JP2014175255A - Fuel cell power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel cell power generation system capable of suppressing an unnecessary stop of a fuel cell power generation device.SOLUTION: A fuel cell power generation system is configured such that, power generation control means 12 of a fuel cell power generation device 10 stops power generation operation of a fuel cell portion 11 unless it is determined that a linked operation is permitted with reference to linkage permission information transferred from a power load device 20 when performing a linked operation, and power supply from the fuel cell power generation device 10 to a power load device 20 via the independent power line 6 is started preferentially in time to an electric terminal 7 for an autonomous operation when the fuel cell power generation device 10 starts power supply to the independent power line 6.

Description

  The present invention relates to a fuel cell power generation system including a fuel cell power generation device.

  In Patent Literature 1, when the power supply from the fuel cell unit and the power system to the AC line is normally performed, a grid operation is performed to output the generated power of the fuel cell unit to the AC line. Power generation control configured to perform self-sustained operation to output the generated power of the fuel cell unit to a self-sustained power line that is electrically disconnected from the power system when the power supply from the power source to the AC line is not normally performed A fuel cell power plant having means is described. A fuel cell power generation system including this fuel cell power generation device includes an electrical outlet that receives power supply from the fuel cell power generation device via an independent power line in an abnormal state.

  In addition, when the power generator is operated in conjunction with an external power system, it is required to perform grid connection procedures for obtaining permission from the power company that manages the power system, that is, user identification processing. It is done. Patent Document 2 describes an example of a system that performs such user identification processing. Specifically, the system described in Patent Document 2 includes a power generation device (heat and power supply device) that is operated in conjunction with an electric power system, an operation control unit that controls the operation of the power generation device, and registration identification information ( That is, a memory for storing information indicating that it is permitted to perform the grid operation is provided.

JP 2008-108666 A JP 2006-158068 A

  Patent Document 2 does not describe the self-sustained operation without connecting the power generator to the power system. However, Patent Document 1 describes the power generator included in the system described in Patent Document 2. In addition, when the configuration is changed so that not only the interconnection operation but also the independent operation can be performed, it can be assumed that the following power generation device is obtained.

  In other words, the power generation device is configured to allow the autonomous operation to be performed even if the information indicating that the interconnection operation is permitted is not stored in the memory. This is because the power generator is not connected to the power system during the self-sustaining operation. Furthermore, when the power supply from the power system to the AC line is switched from an abnormal state to a normal state in a state where the power generation device is operating independently, whether or not the power generation device is permitted to perform a grid operation. Regardless of this, the system automatically switches to the interconnected operation first. Then, the power generator switches to the interconnected operation and determines whether or not the interconnected operation is permitted. As a result, if it can be determined that the power generation device is permitted to perform the grid operation, the power generation device maintains the power generation operation while switching to the grid operation. On the other hand, if it is not possible to determine that the power generation apparatus is permitted to perform the grid operation, the power generator stops the power generation operation after switching to the grid operation, and permits from the power company that manages the power system. Forcibly stop the connected operation that has not been received.

Even if information indicating that the interconnection operation is permitted is stored in the memory, the power generation device may be lost during the autonomous operation.
For example, the power that can be used when the power generator is operating independently is within the maximum generated power of the power generator. Then, when a power load equal to or greater than the maximum generated power is connected to the power generation device, for example, the power supply interruption is resumed after the power supply from the power generation device to the power load is stopped or stopped for a set time. Processing is performed. However, even if the supply of power from the power generator is resumed, the power supply interruption process is repeated as long as a power load equal to or greater than the maximum generated power of the power generator remains connected.

  When such power supply interruption processing is performed, power supply from the power generation device to the power load is not performed, and even if power supply from the power generation device and interruption are repeated, power supply from the power generation device to the power load is not performed. It takes place for a short period of time. Normally, the power stored in the capacitor is supplied to the memory or the like even if the power supply is stopped. For this reason, it is unlikely that information stored in the memory indicating that it is permitted to perform the interconnection operation is lost, but the power supply interruption process is performed or repeated and stored in the capacitor. If the charge gradually decreases and eventually the stored charge disappears, such information will be lost. And if the information indicating that it is permitted to perform the grid operation is lost, the power generator performs the grid operation when the power supply from the power system changes from the abnormal state to the normal state. Therefore, the operation of the power generator that has been switched to the grid operation is stopped. In particular, in a device such as a fuel cell power generation device in which the temperature inside the device greatly increases or decreases due to start / stop, there is a possibility that the internal components of the device may deteriorate when the fuel cell power generation device is started / stopped. In addition, once the fuel cell power generation device is stopped, a certain period of time is required to start the power generation operation again, which inconveniences the user of the fuel cell power generation device.

  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 power generation system capable of suppressing an unnecessary stop of the fuel cell power generation device.

In order to achieve the above object, the fuel cell power generation system according to the present invention has a characteristic configuration in which the fuel cell unit and the fuel are supplied to the AC line when the power supply from the power system to the AC line is in a normal state. The fuel cell is connected to the independent power line that is electrically disconnected from the power system when an abnormal state in which power supply from the power system to the AC line is not normally performed is performed. A fuel cell power generation device having power generation control means configured to perform a self-sustained operation for outputting the generated power of the battery unit;
A fuel cell power generation system comprising a self-sustaining operation electrical terminal that receives supply of power from the fuel cell power generation device via the independent power line in the abnormal state,
A power load device that receives power supply through the AC line in the normal state and receives power supply from the fuel cell power generation device through the independent power line in the abnormal state;
The power load device has a rechargeable battery, and both supply of power from the AC line to itself and supply of power from the fuel cell power generation device to the self through the stand-alone power line are stopped. And whether or not the fuel cell power generation device is permitted to perform the interconnection operation while receiving the supply of electric power. The system permission / rejection information is stored and the connection permission / rejection information is transmitted to the fuel cell power generator at a set timing,
The power generation control means of the fuel cell power generation device is permitted to perform the interconnection operation with reference to the interconnection permission information transmitted from the power load device during the interconnection operation. If it cannot be determined that the fuel cell unit is, the fuel cell unit is configured to stop the power generation operation,
When the fuel cell power generator starts to supply power to the independent power line, the supply of power from the fuel cell power generator via the independent power line is directed to the power load device rather than the electric terminal for independent operation. However, it is configured to start with priority over time.

