Fuel cell system and method for controlling fuel cell system

Abstract

To determine the type of abnormal condition detected by a detector.SOLUTION: A fuel cell system according to an embodiment includes: a fuel cell module that operates by being supplied with power from a grid power source, and includes a fuel cell auxiliary device and a detector that detects abnormal conditions including gas leakage and ventilation amount abnormality; and a control device that controls supply of power from the grid power source to the fuel cell module. The control device includes: an interlock circuit that generates an interlock signal based on an abnormality detection signal of the detector; a circuit breaker that cuts off the supply of power from the grid power source to the fuel cell module based on the interlock signal; and a delay circuit that is placed between the interlock circuit and the circuit breaker, and delays the interlock signal and transmits it to the circuit breaker.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] FIELD OF THE PRESENT EMBODIMENTS The present invention relates to a fuel cell system and a method for controlling a fuel cell system. [Background technology]

[0002] There is known a fuel cell system that includes a fuel cell module that operates by receiving power from a power grid and a control device that controls the supply of power from the power grid to the fuel cell module. The fuel cell module has fuel cell auxiliaries and a detector that detects abnormal conditions, including gas leakage and abnormal ventilation volume.

[0003] Conventionally, when a detector detects an abnormal condition, including a gas leak or abnormal ventilation volume, an interlock signal is generated based on the detector's abnormality detection signal, and a circuit breaker is operated based on the interlock signal to cut off the supply of power from the system power source to the fuel cell module.

[0004] However, when the power supply from the system power source to the fuel cell module is cut off, the power supply to the detector is also cut off, so the control device is unable to process the abnormality detection signal from the detector and is unable to determine whether the abnormal condition detected by the detector is a gas leak or an abnormality in the ventilation volume. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-26873 A Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of these points, and aims to provide a fuel cell system and a control method for a fuel cell system that are capable of determining the type of abnormal condition detected by a detector. [Means for solving the problem]

[0007] A fuel cell system according to an embodiment includes a fuel cell module that operates by receiving power from a grid power supply, the fuel cell module including a fuel cell auxiliary device and a detector that detects abnormal conditions including gas leakage and abnormal ventilation volume, and a control device that controls the supply of power from the grid power supply to the fuel cell module. The control device includes an interlock circuit that generates an interlock signal based on an abnormality detection signal from the detector, a circuit breaker that cuts off the supply of power from the grid power supply to the fuel cell module based on the interlock signal, and a delay circuit that is arranged between the interlock circuit and the circuit breaker and delays the interlock signal before transmitting it to the circuit breaker.

[0008] Also, a control method for a fuel cell system according to an embodiment is a control method for a fuel cell system including a fuel cell module that operates by receiving power from a grid power supply, and a control device that controls the supply of power from the grid power supply to the fuel cell module. The fuel cell module includes fuel cell accessories and a detector that detects abnormal conditions including gas leakage and abnormal ventilation volume. The control device includes a circuit breaker that cuts off the supply of power from the grid power supply to the fuel cell module. The control method includes a generating step of generating an interlock signal based on an abnormality detection signal from the detector, a delaying step of delaying and transmitting the interlock signal to the circuit breaker, and a cutting step of the circuit breaker cutting off the supply of power from the grid power supply to the fuel cell module based on the interlock signal. Effect of the Invention

[0009] According to the present invention, it is possible to determine the type of abnormal state detected by the detector. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram of a fuel cell system according to an embodiment of the present invention. [Diagram 2]FIG. 2 is a schematic diagram of a fuel cell system according to a first comparative example. [Diagram 3] FIG. 3 is a schematic diagram of a fuel cell system according to a second comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fuel cell system and a method for controlling a fuel cell system according to an embodiment of the present invention will now be described with reference to the drawings.

[0012] First, a fuel cell system according to the present embodiment will be described with reference to Fig. 1. The fuel cell system according to the present embodiment is a fuel cell system for a mobile body mounted on a mobile body such as an automobile, a railroad car, an aircraft, or a ship. However, the fuel cell system is not limited to this and can be applied to various fields. For example, the fuel cell system may be applied to a stationary application such as a factory, a hospital, a commercial facility, or a house.

[0013] As shown in FIG. 1, the fuel cell system 1 includes a fuel cell module 10 and a control device 20.

