JP7365950B2 - fuel cell equipment - Google Patents

Description

The present invention relates to fuel cell equipment in which a power line to which a plurality of fuel cell systems each having a fuel cell device, an important power load device, and a general power load device are connected is connected to an electric power system.

When a power generation device is installed in a facility such as a residence or a business office, even if a power outage occurs in the power system, the power generation device may be able to operate autonomously within the facility and receive power supply. In addition, in the case of a fuel cell device used as a power generation device, it is necessary to feed fuel gas and oxygen to the fuel cell and circulate cooling water, so auxiliary equipment such as pumps and blowers must be operated for this purpose. It is necessary to do so. When the fuel cell device is connected to the power grid, the power necessary for the operation of the auxiliary equipment, that is, the power necessary to start the power generation operation of the fuel cell device, is procured from the power grid when power generation is stopped. power generation operation.
However, if a power outage occurs in the power grid, there is a problem in that the power necessary for starting the power generation operation of the fuel cell device cannot be procured from the power grid.

Patent Document 1 (International Publication No. 2017/154802) describes a system that includes an auxiliary power supply section (alternator, battery, etc.) for supplying power to auxiliary equipment of a fuel cell device during a power outage in the power system. Are listed. By having such an auxiliary power supply unit, even during a power outage in the power grid, the fuel cell device can start operating and reduce the power load in the facility where the fuel cell device is installed. Can supply power to the device.

Patent Document 2 (Japanese Unexamined Patent Publication No. 2007-128785) describes a fuel cell facility in which a power line to which a plurality of residential units (fuel cell systems) each having a fuel cell device and a power load device are connected is connected to the power grid. has been done. In this fuel cell facility, a dwelling unit having a fuel cell device that is not generating power can receive power from the fuel cell device of another dwelling unit.

International Publication No. 2017/154802 Japanese Patent Application Publication No. 2007-128785

The system described in Patent Document 1 requires an auxiliary power supply section such as an alternator and a battery, which causes a problem in that the cost of the system increases.

Patent Document 2 describes that power is supplied from another fuel cell device via a power line to a residential unit having a fuel cell device that is not generating power. However, Patent Document 2 does not describe a disconnection function that separates the power line network that connects each residential unit from the power system, or a disconnection function that separates the power line network that connects each residential unit at a desired position. .
Therefore, in the event of a power outage in the power system, it is difficult to determine whether or not power will be supplied from the fuel cell device that is generating power to the residential unit whose fuel cell device is not generating power via the power line network that connects each residential unit. It is unknown whether or not it is possible to start operating a fuel cell device that has stopped generating electricity using the electric power supplied from a fuel cell device that is generating electricity in the event of a power outage in the power system. Furthermore, it is unclear whether the area to which power is supplied can be selectively switched by a technique such as separating the power line network connecting each residential unit at a desired position. For example, it is unclear whether it is possible to perform control such as selectively supplying power to a specific dwelling unit or to a specific power consumption device within a specific dwelling unit.

In addition, in the fuel cell equipment of Patent Document 2, even if during a power outage in the power system, power is supplied from the fuel cell device in power generation operation to a residential unit having a fuel cell device in which power generation is stopped, the fuel cell device in power generation operation If the number of fuel cell devices is small, that is, if the total power supplied from the fuel cell devices that are generating power is small, it may not be possible to supply the necessary power to all the residential units that have fuel cell devices that are not generating power. There is sex.

The present invention has been made in view of the above problems, and its purpose is to provide a fuel cell facility that can supply the power required by a fuel cell system having a fuel cell device that is not generating power. .

The characteristic configuration of the fuel cell equipment according to the present invention for achieving the above object is such that a power line to which a plurality of fuel cell systems each having a fuel cell device and a power load device is connected receives power through a power receiving equipment having a circuit breaker. A fuel cell facility connected to a grid,
A shared power load device is connected to the power line,
During interconnected operation in which the power line is connected to the power grid, in the plurality of fuel cell systems, the sum of the maximum generated power of the fuel cell devices in power generation operation is equal to the power generated by the fuel cell devices in power generation stop mode. Generate power so that the total amount of power required to start operation is greater than or equal to the sum of the total power load of the power load devices in the plurality of fuel cell systems, and the maximum load power of the shared power load device. determining the fuel cell device to operate;
When an abnormality occurs in the power system, the power line is disconnected from the power system by the circuit breaker of the power receiving equipment, and in the fuel cell system having the fuel cell device in power generation operation, the power load device and at least one of the fuel cell systems having the fuel cell device in power generation operation is supplied with power to the power line, and the fuel cell device is stopped in power generation. In the fuel cell system having the fuel cell system, the fuel cell device starts power generation operation by consuming power supplied from the power line, and in the fuel cell system having the fuel cell device in which power generation is stopped, power is supplied from the power line. The power load device can operate by consuming the power supplied from the power line, and the shared power load device can operate by consuming the power supplied from the power line.
Here, the power load device includes an important power load device and a general power load device, and the fuel cell system becomes independent from the fuel cell device performing power generation operation after an abnormality occurs in the power system. The configuration may be such that power is supplied to the important power load device via an output line.

According to the characteristic configuration described above, the number of fuel cell devices operating to generate power during grid-connected operation when the power line is connected to the power grid is such that the total maximum generated power of the fuel cell devices operating to generate power is equal to The total power required to start the power generation operation of the fuel cell device, the total maximum load power of the power load devices in the multiple fuel cell systems, and the maximum load power of the shared power load device is greater than or equal to the sum of the total power required to start power generation operation of the fuel cell device, It is determined. If the power line is disconnected from the power grid and power is no longer supplied to the power line from the power grid, a fuel cell system that includes a fuel cell device that is in power generation operation will not be able to supply power to the power load device. and at least one of the fuel cell systems having the fuel cell device in power generation operation is supplied with power to the power line, and in the fuel cell system having the fuel cell device in stop of power generation, power is supplied from the power line. The fuel cell device can start power generation operation by consuming the power supplied from the power line, and in a fuel cell system having the fuel cell device whose power generation is stopped, the power load device can operate by consuming the power supplied from the power line, and The shared power load device can operate by consuming power supplied from the power line.
Therefore, it is possible to provide a fuel cell facility that can supply the power required by a fuel cell system having a fuel cell device that is not generating power.

Another characteristic configuration of the fuel cell equipment according to the present invention is that a power line to which a plurality of fuel cell systems each having a fuel cell device and a power load device are connected is connected to a power system via a power receiving equipment having a circuit breaker. A fuel cell facility with
A shared power load device is connected to the power line,
The power load device includes an important power load device and a general power load device,
During interconnected operation in which the power line is connected to the power grid, in the plurality of fuel cell systems, the sum of the maximum generated power of the fuel cell devices in power generation operation is equal to the power generated by the fuel cell devices in power generation stop mode. so that it is greater than or equal to the sum of the total power required to start operation, the total maximum load power of the important power load devices in the plurality of fuel cell systems, and the maximum load power of the shared power load device, determining the fuel cell device to perform power generation operation;
When an abnormality occurs in the power system, the power line is disconnected from the power system by the circuit breaker of the power receiving equipment, and in the fuel cell system having the fuel cell device in power generation operation, the important power load is At least one of the fuel cell systems including the fuel cell device is supplied with power to the device, and the fuel cell device is in power generation operation, and power is supplied to the power line, and the fuel cell is stopped in power generation. In the fuel cell system having the device, the fuel cell device starts power generation operation by consuming power supplied from the power line, and in the fuel cell system having the fuel cell device in which power generation is stopped, power is supplied from the power line. The important power load device can operate by consuming the power supplied, and the shared power load device can operate by consuming the power supplied from the power line.
Here, in the fuel cell system, after an abnormality occurs in the power system, power is supplied from the fuel cell device performing power generation operation to the important power load device via the independent output line. may be configured.

According to the characteristic configuration described above, the number of fuel cell devices operating to generate power during grid-connected operation when the power line is connected to the power grid is such that the total maximum generated power of the fuel cell devices operating to generate power is equal to The total power required to start the power generation operation of the fuel cell device, the total maximum load power of important power load devices in multiple fuel cell systems, and the maximum load power of shared power load devices, so that the total power is greater than or equal to the sum of determined. If a power line is disconnected from the power grid and power is no longer supplied to the power line from the power grid, a fuel cell system with a fuel cell device in power generation operation will not be able to supply power to important power load devices. and power is supplied to the power line from at least one of the fuel cell systems that have a fuel cell device that is in power generation operation, and in a fuel cell system that has a fuel cell device that is not generating power, power is supplied from the power line. The fuel cell device can start power generation operation by consuming the power that is generated, and in a fuel cell system having a fuel cell device that is not generating power, the important power load device can operate by consuming the power supplied from the power line, In addition, the shared power load device can operate by consuming power supplied from the power line.
Therefore, it is possible to provide a fuel cell facility that can supply the power required by a fuel cell system having a fuel cell device that is not generating power.

Another characteristic configuration of the fuel cell equipment according to the present invention is that a power line to which a plurality of fuel cell systems each having a fuel cell device and a power load device are connected is connected to a power system via a power receiving equipment having a circuit breaker. A fuel cell facility with
The power load device includes an important power load device and a general power load device,
During interconnected operation in which the power line is connected to the power grid, in the plurality of fuel cell systems, the sum of the maximum generated power of the fuel cell devices in power generation operation is equal to the power generated by the fuel cell devices in power generation stop mode. determining the fuel cell device to be operated to generate electricity so that the total amount of power required to start operation is greater than or equal to the sum of the maximum load power of the important power load devices in the plurality of fuel cell systems;
When an abnormality occurs in the power system, the power line is disconnected from the power system by the circuit breaker of the power receiving equipment, and in the fuel cell system having the fuel cell device in power generation operation, the important power load is Electric power is supplied to the device, and power is supplied to the power line from at least one of the fuel cell systems having the fuel cell device that is in power generation operation, and the fuel cell device that is not generating power is supplied with power to the power line. In the fuel cell system having the fuel cell system, the fuel cell device starts power generation operation by consuming power supplied from the power line, and in the fuel cell system having the fuel cell device in which power generation is stopped, the power supplied from the power line is consumed. The important power load device is configured to be able to operate by consuming power.
Here, in the fuel cell system, after an abnormality occurs in the power system, power is supplied from the fuel cell device performing power generation operation to the important power load device via the independent output line. may be configured.

