JP2021157862A - Fuel cell facility - Google Patents

Abstract

To provide a fuel cell facility capable of supplying power required in a fuel cell system including a fuel cell device under power generation stop.SOLUTION: In a fuel cell facility, a fuel cell device 11 to perform a power generating operation is determined in such a manner that a total of maximum generated power of fuel cell devices 11 under a cooperative operation and under the power generating operation becomes equal to or greater than a sum of a total of power required for starting the power generating operation of a fuel cell device 11 under power generation stop, a total of maximum load power of power load devices 21 and 22 in a plurality of fuel cell systems 10 and maximum load power of a shared power load device 7. In a case where abnormality occurs in a power system 1, power is supplied from at least one of the fuel cell systems 10 including the fuel cell devices 11 under the power generating operation to a power line L, the power supplied from the power line L is consumed in the fuel cell system 10 including the fuel cell device 11 under the power generation stop, and the fuel cell device 11 starts the power generating operation.SELECTED DRAWING: Figure 1

Description

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

When a power generation device is installed in a facility such as a house or a business establishment, even if a power failure occurs in the power system, the power generation device may be able to operate independently in the facility to receive power supply. In the case of a fuel cell device as a power generation device, it is necessary to send fuel gas and oxygen to the fuel cell, circulate cooling water, etc., and operate auxiliary equipment such as pumps and blowers for that purpose. I need to let you. When the fuel cell device is connected to the power system, the fuel cell device whose power generation is stopped procures the power required for the operation of the auxiliary equipment, that is, the power required for starting the power generation operation of the fuel cell device from the power system. Then, the power generation operation can be performed.
However, if a power failure occurs in the power system, there is a problem that the power required to start the power generation operation of the fuel cell device cannot be procured from the power system.

Patent Document 1 (International Publication No. 2017/154802) includes a system provided with an auxiliary power supply unit (alternator, battery, etc.) for supplying power to auxiliary machines of a fuel cell device in the event of a power failure of the power system. Have been described. By providing such an auxiliary power supply unit, the operation of the fuel cell device can be started even while a power failure occurs in the power system, and the power load in the facility where the fuel cell device is provided is provided. Can power 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 dwelling units (fuel cell systems) having a fuel cell device and a power load device are connected is connected to a power system. Has been done. In this fuel cell facility, a dwelling unit having a fuel cell device whose power generation is stopped can receive power from a fuel cell device of another dwelling unit.

International Publication No. 2017/154802 JP-A-2007-128785

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

Patent Document 2 describes that power is supplied from another fuel cell device to a dwelling unit having a fuel cell device whose power generation is stopped via a power line. However, Patent Document 2 does not describe a blocking function for separating the power line network connecting each dwelling unit from the power system and a blocking function for separating the power line network connecting each dwelling unit at a desired position. ..
Therefore, in the event of a power failure in the power system, whether or not power is supplied from the fuel cell device during power generation operation to the dwelling unit having the fuel cell device with power generation stopped via the power line network connecting each dwelling unit. It is unknown, and it is unclear whether the fuel cell device whose power generation is stopped can be started by using the electric power supplied from the fuel cell device during the power generation operation in the event of a power failure of the power system. Further, it is unclear whether the area to which power is supplied can be selectively switched by a method such as separating the power line network connecting each dwelling unit at a desired position. For example, it is unclear whether control such as selectively supplying power to a specific dwelling unit or to a specific power consuming device in a specific dwelling unit can be performed.

Further, in the fuel cell facility of Patent Document 2, even if power is supplied from the fuel cell device during the power generation operation to the dwelling unit having the fuel cell device with the power generation stopped during the power failure of the power system, the power generation operation is in progress. When the number of fuel cell devices is small, that is, when the total power supplied from the fuel cell devices during power generation operation is small, it is possible that the necessary power cannot be supplied to all the dwelling units having the fuel cell devices whose power generation is stopped. There is sex.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a fuel cell facility capable of supplying the power required for a fuel cell system having a fuel cell device in which power generation is stopped. ..

The characteristic configuration of the fuel cell equipment according to the present invention for achieving the above object is that a power line to which a plurality of fuel cell systems having a fuel cell device and a power load device are connected is powered via a power receiving facility having a breaker. Fuel cell equipment connected to the grid
A shared power load device is connected to the power line,
In the plurality of fuel cell systems during the interconnection operation in which the power line is connected to the power system, the total of the maximum generated power of the fuel cell device during the power generation operation is the power generation of the fuel cell device whose power generation is stopped. Power generation is equal to or greater than the sum of the total power required to start operation, the total maximum load power of the power load device in the plurality of fuel cell systems, and the maximum load power of the shared power load device. Determine 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 facility, and the power load device is used in the fuel cell system having the fuel cell device during power generation operation. Power is supplied to the power line from at least one of the fuel cell systems having the fuel cell device during power generation operation, and power is supplied to the power line, and the power generation is stopped. In the fuel cell system having the above, the fuel cell device starts the power generation operation by consuming the power supplied from the power line, and in the fuel cell system having the fuel cell device in which the power generation is stopped, the power is supplied from the power line. The point is that the power load device can operate by consuming the electric power to be generated, and the shared power load device can operate by consuming the electric 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 that is performing power generation operation after an abnormality occurs in the power system. It may be configured so that power is supplied to the critical power load device via an output line.

According to the above characteristic configuration, the total number of fuel cell devices that generate power during interconnection operation in which the power line is connected to the power system is the total of the maximum generated power of the fuel cell devices that perform power generation operation, and the power generation is stopped. It should be equal to or greater than the sum of the total power required to start the power generation operation of the fuel cell device, the total maximum load power of the power load device in multiple fuel cell systems, and the maximum load power of the shared power load device. It is determined. Then, when the power line is disconnected from the power system and power from the power system is no longer supplied to the power line, power is supplied to the power load device in the fuel cell system having the fuel cell device during power generation operation. In addition, power is supplied to the power line from at least one of the fuel cell systems having the fuel cell device during the power generation operation, and is supplied from the power line in the fuel cell system having the fuel cell device during the power generation stop. In a fuel cell system having a fuel cell device in which power generation is stopped, the fuel cell device can start power generation operation by consuming the electric power, and the power load device can operate by consuming the electric power supplied from the power line. The shared power load device can operate by consuming the power supplied from the power line.
Therefore, it is possible to provide a fuel cell facility capable of supplying the power required for a fuel cell system having a fuel cell device in which power generation is stopped.

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 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 breaker. Fuel cell equipment
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.
In the plurality of fuel cell systems during the interconnection operation in which the power line is connected to the power system, the total of the maximum generated power of the fuel cell device during the power generation operation is the power generation of the fuel cell device whose power generation is stopped. The sum of the total power required to start the operation, the total maximum load power of the critical power load device in the plurality of fuel cell systems, and the maximum load power of the shared power load device, or more. Determine the fuel cell device to be operated for power generation,
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 facility, and the important power load in the fuel cell system having the fuel cell device during power generation operation. The fuel cell in which 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 during power generation operation, and power generation is stopped. In the fuel cell system having the apparatus, the fuel cell apparatus starts the power generation operation by consuming the electric power supplied from the electric power line, and in the fuel cell system having the fuel cell apparatus in which the power generation is stopped, from the electric power line. The important power load device can be operated by consuming the supplied electric power, and the shared power load device is configured to be able to operate by consuming the electric 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 critical power load device via an independent output line. It may be configured.

According to the above characteristic configuration, the total number of fuel cell devices that generate power during interconnection operation in which the power line is connected to the power system is the total of the maximum generated power of the fuel cell devices that perform power generation operation, and the power generation is stopped. It should be equal to or greater than the sum of the total power required to start the power generation operation of the fuel cell device, the total maximum load power of the critical power load device in multiple fuel cell systems, and the maximum load power of the shared power load device. Will be decided. Then, when the power line is disconnected from the power system and the power from the power system is no longer supplied to the power line, the power supply to the important power load device is supplied in the fuel cell system having the fuel cell device during the power generation operation. Power is supplied to the power line from at least one of the fuel cell systems having the fuel cell device during the power generation operation, and is supplied from the power line in the fuel cell system having the fuel cell device during the power generation stop. In a fuel cell system having a fuel cell device in which power generation is stopped, the fuel cell device can start power generation operation by consuming the generated power, and the important power load device can operate by consuming the power supplied from the power line. Moreover, the shared power load device can operate by consuming the power supplied from the power line.
Therefore, it is possible to provide a fuel cell facility capable of supplying the power required for a fuel cell system having a fuel cell device in which power generation is stopped.

