fuel cell control unit 11, and the fuel cell control unit 11 may derive the electric power value.

The fuel cell control unit 11 of the fuel cell device 10 refers to the measurement result of the power measuring instrument CT2 and determines that the power from the upstream side to the second connection point P2 on the power line 2 becomes a predetermined reference power. The power provided to the power line 2 is controlled within the range between the minimum power provided and the maximum power provided. For example, the fuel cell control unit 11 of the fuel cell device 10 controls the power provided to the power line 2 so that the power from the upstream side to the second connection point P2 on the power line 2 is, for example, 50 W (an example of the reference power). To do.

Next, the control performed by the power conditioner control unit 6b of the power conditioner 6 will be described.
Information about the electric power measured by the electric power measuring instrument CT1 and the electric power measuring instrument CT3 is transmitted to the power conditioner control unit 6b. The power measuring instrument CT1 is provided on the upstream side (power system 1 side) of the first connection point P1 in the middle of the power line 2, and the power from the power system 1 side to the first connection point P1, that is, the power system 1 The received power supplied from the power line 2 to the power line 2 is measured. The power measuring instrument CT3 is provided in the middle of the connection line 23 connecting the fuel cell device 10 and the second connection point P2 of the power line 2, and measures the power provided from the fuel cell device 10 to the second connection point P2 of the power line 2. To do. The power measuring instruments CT1 and CT3 are configured by using, for example, a current transformer (current transformer for an instrument) used for detecting a current value of electric power, and are obtained from a product of a predetermined voltage value (for example, 100V, 200V, etc.). Each power value can be derived. The power measuring instruments CT1 and CT3 may transmit only the current value of the electric power to the power conditioner control unit 6b, and the power conditioner control unit 6b may derive the electric power value.

2 and 3 are diagrams illustrating switching of operation modes performed in the distributed power supply system of the first embodiment. In addition, in FIG. 2 and FIG. 3, the part to be operated is drawn with a thick line.
When the generated power of the solar power generation device 4 is larger than the set generated power (for example, when it is larger than 0 W), the power conditioner control unit 6b switches the switch 7 to the first state, and the power conditioner 6 generates solar power. The first operation mode in which the generated power of the device 4 is output to the switch 7 side is executed.
When the generated power of the photovoltaic power generation device 4 is equal to or less than the set generated power (for example, when it is 0 W or less), the power conditioner control unit 6b switches the switch 7 to the first state and charges / discharges the power conditioner 6. The second operation mode in which the device 5 is discharged and operated, or the third operation mode in which the switch 7 is switched to the second state and the charging / discharging device 5 is charged and operated by the power conditioner 6 is executed.
As described above, the first operation mode is the operation mode executed when the photovoltaic power generation device 4 is generating power, and the second operation mode and the third operation mode are when the photovoltaic power generation device 4 is not generating power. This is the operation mode to be executed.

[First operation mode]
The power conditioner control unit 6b switches the switch 7 to the first state as the first operation mode in the first operation mode to be executed when the generated power of the photovoltaic power generation device 4 is larger than the set generated power, and powers the power conditioner control unit 6b. The conditioner 6 outputs the generated power of the photovoltaic power generation device 4 to the switch 7 side and stops the charging / discharging of the charging / discharging device 5. As a result, the photovoltaic power generation device 4 is electrically connected to the first connection point P1 via the power conditioner 6, so that the generated power of the photovoltaic power generation device 4 is upstream from the first connection point P1. It can be used to reverse power flow to the power system 1 toward the power system 1 or to be consumed by the power consuming device 3 or the like by directing the power from the first connection point P1 to the second connection point P2. Alternatively, the power conditioner 6 may charge the charging / discharging device 5 with the generated power of the photovoltaic power generation device 4.

Then, the power conditioner control unit 6b switches to the second operation mode or the third operation mode when the generated power of the photovoltaic power generation device 4 becomes equal to or less than the set generated power while executing the first operation mode. Whether to switch to the second operation mode or the third operation mode can be set in advance. Further, the power conditioner control unit 6b switches to the first operation mode when the generated power of the photovoltaic power generation device 4 becomes larger than the set generated power when the second operation mode or the third operation mode is being executed.