According to the characteristic configuration described above, the number of fuel cell devices operating to generate power during grid-connected operation when the power line is connected to the power grid is such that the total maximum generated power of the fuel cell devices operating to generate power is equal to It is determined to be greater than or equal to the sum of the total power required to start power generation operation of the fuel cell device and the total maximum load power of important power load devices in the plurality of fuel cell systems. If a power line is disconnected from the power grid and power is no longer supplied to the power line from the power grid, a fuel cell system with a fuel cell device in power generation operation will not be able to supply power to important power load devices. and power is supplied to the power line from at least one of the fuel cell systems having the fuel cell device that is in power generation operation, and power is supplied from the power line to the fuel cell system having the fuel cell device that is not generating power. In a fuel cell system having a fuel cell device that consumes electric power to start power generation operation, and that has a fuel cell device that is not generating power, important power load devices can operate by consuming electric power supplied from the power line.
Therefore, it is possible to provide a fuel cell facility that can supply the power required by a fuel cell system having a fuel cell device that is not generating power.

Another characteristic configuration of the fuel cell equipment according to the present invention is that a power line to which a plurality of fuel cell systems each having a fuel cell device and a power load device are connected is connected to a power system via a power receiving equipment having a circuit breaker. A fuel cell facility with
The power load device includes an important power load device and a general power load device,
During interconnected operation in which the power line is connected to the power grid, in the plurality of fuel cell systems, the sum of the maximum generated power of the fuel cell devices in power generation operation is equal to the power generated by the fuel cell devices in power generation stop mode. The power generation operation is performed so that the sum of the total power required to start the operation and the sum of the maximum load power of the important power load devices in the fuel cell system having the fuel cell device that is in power generation operation is greater than or equal to the sum of the total power required to start the operation. determining the fuel cell device;
When an abnormality occurs in the power system, the power line is disconnected from the power system by the circuit breaker of the power receiving equipment, and in the fuel cell system having the fuel cell device in power generation operation, the important power load is Electric power is supplied to the device, and power is supplied to the power line from at least one of the fuel cell systems having the fuel cell device that is in power generation operation, and the fuel cell device that is not generating power is supplied with power to the power line. The fuel cell system is configured such that the fuel cell device starts power generation operation by consuming the power supplied from the power line.
Here, in the fuel cell system, after an abnormality occurs in the power system, power is supplied from the fuel cell device performing power generation operation to the important power load device via the independent output line. may be configured.

According to the characteristic configuration described above, the number of fuel cell devices operating to generate power during grid-connected operation when the power line is connected to the power grid is such that the total maximum generated power of the fuel cell devices operating to generate power is equal to determined to be greater than or equal to the sum of the total power required to start power generation operation of the fuel cell device and the sum of the maximum load power of important power load devices in the fuel cell system having the fuel cell device in power generation operation. Ru. If a power line is disconnected from the power grid and power is no longer supplied to the power line from the power grid, a fuel cell system with a fuel cell device in power generation operation will not be able to supply power to important power load devices. and power is supplied to the power line from at least one of the fuel cell systems having the fuel cell device that is in power generation operation, and power is supplied from the power line to the fuel cell system having the fuel cell device that is not generating power. The fuel cell device can start power generation operation by consuming electric power.
Therefore, it is possible to provide a fuel cell facility that can supply the power required by a fuel cell system having a fuel cell device that is not generating power.

Another characteristic configuration of the fuel cell equipment according to the present invention is that a power line to which a plurality of fuel cell systems each having a fuel cell device and a power load device are connected is connected to a power system via a power receiving equipment having a circuit breaker. A fuel cell facility with
The power load device includes an important power load device and a general power load device,
During interconnected operation in which the power line is connected to the power grid, in the plurality of fuel cell systems, the total of the maximum generated power of the fuel cell devices in power generation operation is greater than the total of the maximum generated power of the fuel cell devices in power generation operation. the total amount of power required to start power generation operation of the fuel cell device with the highest startup order priority, and the maximum load power of the important power load device in the fuel cell system having the fuel cell device in power generation operation. determining the fuel cell device to be operated to generate electricity so that the total is greater than or equal to the sum of;
When an abnormality occurs in the power system, the power line is disconnected from the power system by the circuit breaker of the power receiving equipment, and in the fuel cell system having the fuel cell device in power generation operation, the important power load is At least one of the fuel cell systems including the fuel cell device is supplied with power to the device, and the fuel cell device is in power generation operation, and power is supplied to the power line, and the fuel cell is stopped in power generation. Among the devices, power is supplied from the power line to the fuel cell system having the fuel cell device in descending order of startup priority, and the fuel cell device starts power generation operation. It is at the point where it is done.
Here, in the fuel cell system, after an abnormality occurs in the power system, power is supplied from the fuel cell device performing power generation operation to the important power load device via the independent output line. may be configured.

According to the characteristic configuration described above, the number of fuel cell devices operating to generate power during grid-connected operation when the power line is connected to the power grid is such that the total maximum generated power of the fuel cell devices operating to generate power is equal to The total amount of power required to start power generation operation of the fuel cell device with the highest start-up priority among the fuel cell devices, and the maximum load of important power load devices in the fuel cell system that has the fuel cell device in power generation operation. The total power is determined to be greater than or equal to the sum of . If a power line is disconnected from the power grid and power is no longer supplied to the power line from the power grid, a fuel cell system with a fuel cell device in power generation operation will not be able to supply power to important power load devices. and power is supplied to the power line from at least one of the fuel cell systems having a fuel cell device in power generation operation, and among the fuel cell devices in which power generation is stopped, the priority in the startup order is Electric power is supplied from the power line to the fuel cell system having the fuel cell device that is not generating power in descending order of height, and the fuel cell device can start power generation operation.
Therefore, it is possible to provide a fuel cell facility that can supply the power required by a fuel cell system having a fuel cell device that is not generating power.

FIG. 1 is a diagram showing the configuration of a fuel cell facility according to a first embodiment. FIG. 1 is a diagram showing the configuration of a fuel cell facility according to a first embodiment. FIG. 1 is a diagram showing the configuration of a fuel cell facility according to a first embodiment. It is a figure showing the composition of the fuel cell equipment of a 2nd embodiment. It is a figure showing the composition of the fuel cell equipment of a 2nd embodiment. It is a figure showing the composition of the fuel cell equipment of a 2nd embodiment. It is a figure showing the composition of the fuel cell equipment of a 3rd embodiment. It is a figure showing the composition of the fuel cell equipment of a 3rd embodiment. It is a figure showing the composition of the fuel cell equipment of a 3rd embodiment. It is a figure showing the composition of the fuel cell equipment of a 4th embodiment. It is a figure showing the composition of the fuel cell equipment of a 4th embodiment. It is a figure showing the composition of the fuel cell equipment of a 4th embodiment. It is a figure showing the composition of fuel cell equipment of a 5th embodiment. It is a figure showing the composition of fuel cell equipment of a 5th embodiment. It is a figure showing the composition of fuel cell equipment of a 5th embodiment.

<First embodiment>
EMBODIMENT OF THE INVENTION Below, the fuel cell equipment based on 1st Embodiment of this invention is demonstrated with reference to drawings.
1 to 3 are diagrams showing the configuration of the fuel cell equipment of the first embodiment. Specifically, FIG. 1 is a diagram showing the state in which the fuel cell device 11 is in grid-connected operation, FIG. 2 is a diagram showing the state immediately after a power outage in the power grid 1, and FIG. It is a figure which shows the state in self-sustaining operation. In FIGS. 1 to 3, each fuel cell system 10 corresponds to a facility such as, for example, each residential unit of an apartment complex or each tenant of a commercial building. Each fuel cell system 10 is configured to collectively receive power from the power grid 1 via one power receiving facility 2.

As illustrated, the power line L is composed of an internal power line 20 and an interconnecting power line 6, and is connected to the power system 1 via a power receiving equipment 2 having a circuit breaker 4. Interconnection power lines 6 that connect the plurality of fuel cell systems 10 to each other are connected to the power system 1 via the power receiving equipment 2. In this way, a fuel cell facility can be constructed in which the power line L to which a plurality of fuel cell systems 10 having the fuel cell device 11, the important power load device 21, and the general power load device 22 are connected is connected to the power system 1. . The shared power load device 7 is a device such as an electric light or a water pump installed in a common area of an apartment complex or a commercial building.
In addition, in the figure, the important power load device 21 is described as "important load," the general power load device 22 is described as "general load," and the shared power load device 7 is described as "shared load." It states: Important power load devices 21 are, for example, major lighting devices, computer devices, and the like. The general power load device 22 is a lighting device or the like that can be turned off during a power outage in the power system 1 . It should be noted that among the power loads installed in the fuel cell system 10, which power loads are to be designated as the important power load devices 21 and which power loads are to be designated as the general power load devices 22 can be set as appropriate.

[Power receiving equipment 2]
The operation of the circuit breaker 4 included in the power receiving equipment 2 is controlled by the control device 5 . For example, the power receiving equipment 2 includes a voltage detector 3 that measures the voltage of power supplied from the power system 1. The detection result of the voltage detector 3 is transmitted to the control device 5. When the voltage of the power in the power system 1 detected by the voltage detector 3 is lower than the set voltage, that is, when an abnormality such as a power outage occurs in the power system 1, the control device 5 activates the circuit breaker 4 of the power receiving equipment 2. Activate the cutoff. As a result, the interconnection power line 6 to which the plurality of fuel cell systems 10 and the shared power load device 7 are connected is disconnected from the power system 1. Thereafter, the control device 5 determines that when the voltage of the power in the power system 1 detected by the voltage detector 3 becomes equal to or higher than the set voltage, that is, the power supply from the power system 1 is normally performed. In this case, the circuit breaker 4 of the power receiving equipment 2 is connected and activated at an appropriate timing. As a result, the interconnection power line 6 to which the plurality of fuel cell systems 10 and the shared power loads 7 are connected is connected to the power grid 1 .

[Fuel cell system 10]
The fuel cell system 10 includes a fuel cell device 11 connected to an internal power line 20, an important power load device 21, and a general power load device 22. Internal power line 20 of each fuel cell system 10 is connected to interconnect power line 6 . In this embodiment, a first connection point P1, a second connection point P2, and a third connection point P3 are provided in the order of arrangement toward the downstream side when viewed from the connection point of the internal power line 20 to the interconnection power line 6, The fuel cell device 11 is connected to the first connection point P1, the terminal a of the switch 23 is connected to the second connection point P2, and the general power load device 22 is connected to the third connection point P3.