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 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 breaker. Fuel cell equipment
The power load device includes an important power load device and a general power load device.
In the plurality of fuel cell systems during the interconnection operation in which the power line is connected to the power system, the total of the maximum generated power of the fuel cell device during the power generation operation is the power generation of the fuel cell device whose power generation is stopped. The fuel cell device to be operated for power generation is determined so as to be equal to or greater than the sum of the total power required to start the operation and the total maximum load power of the critical 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 breaker of the power receiving facility, and the important power load in the fuel cell system having the fuel cell device during power generation operation. 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 during power generation operation, and the fuel cell device whose power generation is stopped is used. In the fuel cell system having the fuel cell system, the fuel cell device consumes the electric power supplied from the power line to start the power generation operation, and in the fuel cell system having the fuel cell device in which the power generation is stopped, the power is supplied from the power line. The point is that it is configured so that the critical power load device can operate by consuming a certain amount of electric 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 critical power load device via an independent output line. It may be configured.

According to the above-mentioned characteristic configuration, the total number of fuel cell devices that generate power during the interconnection operation in which the power line is connected to the power system is the total of the maximum generated power of the fuel cell devices that perform the power generation operation, and the power generation is stopped. It is determined to be greater than or equal to the sum of the total power required to start the power generation operation of the fuel cell device and the total maximum load power of the critical power load devices in the plurality of fuel cell systems. Then, when the power line is disconnected from the power system and the power from the power system is no longer supplied to the power line, the power supply to the important power load device is supplied in the fuel cell system having the fuel cell device during the power generation operation. Power is supplied to the power line from at least one of the fuel cell systems having the fuel cell device during the power generation operation, and is supplied from the power line in the fuel cell system having the fuel cell device during the power generation stop. The fuel cell device can start the power generation operation by consuming electric power, and in the fuel cell system having the fuel cell device in which the power generation is stopped, the important power load device can operate by consuming the electric power supplied from the power line.
Therefore, it is possible to provide a fuel cell facility capable of supplying the power required for a fuel cell system having a fuel cell device in which power generation is stopped.

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 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 breaker. Fuel cell equipment
The power load device includes an important power load device and a general power load device.
In the plurality of fuel cell systems during the interconnection operation in which the power line is connected to the power system, the total of the maximum generated power of the fuel cell device during the power generation operation is the power generation of the fuel cell device whose power generation is stopped. The power generation operation is performed so as to be equal to or greater than the sum of the total power required to start the operation and the total maximum load power of the critical power load device in the fuel cell system having the fuel cell device during the power generation operation. Determine the fuel cell device,
When an abnormality occurs in the power system, the power line is disconnected from the power system by the breaker of the power receiving facility, and the important power load in the fuel cell system having the fuel cell device during power generation operation. 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 during power generation operation, and the fuel cell device whose power generation is stopped is used. The fuel cell system has a point that the fuel cell device is configured to start power generation operation by consuming the electric power supplied from the electric 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 critical power load device via an independent output line. It may be configured.

According to the above characteristic configuration, the total number of fuel cell devices that generate power during the interconnection operation in which the power line is connected to the power system is the total of the maximum generated power of the fuel cell devices that perform the power generation operation, and the power generation is stopped. It is determined to be equal to or greater than the sum of the total power required to start the power generation operation of the fuel cell device and the total maximum load power of the critical power load device in the fuel cell system having the fuel cell device during the power generation operation. NS. Then, when the power line is disconnected from the power system and the power from the power system is no longer supplied to the power line, the power supply to the important power load device is supplied in the fuel cell system having the fuel cell device during the power generation operation. Power is supplied to the power line from at least one of the fuel cell systems having the fuel cell device during the power generation operation, and is supplied from the power line in the fuel cell system having the fuel cell device during the power generation stop. The fuel cell device can start power generation operation by consuming electric power.
Therefore, it is possible to provide a fuel cell facility capable of supplying the power required for a fuel cell system having a fuel cell device in which power generation is stopped.

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 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 breaker. Fuel cell equipment
The power load device includes an important power load device and a general power load device.
In the plurality of fuel cell systems during the interconnection operation in which the power line is connected to the power system, the total of the maximum generated power of the fuel cell device during the power generation operation is among the fuel cell devices whose power generation is stopped. The total power required to start the power generation operation of the fuel cell device having the highest priority in the start-up order and the maximum load power of the critical power load device in the fuel cell system having the fuel cell device during the power generation operation. Determine the fuel cell device to be operated for power generation so that it is equal to or greater than the sum of the total.
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 facility, and the important power load in the fuel cell system having the fuel cell device during power generation operation. The fuel cell in which 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 during power generation operation, and power generation is stopped. Among the devices, power is supplied from the power line to the fuel cell system having the fuel cell device in order from the one having the highest priority of the start-up order, and the fuel cell device is configured to start power generation operation. It is in the point of being 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 critical power load device via an independent output line. It may be configured.

According to the above characteristic configuration, the total number of fuel cell devices that generate power during the interconnection operation in which the power line is connected to the power system is the total of the maximum generated power of the fuel cell devices that perform the power generation operation, and the power generation is stopped. The total amount of power required to start the power generation operation of the fuel cell device with the highest priority in the start-up order among the fuel cell devices, and the maximum load of the critical power load device in the fuel cell system having the fuel cell device during the power generation operation. It is determined to be greater than or equal to the sum of the total power. Then, when the power line is disconnected from the power system and the power from the power system is no longer supplied to the power line, the power supply to the important power load device is supplied in the fuel cell system having the fuel cell device during the power generation operation. Among the fuel cell devices that have been operated and have a fuel cell device that is in power generation operation, power is supplied to the power line from at least one of the fuel cell systems, and the power generation is stopped, the priority of the start order is Power is supplied from the power line to the fuel cell system having the fuel cell device whose power generation is stopped in descending order, and the fuel cell device can start the power generation operation.
Therefore, it is possible to provide a fuel cell facility capable of supplying the power required for a fuel cell system having a fuel cell device in which power generation is stopped.

It is a figure which shows the structure of the fuel cell equipment of 1st Embodiment. It is a figure which shows the structure of the fuel cell equipment of 1st Embodiment. It is a figure which shows the structure of the fuel cell equipment of 1st Embodiment. It is a figure which shows the structure of the fuel cell equipment of 2nd Embodiment. It is a figure which shows the structure of the fuel cell equipment of 2nd Embodiment. It is a figure which shows the structure of the fuel cell equipment of 2nd Embodiment. It is a figure which shows the structure of the fuel cell equipment of 3rd Embodiment. It is a figure which shows the structure of the fuel cell equipment of 3rd Embodiment. It is a figure which shows the structure of the fuel cell equipment of 3rd Embodiment. It is a figure which shows the structure of the fuel cell equipment of 4th Embodiment. It is a figure which shows the structure of the fuel cell equipment of 4th Embodiment. It is a figure which shows the structure of the fuel cell equipment of 4th Embodiment. It is a figure which shows the structure of the fuel cell equipment of 5th Embodiment. It is a figure which shows the structure of the fuel cell equipment of 5th Embodiment. It is a figure which shows the structure of the fuel cell equipment of 5th Embodiment.

<First Embodiment>
The fuel cell equipment according to the first embodiment of the present invention will be described below with reference to the 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 a state in which the fuel cell device 11 is in interconnection operation, FIG. 2 is a diagram showing a state immediately after a power failure of the power system 1, and FIG. 3 is a diagram showing a state of the fuel cell device 11 immediately after a power failure. It is a figure which shows the state in the self-sustaining operation. In FIGS. 1 to 3, each fuel cell system 10 corresponds to a facility such as each dwelling unit of an apartment house or each tenant of a commercial building. Each fuel cell system 10 is configured to collectively receive electric power from the electric power system 1 via one electric power receiving facility 2.