[0014] The fuel cell module 10 is configured to generate power using a fuel gas and an oxidant gas. The fuel cell module 10 may include a fuel cell stack (fuel cell) configured by stacking a plurality of fuel cell cells. The plurality of fuel cell cells generate power by a reaction shown in the following chemical formula 1. More specifically, the fuel gas is, for example, a hydrogen-containing gas. The fuel gas flows through a fuel gas flow path in the fuel cell, causing a fuel electrode reaction. The oxidant gas is, for example, air (atmosphere). The oxidant gas flows through an oxidant gas flow path in the fuel cell, causing an oxidant electrode reaction. The fuel cell stack is configured to be able to extract electrical energy from an electrode provided on a current collector plate by utilizing these electrochemical reactions.

[0015] (chemical formula 1) Anode reaction: H2 → 2H + + 2e- Oxidant electrode reaction: 1 / 2O2+ 2H + +2e - → H2O

[0016] The fuel cell module 10 operates by receiving power from a power grid 3. As the power grid 3, power may be supplied from a diesel generator, a storage battery, a power distribution substation, etc. (not shown). The power from the power grid 3 may be AC ​​power. The fuel cell module 10 includes an auxiliary device 12 and a detector 14.

[0017] The auxiliary devices 12 are operated by receiving power from the power grid 3. The auxiliary devices 12 operate the fuel cell module 10 or assist the operation of the fuel cell module 10. In the illustrated example, the fuel cell module 10 includes four auxiliary devices 12a, 12b, 12c, and 12d, and each of the auxiliary devices 12a, 12b, 12c, and 12d is supplied with power from the power grid 3. The auxiliary devices 12 may include, for example, a pump or blower for supplying gas to the fuel cell stack, a fuel cutoff valve, a flowmeter or a pressure gauge for monitoring the fuel cell stack, and the like. In the illustrated example, the auxiliary device 12a may be, for example, a flowmeter. The auxiliary device 12b may be, for example, a pressure gauge or a fuel cutoff valve. The auxiliary device 12c may be, for example, a pump. The auxiliary device 12d may be, for example, a blower. Information (signals) related to the operation and measurement of each of the auxiliary devices 12a, 12b, 12c, and 12d is transmitted to a control circuit 27, which will be described later.

[0018] The detector 14 is operated by receiving power from the system power supply 3. The detector 14 detects abnormal conditions including gas leakage and abnormal ventilation volume. The detector 14 may include, for example, a gas concentration detector that detects the concentration of hydrogen gas and a fan rotation speed meter that measures the rotation speed of a fan of a ventilation device. For example, the detector 14 may detect hydrogen gas leakage from the fuel cell module 10 by detecting the concentration of hydrogen gas in a room (within an installation area) in which the fuel cell module 10 is installed. In addition, for example, the detector 14 may detect abnormal ventilation volume in the room by detecting the rotation speed of a fan of a ventilation device in the room in which the fuel cell module 10 is installed or by detecting the pressure difference between the room in which the fuel cell module 10 is installed and the outside of the room. When the detector 14 detects an abnormal condition, information related to the abnormal condition of the detector 14 is transmitted as an abnormality detection signal to an interlock circuit 25 described later and a control circuit 27 described later.

[0019] The control device 20 is configured to control the fuel cell module 10. In particular, the control device 20 is configured to control the supply of power from the system power supply 3 to the fuel cell module 10. In other words, the control device 20 controls the supply of power from the system power supply 3 to the auxiliary equipment 12 and the detector 14.

[0020] The control device 20 includes a transformer 21, a voltage converter 22, a UPS (uninterruptible power supply) 23, a circuit breaker 24, an interlock circuit 25, a delay circuit 26, a control circuit 27, and a communication circuit .

[0021] The transformer 21 is connected to the system power supply 3. The transformer 21 can convert the voltage of the system power supply 3 into a voltage suitable for use by equipment. The voltage converter 22 is connected to the transformer 21. The voltage converter 22 can convert AC power (AC voltage) from the transformer 21 into DC power (DC voltage). The UPS 23 is also connected to the transformer 21. The UPS 23 can store power from the transformer 21, and can output power (AC power) even when an abnormality occurs in the system power supply 3, such as during a power outage.