The fuel cell device 11 includes a fuel cell section 12 and a power conversion section 13 for converting the power generated by the fuel cell section 12 into power having a desired voltage, frequency, and phase and outputting the power. The fuel cell section 12 can be realized using, for example, a solid oxide fuel cell (SOFC). Alternatively, the fuel cell section 12 may be realized using another type of fuel cell such as a polymer electrolyte fuel cell (PEFC). In addition, the fuel cell device 11 includes auxiliary equipment 14 such as a blower for feeding fuel gas and oxygen into the fuel cell and a pump for circulating cooling water, and a battery control device for controlling the operation of the fuel cell device 11. 15. Although not shown, the fuel cell section 12 may include a fuel reformer or the like that generates hydrogen or the like as a fuel gas to be supplied to the anode of the fuel cell through a reforming process. Note that the auxiliary equipment 14 provided in the fuel cell device 11 is not limited to those described above, and various other devices are provided in the fuel cell device 11. A grid-connected output line 16 and an independent output line 17 are connected to the output end of the power converter 13. A grid-connected circuit breaker 18 is provided in the middle of the grid-connected output line 16, and a self-sustaining circuit breaker 19 is provided in the middle of the independent output line 17. The operation of the fuel cell section 12, the power conversion section 13, the auxiliary equipment 14, the grid-connected circuit breaker 18, and the independent circuit breaker 19 is controlled by the battery control section 15.

Furthermore, the battery control unit 15 transmits information to the control device 5 as to whether the fuel cell device 11 is in a power generation operation or has stopped power generation.

Important power load device 21 is connected to switch 23 . Specifically, the switch 23 has a terminal a connected to the internal power line 20, a terminal b connected to the independent output line 17, and a terminal c connected to the important power load device 21. Then, the switch 23 automatically changes the power supply source for the important power load device 21 to either the power supplied via the internal power line 20 or the power supplied via the independent output line 17. It works like switching. In the present embodiment, when power is being supplied to the terminal a connected to the independent output line 17, the switch 23 switches to a state in which terminals a and c are connected, and power is supplied to the terminal a. If not, terminal b and terminal c are switched to a connected state. In other words, when the battery control section 15 connects and operates the self-sustaining circuit breaker 19 and supplies the power generated by the fuel cell section 12 from the self-sustaining output line 17 to the terminal b of the switching device 23, the switching device 23 Terminal b and terminal c are connected, and the important power load device 21 is supplied with power generated by the fuel cell section 12. On the other hand, if the battery control section 15 does not operate the self-sustaining circuit breaker 19 to supply the power generated by the fuel cell section 12 from the self-sustaining output line 17 to the terminal b of the switching device 23, the switching device At 23, terminals a and c are connected, and power is supplied to the important power load device 21 from the internal power line 20.

During grid-connected operation, the fuel cell device 11 connects the grid-side circuit breaker 18 and operates the independent-side circuit breaker 19 to disconnect. However, power is not supplied to the independent output line 17 (that is, to terminal b of the switch 23). That is, during grid-connected operation, terminals a and c are connected in the switching device 23, and power is supplied to the important power load device 21 from the internal power line 20.
On the other hand, during self-sustaining operation, the fuel cell device 11 connects and operates both the grid-connected circuit breaker 18 and the self-sustaining circuit breaker 19. 16 and independent output line 17 are both powered. As a result, the power generated by the fuel cell device 11 is supplied to the internal power line 20 and also to the terminal b of the switch 23. That is, during standalone operation, terminals b and c are connected in the switching device 23, and the important power load device 21 of the same fuel cell system 10 is connected from the fuel cell device 11 performing power generation operation via the standalone output line 17. Electricity is supplied to the
In the fuel cell system 10 , if a surplus (surplus power) is generated in the power that the fuel cell device 11 supplies to the internal power line 20 , the surplus power is supplied to the interconnection power line 6 .

General power load device 22 is connected to internal power line 20 .

[During grid-connected operation]
FIG. 1 is a diagram showing a state in which the fuel cell device 11 is in grid-connected operation. In the figure, locations where power is supplied are drawn with thick lines.
When power is being supplied normally from the power system 1, the control device 5 connects the power system 1 and the power line L (interconnection power line 6) by connecting and operating the circuit breaker 4 of the power receiving equipment 2. do. When the power line L (interconnection power line 6) is connected to the power grid 1 by connecting and operating the circuit breaker 4 of the power receiving equipment 2 and is in interconnected operation, the fuel cell device 11 is not generating power. Even if there is a fuel cell system 10, the important power load device 21 and the general power load device 22 of the fuel cell system 10 operate using power supplied from the power line L (internal power line 20 and interconnection power line 6). can. In other words, in the case of grid-connected operation, the power line L is supplied with at least one of the power supplied from the power grid 1 and the power supplied from the fuel cell device 11 in power generation operation, so the power is used. Therefore, the important power load device 21 and the general power load device 22 of the fuel cell system 10 in which the fuel cell device 11 is in a state where power generation is stopped can operate. The shared power load device 7 can also operate by consuming power supplied via the interconnecting power line 6 .

However, if an abnormality such as a power outage occurs in the power system 1, the circuit breaker 4 of the power receiving equipment 2 is operated to disconnect the power line L (internal power line 20 and interconnection power line 6) from the power system 1. In that case, the power line L is supplied with only the electric power supplied from the fuel cell device 11 in the generating operation, but the amount of electric power is limited. Therefore, it is unclear whether all the power demands in the plurality of fuel cell systems 10 can be met only with the power supplied to the power line L from the fuel cell device 11 in power generation operation.

Therefore, in the fuel cell equipment of the present embodiment, during grid-connected operation in which the power line L is connected to the power grid 1, the total maximum generated power of the fuel cell devices 11 during power generation operation in the plurality of fuel cell systems 10 is , the total amount of power required to start the power generation operation of the fuel cell device 11 that is not generating power, and the maximum load power of the power load devices (important power load device 21 and general power load device 22) in the plurality of fuel cell systems 10. The fuel cell device 11 to perform power generation operation is determined so that the total power is equal to or greater than the sum of the maximum load power of the shared power load device 7. In other words, even if an abnormality such as a power outage occurs in the power system 1 and the power line L (internal power line 20 and interconnection power line 6) is disconnected from the power system 1, the power line L The number of fuel cell devices 11 in operation is controlled from the time they are in interconnected operation so that all the power demands in the plurality of fuel cell systems 10 can be covered by only the power supplied to the fuel cell systems 10 .

For example, the control device 5 receives from each of the plurality of fuel cell systems 10 information about the maximum generated power of the fuel cell device 11, information about the power required to start the power generation operation of the fuel cell device 11, information about the power load device ( Information such as the maximum load power of the important power load device 21 and the general power load device 22) is received and stored in the storage device 8. The power required to start the power generation operation of the fuel cell device 11 is the power consumption of the auxiliary machine 14 described above.
In addition, the control device 5 continuously receives information at a predetermined timing from each of the plurality of fuel cell systems 10 indicating whether the fuel cell device 11 is currently in power generation operation or has stopped power generation. and stored in the storage device 8.

For example, when the control device 5 receives information that the fuel cell device 11 that is currently in power generation operation is scheduled to stop power generation, the control device 5 may select the fuel cell device 11 that is currently in power generation operation but is scheduled to stop generating power. The sum of the maximum generated power of the fuel cell devices 11 in power generation operation and the amount of power required to start the power generation operation of the fuel cell devices 11 in power generation operation are The sum of the total power, the total maximum load power of the power load devices (important power load device 21 and general power load device 22) in the plurality of fuel cell systems 10, and the maximum load power of the shared power load device 7.'' Compare with. Then, the control device 5 determines the "total maximum generated power of the fuel cell devices 11 that are in power generation operation" while regarding the fuel cell devices 11 scheduled to stop generating power as "fuel cell devices 11 that are not generating power." , "The total amount of power required to start the power generation operation of the fuel cell device 11 that is not generating power, and the maximum load power of the power load devices (important power load device 21 and general power load device 22) in the plurality of fuel cell systems 10." and the maximum load power of the shared power load device 7, one or more of the fuel cell devices 11 that have stopped generating power are to be newly started generating operation. 11, and before the fuel cell device 11 scheduled to stop power generation actually stops generating power, a command to start power generation operation is sent to the fuel cell device 11 that has been decided to newly start power generation operation. do. Note that, after the fuel cell device 11 stops generating power, the control device 5 may transmit a power generation operation start command to the fuel cell device 11 that has been determined to start a new power generation operation.

It can be set as appropriate which fuel cell device 11, among the fuel cell devices 11 whose power generation is stopped, is to be determined by the control device 5 as the fuel cell device 11 to newly start power generation operation. For example, the control device 5 controls each fuel cell device 11 based on information continuously received from each fuel cell system 10 indicating whether the fuel cell device 11 is in power generation operation or has stopped power generation. 11, and the fuel cell device 11 with the shortest cumulative operating time can be determined with priority as the fuel cell device 11 to newly start power generation operation. Alternatively, the control device 5 may randomly determine the fuel cell device 11 to newly start power generation operation from among the fuel cell devices 11 that have stopped generating power.

In the case of grid-connected operation illustrated in FIG. 1, the fuel cell device 11A of the fuel cell system 10A is not generating power, the fuel cell device 11B of the fuel cell system 10B is in power generation operation, and the fuel cell device 11A of the fuel cell system 10C is The battery device 11C is in power generation operation. In this state, "the total of the maximum generated power of the fuel cell devices 11B and 11C that are in power generation operation" is equal to "the total amount of power required to start the power generation operation of the fuel cell device 11A that is not generating power, and The sum of the maximum load power of the power load devices (important power load device 21 and general power load device 22) in the system 10 and the maximum load power of the shared power load device 7 is greater than or equal to the sum of the maximum load power of the power load devices (important power load device 21 and general power load device 22) in the system 10.

[Immediately after power outage]
FIG. 2 is a diagram showing the state of the power system 1 immediately after a power outage. In the figure, locations where power is supplied are drawn with thick lines.
When the voltage of the power in the power system 1 detected by the voltage detector 3 is lower than the set voltage, that is, when an abnormality such as a power outage occurs in the power system 1, the control device 5 activates the circuit breaker 4 of the power receiving equipment 2. By activating the disconnection, the power line L (interconnecting power line 6) is disconnected from the power system 1, and a synchronization signal (for example, a 60 Hz signal) is sent to the fuel cell device 11. As a result, the fuel cell device 11 can perform stable power generation operation by outputting AC power in accordance with the motive signal. In addition, the control device 5 instructs each fuel cell system 10 to perform power generation operation (self-sustaining operation) of the fuel cell device 11 at a predetermined output (for example, maximum generated power, etc.).