As shown in the figure, the power line L is composed of an internal power line 20 and an interconnect power line 6, and is connected to the power system 1 via a power receiving facility 2 having a circuit breaker 4. Then, the interconnect power line 6 that connects the plurality of fuel cell systems 10 to each other is connected to the power system 1 via the power receiving facility 2. In this way, it is possible to construct a fuel cell facility in which the power line L to which a plurality of fuel cell systems 10 having the fuel cell device 11, the critical 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 a lamp or a water pump installed in a common area such as an apartment house or a commercial building.
In the figure, the critical 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 is described as. The critical power load device 21 is, for example, a main lighting device, a computer device, or the like. The general power load device 22 is a lighting device or the like that may be turned off in the event of a power failure in the power system 1. Of the power load devices installed in the fuel cell system 10, which power load is the important power load device 21 and which power load is the general power load device 22 can be appropriately set.

[Power receiving equipment 2]
The control device 5 controls the operation of the circuit breaker 4 included in the power receiving equipment 2. For example, the power receiving facility 2 has a voltage detector 3 that measures the voltage of the power supplied from the power system 1. The detection result of the voltage detector 3 is transmitted to the control device 5. The control device 5 is a circuit breaker 4 of the power receiving facility 2 when the voltage of the power in the power system 1 detected by the voltage detector 3 is less than the set voltage, that is, when an abnormality such as a power failure occurs in the power system 1. Is shut off. As a result, the interconnected 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. After that, when the voltage of the electric power in the electric power system 1 detected by the voltage detector 3 becomes equal to or higher than the set voltage, that is, the electric power supply from the electric power system 1 is normally performed in the control device 5. In this case, the breaker 4 of the power receiving equipment 2 is connected and operated at an appropriate timing. As a result, the interconnect power line 6 to which the plurality of fuel cell systems 10 and the shared power load device 7 are connected is connected to the power system 1.

[Fuel cell system 10]
The fuel cell system 10 includes a fuel cell device 11 connected to the internal power line 20, an important power load device 21, and a general power load device 22. The internal power line 20 of each fuel cell system 10 is connected to the interconnect power line 6. In the present embodiment, the first connection point P1, the second connection point P2, and the 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 with respect 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 unit 12 and a power conversion unit 13 for converting the electric power generated by the fuel cell unit 12 into electric power having a desired voltage, frequency, and phase and outputting the electric power. The fuel cell unit 12 can be realized by using, for example, a solid oxide fuel cell (SOFC). Alternatively, the fuel cell unit 12 may be realized by using another type of fuel cell such as a polymer electrolyte fuel cell (PEFC). In addition, the fuel cell device 11 includes an auxiliary device 14 such as a blower for sending fuel gas and oxygen to the fuel cell, a pump for circulating cooling water, and a battery control for controlling the operation of the fuel cell device 11. It has a part 15. Although not shown, the fuel cell unit 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 by a reforming process. The auxiliary device 14 provided in the fuel cell device 11 is not limited to the above-mentioned one, and various other devices are provided in the fuel cell device 11. An interconnection output line 16 and an independent output line 17 are connected to the output end of the power conversion unit 13. An interconnection side circuit breaker 18 is provided in the middle of the interconnection output line 16, and an independent side circuit breaker 19 is provided in the middle of the independent output line 17. The battery control unit 15 controls the operations of the fuel cell unit 12, the power conversion unit 13, the auxiliary machine 14, the interconnection side circuit breaker 18, and the self-supporting circuit breaker 19.

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

The critical power load device 21 is connected to the switch 23. Specifically, the switch 23 has a terminal a connected to the internal power line 20, a terminal b connected to the self-supporting output line 17, and a terminal c connected to the critical power load device 21. Then, the switch 23 automatically sets the power supply source for the critical power load device 21 to either the power supplied via the internal power line 20 or the power supplied via the self-supporting output line 17. It works to switch. In the present embodiment, when power is supplied to the terminal a connected to the self-supporting output line 17, the switch 23 switches to a state in which the terminal a and the terminal c are connected, and the power is supplied to the terminal a. If not, the terminal b and the terminal c are switched to the connected state. That is, when the battery control unit 15 connects and operates the self-supporting side breaker 19 and supplies the electric power generated by the fuel cell unit 12 from the self-supporting output line 17 to the terminal b of the switch 23, the switch 23 The terminal b and the terminal c are connected, and the electric power generated by the fuel cell unit 12 is supplied to the important power load device 21. On the other hand, when the battery control unit 15 shuts off the independent side circuit breaker 19 and does not supply the electric power generated by the fuel cell unit 12 from the independent output line 17 to the terminal b of the switch 23, the switch is switched. At 23, the terminal a and the terminal c are connected, and power is supplied to the critical power load device 21 from the internal power line 20.

Since the fuel cell device 11 connects and operates the interconnection side circuit breaker 18 and shuts off the self-sustaining side circuit breaker 19 during the interconnection operation, the interconnection output line 16 is connected to the fuel cell device 11 that is performing the power generation operation. Although power is supplied to the internal power line 20 via the above, power is not supplied to the self-supporting output line 17 (that is, to the terminal b of the switch 23). That is, during the interconnection operation, the terminal a and the terminal c are connected in the switch 23, and power is supplied to the critical power load device 21 from the internal power line 20.
On the other hand, since the fuel cell device 11 connects and operates both the interconnection side circuit breaker 18 and the self-sustaining side circuit breaker 19 during the self-sustaining operation, the interconnection output line from the fuel cell device 11 performing the power generation operation. Power is supplied to both the 16 and the self-supporting output line 17. As a result, the generated power of the fuel cell device 11 is supplied to the internal power line 20 and is supplied to the terminal b of the switch 23. That is, during the self-sustaining operation, the terminal b and the terminal c are connected in the switch 23, and the important power load device 21 of the same fuel cell system 10 is connected from the fuel cell device 11 performing the power generation operation via the self-sustaining output line 17. Power is supplied to.
In the fuel cell system 10, when a surplus (surplus power) is generated in the power supplied by the fuel cell device 11 to the internal power line 20, the surplus power is supplied to the interconnection power line 6.

The general power load device 22 is connected to the internal power line 20.

[During interconnection operation]
FIG. 1 is a diagram showing a state in which the fuel cell device 11 is in interconnection operation. In the figure, the parts where power is supplied are drawn with thick lines.
When the power supply from the power system 1 is normally performed, 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 facility 2. do. Then, when the power line L (interconnection power line 6) is connected to the power system 1 by connecting and operating the breaker 4 of the power receiving facility 2, the fuel cell device 11 is stopped in power generation. 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 the power supplied from the power line L (internal power line 20 and interconnect power line 6). can. That is, in the case of interconnection operation, at least one of the electric power supplied from the electric power system 1 and the electric power supplied from the fuel cell device 11 during the power generation operation is supplied to the electric power line L, so that electric 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 power generation of the fuel cell device 11 is stopped can operate. Further, the shared power load device 7 can also operate by consuming the power supplied via the interconnection power line 6.

However, when an abnormality such as a power failure occurs in the power system 1, the circuit breaker 4 of the power receiving facility 2 is shut off and the power line L (internal power line 20 and interconnected power line 6) is disconnected from the power system 1. In that case, only the electric power supplied from the fuel cell device 11 during the power generation operation is supplied to the electric power line L, but the magnitude of the electric power is limited. Therefore, it is unclear whether the electric power supplied from the fuel cell device 11 during the power generation operation to the electric power line L alone can meet all the electric power demands in the plurality of fuel cell systems 10.

Therefore, in the fuel cell equipment of the present embodiment, the total maximum generated power of the fuel cell device 11 during the power generation operation in the plurality of fuel cell systems 10 during the interconnection operation in which the power line L is connected to the power system 1 is calculated. , The total power required to start the power generation operation of the fuel cell device 11 whose power generation is stopped, 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 for power generation operation is determined so as to be equal to or greater than the sum of the total and the maximum load power of the shared power load device 7. That is, even if an abnormality such as a power failure occurs in the power system 1 and the power line L (internal power line 20 and interconnected power line 6) is disconnected from the power system 1, the power line L is connected to the fuel cell device 11 during power generation operation. The number of operating fuel cell devices 11 is controlled during the interconnection operation so that all the electric power demands in the plurality of fuel cell systems 10 can be covered only by the electric power supplied to the fuel cell system 10.