[Second operation mode]
The power conditioner control unit 6b switches the switch 7 to the first state in the second operation mode to be executed when the generated power of the photovoltaic power generation device 4 is equal to or less than the set generated power, and the power system 1 to the power line 2 The charge / discharge device 5 is discharged and operated by the power conditioner 6 so that the received power supplied to is the target received power (for example, 50 W). As a result, the charging / discharging device 5 is electrically connected to the first connection point P1 via the power conditioner 6, so that the discharge power of the charging / discharging device 5 is transferred from the first connection point P1 to the second connection point. It can be used for directing to P2 and consuming it with a power consuming device 3 or the like. At this time, since the discharge power of the charge / discharge device 5 is supplied to the first connection point P1 on the upstream side of the second connection point P2, the fuel cell device 10 is provided according to the magnitude of the discharge power of the charge / discharge device 5. There is no need to limit the power.

When the second operation mode is being executed, the power conditioner 6 is electrically connected to the first connection point P1 on the upstream side of the second connection point P2, and the charging / discharging device 5 is connected. Adjust the discharge power of. Further, in the fuel cell device 10, the power line 2 is within a range between the predetermined minimum provided power and the maximum provided power so that the power from the upstream side to the second connection point P2 on the power line 2 becomes a predetermined reference power. Control the power provided to. Therefore, the fact that the power provided from the fuel cell device 10 to the second connection point P2 of the power line 2 at that time is not the maximum power provided means that the fuel cell device 10 has a surplus power generation capacity.

Therefore, in the present embodiment, the power conditioner control unit 6b provides the fuel cell device 10 to the second connection point P2 of the power line 2 as measured by the power measuring instrument CT3 when the second operation mode is being executed. If the power is not the maximum power provided, the mode is switched to the third operation mode described later. That is, when the third operation mode is executed, the switch 7 is switched to the second state, and the power provided from the fuel cell device 10 to the second connection point P2 of the power line 2 becomes the maximum provided power. The conditioner 6 charges and operates the charging / discharging device 5. That is, it can be expected that the fuel cell device 10 is operated in a state where the remaining power generation capacity of the fuel cell device 10 is charged to the charging / discharging device 5 and the maximum provided power is output.

[Third operation mode]
The power conditioner control unit 6b switches the switch 7 to the second state in the third operation mode to be executed when the generated power of the solar power generation device 4 is equal to or less than the set generated power, and measures the power with the power measuring device CT3. The power conditioner 6 charges and operates the charging / discharging device 5 so that the power provided from the fuel cell device 10 to the second connection point P2 of the power line 2 becomes the maximum provided power. As a result, the charging / discharging device 5 is electrically connected to the third connection point P3 via the power conditioner 6, so that the charging / discharging device 5 is supplied to the second connection point P2. It can be used to charge the provided power (for example, surplus power).

When the third operation mode is being executed, the power conditioner 6 adjusts the charging power of the charging / discharging device 5 while being connected to the third connection point P3 on the downstream side of the second connection point P2. To do. Further, in the fuel cell device 10, the power line 2 is within a range between the predetermined minimum provided power and the maximum provided power so that the power from the upstream side to the second connection point P2 on the power line 2 becomes a predetermined reference power. Control the power provided to. Therefore, at that time, the power provided from the fuel cell device 10 to the second connection point P2 of the power line 2 is the maximum power provided, and the received power supplied from the power system 1 to the power line 2 is larger than the target received power. This means that the fuel cell device 10 has no surplus power generation capacity and the received power supplied from the power system 1 to the power line 2 is excessive.

Therefore, in the present embodiment, the power conditioner control unit 6b provides the fuel cell device 10 to the second connection point P2 of the power line 2 as measured by the power measuring instrument CT3 when the third operation mode is being executed. If the electric power is the maximum provided electric power and the electric power supplied from the electric power system 1 to the electric power line 2 measured by the electric power measuring instrument CT1 is larger than the target electric power, the mode is switched to the second operation mode described above. That is, it can be expected that the power received from the power system 1 is reduced by discharging the charging / discharging device 5 in the second operation mode.