According to the above characteristic configuration, every time the fuel cell power generator starts to supply power to the independent power line, power is preferentially supplied to the power load device, and the battery capacity of the rechargeable battery of the power load device increases. To do. Therefore, since the possibility that the battery capacity of the rechargeable battery becomes zero is reduced in the power load device, it is possible to avoid loss of connection permission / prohibition information that may occur when the battery capacity of the rechargeable battery becomes zero. In this feature configuration, the power generation control means of the fuel cell power generation device is permitted to perform the interconnection operation with reference to the interconnection permission information transmitted from the power load device when performing the interconnection operation. It is configured to stop the power generation operation of the fuel cell unit if it cannot be determined that it is present, but as described above, the interconnection permission information that can be generated when the battery capacity of the rechargeable battery becomes zero in the power load device Therefore, in the fuel cell power generation system having this characteristic configuration, it is possible to avoid the occurrence of an event that the fuel cell power generation device stops as soon as the operation is switched to the interconnection operation due to the loss of the interconnection permission / denial information.
Therefore, it is possible to avoid the problem that the deterioration of the fuel cell power generation device is advanced due to the unnecessary stop of the fuel cell power generation device, and the problem that the user is inconvenienced because the fuel cell power generation device is stopped unnecessarily. it can.

  Another characteristic configuration of the fuel cell power generation system according to the present invention is that, when the power generation control unit of the fuel cell power generation apparatus performs the independent operation, the power consumption by the power load device and the independent operation When the sum of the power consumption by the self-sustained power load device connected to the electrical terminal for the power supply exceeds the set upper limit power, the supply of power from the fuel cell unit to the self-sustained power line is stopped or stopped for a set time After that, the power supply interruption process for restarting the supply of power from the fuel cell unit to the independent power line is performed.

  According to the characteristic configuration described above, the power generation control unit of the fuel cell power generation apparatus performs the power supply interruption process, so that the fuel cell power generation apparatus can be prevented from being operated in an overload state. Even if the power supply interruption process is performed and the power supply from the fuel cell power generation device to the power load device via the independent power line is temporarily stopped, the connection permission / rejection information is determined by the battery capacity of the rechargeable battery. Continue to be held in the load device. In addition, when the power generation control means of the fuel cell power generation device performs or repeats the power supply interruption process, the battery capacity of the rechargeable battery of the power load device decreases, but the fuel cell power generation device starts supplying power to the independent power line. In the (resuming) stage, the supply of electric power from the fuel cell power generation apparatus via the independent power line is started with priority over the electric power load apparatus over the electric terminal for independent operation. Each time the fuel cell power generation device starts (restarts) the supply of power to the independent power line, power is preferentially supplied to the power load device, and the battery capacity of the rechargeable battery of the power load device increases. . Therefore, since the possibility that the battery capacity of the rechargeable battery becomes zero is reduced in the power load device, it is possible to avoid loss of connection permission / prohibition information that may occur when the battery capacity of the rechargeable battery becomes zero.

  Still another characteristic configuration of the fuel cell power generation system according to the present invention includes a delay circuit that delays the start of power supply in the middle of the independent power line from the fuel cell power generation device to the electric terminal for independent operation. When the fuel cell power generation device starts supplying power to the independent power line, the supply of power from the fuel cell power generation device via the independent power line is caused by the delay action by the delay circuit during the independent operation. It is in the point which is prioritized in terms of time with respect to the power load device over the electrical terminal.

  According to the above characteristic configuration, the delay circuit delays the start of power supply from the fuel cell power generator to the self-sustained operation electrical terminal, so that power supply from the fuel cell power generator to the self-sustained operation electrical terminal is not yet performed. While it is not started, power supply from the fuel cell power generation device to the power load device is preferentially performed. In the meantime, the battery capacity of the rechargeable battery of the power load device is effectively increased. As a result, after that, power supply from the fuel cell power generator to the electric terminal for independent operation is started, and the power generation control means of the fuel cell electric generator is connected to the power consumption by the power load device and the electric terminal for independent operation Even if the supply of power from the fuel cell unit to the stand-alone power line is stopped or stopped for a set time because the sum of the power consumption by the stand-alone power load device is equal to or greater than the set upper limit power Since the battery capacity of the rechargeable battery of the load device has increased previously, the possibility that the battery capacity of the rechargeable battery becomes zero in the power load device is reduced. That is, it is possible to reduce the possibility of loss of connection permission / denial information that may occur when the battery capacity of the rechargeable battery becomes zero.

Still another characteristic configuration of the fuel cell power generation system according to the present invention is that the self-sustained power line is connected to the power load device from the fuel cell power generation device, and the self-sustained operation from the fuel cell power generation device. A second independent power line connected to the electrical terminal for time,
When the power generation control means of the fuel cell power generation device starts supplying power from the fuel cell power generation device to the self-contained power line, the power generation control unit supplies power from the fuel cell power generation device to the first self-contained power line. The fuel cell power generator is configured to start with priority over the supply of power from the fuel cell power generator to the second independent power line.

  According to the above characteristic configuration, when the power generation control unit of the fuel cell power generation device starts supplying power from the fuel cell power generation device to the independent power line, the power generation control unit of the fuel cell power generation device supplies power to the first independent power line to which the power load device is connected. The supply is started with priority over the supply of power to the second independent power line to which the electric terminal for independent operation is connected. That is, power supply from the fuel cell power generation device to the power load device is preferentially performed while power supply from the fuel cell power generation device to the electric terminal for independent operation has not yet started. In the meantime, the battery capacity of the rechargeable battery of the power load device is effectively increased. As a result, after that, power supply from the fuel cell power generator to the electric terminal for independent operation is started, and the power generation control means of the fuel cell electric generator is connected to the power consumption by the power load device and the electric terminal for independent operation Even if the supply of power from the fuel cell unit to the stand-alone power line is stopped or stopped for a set time because the sum of the power consumption by the stand-alone power load device is equal to or greater than the set upper limit power Since the battery capacity of the rechargeable battery of the load device has increased previously, the possibility that the battery capacity of the rechargeable battery becomes zero in the power load device is reduced. That is, it is possible to reduce the possibility of loss of connection permission / denial information that may occur when the battery capacity of the rechargeable battery becomes zero.

  Yet another characteristic configuration of the fuel cell power generation system according to the present invention is that the power load device is an exhaust heat recovery device that recovers exhaust heat from the fuel cell power generation device.