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

For example, when the control device 5 receives information that the fuel cell device 11 during the power generation operation is scheduled to stop power generation, the control device 5 "generates power" from the fuel cell device 11 which is in the power generation operation but is scheduled to stop power generation. "Total of maximum generated power of fuel cell device 11 during power generation operation" and "necessary for starting power generation operation of fuel cell device 11 while power generation is stopped" in a state of being regarded as "stopped fuel cell device 11" The sum of the total power generation, the total maximum load power of the power load devices (important power load device 21 and the 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 considers the fuel cell device 11 scheduled to stop power generation as the "fuel cell device 11 whose power generation is stopped", and the "total maximum generated power of the fuel cell device 11 during power generation operation" is calculated. , "The total power required to start the power generation operation of the fuel cell device 11 whose power generation is stopped, 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. If the sum of the total of 11 is determined, and before the fuel cell device 11 scheduled to stop power generation actually stops power generation, a command to start power generation operation is transmitted to the fuel cell device 11 determined to newly start power generation operation. do. The control device 5 may transmit a power generation operation start command to the fuel cell device 11 that has decided to newly start the power generation operation after the fuel cell device 11 has stopped power generation.

It is possible to appropriately set which fuel cell device 11 among the fuel cell devices 11 whose power generation is stopped is determined by the control device 5 as the fuel cell device 11 to newly start the power generation operation. For example, the control device 5 continuously receives from each fuel cell system 10 and is based on the information indicating whether the fuel cell device 11 is in power generation operation or power generation stop. As the fuel cell device 11 for deriving the cumulative operating time of 11 and newly starting the power generation operation, the fuel cell device 11 having a short cumulative operating time can be preferentially determined. Alternatively, the control device 5 may randomly determine the fuel cell device 11 to newly start the power generation operation from the fuel cell devices 11 whose power generation is stopped.

In the case of the interconnection operation illustrated in FIG. 1, the fuel cell device 11A of the fuel cell system 10A is in the power generation stop, the fuel cell device 11B of the fuel cell system 10B is in the power generation operation, and the fuel of the fuel cell system 10C. 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 during the power generation operation" is the "total of the power required to start the power generation operation of the fuel cell device 11A during the power generation stop" and the plurality of fuel cells. It is equal to or greater than the sum of the total maximum load power of the power load devices (important power load device 21 and the general power load device 22) in the system 10 and the maximum load power of the shared power load device 7.

[Immediately after a power outage]
FIG. 2 is a diagram showing a state immediately after a power failure of the power system 1. In the figure, the parts 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 less than the set voltage, that is, when an abnormality such as a power failure occurs in the power system 1, the control device 5 breaks the power receiving facility 2. By shutting off the power line L (interconnection power line 6), the power line L (interconnection 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 outputs AC power in accordance with its motive signal, so that stable power generation operation can be performed. In addition, the control device 5 instructs each fuel cell system 10 to generate power (self-sustaining operation) of the fuel cell device 11 at a predetermined output (for example, maximum generated power).

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

When the fuel cell device 11 is operating at the maximum generated power and the maximum generated power is larger than the total 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. Be supplied. Then, the electric power is used for starting the power generation operation of the fuel cell device 11 (that is, the auxiliary machine 14) in the fuel cell system 10A having the fuel cell device 11A in which power generation is stopped, which is also connected to the interconnect power line 6. (Load power), because of the operation of the critical power load device 21, it is used for the operation of the general power load device 22. Further, the electric power supplied from the fuel cell system 10 having the fuel cell device 11 during the 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 breaker 4 of the power receiving equipment 2, and the fuel during power generation operation. 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 at least one of the fuel cell systems 10 having the fuel cell device 11 during power generation operation In the fuel cell system 10 having the fuel cell device 11 in which the power is supplied to the power line L and the power generation is stopped, the fuel cell device 11 starts the power generation operation by consuming the power supplied from the power line L. In addition, the fuel cell system 10 having the fuel cell device 11 whose power generation is stopped is configured so that the important power load device 21 and the general power load device 22 can operate by consuming the power supplied from the power line L.

[During independent operation]
FIG. 3 is a diagram showing a state of the fuel cell device 11 during independent operation. In the figure, the parts where power is supplied are drawn with thick lines.
As shown in the figure, in all the fuel cell systems 10 including the fuel cell device 11A of the fuel cell system 10A whose power generation was stopped immediately after the power failure, the fuel cell device 11 performs power generation operation (self-sustaining operation). There is. Further, since the fuel cell device 11A of the fuel cell system 10A, which had stopped power generation immediately after the power failure, connects and operates both the interconnection side circuit breaker 18 and the independent side circuit breaker 19, the generated power of the fuel cell device 11A. Is supplied to the internal power line 20 and is supplied to the terminal b of the switch 23. That is, in the fuel cell system 10A, after an abnormality occurs in the power system 1, the terminal b and the terminal c are connected in the switch 23, and the important power is generated from the fuel cell device 11A that is 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 system 1, the fuel cell device 11 of each fuel cell system 10 is sufficient for the critical 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 has a different power supply destination from that of the above embodiment immediately after a power failure and during independent operation. The fuel cell equipment of the second embodiment will be described below, but the description of the same configuration as that of 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 a state in which the fuel cell device 11 is in interconnection operation, FIG. 5 is a diagram showing a state immediately after a power failure of the power system 1, and FIG. 6 is a diagram showing a state of the fuel cell device 11 immediately after a power failure. It is a figure which shows the state in the 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 the power supply when the circuit breaker 24 is connected and operated, and cannot receive the power supply when the circuit breaker 24 is cut off. ..

[During interconnection operation]
FIG. 4 is a diagram showing a state in which the fuel cell device 11 is in interconnection operation. In the figure, the parts where power is supplied are drawn with thick lines.
When the power supply from the power system 1 is normally performed, 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 facility 2. do. Further, in each fuel cell system 10, the circuit breaker 24 is connected and operated. Then, when the power line L (interconnection power line 6) is connected to the power system 1 by connecting and operating the breaker 4 of the power receiving facility 2, the fuel cell device 11 is stopped in power generation. 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 the power supplied from the power line L (internal power line 20 and interconnect power line 6). can. That is, in the case of interconnection operation, at least one of the electric power supplied from the electric power system 1 and the electric power supplied from the fuel cell device 11 during the power generation operation is supplied to the electric power line L, so that electric 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 power generation of the fuel cell device 11 is stopped can operate. Further, the shared power load device 7 can also operate using the power supplied via the interconnection power line 6.

In the fuel cell equipment of the present embodiment, the total of the maximum generated power of the fuel cell device 11 during the power generation operation in the plurality of fuel cell systems 10 during the interconnection operation in which the power line L is connected to the power system 1 is generated. The total power required to start the power generation operation of the stopped fuel cell device 11, the total maximum load power of the critical power load device 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 for power generation operation is determined so as to be equal to or greater than the sum of. That is, even if an abnormality such as a power failure occurs in the power system 1 and the power line L (internal power line 20 and interconnected power line 6) is disconnected from the power system 1, the power line L is connected to the fuel cell device 11 during power generation operation. The electric power supplied to the plurality of fuel cell systems 10 can be used to meet all the electric power demands of the plurality of fuel cell systems 10 (excluding the electric power demands of the general power load device 22). The number of operating units of the battery device 11 is controlled.
As described above, in the present 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 during the power generation operation is scheduled to stop power generation, the control device 5 "generates power" from the fuel cell device 11 which is in the power generation operation but is scheduled to stop power generation. "Total of maximum generated power of fuel cell device 11 during power generation operation" and "necessary for starting power generation operation of fuel cell device 11 while power generation is stopped" in a state of being regarded as "stopped fuel cell device 11" The sum of the total power generation, the total maximum load power of the critical power load device 21 in the plurality of fuel cell systems 10, and the maximum load power of the shared power load device 7 is compared. Then, in the control device 5, the "total of the maximum generated power of the fuel cell device 11 during the power generation operation" is the "total of the power required to start the power generation operation of the fuel cell device 11 during the power generation stop" and a plurality of fuels. If the sum of the total maximum load power of the critical power load device 21 in the battery system 10 and the maximum load power of the shared power load device 7 is less than the sum, the power generation of the fuel cell device 11 whose power generation is stopped is newly generated. One or a plurality of fuel cell devices 11 to be started are determined, and the fuel decided to newly start the power generation operation before the fuel cell device 11 scheduled to stop the power generation actually stops the power generation. A command to start power generation operation is transmitted to the battery device 11. The control device 5 may transmit a power generation operation start command to the fuel cell device 11 that has decided to newly start the power generation operation after the fuel cell device 11 has stopped power generation.