<Second Embodiment>
The distributed power supply system of the second embodiment is different from the above-described embodiment in the system configuration and the content of the control performed by the power conditioner control unit 6b. 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.

FIG. 4 is a diagram showing the configuration of the distributed power supply system of the second embodiment. As shown in the figure, the distributed power supply system of the present embodiment does not include the power measuring instrument CT3 provided in the distributed power supply system of the first embodiment.

5 and 6 are diagrams illustrating switching of operation modes performed in the distributed power supply system of the first embodiment.
When the generated power of the solar power generation device 4 is larger than the set generated power (for example, when it is larger than 0 W), the power conditioner control unit 6b switches the switch 7 to the first state, and the power conditioner 6 generates solar power. The first operation mode in which the generated power of the device 4 is output to the switch 7 side is executed.
When the generated power of the photovoltaic power generation device 4 is equal to or less than the set generated power (for example, when it is 0 W or less), the power conditioner control unit 6b switches the switch 7 to the first state and charges / discharges the power conditioner 6. The second operation mode in which the device 5 is discharged and operated, or the third operation mode in which the switch 7 is switched to the second state and the charging / discharging device 5 is charged and operated by the power conditioner 6 is executed.
As described above, the first operation mode is the operation mode executed when the photovoltaic power generation device 4 is generating power, and the second operation mode and the third operation mode are when the photovoltaic power generation device 4 is not generating power. This is the operation mode to be executed.

[First operation mode]
The power conditioner control unit 6b switches the switch 7 to the first state as the first operation mode in the first operation mode to be executed when the generated power of the photovoltaic power generation device 4 is larger than the set generated power, and powers the power conditioner control unit 6b. The conditioner 6 outputs the generated power of the photovoltaic power generation device 4 to the switch 7 side and stops the charging / discharging of the charging / discharging device 5. As a result, the photovoltaic power generation device 4 is electrically connected to the first connection point P1 via the power conditioner 6, so that the generated power of the photovoltaic power generation device 4 is upstream from the first connection point P1. It can be used to reverse power flow to the power system 1 toward the power system 1 or to be consumed by the power consuming device 3 or the like by directing the power from the first connection point P1 to the second connection point P2. Alternatively, the power conditioner 6 may charge the charging / discharging device 5 with the generated power of the photovoltaic power generation device 4.

Then, the power conditioner control unit 6b switches to the second operation mode or the third operation mode when the generated power of the photovoltaic power generation device 4 becomes equal to or less than the set generated power while executing the first operation mode. Whether to switch to the second operation mode or the third operation mode can be set in advance. Further, the power conditioner control unit 6b switches to the first operation mode when the generated power of the photovoltaic power generation device 4 becomes larger than the set generated power when the second operation mode or the third operation mode is being executed.

[Second operation mode]
The power conditioner control unit 6b switches the switch 7 to the first state in the second operation mode executed when the generated power of the solar power generation device 4 is equal to or less than the set generated power, and measures the power with the power measuring device CT1. The power conditioner 6 discharges and operates the charging / discharging device 5 so that the received power supplied from the power system 1 to the power line 2 becomes the target received power. As a result, the charging / discharging device 5 is electrically connected to the first connection point P1 via the power conditioner 6, so that the discharge power of the charging / discharging device 5 is transferred from the first connection point P1 to the second connection point. It can be used for directing to P2 and consuming it with a power consuming device 3 or the like. At this time, since the discharge power of the charge / discharge device 5 is supplied to the first connection point P1 on the upstream side of the second connection point P2, the fuel cell device 10 is provided according to the magnitude of the discharge power of the charge / discharge device 5. There is no need to limit the power.