  According to the above characteristic configuration, the exhaust heat recovery device can operate by receiving power supplied through an AC line when the fuel cell power generation device is operating in an interconnected manner, and the fuel cell power generation device Can operate by receiving the supply of electric power from the fuel cell power generator through the independent electric power line. In other words, the exhaust heat recovery device can recover the exhaust heat from the fuel cell power generation device both when the fuel cell power generation device is performing an interconnected operation and when the fuel cell power generation device is performing a self-sustaining operation. As a result, the fuel cell power generation apparatus in operation can be cooled to prevent the fuel cell power generation apparatus from overheating.

  Still another characteristic configuration of the fuel cell power generation system according to the present invention is that the electric terminal for independent operation is configured as an electrical outlet.

  According to the above characteristic configuration, various electrical devices can be attached to the electrical outlet that is the electrical terminal for independent operation. That is, in an abnormal state where power supply from the power system is not normally performed, a desired electrical device can be connected to an electrical outlet and used.

It is a figure which shows the structure of the fuel cell power generation system of 1st Embodiment. It is a figure which shows the example of an internal structure of the automatic power switching device of 1st Embodiment. It is a figure which shows the supply form of the electric power at the time of the interconnection | linkage in the fuel cell power generation system of 1st Embodiment, and a self-supporting. It is a figure which shows the structure of the fuel cell power generation system of 2nd Embodiment. It is a figure which shows the example of an internal structure of the automatic power switching device of 2nd Embodiment. It is a figure which shows the supply form of the electric power at the time of the interconnection | linkage in the fuel cell power generation system of 2nd Embodiment, and a self-supporting.

<First Embodiment>
The configuration of the fuel cell system according to the first embodiment will be described below with reference to the drawings.
FIG. 1 is a diagram showing the configuration of the fuel cell power generation system of the first embodiment. As shown in FIG. 1, the fuel cell power generation system includes a fuel cell power generation device 10, an exhaust heat recovery device 20 (corresponding to the “power load device” of the present invention), and an electrical outlet 7 (“electricity for self-sustaining operation” of the present invention). Corresponding to “terminal”).

  The fuel cell power generation apparatus 10 includes a fuel cell unit 11 and power generation control means 12. In addition, the fuel cell power generation apparatus 10 described in the present embodiment includes a power monitoring unit 13 and a storage unit 14.

  The fuel cell unit 11 includes a cell stack in which a plurality of cells each having an anode to which a fuel gas such as hydrogen is supplied and a cathode to which oxygen is supplied are stacked. The fuel cell unit 11 can be configured using various types of cells such as a solid polymer cell and a solid oxide cell. The fuel cell unit 11 may also include a fuel gas generation device that generates fuel gas by steam reforming of hydrocarbons or alcohols.

  The electric power generated in the fuel cell unit 11 is output to one of the interconnection power line 5 and the independent power line 6 via a power converter (not shown) such as an inverter. It can be said that the state in which generated power is supplied from the fuel cell unit 11 to the interconnection power line 5 is a state in which the fuel cell power generation apparatus 10 is performing interconnection operation. On the other hand, it can be said that the state in which the generated power is supplied from the fuel cell unit 11 to the self-supporting power line 6 is a state in which the fuel cell power generation device 10 is performing self-supporting operation. The interconnection power line 5 is connected to the AC line 2 connected to the power system 1, and the AC line 2 is connected to the automatic power switch 3. The independent power line 6 is connected to the automatic power switch 3 separately from the AC line 2. As will be described later with reference to FIG. 3, the automatic power supply switching unit 3 supplies power to the exhaust heat recovery device 20 and the electrical outlet 7 as power supplied via the AC line 2 and the independent power line 6. It operates to automatically switch to any of the power supplied via the.

The power generation control means 12 of the fuel cell power generation apparatus 10 performs a linked operation for outputting the generated power of the fuel cell unit 11 to the AC line 2 when the power supply from the power system 1 to the AC line 2 is normally performed. When the power supply from the power system 1 to the AC line 2 is not normally performed, the self-sustained operation of outputting the generated power of the fuel cell unit 11 to the self-supported power line 6 electrically disconnected from the power system 1 is performed. Perform the switching process to be performed. In the present embodiment, the power generation control unit 12 is in a normal state in which power supply from the power system 1 to the AC line 2 is normally performed, or power supply from the power system 1 to the AC line 2 is performed normally. It is determined based on the monitoring result of the power monitoring means 13 whether it is an abnormal state. For example, the power monitoring unit 13 detects the voltage of power on the AC line 2 that is electrically connected to the power system 1. Then, if the detected voltage value is equal to or higher than the set lower limit voltage, the power generation control means 12 determines that the power supply from the power system 1 to the AC line 2 is normally performed and is detected. If the voltage value is less than the set voltage, it is determined that the power supply from the power system 1 to the AC line 2 is not in an abnormal state.
The storage unit 14 of the fuel cell power generation apparatus 10 stores various information handled by the fuel cell power generation apparatus 10.

  The exhaust heat recovery device 20 is configured to recover the exhaust heat from the fuel cell power generation device 10. For example, the exhaust heat recovery means 22 included in the exhaust heat recovery device 20 recovers heat of cooling water that cools the cell stack of the fuel cell unit 11 (that is, recovers exhaust heat from the fuel cell unit 11), The recovered heat is stored in a heat storage device or the like. In other words, the exhaust heat recovery means 22 includes a cooling water, a circulation path of a heat medium that exchanges heat with the cooling water, an electric pump that is provided in the middle of the circulation path of the heat medium and causes the heat medium to flow, It consists of a solenoid valve, a heat storage device that stores the recovered heat, and the like. Accordingly, in the exhaust heat recovery device 20, in order to cool the cell stack of the fuel cell unit 11, the fuel cell power generation device 10 is operated during the interconnection operation and during the independent operation. Then, it is necessary to operate the exhaust heat recovery means 22 to recover the exhaust heat, and as a result, power is consumed. Power supply from the outside to the exhaust heat recovery device 20 is performed through a power supply line 32 connected to the exhaust heat recovery device 20.

  The exhaust heat recovery apparatus 20 includes a rechargeable battery 21 such as an electrolytic capacitor (capacitor), supplies power to itself via the AC line 2, the automatic power switch 3 and the power supply line 32, and fuel. When any of the supply of power from the battery power generation apparatus 10 to the self-powered line 6, the automatic power supply switching unit 3, and the power supply line 32 is stopped, the battery power supply device 10 receives the supply of power from the rechargeable battery 21 and operates. It is configured as follows. In addition, the exhaust heat recovery device 20 stores connection permission information on whether or not the fuel cell power generation device 10 is permitted to perform a connection operation while receiving power supply, and The system permission / rejection information is transmitted to the fuel cell power generator 10 at a set timing.