In the case of the interconnection operation illustrated in FIG. 4, the fuel cell device 11A of the fuel cell system 10A is in the power generation stop, the fuel cell device 11B of the fuel cell system 10B is in the power generation operation, and the fuel of the fuel cell system 10C. 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 during the power generation operation" is the "total of the power required to start the power generation operation of the fuel cell device 11A during the power generation stop" and the plurality of fuel cells. It is equal to or greater than the sum of the total maximum load power of the critical power load device 21 in the system 10 and the maximum load power of the shared power load device 7.

[Immediately after a power outage]
FIG. 5 is a diagram showing a state immediately after a power failure of the power system 1. In the figure, the parts 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 less than the set voltage, that is, when an abnormality such as a power failure occurs in the power system 1, the control device 5 breaks the power receiving facility 2. By shutting off the power line L (interconnection power line 6), the power line L (interconnection 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 generate power (self-sustaining operation) of the fuel cell device 11 at a predetermined output (for example, maximum generated power).

In each fuel cell system 10, the circuit breaker 24 is shut off by, for example, a command from the battery control unit 15 of the fuel cell unit 12. As a result, the general power load device 22 included in each fuel cell system 10 cannot receive the power supply.

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

While the fuel cell device 11 is operating at the maximum generated power, surplus power is supplied to the interconnection power line 6. Then, the electric power is used to start the power generation operation of the fuel cell device 11A in the fuel cell system 10A having the fuel cell device 11A whose power generation is stopped, which is also connected to the interconnection power line 6 (that is, the auxiliary machine 14). (Load power), which is used for the operation of the critical power load device 21A. Further, the electric power supplied from the fuel cell system 10 having the fuel cell device 11 during the 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 breaker 4 of the power receiving equipment 2, and the fuel during power generation operation. 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 from at least one of the fuel cell systems 10 having the fuel cell device 11 during power generation operation to the power line L. In the fuel cell system 10 having the fuel cell device 11 which is supplied and the power generation is stopped, the fuel cell device 11 starts the power generation operation by consuming the electric power supplied from the power line L, and the power generation is stopped. The fuel cell system 10 having the fuel cell device 11 is configured so that the critical power load device 21 can operate by consuming the electric power supplied from the power line L.

[During independent operation]
FIG. 6 is a diagram showing a state of the fuel cell device 11 during independent operation. In the figure, the parts where power is supplied are drawn with thick lines.
As shown in the figure, in all the fuel cell systems 10 including the fuel cell device 11A of the fuel cell system 10A whose power generation was stopped immediately after the power failure, the fuel cell device 11 performs power generation operation (self-sustaining operation). There is.
Further, since the fuel cell device 11A of the fuel cell system 10A, which had stopped power generation immediately after the power failure, connects and operates both the interconnection side circuit breaker 18 and the independent side circuit breaker 19, the generated power of the fuel cell device 11A. Is supplied to the internal power line 20 and is supplied to the terminal b of the switch 23. That is, in the fuel cell system 10A, after an abnormality occurs in the power system 1, the terminal b and the terminal c are connected in the switch 23, and the important power is generated from the fuel cell device 11A that is 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 system 1, sufficient power can be supplied from the fuel cell device 11 of each fuel cell system 10 to the critical power load device 21 and the shared power load device 7.

<Third Embodiment>
The fuel cell equipment of the third embodiment has a different power supply destination from that of the above embodiment immediately after a power failure and during independent operation. The fuel cell equipment of the third embodiment will be described below, but the description of the same configuration as that 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 a state in which the fuel cell device 11 is in interconnection operation, FIG. 8 is a diagram showing a state immediately after a power failure of the power system 1, and FIG. 9 is a diagram showing a state of the fuel cell device 11 immediately after a power failure. It is a figure which shows the state in the 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 interconnection power line 6 (L). The circuit breaker 25 switches whether the shared power load device 7 is connected to the interconnect power line 6 or not. Therefore, the shared power load device 7 can receive the power supply when the circuit breaker 25 is connected and operated, and cannot receive the power supply when the circuit breaker 25 is cut off. ..

[During interconnection operation]
FIG. 7 is a diagram showing a state in which the fuel cell device 11 is in interconnection operation. In the figure, the parts where power is supplied are drawn with thick lines.
When the power supply from the power system 1 is normally performed, 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 facility 2. , The circuit breaker 25 is connected and operated. Further, in each fuel cell system 10, the circuit breaker 24 is connected and operated. Then, when the power line L (interconnection power line 6) is connected to the power system 1 by connecting and operating the breaker 4 of the power receiving facility 2, the fuel cell device 11 is stopped in power generation. 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 the power supplied from the power line L (internal power line 20 and interconnect power line 6). can. That is, in the case of interconnection operation, at least one of the electric power supplied from the electric power system 1 and the electric power supplied from the fuel cell device 11 during the power generation operation is supplied to the electric power line L, so that electric 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 power generation of the fuel cell device 11 is stopped can operate. Further, the shared power load device 7 can also operate using the power supplied via the interconnection power line 6.

In the fuel cell facility of the present embodiment, the total of the maximum generated power of the fuel cell device 11 during the power generation operation in the plurality of fuel cell systems 10 during the interconnection operation in which the power line L is connected to the power system 1 is generated. The power generation operation is equal to or greater than the sum of the total power required to start the power generation operation of the stopped fuel cell device 11 and the total maximum load power of the critical power load devices 21 in the plurality of fuel cell systems 10. The fuel cell device 11 to be used is determined. That is, even if an abnormality such as a power failure occurs in the power system 1 and the power line L (internal power line 20 and interconnected power line 6) is disconnected from the power system 1, the power line L is connected to the fuel cell device 11 during power generation operation. All the electric power demands in the plurality of fuel cell systems 10 (excluding the electric power demand of the general electric power load device 22 and the electric power demand of the shared electric power load device 7) can be covered only by the electric power supplied to the power supply device 7. The number of operating fuel cell devices 11 is controlled during the interconnection operation.
As described above, in the present 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 during the power generation operation is scheduled to stop power generation, the control device 5 "generates power" from the fuel cell device 11 which is in the power generation operation but is scheduled to stop power generation. "Total of maximum generated power of fuel cell device 11 during power generation operation" and "necessary for starting power generation operation of fuel cell device 11 while power generation is stopped" in a state of being regarded as "stopped fuel cell device 11" The sum of the total power generation and the total maximum load power generation of the critical power load devices 21 in the plurality of fuel cell systems 10 is compared. Then, in the control device 5, the "total of the maximum generated power of the fuel cell device 11 during the power generation operation" is the "total of the power required to start the power generation operation of the fuel cell device 11 during the power generation stop" and a plurality of fuels. If it is less than the sum of the total maximum load power of the critical power load device 21 in the battery system 10, one or more fuels of the fuel cell device 11 whose power generation is stopped to newly start the power generation operation. A command to start power generation operation is given to the fuel cell device 11 that has determined the battery device 11 and has decided to start a new power generation operation before the fuel cell device 11 scheduled to stop power generation actually stops power generation. To send. The control device 5 may transmit a power generation operation start command to the fuel cell device 11 that has decided to newly start the power generation operation after the fuel cell device 11 has stopped power generation.

In the case of the interconnection operation illustrated in FIG. 7, the fuel cell device 11A of the fuel cell system 10A is in the power generation stop, the fuel cell device 11B of the fuel cell system 10B is in the power generation operation, and the fuel of the fuel cell system 10C. 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 during the power generation operation" is the "total of the power required to start the power generation operation of the fuel cell device 11A during the power generation stop" and the plurality of fuel cells. It is equal to or greater than the sum of the total maximum load power of the critical power load device 21 in the system 10.