[0022] The voltage converter 22 is connected to the auxiliary 12a, the detector 14, and a control circuit 27 described later. Power from the voltage converter 22 is supplied to the auxiliary 12a, the detector 14, and the control circuit 27, respectively. The UPS 23 is connected to the auxiliary 12b and the control circuit 27. Power from the UPS 23 is supplied to the auxiliary 12b and the control circuit 27, respectively. Power from the UPS 23 is supplied even when an abnormality occurs in the system power supply 3, such as during a power outage. The transformer 21 is also connected to the auxiliary 12c. Power from the transformer 21 is also supplied to the auxiliary 12c. The system power supply 3 is also connected to the auxiliary 12d. Power from the system power supply 3 is also supplied to the auxiliary 12d.

[0023] The circuit breaker 24 is configured to cut off the supply of power from the system power supply 3 to the fuel cell module 10. The circuit breaker 24 cuts off the supply of power from the system power supply 3 to the fuel cell module 10 based on an interlock signal generated by an interlock circuit 25 described later. In the illustrated example, the control device 20 includes four circuit breakers 24a, 24b, 24c, and 24d. The circuit breaker 24a is disposed between the voltage converter 22 and the auxiliary 12a and the detector 14. The circuit breaker 24a can cut off the supply of power from the voltage converter 22 to the auxiliary 12a and the detector 14. The circuit breaker 24b is disposed between the UPS 23 and the auxiliary 12b. The circuit breaker 24b can cut off the supply of power from the UPS 23 to the auxiliary 12b. The circuit breaker 24c is disposed between the transformer 21 and the auxiliary 12c. The circuit breaker 24c can cut off the supply of power from the transformer 21 to the auxiliary 12c. The circuit breaker 24d is disposed between the system power supply 3 and the auxiliary device 12d. The circuit breaker 24d can cut off the supply of power from the system power supply 3 to the auxiliary device 12d. The circuit breaker 24 may be any device that can operate based on an interlock signal. For example, the circuit breaker 24 may be configured with an electromagnetic switch, an electromagnetic contactor, or a relay.

[0024] The interlock circuit 25 is connected to the detector 14 and each of the circuit breakers 24a, 24b, 24c, and 24d. The interlock circuit 25 can receive an abnormality detection signal from the detector 14. When the interlock circuit 25 receives an abnormality detection signal from the detector 14, it generates an interlock signal based on the abnormality detection signal. For example, the interlock circuit 25 generates an interlock signal when the concentration of hydrogen gas related to the abnormality detection signal is equal to or higher than a predetermined concentration. Also, for example, the interlock circuit 25 generates an interlock signal when the rotation speed of the fan of the ventilation device related to the abnormality detection signal is equal to or lower than a predetermined rotation speed, or when the indoor / outdoor pressure difference related to the abnormality detection signal is equal to or higher than a predetermined pressure. The interlock signal generated by the interlock circuit 25 is transmitted to each of the circuit breakers 24a, 24b, 24c, and 24d. Each of the circuit breakers 24a, 24b, 24c, and 24d that has received the interlock signal cuts off the supply of power from the system power supply 3 to the corresponding auxiliary devices 12a, 12b, 12c, and 12d and the detector 14 based on the interlock signal.

[0025] The delay circuit 26 is disposed between the interlock circuit 25 and the breaker 24. The delay circuit 26 is configured to delay the interlock signal generated by the interlock circuit 25 and transmit it to the breaker 24. After delaying the interlock signal from the interlock circuit 25, the delay circuit 26 may transmit the interlock signal as is to the breaker 24, or may convert the interlock signal into another form and transmit it to the breaker 24. The delay circuit 26 may delay the interlock signal for a preset delay period Td. The delay period Td may be set within a range of, for example, 0.1 seconds to 10 seconds. By the delay circuit 26 delaying the interlock signal and transmitting it to the breaker 24, even if an abnormal state is detected by the detector 14, the auxiliary device 12 and the detector 14 can operate during the delay period Td set by the delay circuit 26. For this reason, the control circuit 27 described later can receive and store the signals of the auxiliary devices 12a, 12b, 12c, and 12d and the abnormality detection signal of the detector 14 during the delay period Td.

[0026] The control circuit 27 is connected to each of the auxiliaries 12a, 12b, 12c, and 12d and the detector 14. The control circuit 27 is configured to be able to control each of the auxiliaries 12a, 12b, 12c, and 12d and the detector 14. The control circuit 27 can receive and store signals from each of the auxiliaries 12a, 12b, 12c, and 12d and an abnormality detection signal from the detector 14. The control circuit 27 can analyze the abnormality detection signal based on the stored abnormality detection signal and determine the type of abnormality state related to the abnormality detection signal. That is, the control circuit 27 can determine whether the abnormality state related to the abnormality detection signal is a gas leak or an abnormality in the ventilation volume.