In a fuel cell system 10 having a fuel cell device 11 that is already in power generation operation, the fuel cell device 11 is operated independently at the maximum generated power in response to an instruction from the control device 5. In this case, the fuel cell device 11 connects and operates both the interconnection-side circuit breaker 18 and the independent-side circuit breaker 19, so that the fuel cell device 11 that is performing power generation operation is connected to the interconnection output line 16 and the independent output line 17. Power is supplied to both. As a result, the power generated by the fuel cell device 11 is supplied to the internal power line 20 and also to the terminal b of the switch 23. That is, during standalone operation, terminals b and c are connected in the switching device 23, and the important power load device 21 of the same fuel cell system 10 is connected from the fuel cell device 11 performing power generation operation via the standalone output line 17. Electricity is supplied to the

When the fuel cell device 11 is operating at the maximum generated power and the maximum generated power is larger than the sum of the load power of the important power load device 21 and the load power of the general power load device 22, the surplus power is transferred to the interconnection power line 6. Supplied. Then, in the fuel cell system 10A having the fuel cell device 11A which is also connected to the interconnection power line 6 and whose power generation is stopped, the power is used to start the power generation operation of the fuel cell device 11 (i.e., the auxiliary equipment 14 load power) is used for the operation of the important power load device 21 and for the operation of the general power load device 22. Further, the power supplied from the fuel cell system 10 having the fuel cell device 11 in power generation operation to the interconnection power line 6 is also used for the operation of the shared power load device 7.

As described above, in the fuel cell equipment of the present embodiment, when an abnormality occurs in the power system 1, the power line L is disconnected from the power system 1 by the circuit breaker 4 of the power receiving equipment 2, and the fuel cell equipment during power generation operation is In the fuel cell system 10 having the battery device 11, power is supplied to the important power load device 21 and the general power load device 22, and power is supplied from at least one of the fuel cell systems 10 having the fuel cell device 11 in power generation operation. In a fuel cell system 10 having a fuel cell device 11 which is supplied with power to the power line L and whose power generation is stopped, the fuel cell device 11 starts power generation operation by consuming the power supplied from the power line L, In addition, in the fuel cell system 10 having the fuel cell device 11 in which power generation is stopped, the important power load device 21 and the general power load device 22 are configured to operate by consuming power supplied from the power line L.

[During independent operation]
FIG. 3 is a diagram showing a state in which the fuel cell device 11 is in self-sustaining operation. In the figure, locations where power is supplied are drawn with thick lines.
As shown in the figure, all the fuel cell systems 10, including the fuel cell device 11A of the fuel cell system 10A, which had stopped generating power immediately after the power outage, started generating power (self-sustaining operation). There is. In addition, since the fuel cell device 11A of the fuel cell system 10A, which had stopped generating power immediately after the power outage, connects and operates both the interconnection-side circuit breaker 18 and the independent-side circuit breaker 19, the power generated by the fuel cell device 11A is supplied to the internal power line 20 and also to the terminal b of the switch 23. In other words, in the fuel cell system 10A, after an abnormality occurs in the power system 1, terminals b and c are connected in the switching device 23, and important power is supplied from the fuel cell device 11A performing power generation operation (self-sustaining operation). Power is being supplied to the load device 21A.
As described above, even if power is not supplied from the power grid 1, the fuel cell device 11 of each fuel cell system 10 can provide sufficient power to the important power load device 21, the general power load device 22, and the shared power load device 7. power can be supplied.

<Second embodiment>
The fuel cell equipment of the second embodiment differs from the above embodiments in the destination of power supply immediately after a power outage and during self-sustaining operation. The fuel cell equipment of the second embodiment will be explained below, but the explanation of the same configuration as the above embodiment will be omitted.

4 to 6 are diagrams showing the configuration of the fuel cell equipment of the second embodiment. Specifically, FIG. 4 is a diagram showing the state in which the fuel cell device 11 is in grid-connected operation, FIG. 5 is a diagram showing the state immediately after a power outage in the power grid 1, and FIG. It is a figure which shows the state in self-sustaining operation. As shown in the figure, in the fuel cell equipment of the second embodiment, a circuit breaker 24 is provided in the middle of the internal power line 20 (L) of each fuel cell system 10. The circuit breaker 24 is provided between the second connection point P2 and the third connection point P3 of the internal power line 20. Therefore, the general power load device 22 can receive power when the circuit breaker 24 is connected, and cannot receive power when the circuit breaker 24 is disconnected. .

[During grid-connected operation]
FIG. 4 is a diagram showing a state in which the fuel cell device 11 is in grid-connected operation. In the figure, locations where power is supplied are drawn with thick lines.
When power is being supplied normally from the power system 1, the control device 5 connects the power system 1 and the power line L (interconnection power line 6) by connecting and operating the circuit breaker 4 of the power receiving equipment 2. do. Further, in each fuel cell system 10, the circuit breaker 24 is connected and operated. When the power line L (interconnection power line 6) is connected to the power grid 1 by connecting and operating the circuit breaker 4 of the power receiving equipment 2 and is in interconnected operation, the fuel cell device 11 is not generating power. Even if there is a fuel cell system 10, the important power load device 21 and the general power load device 22 of the fuel cell system 10 operate using power supplied from the power line L (internal power line 20 and interconnection power line 6). can. In other words, in the case of grid-connected operation, the power line L is supplied with at least one of the power supplied from the power grid 1 and the power supplied from the fuel cell device 11 in power generation operation, so the power is used. Therefore, the important power load device 21 and the general power load device 22 of the fuel cell system 10 in which the fuel cell device 11 is in a state where power generation is stopped can operate. The shared power load 7 can also operate using power supplied via the interconnect power line 6 .

In the fuel cell equipment of this embodiment, during grid-connected operation in which the power line L is connected to the power grid 1, in the plurality of fuel cell systems 10, the total of the maximum generated power of the fuel cell devices 11 in power generation operation is The sum of the power required to start the power generation operation of the stopped fuel cell device 11, the sum of the maximum load power of the important power load devices 21 in the plurality of fuel cell systems 10, and the maximum load power of the shared power load device 7. , the fuel cell device 11 to perform power generation operation is determined so that the sum is greater than or equal to the sum of . In other words, even if an abnormality such as a power outage occurs in the power system 1 and the power line L (internal power line 20 and interconnection power line 6) is disconnected from the power system 1, the power line L During grid-connected operation, the fuel is The number of battery devices 11 in operation is controlled.
In this manner, in this embodiment, the number of operating fuel cell devices 11 is controlled without considering the load power of the general power load device 22 of each fuel cell system 10.

For example, when the control device 5 receives information that the fuel cell device 11 that is currently in power generation operation is scheduled to stop power generation, the control device 5 may select the fuel cell device 11 that is currently in power generation operation but is scheduled to stop generating power. The sum of the maximum generated power of the fuel cell devices 11 in power generation operation and the amount of power required to start the power generation operation of the fuel cell devices 11 in power generation operation are The total power, the sum of the maximum load power of the important power load devices 21 in the plurality of fuel cell systems 10, and the maximum load power of the shared power load device 7'' are compared. Then, the control device 5 determines that the "total maximum generated power of the fuel cell devices 11 in power generation operation" is the sum of "the total amount of power required to start power generation operation of the fuel cell devices 11 in power generation halt" and If the sum of the maximum load power of the important power load devices 21 in the battery system 10 and the maximum load power of the shared power load device 7 is not reached, the fuel cell devices 11 that have stopped generating power will be newly generated. One or more fuel cell devices 11 to start operation are determined, and before the fuel cell device 11 that is scheduled to stop generating electricity actually stops generating electricity, the fuel that has been decided to start a new generating operation. A command to start power generation operation is transmitted to the battery device 11. Note that, after the fuel cell device 11 stops generating power, the control device 5 may transmit a power generation operation start command to the fuel cell device 11 that has been determined to start a new power generation operation.

In the case of grid-connected operation illustrated in FIG. 4, the fuel cell device 11A of the fuel cell system 10A is not generating power, the fuel cell device 11B of the fuel cell system 10B is in power generation operation, and the fuel cell device 11A of the fuel cell system 10C is The battery device 11C is in power generation operation. In this state, "the total of the maximum generated power of the fuel cell devices 11B and 11C that are in power generation operation" is equal to "the total amount of power required to start the power generation operation of the fuel cell device 11A that is not generating power, and The sum of the maximum load power of the important power load devices 21 and the maximum load power of the shared power load device 7 in the system 10 is greater than or equal to the sum of the maximum load power of the important power load devices 21 in the system 10 and the maximum load power of the shared power load devices 7.

[Immediately after power outage]
FIG. 5 is a diagram showing the state of the power system 1 immediately after a power outage. In the figure, locations where power is supplied are drawn with thick lines.
When the voltage of the power in the power system 1 detected by the voltage detector 3 is lower than the set voltage, that is, when an abnormality such as a power outage occurs in the power system 1, the control device 5 activates the circuit breaker 4 of the power receiving equipment 2. By activating the disconnection, the power line L (interconnecting power line 6) is disconnected from the power system 1, and a synchronization signal (for example, a 60 Hz signal) is sent to the fuel cell device 11. In addition, the control device 5 instructs each fuel cell system 10 to perform power generation operation (self-sustaining operation) of the fuel cell device 11 at a predetermined output (for example, maximum generated power, etc.).

In each fuel cell system 10, the circuit breaker 24 is operated to break, for example, in response to a command from the battery control section 15 of the fuel cell section 12. As a result, the general power load device 22 included in each fuel cell system 10 cannot receive power supply.

In a fuel cell system 10 that includes a fuel cell device 11 that is already in power generation operation, the fuel cell device 11 is operated independently at the maximum generated power in response to an instruction from the control device 5. In this case, the fuel cell device 11 connects and operates both the grid-connected circuit breaker 18 and the self-sustaining circuit breaker 19, so that the fuel cell device 11 that is performing power generation operation is connected to the grid-connected output line 16 and the self-sustaining output line 17. Power is supplied to both. As a result, the power generated by the fuel cell device 11 is supplied to the internal power line 20 and also to the terminal b of the switch 23. That is, during autonomous operation, terminals b and c are connected in the switching device 23, and the important power load device 21 of the same fuel cell system 10 is connected from the fuel cell device 11 performing power generation operation via the autonomous output line 17. Electricity is supplied to the

When the fuel cell device 11 is operating at maximum generated power, surplus power is supplied to the interconnecting power line 6. Then, in the fuel cell system 10A having the fuel cell device 11A which is also connected to the interconnection power line 6 and whose power generation is stopped, the power is used to start the power generation operation of the fuel cell device 11A (i.e., the auxiliary equipment 14 load power) is used for the operation of the important power load device 21A. Further, the power supplied from the fuel cell system 10 having the fuel cell device 11 in power generation operation to the interconnection power line 6 is also used for the operation of the shared power load device 7.