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

In each fuel cell system 10, the circuit breaker 24 is shut off by, for example, a command from the battery control unit 15 of the fuel cell unit 12. As a result, the general power load device 22 included in each fuel cell system 10 cannot receive the power supply.

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

While the fuel cell device 11 is operating at the maximum generated power, surplus power is supplied to the interconnection power line 6. Then, the electric power is used to start the power generation operation of the fuel cell device 11A in the fuel cell system 10A having the fuel cell device 11A whose power generation is stopped, which is also connected to the interconnection power line 6 (that is, the auxiliary machine 14). (Load power), which is used for the operation of the critical power load device 21A. Since the circuit breaker 25 is shut off, 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 breaker 4 of the power receiving equipment 2, and the fuel during power generation operation. 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 from at least one of the fuel cell systems 10 having the fuel cell device 11 during power generation operation to the power line L. In the fuel cell system 10 having the fuel cell device 11 which is supplied and the power generation is stopped, the fuel cell device 11 starts the power generation operation by consuming the electric power supplied from the power line L, and the fuel cell whose power generation is stopped. The fuel cell system 10 having the device 11 is configured so that the critical power load device 21 can operate by consuming the power supplied from the power line L.

[During independent operation]
FIG. 9 is a diagram showing a state of the fuel cell device 11 during independent operation. In the figure, the parts where power is supplied are drawn with thick lines.
As shown in the figure, in all the fuel cell systems 10 including the fuel cell device 11A of the fuel cell system 10A whose power generation was stopped immediately after the power failure, the fuel cell device 11 performs power generation operation (self-sustaining operation). There is.
Further, since the fuel cell device 11A of the fuel cell system 10A, which had stopped power generation immediately after the power failure, connects and operates both the interconnection side circuit breaker 18 and the independent side circuit breaker 19, the generated power of the fuel cell device 11A. Is supplied to the internal power line 20 and is supplied to the terminal b of the switch 23. That is, in the fuel cell system 10A, after an abnormality occurs in the power system 1, the terminal b and the terminal c are connected in the switch 23, and the important power is generated from the fuel cell device 11A that is 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 system 1, sufficient power can be supplied from the fuel cell device 11 of each fuel cell system 10 to the critical power load device 21.

<Fourth Embodiment>
The fuel cell equipment of the fourth embodiment is different from the above-described embodiment in the power supply destination immediately after the power failure and during the independent operation. The fuel cell equipment of the fourth embodiment will be described below, but the description of the same configuration as that of 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 a state in which the fuel cell device 11 is in interconnection operation, FIG. 11 is a diagram showing a state immediately after a power failure of the power system 1, and FIG. 12 is a diagram showing a state of the fuel cell device 11 immediately after a power failure. It is a figure which shows the state in the 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 the power supply when the circuit breaker 26 is connected and operated, and cannot receive the power supply when the circuit breaker 26 is cut off. .. Further, the critical power load device 21 can receive power supply when the circuit breaker 26 is connected and operated, and when the circuit breaker 26 is connected and operated, the critical power load device 21 is connected to the terminal b of the switch 23. Power can be supplied only when power is supplied.

[During interconnection operation]
FIG. 10 is a diagram showing a state in which the fuel cell device 11 is in interconnection operation. In the figure, the parts where power is supplied are drawn with thick lines.
When the power supply from the power system 1 is normally performed, 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 facility 2. , The circuit breaker 25 is connected and operated. Further, in each fuel cell system 10, the circuit breaker 26 is connected and operated. Then, when the power line L (interconnection power line 6) is connected to the power system 1 by connecting and operating the breaker 4 of the power receiving facility 2, the fuel cell device 11 is stopped in power generation. 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 the power supplied from the power line L (internal power line 20 and interconnect power line 6). can. That is, in the case of interconnection operation, at least one of the electric power supplied from the electric power system 1 and the electric power supplied from the fuel cell device 11 during the power generation operation is supplied to the electric power line L, so that electric 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 power generation of the fuel cell device 11 is stopped can operate. Further, the shared power load device 7 can also operate using the power supplied via the interconnection power line 6.

In the fuel cell equipment of the present embodiment, the total of the maximum generated power of the fuel cell device 11 during the power generation operation in the plurality of fuel cell systems 10 during the interconnection operation in which the power line L is connected to the power system 1 is generated. The sum of the total power required to start the power generation operation of the stopped fuel cell device 11 and the total maximum load power of the critical power load device 21 in the fuel cell system 10 having the fuel cell device 11 during the power generation operation. As described above, the fuel cell device 11 for power generation operation is determined. That is, even if an abnormality such as a power failure occurs in the power system 1 and the power line L (internal power line 20 and interconnected power line 6) is disconnected from the power system 1, the power line L is connected to the fuel cell device 11 during power generation operation. All the electric power demands in the plurality of fuel cell systems 10 (however, the electric power demand of the general electric power load device 22 and the electric power demand of the shared electric power load device 7 and the fuel cell device 11 in which the power generation is stopped are provided. The number of operating units of the fuel cell device 11 is controlled during the interconnection operation so as to be able to cover the power demand of the important power load device 21 of the fuel cell system 10.
As described above, in the present embodiment, the fuel cell system 10 provided with 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 device 11 in which power generation is stopped. 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 during the power generation operation is scheduled to stop power generation, the control device 5 "generates power" from the fuel cell device 11 which is in the power generation operation but is scheduled to stop power generation. "Total of maximum generated power of fuel cell device 11 during power generation operation" and "necessary for starting power generation operation of fuel cell device 11 while power generation is stopped" in a state of being regarded as "stopped fuel cell device 11" The sum of the total power and the total maximum load power of the critical power load device 21 in the fuel cell system 10 having the fuel cell device 11 during power generation operation is compared. Then, in the control device 5, the "total of the maximum generated power of the fuel cell device 11 during the power generation operation" is the "total of the power required to start the power generation operation of the fuel cell device 11 during the power generation stop" and the power generation operation. If it is less than the sum of the total maximum load power of the critical power load device 21 in the fuel cell system 10 having the fuel cell device 11 of the above, the power generation operation is newly started among the fuel cell devices 11 whose power generation is stopped. One or a plurality of fuel cell devices 11 to be operated are determined, and the fuel cell device 11 determined to newly start the power generation operation before the fuel cell device 11 scheduled to stop the power generation actually stops the power generation. Is sent a command to start power generation operation. The control device 5 may transmit a power generation operation start command to the fuel cell device 11 that has decided to newly start the power generation operation after the fuel cell device 11 has stopped power generation.

In the case of the interconnection operation illustrated in FIG. 10, the fuel cell device 11A of the fuel cell system 10A is in the power generation stop, the fuel cell device 11B of the fuel cell system 10B is in the power generation operation, and the fuel of the fuel cell system 10C. 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 during the power generation operation" is the "total of the power required to start the power generation operation of the fuel cell device 11A with the power generation stopped" and the "total of the power required to start the power generation operation of the fuel cell device 11A during the power generation operation". It is equal to or greater than the sum of the total maximum load power of the critical power load device 21 in the fuel cell systems 10B and 10C having the fuel cell devices 11B and 11C.

[Immediately after a power outage]
FIG. 11 is a diagram showing a state immediately after a power failure of the power system 1. In the figure, the parts where power is supplied are drawn with thick lines.
The control device 5 is a circuit breaker 4 of the power receiving facility 2 when the voltage of the power in the power system 1 detected by the voltage detector 3 is less than the set voltage, that is, when an abnormality such as a power failure occurs in the power system 1. The power line L (interconnection power line 6) is disconnected from the power system 1 by shutting off the circuit breaker 25, and the shared power load device 7 is disconnected from the interconnection power line 6 by shutting off the circuit breaker 25. A synchronization signal (for example, a 60 Hz signal) is sent to 11. In addition, the control device 5 instructs each fuel cell system 10 to generate power (self-sustaining operation) of the fuel cell device 11 at a predetermined output (for example, maximum generated power).