[0027] As described above, the control circuit 27 is connected to the voltage converter 22 and the UPS 23. Therefore, the control circuit 27 is supplied with power from the voltage converter 22 and power from the UPS 23. In particular, the control circuit 27 is connected to the voltage converter 22 between the voltage converter 22 and the circuit breaker 24a, and is connected to the UPS 23 between the UPS 23 and the circuit breaker 24b. As a result, even if the supply of power from the system power supply 3 to the fuel cell module 10 is cut off by the circuit breakers 24a and 24b, power from the voltage converter 22 and power from the UPS 23 are supplied to the control circuit 27. Therefore, the control circuit 27 can operate even if the supply of power from the system power supply 3 to the fuel cell module 10 is cut off by the circuit breakers 24a and 24b.

[0028] The control circuit 27 can receive and store the abnormality detection signal of the detector 14 during the delay period Td by the delay circuit 26. The control circuit 27 can then determine the type of abnormal condition based on the stored abnormality detection signal. The control circuit 27 may determine the type of abnormal condition during the delay period Td, or may determine the type of abnormal condition after the delay period Td has elapsed. The result of the determination of the type of abnormal condition by the control circuit 27 is stored in the control circuit 27 and is also transmitted to a communication circuit 28, which will be described later.

[0029] The communication circuit 28 is connected to the control circuit 27. The communication circuit 28 is also connected to the external device 5 by wire or wirelessly. The communication circuit 28 is configured to transmit the determination result by the control circuit 27 to the external device 5 (external). The external device 5 may be, for example, a monitoring system that monitors an abnormal state of the fuel cell module 10 from externally.

[0030] In the present embodiment, an example has been described in which the control circuit 27 receives and stores an abnormality detection signal during the delay period Td set by the delay circuit 26, and determines the type of abnormal state based on the stored abnormality detection signal. However, this is not limited to this, and for example, the abnormality detection signal may be transmitted to the external device 5 via the communication circuit 28 during the delay period Td, and the type of abnormal state may be determined by the external device 5.

[0031] Next, the effects of the present embodiment configured as described above will be described, along with a method for controlling the fuel cell system 1 according to the present embodiment.

[0032] When the fuel cell system 1 is started, power is supplied from the system power supply 3 to the fuel cell module 10. More specifically, first, the power from the system power supply 3 is supplied to the transformer 21, where it is converted into a voltage suitable for use in the devices. Next, the power from the transformer 21 is supplied to the voltage converter 22, where it is converted from AC power to DC power. Then, the power from the voltage converter 22 is supplied to the auxiliary device 12a, the detector 14, and the control circuit 27. In addition, the power from the transformer 21 is also supplied to the UPS 23, where the power is stored, and the power from the UPS 23 is supplied to the auxiliary device 12b and the control circuit 27, respectively. In addition, the power from the transformer 21 is also supplied to the auxiliary device 12c. In addition, the power from the system power supply 3 is also supplied to the auxiliary device 12d.

[0033] The control circuit 27, which has been supplied with power from the system power supply 3, starts up the auxiliaries 12a, 12b, 12c, and 12d, the detector 14, a power conditioner (not shown), and starts power generation by the fuel cell module 10. While the fuel cell module 10 is generating power, the control circuit 27 controls the auxiliaries 12a, 12b, 12c, and 12d and the detector 14. The control circuit 27 also receives and stores signals from the auxiliaries 12a, 12b, 12c, and 12d and a signal from the detector 14.

[0034] When the detector 14 detects an abnormal state including a gas leak and an abnormality in the ventilation volume, the detector 14 transmits an abnormality detection signal to the interlock circuit 25. When the interlock circuit 25 receives the abnormality detection signal of the detector 14, the interlock circuit 25 generates an interlock signal based on the abnormality detection signal (generation step). The generated interlock signal is transmitted to the delay circuit 26. When the delay circuit 26 receives the interlock signal, the delay circuit 26 delays the interlock signal for a predetermined delay period Td (delay step). The delayed interlock signal is transmitted to each of the circuit breakers 24a, 24b, 24c, and 24d. When the circuit breakers 24a, 24b, 24c, and 24d receive the interlock signal, the circuit breakers 24a, 24b, 24c, and 24d cut off the supply of power from the system power source 3 to each of the auxiliary devices 12a, 12b, 12c, and 12d and the detector 14 based on the interlock signal (cutoff step).