This interconnection permission information is obtained when the grid interconnection procedure for obtaining permission from the electric power company when operating the electric power system 1 managed by the electric power company or the like by connecting the power source such as the fuel cell power generation device 10 or the like. It is information used to determine whether or not it is properly performed. For example, the exhaust heat recovery control means 23 of the exhaust heat recovery apparatus 20 determines whether or not the user of the fuel cell power generation apparatus 10 is a legitimate user permitted to perform the grid operation at a predetermined user authentication timing. Such authentication processing, for example, authentication processing for determining whether or not the password is valid is requested. Then, the exhaust heat recovery control means 23 determines whether or not the input code number is valid, and the storage means 24 determines whether or not the input code number and the code number are valid. Remember me. The exhaust heat recovery device 20 and the fuel cell power generation device 10 are connected by a communication line (not shown), and the connection permission / rejection from the exhaust heat recovery device 20 to the fuel cell power generation device 10 is permitted at a set timing via the communication line. Information is communicated. Therefore, in the present embodiment, the information indicating whether or not the input password is valid corresponds to the “linkage permission / denial information” of the present invention.
In the fuel cell power generation device 10, the power generation control unit 12 stores the connection permission / rejection information transmitted from the exhaust heat recovery device 20 in the storage unit 14.

  In the system shown in FIG. 1, a general power load device 4 and a self-supporting power load device 9 are described. The general power load device 4 is electrically connected to the AC line 2 connected to the power system 1. Therefore, the general power load device 4 can receive power supply in a normal state in which power supply from the power system 1 to the AC line 2 is normally performed, but power supply from the power system 1 to the AC line 2 is possible. The power supply cannot be received in an abnormal state where the operation is not normally performed. Therefore, the general power load device 4 referred to in the present embodiment is a device (for example, a part of lighting devices) that is unlikely to receive power supply in an abnormal state.

  On the other hand, as will be described later, the self-sustained power load device 9 receives power supply from the fuel cell power generation device 10 in an abnormal state in which power supply from the power system 1 to the AC line 2 is not normally performed. be able to. The power is supplied to the self-sustained power load device 9 because the power is supplied to the power supply line 31 and the electrical outlet 7 via the automatic power switch 3, and the electrical plug 8 is connected to the electrical outlet 7. Is when connected. The self-sustained power load device 9 is a highly important device that the user wants to use even in an abnormal state where the power supply from the power system 1 to the AC line 2 is not normally performed (for example, some lighting devices) , Refrigerator, etc.). The fuel cell power generation system according to the present embodiment supplies power in the middle of the power supply line 31 from the fuel cell power generation apparatus 10 to the electrical outlet 7, that is, between the automatic power switch 3 and the electrical outlet 7. A delay circuit 30 for delaying the start of. As the delay circuit 30, a known electric circuit can be used.

  FIG. 2 is a diagram illustrating an internal configuration example of the automatic power switch 3 according to the first embodiment. In particular, FIG. 2 (a) shows an electric circuit built inside the automatic power supply switching unit 3 when the fuel cell power generation device 10 is connected to the system, and FIG. 2 (b) shows the fuel cell power generation device. 10 shows an electric circuit constructed inside the automatic power supply switching unit 3 when a self-sustaining operation is performed at 10.

  As shown in FIGS. 2A and 2B, the AC line 2, the independent power line 6, the power supply line 31, and the power supply line 32 are drawn into the automatic power switch 3 of the present embodiment. Yes. For example, they are connected to a terminal block or the like that the automatic power switch 3 has inside, but the description of the terminal block and the like is omitted in FIG. The relay switch 36 provided inside the automatic power supply switching unit 3 has three terminals 36a, 36b, and 36c. The state in which the terminals 36a and 36b are connected to each other, and the connection between the terminals 36a and 36c are connected. It is switched to one of the states that have been made. The power supply line 32 connected to the exhaust heat recovery apparatus 20 is connected to the terminal 36a. The AC line 2 is connected to the terminal 36b. The self-supporting power line 6 is connected to the terminal 36c. In addition, a relay switch 34 is provided in the middle of the AC line 2 inside the automatic power switch 3. The relay switch 34 has terminals 34a and 34b, and is switched between a state where the terminals 34a and 34b are connected and a state where the terminals 34a and 34b are disconnected. In addition, a relay coil 33 and a relay coil 35 are provided in the middle of the independent power line 6 inside the automatic power switch 3. When an electric current flows through the relay coil 33 and an electromagnetic force is generated, the electromagnetic force acts on the relay switch 34. When a current flows through the relay coil 35 and an electromagnetic force is generated, the electromagnetic force acts on the relay switch 36.

  Next, referring to FIG. 2 (a) and FIG. 2 (b), automatic power supply switching when the fuel cell power generation apparatus 10 is connected and when the autonomous operation is performed is performed. The state inside the container 3 will be described. In FIG. 2A and FIG. 2B, a portion where power is supplied is drawn with a thick line, and a portion where power is not supplied is drawn with a thin line.

  As shown in FIG. 2A, when the interconnection operation is performed in the fuel cell power generation apparatus 10, current flows through the AC line 2, but current does not flow through the independent power line 6. In this state, the electromagnetic force does not act on the relay switches 34 and 36 because no electromagnetic force is generated in the relay coils 33 and 35 provided in the middle of the independent power line 6. As a result, the relay switch 34 switches to a state where the terminals 34a and 34b are connected, and the relay switch 36 switches to a state where the terminals 36a and 36b are connected. Then, the current flowing through the AC line 2 flows through the relay switch 34 and the relay switch 36 to the power supply line 32, whereby power is supplied to the exhaust heat recovery device 20.

  On the other hand, as shown in FIG. 2 (b), when the fuel cell power generation device 10 is operating independently, current flows through the independent power line 6, but current does not flow through the AC line 2. . In this state, electromagnetic force is generated in the relay coils 33 and 35 provided in the middle of the independent power line 6, and the electromagnetic force acts on the relay switches 34 and 36. As a result, the relay switch 34 is switched to a state where the terminals 34a and 34b are disconnected, and the relay switch 36 is switched to a state where the terminals 36a and 36c are connected. And the electric power supply to the exhaust-heat recovery apparatus 20 is performed because the electric current which flows into the self-supporting electric power line 6 flows into the electric power feeding line 32 through the relay switch 36. FIG. Further, a current also flows through the feeder line 31 branched from the self-supporting power line 6, and as a result, power is also supplied to the electrical outlet 7 connected to the feeder line 31.