As described above, in the fuel cell equipment of the present embodiment, when an abnormality occurs in the power system 1, the power line L is disconnected from the power system 1 by the circuit breaker 4 of the power receiving equipment 2, and the fuel cell equipment during power generation operation is In the fuel cell system 10 having the battery device 11, power is supplied to the important power load device 21, and power is supplied to the power line L from at least one of the fuel cell systems 10 having the fuel cell device 11 in power generation operation. In a fuel cell system 10 having a fuel cell device 11 that is being supplied and is not generating power, the fuel cell device 11 starts power generation operation by consuming the power supplied from the power line L, and when the power generation is stopped. The fuel cell system 10 having the fuel cell device 11 is configured so that the important power load device 21 can operate by consuming power supplied from the power line L.

[During independent operation]
FIG. 6 is a diagram showing a state in which the fuel cell device 11 is in self-sustaining operation. In the figure, locations where power is supplied are drawn with thick lines.
As shown in the figure, all the fuel cell systems 10, including the fuel cell device 11A of the fuel cell system 10A, which had stopped generating power immediately after the power outage, started generating power (self-sustaining operation). There is.
In addition, since the fuel cell device 11A of the fuel cell system 10A, which had stopped generating power immediately after the power outage, connects and operates both the interconnection-side circuit breaker 18 and the independent-side circuit breaker 19, the power generated by the fuel cell device 11A is supplied to the internal power line 20 and also to the terminal b of the switch 23. In other words, in the fuel cell system 10A, after an abnormality occurs in the power system 1, terminals b and c are connected in the switching device 23, and important power is supplied from the fuel cell device 11A performing power generation operation (self-sustaining operation). Power is being supplied to the load device 21A.
As a result, even if power is not supplied from the power grid 1, sufficient power can be supplied from the fuel cell device 11 of each fuel cell system 10 to the important power load device 21 and the shared power load device 7.

<Third embodiment>
The fuel cell equipment of the third embodiment differs from the above embodiments in the destination of power supply immediately after a power outage and during self-sustaining operation. A fuel cell facility according to a third embodiment will be described below, but a description of structures similar to those of the above embodiment will be omitted.

7 to 9 are diagrams showing the configuration of the fuel cell equipment of the third embodiment. Specifically, FIG. 7 is a diagram showing the state in which the fuel cell device 11 is in grid-connected operation, FIG. 8 is a diagram showing the state immediately after a power outage in the power system 1, and FIG. It is a figure which shows the state in self-sustaining operation. As shown in the figure, in the fuel cell equipment of the third embodiment, a circuit breaker 25 is provided in the middle of the interconnecting power line 6 (L). The circuit breaker 25 connects or disconnects the shared power load device 7 to the interconnecting power line 6 . Therefore, the shared power load device 7 can receive power when the circuit breaker 25 is connected, and cannot receive power when the circuit breaker 25 is disconnected. .

[During grid-connected operation]
FIG. 7 is a diagram showing a state in which the fuel cell device 11 is in grid-connected operation. In the figure, locations where power is supplied are drawn with thick lines.
When power is being supplied normally from the power system 1, the control device 5 connects the power system 1 and the power line L (interconnection power line 6) by connecting and operating the circuit breaker 4 of the power receiving equipment 2. , the circuit breaker 25 is connected and operated. Further, in each fuel cell system 10, the circuit breaker 24 is connected and operated. When the power line L (interconnection power line 6) is connected to the power grid 1 by connecting and operating the circuit breaker 4 of the power receiving equipment 2 and is in interconnected operation, the fuel cell device 11 is not generating power. Even if there is a fuel cell system 10, the important power load device 21 and the general power load device 22 of the fuel cell system 10 operate using power supplied from the power line L (internal power line 20 and interconnection power line 6). can. In other words, in the case of grid-connected operation, the power line L is supplied with at least one of the power supplied from the power grid 1 and the power supplied from the fuel cell device 11 in power generation operation, so the power is used. Therefore, the important power load device 21 and the general power load device 22 of the fuel cell system 10, in which the fuel cell device 11 is in a state where power generation is stopped, can operate. The shared power load 7 can also operate using power supplied via the interconnect power line 6 .

In the fuel cell equipment of this embodiment, during grid-connected operation in which the power line L is connected to the power grid 1, in the plurality of fuel cell systems 10, the total of the maximum generated power of the fuel cell devices 11 in power generation operation is The power generation operation is performed so that the total amount of power required to start the power generation operation of the stopped fuel cell devices 11 is greater than or equal to the sum of the maximum load power of the important power load devices 21 in the plurality of fuel cell systems 10. The fuel cell device 11 that will be used is determined. In other words, even if an abnormality such as a power outage occurs in the power system 1 and the power line L (internal power line 20 and interconnection power line 6) is disconnected from the power system 1, the power line L so that all the power demands in the plurality of fuel cell systems 10 (excluding the power demand of the general power load device 22 and the power demand of the shared power load device 7) can be covered only by the power supplied to the fuel cell system 10. The number of operating fuel cell devices 11 is controlled from the time that the fuel cell devices 11 are in interconnected operation.
In this manner, in this embodiment, the number of operating fuel cell devices 11 is controlled without considering the load power of the general power load device 22 and the load power of the shared power load device 7 of each fuel cell system 10.

For example, when the control device 5 receives information that the fuel cell device 11 that is currently in power generation operation is scheduled to stop power generation, the control device 5 may select the fuel cell device 11 that is currently in power generation operation but is scheduled to stop generating power. The sum of the maximum generated power of the fuel cell devices 11 in power generation operation and the amount of power required to start the power generation operation of the fuel cell devices 11 in power generation operation are The sum of the total power and the sum of the maximum load power of the important power load devices 21 in the plurality of fuel cell systems 10 are compared. Then, the control device 5 determines that the "total maximum generated power of the fuel cell devices 11 in power generation operation" is the sum of "the total amount of power required to start power generation operation of the fuel cell devices 11 in power generation halt" and If the sum of the maximum load power of the important power load devices 21 in the battery system 10 is less than the sum of Before the fuel cell device 11 scheduled to stop power generation actually stops generating power, a command to start power generation operation is issued to the fuel cell device 11 that has been decided to start a new power generation operation. Send. Note that, after the fuel cell device 11 stops generating power, the control device 5 may transmit a power generation operation start command to the fuel cell device 11 that has been determined to start a new power generation operation.

In the case of grid-connected operation illustrated in FIG. 7, the fuel cell device 11A of the fuel cell system 10A is not generating power, the fuel cell device 11B of the fuel cell system 10B is in power generation operation, and the fuel cell device 11B of the fuel cell system 10C is The battery device 11C is in power generation operation. In this state, "the total of the maximum generated power of the fuel cell devices 11B and 11C that are in power generation operation" is equal to "the total amount of power required to start the power generation operation of the fuel cell device 11A that is not generating power, and and the sum of the maximum load powers of the important power load devices 21 in the system 10.

[Immediately after power outage]
FIG. 8 is a diagram showing the state of the power system 1 immediately after a power outage. In the figure, locations where power is supplied are drawn with thick lines.
When the voltage of the power in the power system 1 detected by the voltage detector 3 is lower than the set voltage, that is, when an abnormality such as a power outage occurs in the power system 1, the control device 5 activates the circuit breaker 4 of the power receiving equipment 2. By operating the circuit breaker 25, the power line L (interconnecting power line 6) is disconnected from the power system 1, and by operating the circuit breaker 25, the shared power load device 7 is disconnected from the interconnecting power line 6, and the fuel cell device A synchronizing signal (for example, a 60 Hz signal) is sent to 11. In addition, the control device 5 instructs each fuel cell system 10 to perform power generation operation (self-sustaining operation) of the fuel cell device 11 at a predetermined output (for example, maximum generated power, etc.).

In each fuel cell system 10, the circuit breaker 24 is operated to break, for example, in response to a command from the battery control section 15 of the fuel cell section 12. As a result, the general power load device 22 included in each fuel cell system 10 cannot receive power supply.

In a fuel cell system 10 having a fuel cell device 11 that is already in power generation operation, the fuel cell device 11 is operated independently at the maximum generated power in response to an instruction from the control device 5. In this case, the fuel cell device 11 connects and operates both the interconnection-side circuit breaker 18 and the independent-side circuit breaker 19, so that the fuel cell device 11 that is performing power generation operation is connected to the interconnection output line 16 and the independent output line 17. Power is supplied to both. As a result, the power generated by the fuel cell device 11 is supplied to the internal power line 20 and also to the terminal b of the switch 23. That is, during standalone operation, terminals b and c are connected in the switching device 23, and the important power load device 21 of the same fuel cell system 10 is connected from the fuel cell device 11 performing power generation operation via the standalone output line 17. Electricity is supplied to the

When the fuel cell device 11 is operating at maximum generated power, surplus power is supplied to the interconnecting power line 6. Then, in the fuel cell system 10A having the fuel cell device 11A which is also connected to the interconnection power line 6 and whose power generation is stopped, the power is used to start the power generation operation of the fuel cell device 11A (i.e., the auxiliary equipment 14 load power) is used for the operation of the important power load device 21A. Note that since the circuit breaker 25 is in a cutoff operation, power is not supplied to the shared power load device 7.

As described above, in the fuel cell equipment of the present embodiment, when an abnormality occurs in the power system 1, the power line L is disconnected from the power system 1 by the circuit breaker 4 of the power receiving equipment 2, and the fuel cell equipment during power generation operation is In the fuel cell system 10 having the battery device 11, power is supplied to the important power load device 21, and power is supplied to the power line L from at least one of the fuel cell systems 10 having the fuel cell device 11 in power generation operation. In a fuel cell system 10 having a fuel cell device 11 which is being supplied and whose power generation is stopped, the fuel cell device 11 starts power generation operation by consuming the power supplied from the power line L, and the fuel cell device 11 which is stopped generating power The fuel cell system 10 having the device 11 is configured so that the important power load device 21 can operate by consuming power supplied from the power line L.