When the second operation mode is being executed, the power conditioner 6 is electrically connected to the first connection point P1 on the upstream side of the second connection point P2, and the charging / discharging device 5 is connected. Adjust the discharge power of. Further, in the fuel cell device 10, the power line 2 is within a range between the predetermined minimum provided power and the maximum provided power so that the power from the upstream side to the second connection point P2 on the power line 2 becomes a predetermined reference power. Control the power provided to. Therefore, the fact that the discharge power of the charging / discharging device 5 is zero at that time and the received power supplied from the power system 1 to the power line 2 is the target received power means that the power is supplied by the fuel cell device 10. This means that the power consumption of the consumption device 3 can be covered and there is a possibility that the fuel cell device 10 has a surplus power generation capacity.

Therefore, in the present embodiment, when the power conditioner control unit 6b is executing the second operation mode, the discharge power of the charging / discharging device 5 is zero, and the power system is measured by the power measuring instrument CT1. If the received power supplied from 1 to the power line 2 is the target received power, the mode is switched to the third operation mode described later. That is, when the third operation mode is executed, the switch 7 is switched to the second state, and the power conditioner 6 is charged so that the received power supplied from the power system 1 to the power line 2 becomes the target received power. The discharge device 5 is charged and operated. That is, it can be expected that the fuel cell device 10 is operated in a state where the remaining power generation capacity of the fuel cell device 10 is charged to the charging / discharging device 5 and the maximum provided power is output.

[Third operation mode]
The power conditioner control unit 6b switches the switch 7 to the second state in the third operation mode to be executed when the generated power of the solar power generation device 4 is equal to or less than the set generated power, and measures the power with the power measuring device CT1. The power conditioner 6 charges and operates the charging / discharging device 5 so that the received power supplied from the power system 1 to the power line 2 becomes the target received power. As a result, the charging / discharging device 5 is electrically connected to the third connection point P3 via the power conditioner 6, so that the charging / discharging device 5 is supplied to the second connection point P2. It can be used to charge the provided power (for example, surplus power).

When the third operation mode is being executed, the power conditioner 6 adjusts the charging power of the charging / discharging device 5 while being connected to the third connection point P3 on the downstream side of the second connection point P2. To do. Further, in the fuel cell device 10, the power line 2 is within a range between the predetermined minimum provided power and the maximum provided power so that the power from the upstream side to the second connection point P2 on the power line 2 becomes a predetermined reference power. Control the power provided to. Therefore, at that time, the charging power of the charging / discharging device 5 is zero, and the received power supplied from the power system 1 to the power line 2 is larger than the target received power, which means that the fuel cell device 10 has no surplus power generation capacity. Moreover, it means that the received power supplied from the power system 1 to the power line 2 is excessive.

Therefore, in the present embodiment, when the power conditioner control unit 6b is executing the third operation mode, the charging power of the charging / discharging device 5 is zero, and the power system is measured by the power measuring device CT1. If the received power supplied from 1 to the power line 2 is larger than the target received power, the mode is switched to the second operation mode described above. That is, it can be expected that the power received from the power system 1 is reduced by discharging the charging / discharging device 5 in the second operation mode.

<Third Embodiment>
The distributed power supply system of the third embodiment is different from the above-described embodiment in the system configuration and the content of the control performed by the power conditioner control unit 6b. 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.

FIG. 7 is a diagram showing a configuration of a distributed power supply system according to a third embodiment. As shown in the figure, in the distributed power supply system of the present embodiment, information about the electric power measured by the electric power measuring instrument CT4 is transmitted to the power conditioner control unit 6b. The power measuring instrument CT4 is provided between the second connection point P2 and the third connection point P3 on the power line 2, and measures the power from the second connection point P2 to the third connection point P3 of the power line 2. The power measuring instrument CT4 is configured by using, for example, a current transformer (current transformer for measuring instruments) used for detecting the current value of electric power, and each electric power is obtained from the product of a predetermined voltage value (for example, 100V, 200V, etc.). The value can be derived. The power measuring instrument CT4 may transmit only the current value of the electric power to the power conditioner control unit 6b, and the power conditioner control unit 6b may derive the electric power value.