Next, the power supply form at the time of interconnection and independence will be described.
FIG. 3 is a diagram showing a power supply form at the time of interconnection and self-supporting. Specifically, FIG. 3A is a diagram showing a power supply form when the fuel cell power generation device 10 is performing a grid-connected operation, and FIG. 3B is a diagram illustrating the fuel cell power generation device 10 that is operating independently. It is a figure which shows the supply form of the electric power when performing. In FIGS. 3A and 3B, the description of the internal configuration of the automatic power switch 3 (ie, the configuration shown in FIG. 2) is omitted for the sake of simplicity. In FIGS. 3A and 3B, a portion where power is supplied is drawn with a thick line, and a portion where power is not supplied is drawn with a thin line.

  As shown in FIG. 3 (a), when the fuel cell power generation device 10 is performing the interconnection operation, the power generation control means 12 of the fuel cell power generation device 10 sends the generated power of the fuel cell unit 11 to the interconnection power line 5. To the AC line 2, and the power generated by the fuel cell unit 11 is not supplied to the independent power line 6. In addition, as shown in FIG. 2A, the automatic power switch 3 constructs an electric circuit in which the AC line 2, the power supply line 32, and the exhaust heat recovery device 20 are electrically connected. At the same time, the automatic power switch 3 electrically disconnects the AC line 2 and the power supply line 31 and constructs an electric circuit in which power is not supplied to the power supply line 31. As a result, at least one of the power supplied from the power system 1 to the AC line 2 and the power supplied from the fuel cell power generator 10 to the AC line 2 with respect to the general power load device 4 and the exhaust heat recovery device 20. Will be supplied.

  As shown in FIG. 3 (b), when the fuel cell power generation device 10 is performing a self-sustained operation, the power generation control means 12 of the fuel cell power generation device 10 supplies the power generated by the fuel cell unit 11 to the independent power line 6. The power generated by the fuel cell unit 11 is not supplied to the interconnection power line 5. In addition, as shown in FIG. 2B, the automatic power switch 3 constructs an electric circuit in which the self-supporting power line 6, the power supply line 32, and the exhaust heat recovery device 20 are electrically connected. As a result, power is supplied to the exhaust heat recovery apparatus 20 from the fuel cell power generation apparatus 10 via the self-supporting power line 6 and the power supply line 32. At the same time, power is also supplied to the feeder line 31 branched from the self-supporting power line 6. In this case, since electric power is supplied to the electrical outlet 7 connected to the power supply line 31, the user of the independent power load device 9 can connect the electrical plug 8 to which the independent power load device 9 is connected. Can be supplied to the self-sustained power load device 9.

  However, in the fuel cell power generation system, when the fuel cell power generation apparatus 10 starts to supply power to the independent power line 6, the supply of power from the fuel cell power generation apparatus 10 through the independent power line 6 is discharged from the electrical outlet 7. The heat recovery apparatus 20 is configured to start with priority in time. Specifically, a delay circuit that delays the start of power supply in the middle of the power supply line 31 from the fuel cell power generator 10 to the electrical outlet 7, that is, between the automatic power switch 3 and the electrical outlet 7. 30. As a result, even if power supply from the fuel cell power generation apparatus 10 to the independent power line 6 is started, the delay of the delay circuit 30 delays the start of power supply from the fuel cell power generation apparatus 10 to the electrical outlet 7, While power supply from the fuel cell power generation device 10 to the electrical outlet 7 has not yet started, power supply from the fuel cell power generation device 10 to the exhaust heat recovery device 20 is preferentially performed.

As shown in FIG. 3 (a), when the fuel cell power generation apparatus 10 is performing a grid-connected operation, the AC line 2 is also supplied with power from the power system 1, so that the general power load apparatus 4 The power consumption may exceed the power that the fuel cell power generation apparatus 10 supplies to the interconnection power line 5. On the other hand, as shown in FIG. 3B, when the fuel cell power generation apparatus 10 is performing a self-sustained operation, the self-sustained power line 6 is not supplied with power from the power system 1. Therefore, the power generation control means 12 of the fuel cell power generation apparatus 10 consumes power consumed by the exhaust heat recovery apparatus 20 and power consumed by the independent power load apparatus 9 connected to the electrical outlet 7 during the independent operation. Is equal to or greater than the set upper limit power, the supply of power from the fuel cell unit 11 to the independent power line 6 is stopped, or the supply of power from the fuel cell unit 11 to the independent power line 6 after being stopped for a set time. The power supply interruption process is resumed. By this power supply interruption process, it is possible to avoid the fuel cell power generation apparatus 10 being operated in an overload state.
That is, in this embodiment, the power generation control means 12 of the fuel cell power generation apparatus 10 monitors the load side (that is, the sum of the power consumption of the exhaust heat recovery apparatus 20 and the independent power load apparatus 9 is the set upper limit power. The power supply interruption process performed by monitoring whether or not this is the case and the power system 1 side are monitored (that is, whether the power supply from the power system 1 is normal or abnormal). And) the switching process for switching between the interconnected operation and the independent operation is performed in parallel.

  When the supply of power from the fuel cell power generation device 10 to the exhaust heat recovery device 20 is interrupted by the power supply interruption processing being performed in the fuel cell power generation device 10 during the self-sustaining operation, the inside of the exhaust heat recovery device 20 An electric device (for example, a microcomputer or the like for realizing the exhaust heat recovery control means 23) operates with electric power supplied from the rechargeable battery 21. As a result, the battery capacity of the rechargeable battery 21 of the exhaust heat recovery apparatus 20 monotonously decreases while the power supply interruption process is being performed in the fuel cell power generation apparatus 10.