[During independent operation]
FIG. 9 is a diagram showing a state in which the fuel cell device 11 is in self-sustaining operation. In the figure, locations where power is supplied are drawn with thick lines.
As shown in the figure, all the fuel cell systems 10, including the fuel cell device 11A of the fuel cell system 10A, which had stopped generating power immediately after the power outage, started generating power (self-sustaining operation). There is.
In addition, since the fuel cell device 11A of the fuel cell system 10A, which had stopped generating power immediately after the power outage, connects and operates both the interconnection-side circuit breaker 18 and the independent-side circuit breaker 19, the power generated by the fuel cell device 11A is supplied to the internal power line 20 and also to the terminal b of the switch 23. In other words, in the fuel cell system 10A, after an abnormality occurs in the power system 1, terminals b and c are connected in the switching device 23, and important power is supplied from the fuel cell device 11A performing power generation operation (self-sustaining operation). Power is being supplied to the load device 21A.
As a result, even if power is not supplied from the power grid 1, sufficient power can be supplied from the fuel cell device 11 of each fuel cell system 10 to the important power load device 21.

<Fourth embodiment>
The fuel cell equipment of the fourth embodiment is different from the above embodiments in terms of the destination to which power is supplied immediately after a power outage and during self-sustaining operation. The fuel cell equipment of the fourth embodiment will be explained below, but the explanation of the same configuration as the above embodiment will be omitted.

10 to 12 are diagrams showing the configuration of the fuel cell equipment of the fourth embodiment. Specifically, FIG. 10 is a diagram showing the state in which the fuel cell device 11 is in grid-connected operation, FIG. 11 is a diagram showing the state immediately after a power outage in the power grid 1, and FIG. It is a figure which shows the state in self-sustaining operation. As shown in the figure, in the fuel cell equipment of the fourth embodiment, a circuit breaker 26 is provided in the middle of the internal power line 20 (L) of each fuel cell system 10. The circuit breaker 26 is provided between the first connection point P1 and the second connection point P2 of the internal power line 20. Therefore, the general power load device 22 can receive power when the circuit breaker 26 is connected, and cannot receive power when the circuit breaker 26 is disconnected. . In addition, the important power load device 21 can receive power when the circuit breaker 26 is connected, and when the circuit breaker 26 is disconnected, the important power load device 21 is connected to the terminal b of the switching device 23. You can receive power only when power is being supplied.

[During grid-connected operation]
FIG. 10 is a diagram showing a state in which the fuel cell device 11 is in grid-connected operation. In the figure, locations where power is supplied are drawn with thick lines.
When power is being supplied normally from the power system 1, the control device 5 connects the power system 1 and the power line L (interconnection power line 6) by connecting and operating the circuit breaker 4 of the power receiving equipment 2. , the circuit breaker 25 is connected and operated. Further, in each fuel cell system 10, the circuit breaker 26 is connected and operated. When the power line L (interconnection power line 6) is connected to the power grid 1 by connecting and operating the circuit breaker 4 of the power receiving equipment 2 and is in interconnected operation, the fuel cell device 11 is not generating power. Even if there is a fuel cell system 10, the important power load device 21 and the general power load device 22 of the fuel cell system 10 operate using power supplied from the power line L (internal power line 20 and interconnection power line 6). can. In other words, in the case of grid-connected operation, the power line L is supplied with at least one of the power supplied from the power grid 1 and the power supplied from the fuel cell device 11 in power generation operation, so the power is used. Therefore, the important power load device 21 and the general power load device 22 of the fuel cell system 10 in which the fuel cell device 11 is in a state where power generation is stopped can operate. The shared power load 7 can also operate using power supplied via the interconnect power line 6 .

In the fuel cell equipment of this embodiment, during grid-connected operation in which the power line L is connected to the power grid 1, in the plurality of fuel cell systems 10, the total of the maximum generated power of the fuel cell devices 11 in power generation operation is The sum of the total power required to start power generation operation of the stopped fuel cell device 11 and the total maximum load power of the important power load devices 21 in the fuel cell system 10 having the fuel cell device 11 in power generation operation. As described above, the fuel cell device 11 to perform power generation operation is determined. In other words, even if an abnormality such as a power outage occurs in the power system 1 and the power line L (internal power line 20 and interconnection power line 6) is disconnected from the power system 1, the power line L All the electric power demands in the plurality of fuel cell systems 10 are met by only the electric power supplied to the The number of fuel cell devices 11 in operation is controlled from the time they are in grid-connected operation so that the fuel cell system 10 (excluding the power demand of the important power load device 21) can be covered.
As described above, in this embodiment, the load power of the general power load device 22 of each fuel cell system 10, the load power of the shared power load device 7, and the fuel cell system 10 in which the fuel cell device 11 in which power generation is stopped are provided. The number of operating fuel cell devices 11 is controlled without considering the load power of the important power load device 21.

For example, when the control device 5 receives information that the fuel cell device 11 that is currently in power generation operation is scheduled to stop power generation, the control device 5 may select the fuel cell device 11 that is currently in power generation operation but is scheduled to stop generating power. The sum of the maximum generated power of the fuel cell devices 11 in power generation operation and the amount of power required to start the power generation operation of the fuel cell devices 11 in power generation operation are The total power and the sum of the maximum load power of the important power load devices 21 in the fuel cell system 10 having the fuel cell device 11 in power generation operation are compared. Then, the control device 5 determines that the "total maximum generated power of the fuel cell devices 11 in power generation operation" is equal to "the total amount of power required to start power generation operation of the fuel cell devices 11 in power generation operation and If the total of the maximum load power of the important power load devices 21 in the fuel cell system 10 having the fuel cell devices 11 of one or more fuel cell devices 11 to be restarted, and before the fuel cell device 11 scheduled to stop power generation actually stops generating power, the fuel cell device 11 that has been decided to newly start power generation operation. Sends a command to start power generation operation to Note that, after the fuel cell device 11 stops generating power, the control device 5 may transmit a power generation operation start command to the fuel cell device 11 that has been determined to start a new power generation operation.

In the case of grid-connected operation illustrated in FIG. 10, the fuel cell device 11A of the fuel cell system 10A is not generating power, the fuel cell device 11B of the fuel cell system 10B is in power generation operation, and the fuel cell device 11A of the fuel cell system 10C is The battery device 11C is in power generation operation. In this state, the "total of the maximum generated power of the fuel cell devices 11B and 11C in power generation operation" is equal to "the total amount of power required to start power generation operation of the fuel cell device 11A in power generation operation, and and the sum of the maximum load powers of the important power load devices 21 in the fuel cell systems 10B and 10C having the fuel cell devices 11B and 11C.

[Immediately after power outage]
FIG. 11 is a diagram showing the state of the power system 1 immediately after a power outage. In the figure, locations where power is supplied are drawn with thick lines.
When the voltage of the power in the power system 1 detected by the voltage detector 3 is lower than the set voltage, that is, when an abnormality such as a power outage occurs in the power system 1, the control device 5 activates the circuit breaker 4 of the power receiving equipment 2. By operating the circuit breaker 25, the power line L (interconnecting power line 6) is disconnected from the power system 1, and by operating the circuit breaker 25, the shared power load device 7 is disconnected from the interconnecting power line 6, and the fuel cell device A synchronizing signal (for example, a 60 Hz signal) is sent to 11. In addition, the control device 5 instructs each fuel cell system 10 to perform power generation operation (self-sustaining operation) of the fuel cell device 11 at a predetermined output (for example, maximum generated power, etc.).

In each fuel cell system 10, the circuit breaker 26 is operated to break, for example, in response to a command from the battery control section 15 of the fuel cell section 12. As a result, the general power load device 22 included in each fuel cell system 10 cannot receive power supply. Note that, as will be described later, in the fuel cell system 10 having the fuel cell device 11 in power generation operation (self-sustaining operation), power is supplied to the important power load device 21.

In a fuel cell system 10 having a fuel cell device 11 that is already in power generation operation, the fuel cell device 11 is operated independently at the maximum generated power in response to an instruction from the control device 5. In this case, the fuel cell device 11 connects and operates both the interconnection-side circuit breaker 18 and the independent-side circuit breaker 19, so that the fuel cell device 11 that is performing power generation operation is connected to the interconnection output line 16 and the independent output line 17. Power is supplied to both. As a result, the power generated by the fuel cell device 11 is supplied to the internal power line 20 and also to the terminal b of the switch 23. That is, during standalone operation, terminals b and c are connected in the switching device 23, and the important power load device 21 of the same fuel cell system 10 is connected from the fuel cell device 11 performing power generation operation via the standalone output line 17. Electricity is supplied to the

When the fuel cell device 11 is operating at maximum generated power, surplus power is supplied to the interconnecting power line 6. Then, in the fuel cell system 10A having the fuel cell device 11A which is also connected to the interconnection power line 6 and whose power generation is stopped, the power is used to start the power generation operation of the fuel cell device 11A (i.e., the auxiliary equipment 14 load power). Note that since the circuit breaker 25 is in a cutoff operation, power is not supplied to the shared power load device 7. In addition, in the fuel cell system 10A having the fuel cell device 11A in which power generation is stopped, the fuel cell device 11A operates the self-sustaining circuit breaker 19, so power is not supplied to the important power load device 21A of the fuel cell system 10A. It has not been.

As described above, in the fuel cell equipment of the present embodiment, when an abnormality occurs in the power system 1, the power line L is disconnected from the power system 1 by the circuit breaker 4 of the power receiving equipment 2, and the fuel cell equipment during power generation operation is In the fuel cell system 10 having the battery device 11, power is supplied to the important power load device 21, and power is supplied to the power line L from at least one of the fuel cell systems 10 having the fuel cell device 11 in power generation operation. In a fuel cell system 10 having a fuel cell device 11 which is supplied with power and whose power generation is stopped, the fuel cell device 11 is configured to consume power supplied from the power line L and start power generation operation.

[During independent operation]
FIG. 12 is a diagram showing a state in which the fuel cell device 11 is in self-sustaining operation. In the figure, locations where power is supplied are drawn with thick lines.
As shown in the figure, all the fuel cell systems 10, including the fuel cell device 11A of the fuel cell system 10A, which had stopped generating power immediately after the power outage, started generating power (self-sustaining operation). There is.
In addition, since the fuel cell device 11A of the fuel cell system 10A, which had stopped generating power immediately after the power outage, connects and operates both the interconnection-side circuit breaker 18 and the independent-side circuit breaker 19, the power generated by the fuel cell device 11A is supplied to the internal power line 20 and also to the terminal b of the switch 23. In other words, in the fuel cell system 10A, after an abnormality occurs in the power system 1, terminals b and c are connected in the switching device 23, and important power is supplied from the fuel cell device 11A performing power generation operation (self-sustaining operation). Power is being supplied to the load device 21A.
As a result, even if power is not supplied from the power grid 1, sufficient power can be supplied from the fuel cell device 11 of each fuel cell system 10 to the important power load device 21.