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

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

While the fuel cell device 11 is operating at the maximum generated power, surplus power is supplied to the interconnection power line 6. Then, the electric power is used for starting the power generation operation of the fuel cell device 11A in the fuel cell system 10A having the fuel cell device 11A in which power generation is stopped, which is also connected to the interconnection power line 6 (that is, the auxiliary machine 14). It is used for (load power). Since the circuit breaker 25 is shut off, power is not supplied to the shared power load device 7. Further, in the fuel cell system 10A having the fuel cell device 11A in which the power generation is stopped, since the fuel cell device 11A shuts off the self-supporting side breaker 19, power is 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 breaker 4 of the power receiving equipment 2, and the fuel during power generation operation. 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 from at least one of the fuel cell systems 10 having the fuel cell device 11 during power generation operation to the power line L. In the fuel cell system 10 having the fuel cell device 11 which is supplied and the power generation is stopped, the fuel cell device 11 is configured to start the power generation operation by consuming the electric power supplied from the power line L.

[During independent operation]
FIG. 12 is a diagram showing a state of the fuel cell device 11 during independent operation. In the figure, the parts where power is supplied are drawn with thick lines.
As shown in the figure, in all the fuel cell systems 10 including the fuel cell device 11A of the fuel cell system 10A whose power generation was stopped immediately after the power failure, the fuel cell device 11 performs power generation operation (self-sustaining operation). There is.
Further, since the fuel cell device 11A of the fuel cell system 10A, which had stopped power generation immediately after the power failure, connects and operates both the interconnection side circuit breaker 18 and the independent side circuit breaker 19, the generated power of the fuel cell device 11A. Is supplied to the internal power line 20 and is supplied to the terminal b of the switch 23. That is, in the fuel cell system 10A, after an abnormality occurs in the power system 1, the terminal b and the terminal c are connected in the switch 23, and the important power is generated from the fuel cell device 11A that is 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 system 1, sufficient power can be supplied from the fuel cell device 11 of each fuel cell system 10 to the critical power load device 21.

<Fifth Embodiment>
The fuel cell equipment of the fifth embodiment is different from the above-described embodiment in the power supply destination immediately after the power failure and during the independent operation. The fuel cell equipment of the fifth embodiment will be described below, but the description of the same configuration as that of 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 a state in which the fuel cell device 11 is in interconnection operation, FIG. 14 is a diagram showing a state immediately after a power failure of the power system 1, and FIG. 15 is a diagram showing a state of the fuel cell device 11 immediately after a power failure. It is a figure which shows the state in the 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. Then, the general power load device 22 can receive the power supply when the circuit breaker 26 is connected and operated, and cannot receive the power supply when the circuit breaker 26 is cut off. .. Further, the critical power load device 21 can receive power supply when the circuit breaker 26 is connected and operated, and when the circuit breaker 26 is connected and operated, the critical power load device 21 is connected to the terminal b of the switch 23. Power can be supplied only when power is supplied.

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

[During interconnection operation]
FIG. 13 is a diagram showing a state in which the fuel cell device 11 is in interconnection operation. In the figure, the parts where power is supplied are drawn with thick lines.
When the power supply from the power system 1 is normally performed, 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 facility 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. Then, when the power line L (interconnection power line 6) is connected to the power system 1 by connecting and operating the breaker 4 of the power receiving facility 2, the fuel cell device 11 is stopped in power generation. 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 the power supplied from the power line L (internal power line 20 and interconnect power line 6). can. That is, in the case of interconnection operation, at least one of the electric power supplied from the electric power system 1 and the electric power supplied from the fuel cell device 11 during the power generation operation is supplied to the electric power line L, so that electric 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 power generation of the fuel cell device 11 is stopped can operate. Further, the shared power load device 7 can also operate using the power supplied via the interconnection power line 6.

In the fuel cell equipment of the present embodiment, the total of the maximum generated power of the fuel cell device 11 during the power generation operation in the plurality of fuel cell systems 10 during the interconnection operation in which the power line L is connected to the power system 1 is generated. The total amount of electric power required to start the power generation operation of the fuel cell device 11 having the highest priority in the starting order among the stopped fuel cell devices 11 and the fuel cell system 10 having the fuel cell device 11 during the power generation operation. The fuel cell device 11 for power generation operation is determined so as to be equal to or greater than the sum of the total maximum load power of the critical power load device 21.

For example, in the case of FIG. 13, it is the fuel cell device 11A of the fuel cell system 10A and the fuel cell device 11C of the fuel cell system 10C that the power generation is stopped. The priority of the starting order is high for the fuel cell device 11A of the fuel cell system 10A and low for the fuel cell device 11C of the fuel cell system 10C. Therefore, in the fuel cell equipment of the present embodiment, the total maximum generated power of the fuel cell device 11B during the power generation operation in the plurality of fuel cell systems 10 during the interconnection operation in which the power line L is connected to the power system 1 is calculated. , 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) having the highest priority in the starting order among the fuel cell devices 11A and 11C whose power generation is stopped. The fuel cell device 11 for power generation operation is determined so as to be equal to or greater than the sum of the total maximum load power of the critical power load device 21B in the fuel cell system 10B having the fuel cell device 11B during power generation operation.

That is, even if an abnormality such as a power failure occurs in the power system 1 and the power line L (internal power line 20 and interconnected power line 6) is disconnected from the power system 1, the power line L is connected to the fuel cell device 11 during power generation operation. The total power required to start the power generation operation of the fuel cell device 11 (fuel cell device 11A of the fuel cell system 10A) having the highest priority in the starting order, and the fuel cell during the power generation operation. The number of operating fuel cell devices 11 is controlled during the interconnection operation so as to meet the power demand of the critical power load device 21 in the fuel cell system 10 having the device 11.

For example, when the control device 5 receives information that the fuel cell device 11 during the power generation operation is scheduled to stop power generation, the control device 5 "generates power" from the fuel cell device 11 which is in the power generation operation but is scheduled to stop power generation. "Total maximum generated power of the fuel cell device 11 during the power generation operation" and "Priority of the start order of the fuel cell devices 11 whose power generation is stopped" in the state of being regarded as "the stopped fuel cell device 11". Is the sum of the total power required to start the power generation operation of the fuel cell device 11 having the highest power generation and the total maximum load power of the critical power load device 21 in the fuel cell system 10 having the fuel cell device 11 during the power generation operation. To compare with. Then, in the control device 5, the "total of the maximum generated power of the fuel cell device 11 during the power generation operation" is "the fuel cell device 11 having the highest priority of the starting order among the fuel cell devices 11 whose power generation is stopped". If the sum of the total power required to start the power generation operation and the total maximum load power of the critical power load device 21 in the fuel cell system 10 having the fuel cell device 11 during the power generation operation is less than the sum, the power generation is stopped. Among the fuel cell devices 11 inside, one or a plurality of fuel cell devices 11 to newly start the power generation operation are determined, and before the fuel cell device 11 scheduled to stop the power generation actually stops the power generation, the fuel cell device 11 is determined. A command to start the power generation operation is transmitted to the fuel cell device 11 that has been newly determined to start the power generation operation. The control device 5 may transmit a power generation operation start command to the fuel cell device 11 that has decided to newly start the power generation operation after the fuel cell device 11 has stopped power generation.

In the case of the interconnection operation illustrated in FIG. 13, the fuel cell device 11A of the fuel cell system 10A is in the power generation stop, the fuel cell device 11B of the fuel cell system 10B is in the power generation operation, and the fuel of the fuel cell system 10C. The battery device 11C is shutting down power generation. In this state, the "total of the maximum generated power of the fuel cell device 11B during the power generation operation" is "the power generation of the fuel cell device 11A having the highest priority in the starting order among the fuel cell devices 11A and 11C during the power generation stop". It is the sum of the total power required to start the operation and the total maximum load power of the critical power load device 21B in the fuel cell system 10B having the fuel cell device 11B during the power generation operation.

[Immediately after a power outage]
FIG. 14 is a diagram showing a state immediately after a power failure of the power system 1. In the figure, the parts where power is supplied are drawn with thick lines.
The control device 5 is a circuit breaker 4 of the power receiving facility 2 when the voltage of the power in the power system 1 detected by the voltage detector 3 is less than the set voltage, that is, when an abnormality such as a power failure occurs in the power system 1. The power line L (interconnection power line 6) is disconnected from the power system 1 by shutting off the circuit breaker 25, and the shared power load device 7 is disconnected from the interconnection power line 6 by shutting off the circuit breaker 25. A synchronization signal (for example, a 60 Hz signal) is sent to 11.