  In such a state, when the power generation control unit 12 of the fuel cell power generation apparatus 10 resumes the supply of power from the fuel cell unit 11 to the independent power line 6, it is connected to the independent power line 6 via the automatic power switch 3. The supply of power to the power supply line 32 and the exhaust heat recovery device 20 that have been performed and the supply of power to the power supply line 31 connected to the self-supporting power line 6 via the automatic power switch 3 are resumed simultaneously. The However, a delay circuit 30 is interposed in the middle of the power supply line 31, and the start of power supply from the fuel cell power generation apparatus 10 to the electrical outlet 7 is delayed. That is, due to the delay action by the delay circuit 30, the supply of electric power from the fuel cell power generation apparatus 10 via the self-standing power line 6 is started with priority over the exhaust heat recovery apparatus 20 with respect to time rather than the electrical outlet 7. Therefore, power supply from the fuel cell power generation device 10 to the exhaust heat recovery device 20 is preferentially performed while power supply from the fuel cell power generation device 10 to the electrical outlet 7 has not yet been started, and the exhaust heat recovery device. The battery capacity of the 20 rechargeable batteries 21 is effectively increased.

  Thereafter, power supply from the fuel cell power generation device 10 to the electrical outlet 7 is started. However, the power consumption by the exhaust heat recovery device 20 and the power consumption by the independent power load device 9 connected to the electrical outlet 7 If the sum remains equal to or higher than the set upper limit power, the power generation control unit 12 of the fuel cell power generation apparatus 10 again stops the supply of power from the fuel cell unit 11 to the independent power line 6 or stops for a set time. Therefore, the electric capacity of the rechargeable battery 21 of the exhaust heat recovery apparatus 20 tends to decrease again.

  As described above, when the fuel cell power generation device 10 is operating independently, the sum of the power consumption by the exhaust heat recovery device 20 and the power consumption by the independent power load device 9 connected to the electrical outlet 7 is As long as the power exceeds the set upper limit power, the supply and stop of power from the fuel cell power generator 10 are alternately repeated in the exhaust heat recovery device 20 and the electrical outlet 7. However, even if the supply and stop of power to the exhaust heat recovery device 20 are alternately repeated, the power supply from the fuel cell power generation device 10 to the electrical outlet 7 is still started by the delay action of the delay circuit 30 described above. In the meantime, the power supply from the fuel cell power generator 10 to the exhaust heat recovery device 20 is preferentially performed, and the battery capacity of the rechargeable battery 21 of the exhaust heat recovery device 20 is effectively increased. As a result, in the exhaust heat recovery device 20, the possibility that the battery capacity of the rechargeable battery 21 becomes zero is low, and the loss of the interconnection permission information that can occur when the battery capacity of the rechargeable battery 21 becomes zero. Less likely.

  On the other hand, if the fuel cell power generation system does not include the delay circuit 30 as in the present embodiment, the battery of the rechargeable battery 21 while the power supply interruption process is repeated in the fuel cell power generation apparatus 10. The capacity gradually decreases, and eventually the battery capacity of the rechargeable battery 21 may become zero. Then, when the battery capacity of the rechargeable battery 21 becomes zero, for example, information stored in the storage unit 24 is lost. Further, for example, connection permission / rejection information (information on whether or not the inputted personal identification number is valid) stored in the storage unit 24 of the exhaust heat recovery apparatus 20 indicates that the battery capacity of the rechargeable battery 21 is zero. If it is lost, the connection permission / prohibition information “not allowed to perform connection operation” is transmitted from the exhaust heat recovery device 20 to the fuel cell power generation device 10. In this case, if the interconnection operation is started while the interconnection permission / denial information “not permitted to perform interconnection operation” is stored in the storage unit 14 of the fuel cell power generation device 10, The power generation control unit 12 stops the operation of the fuel cell unit 11. As a result, there arises a problem that the deterioration of the fuel cell power generation device 10 proceeds, and a problem that the user is inconvenienced due to the fuel cell power generation device 10 being stopped unnecessarily.

  As described above, power is given priority to the exhaust heat recovery device 20 every time the fuel cell power generation device 10 starts supplying power to the independent power line 6 regardless of whether or not the power supply interruption processing is performed. Thus, the battery capacity of the rechargeable battery 21 of the exhaust heat recovery device 20 is increased. Accordingly, since the possibility that the battery capacity of the rechargeable battery 21 becomes zero is reduced in the exhaust heat recovery device 20, the loss of connection permission / prohibition information that may occur when the battery capacity of the rechargeable battery 21 becomes zero is reduced. Can be avoided. In the present embodiment, when the power generation control means 12 of the fuel cell power generation apparatus 10 performs the interconnection operation, the interconnection operation is performed by referring to the interconnection permission / denial information transmitted from the exhaust heat recovery apparatus 20. If it cannot be determined that the battery is permitted, the power generation operation of the fuel cell unit 11 is stopped. However, as described above, when the battery capacity of the rechargeable battery 21 becomes zero in the exhaust heat recovery device 20 In the fuel cell power generation system according to the present embodiment, the loss of the interconnection permission / prohibition information that may occur in the first embodiment is stopped as soon as the fuel cell power generation device 10 is switched to the interconnection operation due to the loss of the interconnection permission / rejection information. Occurrence of an event such as Therefore, it is possible to avoid the problem that the fuel cell power generation device 10 is deteriorated due to the unnecessary stop of the fuel cell power generation device 10, and to inconvenience the user because the fuel cell power generation device 10 is stopped unnecessarily. Problems can also be avoided.

Second Embodiment
The fuel cell power generation system of the second embodiment is different from the first embodiment in the configuration of the self-supporting power line. The fuel cell power generation system of the second embodiment will be described below, but the description of the same configuration as that of the first embodiment will be omitted.

  FIG. 4 is a diagram showing the configuration of the fuel cell power generation system of the second embodiment. FIG. 5 is a diagram illustrating an internal configuration example of the automatic power switch 3 according to the second embodiment. In particular, FIG. 5 (a) shows an electric circuit built inside the automatic power supply switching unit 3 when the fuel cell power generation device 10 is connected, and FIG. 5 (b) shows the fuel cell power generation device. 10 shows an electric circuit constructed inside the automatic power supply switching unit 3 when a self-sustaining operation is performed at 10.