8 and 9 are diagrams illustrating switching of operation modes performed in the distributed power supply system of the third embodiment.
When the generated power of the solar power generation device 4 is larger than the set generated power (for example, when it is larger than 0 W), the power conditioner control unit 6b switches the switch 7 to the first state, and the power conditioner 6 generates solar power. The first operation mode in which the generated power of the device 4 is output to the switch 7 side is executed.
When the generated power of the photovoltaic power generation device 4 is equal to or less than the set generated power, the power conditioner control unit 6b switches the switch 7 to the second state and charges / discharges the charge / discharge device 5 with the power conditioner 6. 2 Execute the operation mode.
As described above, the first operation mode is the operation mode executed when the photovoltaic power generation device 4 is generating power, and the second operation mode is the operation executed when the photovoltaic power generation device 4 is not generating power. The mode.

[First operation mode]
The power conditioner control unit 6b switches the switch 7 to the first state as the first operation mode in the first operation mode to be executed when the generated power of the photovoltaic power generation device 4 is larger than the set generated power, and powers the power conditioner control unit 6b. The conditioner 6 outputs the generated power of the photovoltaic power generation device 4 to the switch 7 side and stops the charging / discharging of the charging / discharging device 5. Alternatively, the power conditioner 6 may charge the charging / discharging device 5 with the generated power of the photovoltaic power generation device 4.

The power conditioner control unit 6b switches to the second operation mode when the generated power of the photovoltaic power generation device 4 becomes equal to or less than the set generated power while executing the first operation mode.

[Second operation mode]
The power conditioner control unit 6b switches the switch 7 to the second state in the second operation mode executed when the generated power of the photovoltaic power generation device 4 is equal to or less than the set generated power, and connects the second connection of the power line 2 to the second state. The power conditioner 6 charges and discharges the charge / discharge device 5 so that the power from the location P2 to the third connection location P3 becomes a set power (for example, 700 W or the like) equal to or higher than the maximum provided power. As a result, the charging / discharging device 5 is electrically connected to the third connection point P3 via the power conditioner 6, so that the charging / discharging device 5 is supplied to the second connection point P2. It can be utilized for charging the provided electric power of the above, and can be utilized for consuming the electric power discharged to the third connection point P3 in the power consuming device 3.

Specifically, in the state where the switch 7 is switched to the second state, the power consumption connected to the third connection point P3 by the power from the second connection point P2 of the power line 2 to the third connection point P3. The sum of the power consumption of the device 3 and the charge / discharge power of the charge / discharge device 5 is covered. At this time, the charging / discharging device 5 is charged if the power consumption of the power consuming device 3 is less than the set power, and discharged if the power consumption of the power consuming device 3 is larger than the set power. The power from the second connection point P2 to the third connection point P3 is brought closer to the set power equal to or higher than the maximum provided power of the fuel cell device 10. As a result, the fuel cell device 10 can be expected to operate so as to supply the maximum provided power to the power line 2 regardless of the magnitude of the power consumption of the power consumption device 3.

<Fourth Embodiment>
The distributed power supply system of the fourth embodiment has a different system configuration from the above-described embodiment. The distributed power supply system of the fourth embodiment will be described below, but the description of the same configuration as that of the above embodiment will be omitted.

FIG. 10 is a diagram showing a configuration of a distributed power supply system according to a fourth embodiment. Note that FIG. 10 is an example in which a change is made to FIG. 1 shown in the first embodiment, and the following description describes the changes from the first embodiment.
As shown in the figure, an important power consuming device 30 is provided in which power is preferentially supplied even when the power supply from the power system 1 is stopped. For example, the important power consumption device 30 includes a lighting device at a main location in a building where a distributed power supply system is installed, a refrigerator, and the like. It should be noted that which device is the important power consuming device 30 and which device is the power consuming device 3 can be appropriately set. The connection line 26, the switch 9, and the connection line 25 exist between the critical power consumption device 30 and the third connection point P3 of the power line 2. Further, there are a connection line 21a (21), a switch 8 and a connection line 21b (21) between the power conditioner 6 and the switch 7. The operation of the switch 8 and the switch 9 is controlled by the power conditioner control unit 6b of the power conditioner 6.