[0035] On the other hand, the abnormality detection signal of the detector 14 is also transmitted to the control circuit 27. The control circuit 27 receives and stores this abnormality detection signal during the delay period Td by the delay circuit 26. Then, the control circuit 27 determines the type of abnormal state based on the stored abnormality detection signal. That is, the control circuit 27 determines whether the abnormal state related to the abnormality detection signal is a gas leak or an abnormality in the ventilation volume. The determination result by the control circuit 27 is transmitted to the communication circuit 28. Then, the communication circuit 28 transmits the determination result by the control circuit 27 to the external device 5 (external).

[0036] Here, a fuel cell system 100 according to a first comparative example will be described with reference to Fig. 2. In Fig. 2, the same parts as those in the present embodiment shown in Fig. 1 are given the same reference numerals, and description thereof will be omitted. In the fuel cell system 100 according to the first comparative example shown in Fig. 2, the control device 120 has one circuit breaker 124 instead of the four circuit breakers 24a, 24b, 24c, and 24d. The circuit breaker 124 is disposed between the system power supply 3 and the transformer 21 and the auxiliary device 12d. In addition, the control device 120 does not have a delay circuit 26, and the circuit breaker 124 is directly connected to the interlock circuit 25.

[0037] In this first comparative example, when the detector 14 detects an abnormal state including a gas leak and an abnormality in the ventilation volume, the interlock signal generated by the interlock circuit 25 is transmitted to the circuit breaker 124 without passing through the delay circuit 26. As a result, the circuit breaker 124 that receives the interlock signal immediately cuts off the supply of power from the system power supply 3 to each of the auxiliaries 12a, 12b, 12c, and 12d, the detector 14, and the control circuit 27 based on the interlock signal. Therefore, each of the auxiliaries 12a, 12b, 12c, and 12d, the detector 14, and the control circuit 27 immediately stop operating. As a result, the control circuit 27 cannot receive and store the abnormality detection signal of the detector 14, and cannot determine whether the abnormal state detected by the detector 14 is a gas leak or an abnormality in the ventilation volume.

[0038] A fuel cell system 200 according to a second comparative example will be described with reference to Fig. 3. In Fig. 3, the same parts as those in the present embodiment shown in Fig. 1 are given the same reference numerals and their description will be omitted. In the fuel cell system 200 according to the second comparative example shown in Fig. 3, the control device 220 does not have a delay circuit 26, and each of the breakers 24a, 24b, 24c, and 24d is directly connected to the interlock circuit 25.

[0039] In the second comparative example, when the detector 14 detects an abnormal state including a gas leak and an abnormality in the ventilation volume, the interlock signal generated by the interlock circuit 25 is transmitted to each of the circuit breakers 24a, 24b, 24c, and 24d without passing through the delay circuit 26. As a result, each of the circuit breakers 24a, 24b, 24c, and 24d that receives the interlock signal immediately cuts off the supply of power from the system power supply 3 to the corresponding auxiliary devices 12a, 12b, 12c, and 12d and the detector 14 based on the interlock signal. Therefore, each of the auxiliary devices 12a, 12b, 12c, and 12d and the detector 14 immediately stops operating. As a result, the control circuit 27 cannot receive and store the abnormality detection signal of the detector 14, and cannot determine whether the abnormal state detected by the detector 14 is a gas leak or an abnormality in the ventilation volume.

[0040] In contrast, according to the present embodiment, the control device 20 includes a delay circuit 26 that is disposed between the interlock circuit 25 and the breaker 24 and delays the interlock signal before transmitting it to the breaker 24. This allows the detector 14 to operate during the delay period Td set by the delay circuit 26, even if an abnormal condition is detected by the detector 14. This makes it possible to process the abnormality detection signal of the detector 14 during the delay period Td. As a result, the type of abnormal condition detected by the detector 14 can be determined.

[0041] In particular, according to this embodiment, the control device 20 includes a control circuit 27 that receives and stores the abnormality detection signal during the delay period Td set by the delay circuit 26. In this manner, the abnormality detection signal of the detector 14 can be received and stored by the control circuit 27 during the delay period Td set by the delay circuit 26. Therefore, the type of abnormal state detected by the detector 14 can be determined based on the abnormality detection signal stored in this control circuit 27.