  As shown in FIGS. 4 and 5, in the fuel cell power generation system of the second embodiment, the independent power line 6 includes a first independent power line 6 a and a second independent power line 6 b. Further, as shown in FIGS. 5A and 5B, the automatic power switch 3 of the present embodiment has an AC line 2, an independent power line 6 (6 a, 6 b), a power supply line 31, and a power supply 31. The electric wire 32 is drawn. For example, they are connected to a terminal block or the like that the automatic power switch 3 has inside, but the description of the terminal block and the like is omitted in FIG. In the form shown in FIG. 2, the power supply line 31 is also connected to the self-supporting power line 6 connected to the relay switch 36. However, in this embodiment, the power supply line 31 is connected to the relay switch 36 as shown in FIG. The first independent power line 6a and the second independent power line 6b connected to the feeder line 31 are independent. The relay switch 36 provided inside the automatic power supply switching unit 3 has three terminals 36a, 36b, and 36c. The state in which the terminals 36a and 36b are connected to each other, and the connection between the terminals 36a and 36c are connected. It is switched to one of the states that have been made. The power supply line 32 connected to the exhaust heat recovery apparatus 20 is connected to the terminal 36a. The AC line 2 is connected to the terminal 36b. The first free standing power line 6a is connected to the terminal 36c. In addition, a relay switch 34 is provided in the middle of the AC line 2 inside the automatic power switch 3. The relay switch 34 has terminals 34a and 34b, and is switched between a state where the terminals 34a and 34b are connected and a state where the terminals 34a and 34b are disconnected. In addition, a relay coil 33 and a relay coil 35 are provided in the middle of the first independent power line 6a inside the automatic power switch 3. When an electric current flows through the relay coil 33 and an electromagnetic force is generated, the electromagnetic force acts on the relay switch 34. When a current flows through the relay coil 35 and an electromagnetic force is generated, the electromagnetic force acts on the relay switch 36. The power supply line 31 is connected to the second independent power line 6b.

  Next, referring to FIG. 5 (a) and FIG. 5 (b), automatic power supply switching when the fuel cell power generation apparatus 10 is connected and when the autonomous operation is performed is performed. The state inside the container 3 will be described. In FIG. 5A and FIG. 5B, a portion where power is supplied is drawn with a thick line, and a portion where power is not supplied is drawn with a thin line. Even in this embodiment, the power generation control means 12 of the fuel cell power generation apparatus 10 generates power generated by the fuel cell unit 11 in the AC line 2 when the power supply from the power system 1 to the AC line 2 is normally performed. When the power supply from the power system 1 to the AC line 2 is not normally performed, the fuel is supplied to the independent power lines 6 (6a, 6b) that are electrically disconnected from the power system 1. A switching process for performing a self-sustaining operation for outputting the generated power of the battery unit 11 is performed.

  As shown in FIG. 5 (a), when interconnection operation is performed in the fuel cell power generation apparatus 10, current flows through the AC line 2, but current flows through the independent power lines 6 (6a, 6b). Absent. In this state, the electromagnetic force does not act on the relay switches 34 and 36 because no electromagnetic force is generated in the relay coils 33 and 35 provided in the middle of the first independent power line 6a. As a result, the relay switch 34 switches to a state where the terminals 34a and 34b are connected, and the relay switch 36 switches to a state where the terminals 36a and 36b are connected. Then, the current flowing through the AC line 2 flows through the relay switch 34 and the relay switch 36 to the power supply line 32, whereby power is supplied to the exhaust heat recovery device 20.

  On the other hand, as shown in FIG. 5 (b), when the fuel cell power generation device 10 is operating independently, current flows through the independent power lines 6 (6 a, 6 b), but the AC line 2 No current is flowing. In this state, electromagnetic force is generated in the relay coils 33 and 35 provided in the middle of the first independent power line 6a, and the electromagnetic force acts on the relay switches 34 and 36. As a result, the relay switch 34 is switched to a state where the terminals 34a and 34b are disconnected, and the relay switch 36 is switched to a state where the terminals 36a and 36c are connected. And the electric power supply to the exhaust-heat recovery apparatus 20 is performed because the electric current which flows into the 1st self-supporting electric power line 6a flows into the electric power feeding line 32 through the relay switch 36. FIG. Further, a current also flows through the power supply line 31 connected to the second independent power line 6 b, and as a result, power is also supplied to the electrical outlet 7 connected to the power supply line 31.

Next, the power supply form at the time of interconnection and independence will be described.
FIG. 6 is a diagram illustrating a power supply form at the time of interconnection and self-supporting. Specifically, FIG. 6A is a diagram showing a power supply form when the fuel cell power generation apparatus 10 is performing a grid-connected operation, and FIG. 6B is a diagram showing the fuel cell power generation apparatus 10 operating independently. It is a figure which shows the supply form of the electric power when performing. In FIG. 6A and FIG. 6B, the description of the internal configuration of the automatic power switch 3 (that is, the configuration shown in FIG. 5) is omitted for simplification of the drawing. Further, in FIGS. 6A and 6B, a portion where power is supplied is drawn with a thick line, and a portion where power is not supplied is drawn with a thin line.

  In the present embodiment, the power generation control means 12 of the fuel cell power generator 10 starts the first self-sustained operation from the fuel cell power generator 10 when starting the supply of power from the fuel cell power generator 10 to the independent power lines 6 (6a, 6b). The supply of power to the power line 6a is started with priority over the supply of power from the fuel cell power generator 10 to the second independent power line 6b.

  As described above, when the power generation control means 12 of the fuel cell power generation apparatus 10 starts supplying power from the fuel cell power generation apparatus 10 to the self-supporting power lines 6 (6a, 6b), the exhaust heat recovery apparatus 20 is connected. The supply of power to the first independent power line 6a to be started is prioritized over the supply of power to the second independent power line 6b to which the feeder line 31 and the electrical outlet 7 are connected. That is, power supply from the fuel cell power generation device 10 to the exhaust heat recovery device 20 is preferentially performed while power supply from the fuel cell power generation device 10 to the power supply line 31 and the electrical outlet 7 has not yet started. Therefore, the battery capacity of the rechargeable battery 21 of the exhaust heat recovery device 20 is effectively increased during that time. As a result, thereafter, power supply from the fuel cell power generation device 10 to the power supply line 31 and the electrical outlet 7 is started, and the power generation control means 12 of the fuel cell power generation device 10 uses the power consumption by the exhaust heat recovery device 20 and the electrical outlet. The power supply from the fuel cell unit 11 to the independent power lines 6 (6a, 6b) is set for a set time because the sum of the power consumption by the independent power load device 9 connected to 7 is equal to or higher than the set upper limit power. Even if it is stopped during this period, since the battery capacity of the rechargeable battery 21 of the exhaust heat recovery device 20 has increased previously, it is unlikely that the battery capacity of the rechargeable battery 21 will be zero in the exhaust heat recovery device 20. Become. That is, the possibility of loss of the interconnection permission / prohibition information that may occur when the battery capacity of the rechargeable battery 21 becomes zero is reduced. As a result, legitimate interconnection permission information is transmitted from the exhaust heat recovery apparatus 20 to the fuel cell power generation apparatus 10 at the set timing, and the operation of the fuel cell power generation apparatus 10 loses the connection permission information. It is possible to avoid being stopped unnecessarily due to the cause.