The contact b of the switch 8 is connected to the switch 7 via the connection line 21b, and the contact c of the switch 8 is connected to the switch 9 via the connection line 24. Therefore, when the contact a and the contact b of the switch 8 are connected, the power conditioner 6 is electrically connected to the switch 7 via the switch 8. On the other hand, when the contact a and the contact c of the switch 8 are connected, the power conditioner 6 is electrically connected to the switch 9 via the switch 8.

The contact c of the switch 9 is connected to the switch 8 via the connection line 24, and the contact b of the switch 9 is connected to the switch 7 and the third connection point P3 of the power line 2 via the connection line 26. To. Therefore, when the contact a and the contact c of the switch 9 are connected, the critical power consumption device 30 is electrically connected to the switch 8 via the switch 9. On the other hand, when the contact a and the contact b of the switch 9 are connected, the critical power consumption device 30 is electrically connected to the switch 7 and the third connection point P3 of the power line 2 via the switch 9. Connected to.

In the present embodiment, at least the connecting line 24, the connecting line 25, and the connecting line 26 are connected by using a neutral wire and one voltage wire constituting a single-phase three-wire electric path. That is, the switch 7 and the third connection point P3 are connected by using a neutral wire and one voltage wire constituting a single-phase three-wire electric path. In this way, the switch 7 and the third connection point P3 are connected by using a total of two cables, that is, a neutral wire and one voltage wire that form a single-phase three-wire electric path. Compared to the case where the switch 7 and the third connection point P3 are connected by using a total of three cables of the neutral wire and the two voltage wires constituting the single-phase three-wire electric circuit. Cable routing can be simplified. In particular, when the switch 7 is installed outdoors together with the power conditioner 6 and the like and the third connection point P3 of the power line 2 exists indoors, between the switch 7 and the third connection point P3. It is necessary to provide a hole through the wall of the building, but even in such a case, the number of cables penetrating the wall of the building is reduced, so that the size of the hole can be increased.

Next, the switching state of the switch 7, the switch 8, and the switch 9 will be described.
FIG. 11 is a diagram showing a state in which the power conditioner 6 is electrically connected to the first connection portion P1 of the power line 2 via the switch 8 and the switch 7. This state indicates a state in which the power conditioner 6 and the fuel cell device 10 are connected to the power system 1, and the power conditioner control unit 6b is the first operation shown in FIG. 2 of the first embodiment. The same control as the mode (the charging / discharging device 5 is stopped or charged) and the second operation mode (the charging / discharging device 5 is discharging) shown in FIG. 3 is performed.

FIG. 12 is a diagram showing a state in which the power conditioner 6 is electrically connected to the third connection point P3 of the power line 2 and the critical power consumption device 30 via the switch 8 and the switch 7. .. This state indicates a state in which the power conditioner 6 and the fuel cell device 10 are connected to the power system 1, and the power conditioner control unit 6b is the third operation shown in FIG. 3 of the first embodiment. The same control as the mode (charging of the charging / discharging device 5) is performed.

FIG. 13 is a diagram showing a state in which the power conditioner 6 is electrically connected to the critical power consuming device 30 via the switch 8. This state indicates a state in which the photovoltaic power generation device 4 and the charging / discharging device 5 connected to the power conditioner 6 are separated from the power system 1 and operate independently, and the power conditioner control unit 6b is used for photovoltaic power generation. The device 4 and the charging / discharging device 5 are used to control the voltage of the connection line 24 and the connection line 25 to which the critical power consumption device 30 is connected to a set voltage. As a result, power is supplied only to the critical power consuming device 30.

Although not shown, in the same manner as described above, changes are made to add the switch 8 and the switch 9 to FIG. 4 shown in the second embodiment, and in the third embodiment. It is also possible to make changes to the described FIG. 7 by adding a switch 8 and a switch 9.