<Fifth embodiment>
The fuel cell equipment of the fifth embodiment differs from the above-described embodiments in the destination to which power is supplied immediately after a power outage and during self-sustaining operation. A fuel cell facility according to a fifth embodiment will be described below, but a description of the same configuration as the above embodiment will be omitted.

13 to 15 are diagrams showing the configuration of the fuel cell equipment of the fifth embodiment. Specifically, FIG. 13 is a diagram showing the state in which the fuel cell device 11 is in grid-connected operation, FIG. 14 is a diagram showing the state immediately after a power outage in the power grid 1, and FIG. It is a figure which shows the state in self-sustaining operation. As shown in the figure, in the fuel cell equipment of the fifth embodiment, a circuit breaker 26 is provided in the middle of the internal power line 20 (L) of each fuel cell system 10. The circuit breaker 26 is provided between the first connection point P1 and the second connection point P2 of the internal power line 20. The general power load device 22 can receive power when the circuit breaker 26 is connected, and cannot receive power when the circuit breaker 26 is disconnected. . In addition, the important power load device 21 can receive power when the circuit breaker 26 is connected, and when the circuit breaker 26 is disconnected, the important power load device 21 is connected to the terminal b of the switching device 23. You can receive power only when power is being supplied.

Further, the internal power line 20 (L) of each fuel cell system 10 is connected to the interconnection power line 6 (L) via a circuit breaker 27 . Therefore, each fuel cell system 10 is connected to the interconnecting power line 6 when the circuit breaker 27 is activated, and is not connected to the interconnecting power line 6 when the circuit breaker 27 is activated. The operation of the circuit breaker 27 is controlled by the control device 5.

[During grid-connected operation]
FIG. 13 is a diagram showing a state in which the fuel cell device 11 is in grid-connected operation. In the figure, locations where power is supplied are drawn with thick lines.
When power is being supplied normally from the power system 1, the control device 5 connects the power system 1 and the power line L (interconnection power line 6) by connecting and operating the circuit breaker 4 of the power receiving equipment 2. , the circuit breaker 25 is connected and operated. Further, the control device 5 connects and operates all the circuit breakers 27. Further, in each fuel cell system 10, the circuit breaker 26 is connected and operated. When the power line L (interconnection power line 6) is connected to the power grid 1 by connecting and operating the circuit breaker 4 of the power receiving equipment 2 and is in interconnected operation, the fuel cell device 11 is not generating power. Even if there is a fuel cell system 10, the important power load device 21 and the general power load device 22 of the fuel cell system 10 operate using power supplied from the power line L (internal power line 20 and interconnection power line 6). can. In other words, in the case of grid-connected operation, the power line L is supplied with at least one of the power supplied from the power grid 1 and the power supplied from the fuel cell device 11 in power generation operation, so the power is used. Therefore, the important power load device 21 and the general power load device 22 of the fuel cell system 10 in which the fuel cell device 11 is in a state where power generation is stopped can operate. The shared power load 7 can also operate using power supplied via the interconnect power line 6 .

In the fuel cell equipment of this embodiment, during grid-connected operation in which the power line L is connected to the power grid 1, in the plurality of fuel cell systems 10, the total of the maximum generated power of the fuel cell devices 11 in power generation operation is The total amount of power required to start the power generation operation of the fuel cell device 11 with the highest startup priority among the stopped fuel cell devices 11, and the total amount of power required for the fuel cell system 10 having the fuel cell device 11 in the power generation operation. The fuel cell device 11 to be operated to generate electricity is determined so that the total maximum load power of the important power load devices 21 is greater than or equal to the sum of the maximum load power of the important power load devices 21.

For example, in the example shown in FIG. 13, the fuel cell devices 11A of the fuel cell system 10A and the fuel cell device 11C of the fuel cell system 10C are in the process of stopping power generation. The priority of the starting order is that the fuel cell device 11A of the fuel cell system 10A has a high priority, and the fuel cell device 11C of the fuel cell system 10C has a low priority. Therefore, in the fuel cell equipment of this embodiment, during grid-connected operation in which the power line L is connected to the power grid 1, in the plurality of fuel cell systems 10, the total maximum generated power of the fuel cell devices 11B during the power generation operation is , the total power required to start the power generation operation of the fuel cell device 11 (fuel cell device 11 of the fuel cell system 10A) that has the highest startup priority among the fuel cell devices 11A and 11C that are not generating power; The fuel cell devices 11 to be operated to generate electricity are determined so that the sum is greater than or equal to the sum of the maximum load power of the important power load devices 21B in the fuel cell system 10B having the fuel cell devices 11B in operation to generate electricity.

In other words, even if an abnormality such as a power outage occurs in the power system 1 and the power line L (internal power line 20 and interconnection power line 6) is disconnected from the power system 1, the power line L The total amount of power required to start the power generation operation of the fuel cell device 11 (fuel cell device 11A of the fuel cell system 10A) with the highest priority in the startup order, and only the power supplied to the fuel cell that is in power generation operation. The number of fuel cell devices 11 in operation is controlled from the time they are in interconnected operation so that the power demand of the important power load devices 21 in the fuel cell system 10 including the devices 11 can be met.

For example, when the control device 5 receives information that the fuel cell device 11 that is currently in power generation operation is scheduled to stop power generation, the control device 5 may select the fuel cell device 11 that is currently in power generation operation but is scheduled to stop generating power. ``The total maximum generated power of the fuel cell apparatuses 11 that are in power generation operation'' and the ``priority of the startup order of the fuel cell apparatuses 11 that are in the stopped state of power generation.'' The sum of the total power required to start power generation operation of the fuel cell device 11 with the highest value and the total maximum load power of the important power load devices 21 in the fuel cell system 10 having the fuel cell device 11 in power generation operation. ”. Then, the control device 5 determines that the "total maximum generated power of the fuel cell devices 11 in power generation operation" is "the sum of the maximum generated power of the fuel cell devices 11 in power generation operation" and the "total of maximum generated power of the fuel cell devices 11 in power generation operation". If the sum of the total power required to start power generation operation and the maximum load power of important power load devices 21 in the fuel cell system 10 having the fuel cell device 11 in power generation operation is not reached, power generation will be stopped. Among the fuel cell devices 11 inside, one or more fuel cell devices 11 to newly start power generation operation are determined, and before the fuel cell devices 11 scheduled to stop generating power actually stop generating power, A power generation operation start command is transmitted to the fuel cell device 11 that has been decided to start a new power generation operation. Note that, after the fuel cell device 11 stops generating power, the control device 5 may transmit a power generation operation start command to the fuel cell device 11 that has been determined to start a new power generation operation.

In the case of grid-connected operation illustrated in FIG. 13, the fuel cell device 11A of the fuel cell system 10A is not generating power, the fuel cell device 11B of the fuel cell system 10B is in power generation operation, and the fuel cell device 11A of the fuel cell system 10C is The battery device 11C is not generating power. In this state, the "sum total of maximum generated power of the fuel cell devices 11B in power generation operation" is changed to "power generation of the fuel cell device 11A with the highest startup priority among the fuel cell devices 11A and 11C that are not generating power." The sum of the total power required to start operation and the maximum load power of the important power load devices 21B in the fuel cell system 10B having the fuel cell device 11B in power generation operation is greater than or equal to the sum of the total power required to start operation.

[Immediately after power outage]
FIG. 14 is a diagram showing the state of the power system 1 immediately after a power outage. In the figure, locations where power is supplied are drawn with thick lines.
When the voltage of the power in the power system 1 detected by the voltage detector 3 is lower than the set voltage, that is, when an abnormality such as a power outage occurs in the power system 1, the control device 5 activates the circuit breaker 4 of the power receiving equipment 2. By operating the circuit breaker 25, the power line L (interconnecting power line 6) is disconnected from the power system 1, and by operating the circuit breaker 25, the shared power load device 7 is disconnected from the interconnecting power line 6, and the fuel cell device A synchronizing signal (for example, a 60 Hz signal) is sent to 11.

The control device 5 connects and operates the circuit breaker 27b so that the internal power line 20 of the fuel cell system 10B having the fuel cell device 11B in power generation operation is connected to the interconnection power line 6, and also connects and operates the circuit breaker 27b for the fuel cell system 10B. Then, the fuel cell device 11B is instructed to perform power generation operation (self-sustaining operation) at a predetermined output (for example, maximum generated power, etc.).

Furthermore, the control device 5 connects and operates the circuit breaker 27a so that the fuel cell device 11A, which has the highest priority in the startup order, can start power generation operation among the fuel cell devices 11A and 11C that are in the stopped state of power generation. , the internal power line 20 of the fuel cell system 10A in which the fuel cell device 11A is provided is connected to the interconnection power line 6. As a result, power is supplied to the internal power line 20 of the fuel cell system 10A.
In contrast, the control device 5 operates to cut off the circuit breaker 27c of the fuel cell system 10C in which the fuel cell device 11C, which has a lower priority in the startup order, is installed among the fuel cell devices 11A and 11C that are in the process of stopping power generation. , disconnecting the internal power line 20 of the fuel cell system 10C from the interconnecting power line 6. As a result, no power is supplied to the internal power line 20 of the fuel cell system 10C.

In the fuel cell system 10 to which electric power is supplied when the circuit breaker 27 is connected and activated, the circuit breaker 26 is disconnected by a command from the battery control section 15 of the fuel cell section 12, for example. As a result, the general power load device 22 included in the fuel cell system 10 to which power is being supplied is no longer able to receive power. Note that, as will be described later, in the fuel cell system 10 having the fuel cell device 11 in power generation operation (self-sustaining operation), power is supplied to the important power load device 21.
In addition, in the fuel cell system 10 where power is not supplied due to the circuit breaker 27 being cut off, power is not supplied to any of the fuel cell device 11, the important power load device 21, and the general power load device 22. .