The control device 5 connects and operates the breaker 27b so that the internal power line 20 of the fuel cell system 10B having the fuel cell device 11B during power generation operation and the interconnection power line 6 are connected, and also connects and operates the breaker 27b with respect to 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).

Further, the control device 5 connects and operates the breaker 27a so that the fuel cell device 11A having the highest priority in the starting order among the fuel cell devices 11A and 11C whose power generation is stopped can start the power generation operation. , The internal power line 20 of the fuel cell system 10A provided with the fuel cell device 11A and the interconnection power line 6 are connected. As a result, electric power is supplied to the internal power line 20 of the fuel cell system 10A.
On the other hand, the control device 5 shuts off the breaker 27c of the fuel cell system 10C provided with the fuel cell device 11C having a lower priority in the starting order among the fuel cell devices 11A and 11C whose power generation is stopped. , The internal power line 20 of the fuel cell system 10C is disconnected from the interconnection 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 power is supplied by connecting and operating the circuit breaker 27, for example, the circuit breaker 26 is shut off by a command from the battery control unit 15 of the fuel cell unit 12. As a result, the general power load device 22 included in the fuel cell system 10 to which the power is supplied cannot receive the power supply. As will be described later, in the fuel cell system 10 having the fuel cell device 11 during the power generation operation (self-sustaining operation), the electric power is supplied to the important power load device 21.
Further, in the fuel cell system 10 in which 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 critical power load device 21, and the general power load device 22. ..

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

While the fuel cell device 11B is operating at the maximum generated power, surplus power is supplied to the interconnection power line 6 via the circuit breaker 27. Then, the electric power is used for starting the power generation operation of the fuel cell device 11A in the fuel cell system 10A having the fuel cell device 11A in which power generation is stopped, which is also connected to the interconnection power line 6 (that is, the auxiliary machine 14). It is used for (load power). Since the circuit breaker 25 is shut off, power is not supplied to the shared power load device 7. Further, in the fuel cell system 10A having the fuel cell device 11A in which the power generation is stopped, since the fuel cell device 11A shuts off the self-supporting side breaker 19, power is 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 of the fuel cell device 11 during independent operation. In the figure, the parts 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, whose power generation was stopped immediately after the power failure, is performing power generation operation (self-sustaining operation). The fuel cell device 11C, which has a low priority in the starting order, does not perform power generation operation.

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

After that, the control device 5 connects and operates the breaker 27c so that the fuel cell device 11C having a low priority in the starting order can start the power generation operation, and the fuel cell system 10C provided with the fuel cell device 11C is operated. The internal power line 20 and the interconnection power line 6 are connected. As a result, electric 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 the power generation operation after that.

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 breaker 4 of the power receiving equipment 2, and the fuel during power generation operation. 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 from at least one of the fuel cell systems 10 having the fuel cell device 11 during power generation operation to the power line L. Among the fuel cell devices 11 that are supplied and the power generation is stopped, power is supplied from the power line L to the fuel cell system 10 having the fuel cell device 11 in order from the one having the highest priority in the starting order. 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 with reference to specific examples, but the configuration thereof 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 are disclosed in the present specification. The embodiment described is an example, and the embodiment of the present invention is not limited to this, and can be appropriately modified without departing from the object of the present invention.

The present invention can be used for fuel cell equipment capable of supplying the power required for a fuel cell system having a fuel cell device in which power generation is stopped.

1 Power system 2 Power receiving equipment 4 Circuit breaker 6 Interconnect 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 Interconnected 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 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 breaker.
A shared power load device is connected to the power line,
In the plurality of fuel cell systems during the interconnection operation in which the power line is connected to the power system, the total of the maximum generated power of the fuel cell device during the power generation operation is the power generation of the fuel cell device whose power generation is stopped. Power generation is equal to or greater than the sum of the total power required to start operation, the total maximum load power of the power load device in the plurality of fuel cell systems, and the maximum load power of the shared power load device. Determine 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 facility, and the power load device is used in the fuel cell system having the fuel cell device during power generation operation. Power is supplied to the power line from at least one of the fuel cell systems having the fuel cell device during power generation operation, and power is supplied to the power line, and the power generation is stopped. In the fuel cell system having the above, the fuel cell device starts the power generation operation by consuming the power supplied from the power line, and in the fuel cell system having the fuel cell device in which the power generation is stopped, the power is supplied from the power line. A fuel cell facility configured so that the power load device can operate by consuming the electric power to be generated, and the shared power load device can operate by consuming the electric power supplied from the power line. A fuel cell facility in which a power line to which a plurality of fuel cell systems 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 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.
In the plurality of fuel cell systems during the interconnection operation in which the power line is connected to the power system, the total of the maximum generated power of the fuel cell device during the power generation operation is the power generation of the fuel cell device whose power generation is stopped. The sum of the total power required to start the operation, the total maximum load power of the critical power load device in the plurality of fuel cell systems, and the maximum load power of the shared power load device, or more. Determine the fuel cell device to be operated for power generation,
When an abnormality occurs in the power system, the power line is disconnected from the power system by the breaker of the power receiving facility, and the important power load in the fuel cell system having the fuel cell device during power generation operation. The fuel cell in which 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 during power generation operation, and power generation is stopped. In the fuel cell system having the apparatus, the fuel cell apparatus starts the power generation operation by consuming the electric power supplied from the electric power line, and in the fuel cell system having the fuel cell apparatus in which the power generation is stopped, from the electric power line. A fuel cell facility configured so that the critical power load device can operate by consuming the supplied power, 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 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 breaker.
The power load device includes an important power load device and a general power load device.
In the plurality of fuel cell systems during the interconnection operation in which the power line is connected to the power system, the total of the maximum generated power of the fuel cell device during the power generation operation is the power generation of the fuel cell device whose power generation is stopped. The fuel cell device to be operated for power generation is determined so as to be equal to or greater than the sum of the total power required to start the operation and the total maximum load power of the critical 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 breaker of the power receiving facility, and the important power load in the fuel cell system having the fuel cell device during power generation operation. 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 during power generation operation, and the power generation is stopped. In the fuel cell system having the power line, the fuel cell device consumes the power supplied from the power line to start the power generation operation, and in the fuel cell system having the fuel cell device in which the power generation is stopped, the power is supplied from the power line. A fuel cell facility configured to consume power to operate the critical power load device. A fuel cell facility in which a power line to which a plurality of fuel cell systems 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 breaker.
The power load device includes an important power load device and a general power load device.
In the plurality of fuel cell systems during the interconnection operation in which the power line is connected to the power system, the total of the maximum generated power of the fuel cell device during the power generation operation is the power generation of the fuel cell device whose power generation is stopped. The power generation operation is performed so as to be equal to or greater than the sum of the total power required to start the operation and the total maximum load power of the critical power load device in the fuel cell system having the fuel cell device during the power generation operation. Determine 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 facility, and the important power load in the fuel cell system having the fuel cell device during power generation operation. 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 during power generation operation, and the power generation is stopped. The fuel cell system includes a fuel cell facility configured to consume electric power supplied from the electric power line so that the fuel cell apparatus starts power generation operation. A fuel cell facility in which a power line to which a plurality of fuel cell systems 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 breaker.
The power load device includes an important power load device and a general power load device.
In the plurality of fuel cell systems during the interconnection operation in which the power line is connected to the power system, the total of the maximum generated power of the fuel cell device during the power generation operation is among the fuel cell devices whose power generation is stopped. The total power required to start the power generation operation of the fuel cell device having the highest priority in the start-up order and the maximum load power of the critical power load device in the fuel cell system having the fuel cell device during the power generation operation. Determine the fuel cell device to be operated for power generation so that it is equal to or greater than the sum of the total.
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 facility, and the important power load in the fuel cell system having the fuel cell device during power generation operation. The fuel cell in which 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 during power generation operation, and power generation is stopped. Among the devices, power is supplied from the power line to the fuel cell system having the fuel cell device in order from the one having the highest priority of the start-up order, and the fuel cell device is configured to start power generation operation. Fuel cell equipment to be used. The power load device includes a critical power load device and a general power load device.
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 critical power load device via an independent output line. The fuel cell facility according to any one of claims 1 to 5.

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