For example, when the same change is made to FIG. 4 shown in the second embodiment, the power conditioner 6 is electrically connected to the first connection point P1 of the power line 2 via the switch 8 and the switch 7. In this state (similar to FIG. 11), the power conditioner control unit 6b is in the first operation mode shown in FIG. 5 (the charging / discharging device 5 is stopped or charged), and the second operation shown in FIG. The same control as the mode (the charging / discharging device 5 discharges) is performed. Further, the power conditioner 6 is electrically connected to the third connection point P3 of the power line 2 and the critical power consumption device 30 via the switch 8 and the switch 7 (similar to FIG. 12). In, the power conditioner control unit 6b performs the same control as the third operation mode (charging / discharging device 5 is charging) shown in FIG.

When the same modification is made to FIG. 7 shown in the third embodiment, the power conditioner 6 is electrically connected to the first connection point P1 of the power line 2 via the switch 8 and the switch 7. In the state (similar to FIG. 11), the power conditioner control unit 6b performs the same control as the first operation mode (the charging / discharging device 5 is stopped or charged) shown in FIG. Further, the power conditioner 6 is electrically connected to the third connection point P3 of the power line 2 and the critical power consumption device 30 via the switch 8 and the switch 7 (similar to FIG. 12). In the power conditioner control unit 6b, the power conditioner control unit 6b performs the same control as the second operation mode (charge / discharge device 5 charges / discharges) shown in FIG.

<Another Embodiment>
<1>
In the above embodiment, the configuration of the distributed power supply system of the present invention has been described with reference to specific examples, but the configuration can be changed as appropriate.
For example, the configuration of the fuel cell device 10 and the like is not limited to the one shown in the figure and can be changed as appropriate.
Further, in the above embodiment, the example in which the power conditioner control unit 6b functions as the control device of the present invention has been described, but an independent control device may be provided, or a control unit mounted on another device may be provided. It may function as the control device of the present invention.

<2>
In the above embodiment, the reference power (for example, 50 W) for the fuel cell device 10, the set power generation power (for example, 0 W, etc.) for the photovoltaic power generation device 4, the target received power (for example, 50 W, etc.), and the set power (for example, 700 W, etc.) Although specific numerical values have been given and described, those values are described for the purpose of exemplification and can be changed as appropriate.

<3>
In the above embodiment, the fuel cell device 10 is given as an example of the power generation device of the present invention, but various other power generation devices whose output can be freely adjusted within a range between a predetermined minimum provided power and a maximum provided power. Can be used. For example, a type of power generation device including an engine and a generator driven by the engine can be used.

<4>
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.

INDUSTRIAL APPLICABILITY The present invention can be used in a distributed power supply system in which a charging / discharging device connected to one power conditioner and a photovoltaic power generation device can be utilized in combination with a power generation device.

1 Power system 2 Power line 3 Power consumption device 4 Photovoltaic power generation device 5 Charging / discharging device 6 Power conditioner 6b Power conditioner control unit (control device)
7 Switch 10 Fuel cell device (power generation device)
30 Important power consuming device P1 1st connection point P2 2nd connection point P3 3rd connection point

Claims (11)