[0042] Furthermore, according to this embodiment, the control circuit 27 determines the type of abnormal condition based on the stored abnormality detection signal. In this manner, the control circuit 27 can quickly analyze the abnormality detection signal and determine the type of abnormal condition detected by the detector 14.

[0043] Furthermore, according to this embodiment, the control device 20 includes a communication circuit 28 that transmits to the outside the determination result made by the control circuit 27. This makes it possible to transmit the determination result made by the control circuit 27 to an external device 5 such as a monitoring system via the communication circuit 28. This makes it possible to monitor abnormal states of the fuel cell module 10 from the outside.

[0044] Furthermore, according to this embodiment, the delay circuit 26 delays the interlock signal for a preset delay period Td. In this manner, the delay period Td by the delay circuit 26 can be appropriately set by an administrator. This allows the fuel cell system 1 to be operated flexibly.

[0045] Furthermore, according to this embodiment, the circuit breaker 24 is configured with an electromagnetic switch, an electromagnetic contactor, or a relay. This allows the circuit breaker 24 to be easily controlled based on the interlock signal. This makes it possible to easily control the fuel cell system 1. Furthermore, these circuit breakers 24 can automatically resume the supply of power when the cause of the abnormal state is removed and the interlock signal is no longer sent to the circuit breaker 24.

[0046] Moreover, according to this embodiment, the fuel cell system 1 is a fuel cell system 1 for a mobile body mounted on a mobile body. In particular, in a fuel cell system 1 mounted on a mobile body such as a ship, when an electrical device in an installation area of ​​the fuel cell module 10 is connected to other electrical devices for use, in the event of an abnormal state including gas leakage and ventilation volume, it is required to cut off the supply of power to the fuel cell module 10 and to determine whether the abnormal state is a gas leakage or an abnormality in the ventilation volume. For this reason, this embodiment is particularly useful as a fuel cell system 1 for a mobile body mounted on a mobile body such as a ship.

[0047] According to the embodiment described above, it is possible to determine the type of abnormal state detected by the detector.

[0048] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0049] 1: fuel cell system, 3: system power supply, 10: fuel cell module, 12: auxiliary equipment, 14: detector, 20: control device, 24: circuit breaker, 25: interlock circuit, 26: delay circuit, 27: control circuit, 28: communication circuit

Claims

1. A fuel cell module that is operated by receiving power from a system power supply, the fuel cell module including a fuel cell auxiliary device and a detector that detects abnormal conditions including gas leakage and abnormal ventilation volume; a control device that controls the supply of power from the system power supply to the fuel cell module, The control device includes an interlock circuit that generates an interlock signal based on an abnormality detection signal of the detector, a circuit breaker that cuts off the supply of power from the system power source to the fuel cell module based on the interlock signal, and a delay circuit that is arranged between the interlock circuit and the circuit breaker and delays the interlock signal before transmitting it to the circuit breaker.

2. The control device receives and stores the abnormality detection signal during the delay period set by the delay circuit.

2. The fuel cell system of claim 1, further comprising a control circuit for:

3. 3. The fuel cell system according to claim 2, wherein the control circuit determines the type of the abnormal state based on the stored abnormality detection signal.

4. 4. The fuel cell system according to claim 3, wherein the control device includes a communication circuit that transmits a result of the determination made by the control circuit to an external device.

5. 5. The fuel cell system according to claim 1, wherein the delay circuit delays the interlock signal for a preset delay period.

6. 6. The fuel cell system according to claim 1, wherein the circuit breaker is an electromagnetic switch, an electromagnetic contactor, or a relay.

7. 7. The fuel cell system according to claim 1, wherein the fuel cell system is a fuel cell system for a mobile body that is mounted on a mobile body.

8. A method for controlling a fuel cell system including a fuel cell module that operates by receiving power from a power grid, and a control device that controls the supply of power from the power grid to the fuel cell module, comprising: the fuel cell module includes a fuel cell auxiliary device and a detector for detecting an abnormal state including a gas leak and an abnormality in ventilation volume; the control device includes a circuit breaker that cuts off the supply of power from the system power supply to the fuel cell module, The control method includes a generating step of generating an interlock signal based on an abnormality detection signal of the detector, a delaying step of delaying the interlock signal and transmitting it to the circuit breaker, and a cutting step of the circuit breaker cutting off the supply of power from the system power source to the fuel cell module based on the interlock signal.

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