In a fuel cell system 10 having a fuel cell device 11 that is already in power generation operation, the fuel cell device 11 is operated independently at the maximum generated power in response to an instruction from the control device 5. In this case, the fuel cell device 11 connects and operates both the interconnection-side circuit breaker 18 and the independent-side circuit breaker 19, so that the fuel cell device 11 that is performing power generation operation is connected to the interconnection output line 16 and the independent output line 17. Power is supplied to both. As a result, the power generated by the fuel cell device 11 is supplied to the internal power line 20 and also to the terminal b of the switch 23. That is, during standalone operation, terminals b and c are connected in the switching device 23, and the important power load device 21 of the same fuel cell system 10 is connected from the fuel cell device 11 performing power generation operation via the standalone output line 17. Electricity is supplied to the

While the fuel cell device 11B is operating at maximum generated power, surplus power is supplied to the interconnection power line 6 via the circuit breaker 27. Then, in the fuel cell system 10A having the fuel cell device 11A which is also connected to the interconnection power line 6 and whose power generation is stopped, the power is used to start the power generation operation of the fuel cell device 11A (i.e., the auxiliary equipment 14 load power). Note that since the circuit breaker 25 is in a cutoff operation, power is not supplied to the shared power load device 7. In addition, in the fuel cell system 10A having the fuel cell device 11A in which power generation is stopped, the fuel cell device 11A operates the self-sustaining circuit breaker 19, so power is not supplied to the important power load device 21A of the fuel cell system 10A. It has not been.

[During independent operation]
FIG. 15 is a diagram showing a state in which the fuel cell device 11 is in self-sustaining operation. In the figure, locations where power is supplied are drawn with thick lines.
As shown in the figure, the fuel cell device 11A of the fuel cell system 10A, which had stopped generating power immediately after the power outage, is now in power generating operation (self-sustaining operation). Note that the fuel cell device 11C, which has a low priority in the startup order, is not performing power generation operation.

In addition, since the fuel cell device 11A of the fuel cell system 10A, which had stopped generating power immediately after the power outage, connects and operates both the interconnection-side circuit breaker 18 and the independent-side circuit breaker 19, the power generated by the fuel cell device 11A is supplied to the internal power line 20 and also to the terminal b of the switch 23. In other words, in the fuel cell system 10A, after an abnormality occurs in the power system 1, terminals b and c are connected in the switching device 23, and important power is supplied from the fuel cell device 11A performing power generation operation (self-sustaining operation). Power is being supplied to the load device 21A.

Thereafter, the control device 5 connects and operates the circuit breaker 27c so that the fuel cell device 11C having a lower priority in the startup order can start power generation operation, and the control device 5 connects and operates the circuit breaker 27c of the fuel cell system 10C provided with the fuel cell device 11C. The internal power line 20 and the interconnect power line 6 are connected. As a result, power is supplied to the internal power line 20 of the fuel cell system 10C. Although not shown, the fuel cell device 11C of the fuel cell system 10C also starts power generation operation thereafter.

As described above, in the fuel cell equipment of the present embodiment, when an abnormality occurs in the power system 1, the power line L is disconnected from the power system 1 by the circuit breaker 4 of the power receiving equipment 2, and the fuel cell equipment during power generation operation is In the fuel cell system 10 having the battery device 11, power is supplied to the important power load device 21, and power is supplied to the power line L from at least one of the fuel cell systems 10 having the fuel cell device 11 in power generation operation. Among the fuel cell devices 11 that are being supplied and are not generating power, power is supplied from the power line L to the fuel cell system 10 having the fuel cell device 11 in order of starting priority. Then, the fuel cell device 11 is configured to start power generation operation.

<Another embodiment>
<1>
In the above embodiment, the fuel cell equipment of the present invention has been described using a specific example, but its configuration can be changed as appropriate.

<2>
The configurations disclosed in the above embodiments (including other embodiments) can be applied in combination with the configurations disclosed in other embodiments as long as there is no contradiction, and the configurations disclosed in this specification can also be applied in combination with configurations disclosed in other embodiments. The embodiments described above are illustrative, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the purpose of the present invention.

INDUSTRIAL APPLICATION This invention can be utilized for the fuel cell equipment which can supply the electric power required by the fuel cell system which has a fuel cell apparatus in which power generation is stopped.

1 Power system 2 Power receiving equipment 4 Circuit breaker 6 Interconnecting power line (power line L)
7 Shared power load device 10 (10A, 10B, 10C) Fuel cell system 11 (11A, 11B, 11C) Fuel cell device 16 Grid-connected output line 17 Independent output line 20 Internal power line (power line L)
21 Important power load device (power load device)
22 General power load device (power load device)

Claims (6)

A fuel cell facility in which a power line to which a plurality of fuel cell systems each having a fuel cell device and a power load device are connected is connected to a power system via a power receiving facility having a circuit breaker,
A shared power load device is connected to the power line,
During interconnected operation in which the power line is connected to the power grid, in the plurality of fuel cell systems, the sum of the maximum generated power of the fuel cell devices in power generation operation is equal to the power generated by the fuel cell devices in power generation stop mode. Generate power so that the total amount of power required to start operation is greater than or equal to the sum of the total power load of the power load devices in the plurality of fuel cell systems, and the maximum load power of the shared power load device. determining the fuel cell device to operate;
When an abnormality occurs in the power system, the power line is disconnected from the power system by the circuit breaker of the power receiving equipment, and in the fuel cell system having the fuel cell device in power generation operation, the power load device and at least one of the fuel cell systems having the fuel cell device in power generation operation is supplied with power to the power line, and the fuel cell device is stopped in power generation. In the fuel cell system having the fuel cell system, the fuel cell device starts power generation operation by consuming power supplied from the power line, and in the fuel cell system having the fuel cell device in which power generation is stopped, power is supplied from the power line. The fuel cell equipment is configured such that the power load device can operate by consuming power supplied from the power line, and the shared power load device can operate by consuming power supplied from the power line. A fuel cell facility in which a power line to which a plurality of fuel cell systems each having a fuel cell device and a power load device are connected is connected to a power system via a power receiving facility having a circuit breaker,
A shared power load device is connected to the power line,
The power load device includes an important power load device and a general power load device,
During interconnected operation in which the power line is connected to the power grid, in the plurality of fuel cell systems, the sum of the maximum generated power of the fuel cell devices in power generation operation is equal to the power generated by the fuel cell devices in power generation stop mode. so that it is greater than or equal to the sum of the total power required to start operation, the total maximum load power of the important power load devices in the plurality of fuel cell systems, and the maximum load power of the shared power load device, determining the fuel cell device to perform power generation operation;
When an abnormality occurs in the power system, the power line is disconnected from the power system by the circuit breaker of the power receiving equipment, and in the fuel cell system having the fuel cell device in power generation operation, the important power load is At least one of the fuel cell systems including the fuel cell device is supplied with power to the device, and the fuel cell device is in power generation operation, and power is supplied to the power line, and the fuel cell is stopped in power generation. In the fuel cell system having the device, the fuel cell device starts power generation operation by consuming power supplied from the power line, and in the fuel cell system having the fuel cell device in which power generation is stopped, power is supplied from the power line. A fuel cell facility configured such that the important power load device can operate by consuming the power supplied, and the shared power load device can operate by consuming the power supplied from the power line. A fuel cell facility in which a power line to which a plurality of fuel cell systems each having a fuel cell device and a power load device are connected is connected to a power system via a power receiving facility having a circuit breaker,
The power load device includes an important power load device and a general power load device,
During interconnected operation in which the power line is connected to the power grid, in the plurality of fuel cell systems, the sum of the maximum generated power of the fuel cell devices in power generation operation is equal to the power generated by the fuel cell devices in power generation stop mode. determining the fuel cell device to be operated to generate electricity so that the total amount of power required to start operation is greater than or equal to the sum of the maximum load power of the important power load devices in the plurality of fuel cell systems;
When an abnormality occurs in the power system, the power line is disconnected from the power system by the circuit breaker of the power receiving equipment, and in the fuel cell system having the fuel cell device in power generation operation, the important power load is Electric power is supplied to the device, and power is supplied to the power line from at least one of the fuel cell systems having the fuel cell device that is in power generation operation, and the fuel cell device that is not generating power is supplied with power to the power line. In the fuel cell system having the fuel cell system, the fuel cell device starts power generation operation by consuming power supplied from the power line, and in the fuel cell system having the fuel cell device in which power generation is stopped, the power supplied from the power line is consumed. A fuel cell facility configured to allow the important power load device to operate by consuming power. A fuel cell facility in which a power line to which a plurality of fuel cell systems each having a fuel cell device and a power load device are connected is connected to a power system via a power receiving facility having a circuit breaker,
The power load device includes an important power load device and a general power load device,
During interconnected operation in which the power line is connected to the power grid, in the plurality of fuel cell systems, the sum of the maximum generated power of the fuel cell devices in power generation operation is equal to the power generated by the fuel cell devices in power generation stop mode. The power generation operation is performed so that the sum of the total power required to start the operation and the sum of the maximum load power of the important power load devices in the fuel cell system having the fuel cell device that is in power generation operation is greater than or equal to the sum of the total power required to start the operation. determining the fuel cell device;
When an abnormality occurs in the power system, the power line is disconnected from the power system by the circuit breaker of the power receiving equipment, and in the fuel cell system having the fuel cell device in power generation operation, the important power load is Electric power is supplied to the device, and power is supplied to the power line from at least one of the fuel cell systems having the fuel cell device that is in power generation operation, and the fuel cell device that is not generating power is supplied with power to the power line. In the fuel cell system, the fuel cell equipment is configured such that the fuel cell device starts power generation operation by consuming power supplied from the power line. A fuel cell facility in which a power line to which a plurality of fuel cell systems each having a fuel cell device and a power load device are connected is connected to a power system via a power receiving facility having a circuit breaker,
The power load device includes an important power load device and a general power load device,
During interconnected operation in which the power line is connected to the power grid, in the plurality of fuel cell systems, the total of the maximum generated power of the fuel cell devices in power generation operation is greater than the total of the maximum generated power of the fuel cell devices in power generation operation. the total amount of power required to start power generation operation of the fuel cell device with the highest startup order priority, and the maximum load power of the important power load device in the fuel cell system having the fuel cell device in power generation operation. determining the fuel cell device to be operated to generate electricity so that the total is greater than or equal to the sum of;
When an abnormality occurs in the power system, the power line is disconnected from the power system by the circuit breaker of the power receiving equipment, and in the fuel cell system having the fuel cell device in power generation operation, the important power load is At least one of the fuel cell systems including the fuel cell device is supplied with power to the device, and the fuel cell device is in power generation operation, and power is supplied to the power line, and the fuel cell is stopped in power generation. Among the devices, power is supplied from the power line to the fuel cell system having the fuel cell device in descending order of startup priority, and the fuel cell device starts power generation operation. fuel cell equipment. The power load device includes an important power load device and a general power load device,
The fuel cell system is configured such that after an abnormality occurs in the power system, power is supplied from the fuel cell device performing power generation operation to the important power load device via an independent output line. The fuel cell equipment according to any one of claims 1 to 5.

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