A distributed power 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 different from the photovoltaic power generation device.
A connection point to the power system is provided on the upstream side of the power line, and a first connection point, a second connection point, and a third connection point are formed on the power line from the connection point to the power system to the downstream side. It is provided in that order,
A power conditioner to which the photovoltaic power generation device and the charging / discharging device are connected,
A first state in which the power conditioner is electrically connected to the first connection point of the power line, and a second state in which the power conditioner is electrically connected to the third connection point of the power line. A switch that switches to either
Equipped with a control device
The power generation device is electrically connected to the second connection point of the power line, and a predetermined minimum provision is provided so that the power from the upstream side to the second connection point of the power line becomes a predetermined reference power. Control the power provided to the power line within the range between the power and the maximum power provided,
The power consuming device is electrically connected to the third connection point of the power line.
The control device is
When the generated power of the photovoltaic power generation device is larger than the set generated power, the switch is switched to the first state, and the power conditioner outputs the generated power of the photovoltaic power generation device to the switch side. Execute the first operation mode to operate
When the generated power of the photovoltaic power generation device is equal to or less than the set generated power, the second operation mode in which the switch is switched to the first state and the charge / discharge device is discharged and operated by the power conditioner, or the said. A distributed power generation system that executes a third operation mode in which the switch is switched to the second state and the charging / discharging device is charged and operated by the power conditioner. When the generated power of the solar power generation device is equal to or less than the set generated power, the control device is used.
The second operation mode in which the switch is switched to the first state and the charging / discharging device is discharged by the power conditioner so that the received power supplied from the power system to the power line becomes the target received power. Or,
The switch is switched to the second state, and the charging / discharging device is charged and operated by the power conditioner so that the power provided from the power generation device to the second connection portion of the power line becomes the maximum provided power. The distributed power supply system according to claim 1, wherein the third operation mode is executed. When the control device is executing the second operation mode, if the power provided from the power generation device to the second connection point of the power line is not the maximum power provided, the control device is requested to switch to the third operation mode. Item 2. The distributed power supply system according to Item 2. When the control device is executing the third operation mode, the power provided from the power generation device to the second connection point of the power line is the maximum power provided, and the power system transfers the power line to the power line. The distributed power supply system according to claim 2 or 3, wherein if the supplied power is larger than the target power received, the second operation mode is switched to. When the generated power of the solar power generation device is equal to or less than the set generated power, the control device is used.
The second operation mode in which the switch is switched to the first state and the charging / discharging device is discharged by the power conditioner so that the received power supplied from the power system to the power line becomes the target received power. Or,
The third operation in which the switch is switched to the second state and the charging / discharging device is charged and operated by the power conditioner so that the received power supplied from the power system to the power line becomes the target received power. The distributed power system according to claim 1, wherein the mode is executed. When the control device is executing the second operation mode, the discharge power of the charge / discharge device is zero, and the received power supplied from the power system to the power line is the target received power. For example, the distributed power supply system according to claim 5, which switches to the third operation mode. When the control device is executing the third operation mode, the charging power of the charging / discharging device is zero, and the received power supplied from the power system to the power line is larger than the target received power. For example, the distributed power supply system according to claim 5 or 6, which switches to the second operation mode. A distributed power 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 different from the photovoltaic power generation device.
A connection point to the power system is provided on the upstream side of the power line, and a first connection point, a second connection point, and a third connection point are formed on the power line from the connection point to the power system to the downstream side. It is provided in that order,
A power conditioner to which the photovoltaic power generation device and the charging / discharging device are connected,
A first state in which the power conditioner is electrically connected to the first connection point of the power line, and a second state in which the power conditioner is electrically connected to the third connection point of the power line. A switch that switches to either
Equipped with a control device
The power generation device is electrically connected to the second connection point of the power line, and a predetermined minimum provision is provided so that the power from the upstream side to the second connection point of the power line becomes a predetermined reference power. Control the power provided to the power line within the range between the power and the maximum power provided,
The power consuming device is electrically connected to the third connection point of the power line.
The control device is
When the generated power of the photovoltaic power generation device is larger than the set generated power, the switch is switched to the first state, and the power conditioner outputs the generated power of the photovoltaic power generation device to the switch side. Execute the first operation mode to operate
When the generated power of the photovoltaic power generation device is equal to or less than the set generated power, the second operation mode is executed in which the switch is switched to the second state and the charge / discharge device is charged / discharged by the power conditioner. Distributed power system. When the generated power of the solar power generation device is equal to or less than the set generated power, the control device is used.
The switch is switched to the second state, and the power conditioner charges the power line so that the power from the second connection point to the third connection point of the power line becomes a set power equal to or higher than the maximum provided power. The distributed power supply system according to claim 8, wherein the second operation mode for charging / discharging the discharge device is executed. When the generated power of the solar power generation device is larger than the set generated power, the control device switches the switch to the first state as the first operation mode, and the power conditioner causes the sunlight. A request to output the generated power of the power generation device to the switch side and stop the charging / discharging of the charging / discharging device, or to charge the charging / discharging device with the generated power of the photovoltaic power generation device by the power conditioner. The distributed power generation system according to any one of Items 1 to 9. Any one of claims 1 to 10 in which the switch and the third connection point are connected by using a neutral wire and one voltage wire constituting a single-phase three-wire electric path. Distributed power supply system described in.

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