<Another embodiment>
<1>
In the said embodiment, although the specific example was given and demonstrated about the structure of the fuel cell power generation system, the structure can be changed suitably.
For example, although the case where the exhaust heat recovery device 20 shown in the above embodiment is the power load device according to the present invention has been described, the function of the power load device according to the present invention may be provided to another device.
In the above embodiment, the configuration example of the electric circuit inside the automatic power switch 3 has been described with reference to the drawings. However, the configuration of the electric circuit can be changed as appropriate.

  In addition, in the above-described embodiment, the example in which the power monitoring unit 13 refers to the voltage of the power to determine whether the power supply from the power system 1 is in a normal state or an abnormal state has been described. It is also possible to determine whether the power supply from the power system 1 is in a normal state or an abnormal state by another index. For example, the time interval of the zero cross point of the AC voltage of the AC line 2 monitored by the power monitoring unit 13 can be used as an index. When the frequency of the AC voltage is 60 Hz, a zero cross point is detected every half cycle of the AC voltage, that is, about every 8 msec. Therefore, after the zero cross point is detected, for example, if the next zero cross point cannot be detected even after 9 msec, it can be determined that the power system 1 is in an abnormal state. On the other hand, after the zero cross point is detected, for example, when the next zero cross point can be detected before 9 msec elapses, it can be determined that the power system 1 is in a normal state.

<2>
In the above-described embodiment, the interconnection means permission / rejection information (information on whether or not the input password is valid, that is, whether or not the interconnection operation is permitted) is stored in the storage unit 24 of the exhaust heat recovery apparatus 20. In this example, when the battery capacity of the rechargeable battery 21 becomes zero, the connection permission / rejection information is lost from the storage unit 24. However, another information is stored in the storage unit 24. May be stored.
For example, the storage means 24 of the exhaust heat recovery apparatus 20 stores the CO ₂ reduction amount achieved by operating the fuel cell power generation apparatus 10 and the exhaust heat recovery apparatus 20 (for example, the fuel cell power generation apparatus 10 and the exhaust heat recovery apparatus 20 It is also possible to store information relating to comparison with the case where electricity and heat are generated without driving.

  The present invention can be used for a fuel cell power generation system capable of suppressing unnecessary deterioration of the fuel cell power generation apparatus.

DESCRIPTION OF SYMBOLS 1 Electric power system 2 AC line 6 Independent power line 6a 1st independent power line 6b 2nd independent power line 7 Electrical outlet (electric terminal for independent operation)
9 Power load device for self-support 10 Fuel cell power generator 11 Fuel cell section 12 Power generation control means 20 Waste heat recovery device (power load device)
21 Rechargeable battery 30 Delay circuit

Claims (6)

When the fuel cell unit and a normal state in which power supply from the power system to the AC line is normally performed, a connected operation for outputting the generated power of the fuel cell unit to the AC line is performed, and the AC is transmitted from the power system. Power generation control configured to perform a self-sustained operation of outputting the generated power of the fuel cell unit to a self-contained power line electrically disconnected from the power system when an abnormal state in which power supply to the line is not normally performed A fuel cell power generator having means;
A fuel cell power generation system comprising a self-sustaining operation electrical terminal that receives supply of power from the fuel cell power generation device via the independent power line in the abnormal state,
A power load device that receives power supply through the AC line in the normal state and receives power supply from the fuel cell power generation device through the independent power line in the abnormal state;
The power load device has a rechargeable battery, and both supply of power from the AC line to itself and supply of power from the fuel cell power generation device to the self through the stand-alone power line are stopped. And whether or not the fuel cell power generation device is permitted to perform the interconnection operation while receiving the supply of electric power. The system permission / rejection information is stored and the connection permission / rejection information is transmitted to the fuel cell power generator at a set timing,
The power generation control means of the fuel cell power generation device is permitted to perform the interconnection operation with reference to the interconnection permission information transmitted from the power load device during the interconnection operation. If it cannot be determined that the fuel cell unit is, the fuel cell unit is configured to stop the power generation operation,
When the fuel cell power generator starts to supply power to the independent power line, the supply of power from the fuel cell power generator via the independent power line is directed to the power load device rather than the electric terminal for independent operation. A fuel cell power generation system configured to start with priority in time.   The power generation control means of the fuel cell power generator is configured such that the power consumption by the power load device and the power consumption by the power load device for self-sustained operation connected to the electric terminal for self-sustained operation when performing the self-sustained operation. When the sum with the power is equal to or greater than a set upper limit power, the supply of power from the fuel cell unit to the independent power line is stopped or the power from the fuel cell unit to the independent power line is stopped for a set time. The fuel cell power generation system according to claim 1, configured to perform power supply interruption processing for resuming supply.   A delay circuit that delays the start of power supply in the middle of the independent power line from the fuel cell power generator to the electrical terminal for independent operation; and the fuel cell power generator supplies power to the independent power line When starting the power supply, the power supply from the fuel cell power generation device via the self-sustained power line is given priority over the power load device over the power terminal for self-sustained operation due to the delay action of the delay circuit. The fuel cell power generation system according to claim 1 or 2, which is started as described above. When the fuel cell power generator is performing the self-sustained operation, the self-supporting power line is connected to the power load device from the fuel cell power generator and the fuel cell power generator during the self-sustained operation. A second self-standing power line connected to the electrical terminal for use,
When the power generation control means of the fuel cell power generation device starts supplying power from the fuel cell power generation device to the self-contained power line, the power generation control unit supplies power from the fuel cell power generation device to the first self-contained power line. 3. The fuel cell power generation system according to claim 1, wherein the fuel cell power generation system is configured to start with priority over the supply of power from the fuel cell power generation device to the second independent power line.   The fuel cell power generation system according to any one of claims 1 to 4, wherein the power load device is an exhaust heat recovery device that recovers exhaust heat from the fuel cell power generation device.   The fuel cell power generation system according to any one of claims 1 to 5, wherein the electric terminal for independent operation is configured as an electrical outlet.

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