Power-supply system

Abstract

To provide a power-supply system capable of sharing some of functions with an existing power-supply system when additionally installing power generators in cooperation with each other.SOLUTION: A power-supply system 1 comprises one or more power-generation modules 70, a power conditioner 10 for converting a DC power generated by the one or more power-generation modules 70 into an AC power, and a fuel cell system 30. The power conditioner 10 comprises a DC / DC converter 12, a storage battery 14, and a DC / AC converter 15. The DC / DC converter 12 converts the DC power generated by a solar cell module 20 or the fuel cell system 30 into a prescribed DC power. The fuel cell system 30 comprises a fuel cell stack 41, an auxiliary machine 43 operated by supplying power from the power conditioner 10 during starting-up, a low-voltage AC / DC converter 50, and a control device 60.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power supply system. [Background technology]

[0002] BACKGROUND ART Conventionally, there is known a technique relating to a power supply system that combines a solar power generation system and a power generation device (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-95068 Summary of the Invention [Problem to be solved by the invention]

[0004] From the viewpoint of a BCP (Business Continuity Plan), a power supply system may need to add a power generating device to be connected to it. However, in the method disclosed in Patent Document 1, the added power generating device cannot share some functions with the existing power supply system, which may increase costs and installation area. [Means for solving the problem]

[0005] The power supply system that achieves the above object is a power supply system comprising one or more solar cell modules, a power conditioner that converts DC power generated by the solar cell modules into AC power, and a fuel cell system, wherein the power conditioner comprises a plurality of connection ports to which the solar cell modules or the fuel cell system are connected, a number of DC / DC converters corresponding to the number of connection ports, a storage battery that stores power output by the DC / DC converter or discharges the stored power, and a DC / AC converter that converts the DC power output by the DC / DC converter or the DC power discharged by the storage battery into AC power, and the DC / DC converter is electrically connected to the connection port, and when the solar cell module is connected to the corresponding connection port, a power conditioner that converts DC power generated by a fuel cell module into a predetermined DC power, and when the fuel cell system is connected to the corresponding connection port, converts the DC power generated by the fuel cell system into the predetermined DC power; the fuel cell system includes a fuel cell stack that generates electricity by a reaction between an anode gas supplied to an anode flow path and a cathode gas supplied to a cathode flow path; accessories necessary for power generation by the fuel cell stack, the accessories operating on power supplied from the power conditioner at startup; a low-voltage AC / DC converter that converts the AC power output by the DC / AC converter into DC power of a lower voltage than the predetermined DC power; and a control device that operates on the low-voltage DC power and controls the operation of the fuel cell system based on the SOC of the storage battery.

[0006] According to this configuration, when an associated power generation device is added, the power supply system can share some of the functions with the existing power supply system. In a power supply system that achieves the above-mentioned object, the fuel cell system may include an AC / DC converter that converts the AC power output by the DC / AC converter into a DC voltage used to operate the auxiliary equipment.

[0007] According to this configuration, the power output from the existing power supply system can be used to drive the auxiliary machinery of the fuel cell system. In a power supply system that achieves the above-mentioned object, the system may further include a power generation module that generates DC power using a generator connected to an internal combustion engine, wherein the plurality of connection ports are connected to the solar cell module, the fuel cell system, or the power generation module, and when the power generation module is connected to a corresponding connection port, the DC / DC converter converts the DC power generated by the power generation module into the specified DC power, and the control device may control the operation of the power generation module based on the SOC of the storage battery.

[0008] With this configuration, the power supply system can share some functions with the existing power supply system while linking the power generation modules. In a power supply system that achieves the above object, the system may further include a switching unit that switches a supply destination of the AC power output by the DC / AC converter between a first load and a second load, wherein the first load is a load to which the AC power is supplied under normal circumstances, and the second load is a load to which the AC power is supplied in an emergency.

[0009] With this configuration, the power supply system can switch the load to which power is supplied between normal operation and emergency operation. [Effects of the Invention]

[0010] According to the present invention, when an associated power generation device is added, some functions can be shared with the existing power supply system. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram (part 1) showing an example of the configuration of a power supply system. [Figure 2] FIG. 2 is a diagram (part 2) showing an example of the configuration of the power supply system. [Figure 3]FIG. 3 is a diagram (part 3) showing an example of the configuration of the power supply system. [Figure 4] FIG. 4 is a diagram (part 4) showing an example of the configuration of a power supply system. DETAILED DESCRIPTION OF THE INVENTION

[0012] <Embodiment> Hereinafter, an embodiment of a power supply system will be described with reference to the drawings. [Overall configuration] As shown in Fig. 1, the power supply system 1 includes a power conditioner 10, a solar cell module 20, and a fuel cell system 30. The power supply system 1 is electrically connected to a load F. The load F receives a supply of power from the power supply system 1. The power conditioner 10 is electrically connected to the solar cell module 20. The power conditioner 10 is also electrically connected to the fuel cell system 30.

[0013] [Power Conditioner 10] The power conditioner 10 converts power generated by a power generation device connected to the power conditioner 10 into power usable by a load F. The solar cell module 20 and the fuel cell system 30 are examples of power generation devices connected to the power conditioner 10. The power conditioner 10 includes, for example, one or more connection ports 11, a number of DC / DC converters 12 corresponding to the number of connection ports 11, a DC / DC converter 13, a storage battery 14, a DC / AC converter 15, and a control unit 16.

[0014] In the example shown in Fig. 1, a power conditioner 10 is provided with a plurality of connection ports 11, namely, connection port 11a, connection port 11b, connection port 11c, etc. In the following description, when there is no need to distinguish between connection port 11a, connection port 11b, and connection port 11c, they will simply be referred to as connection port 11. A solar cell module 20 is connected to connection port 11a, and DC power generated by the solar cell module 20 is supplied to connection port 11b. A fuel cell system 30 is connected to connection port 11b, and DC power generated by the fuel cell system 30 is supplied to connection port 11b.

[0015] As described above, power conditioner 10 includes DC / DC converters 12 in a number corresponding to the number of connection ports 11. Therefore, in the example shown in Fig. 1, power conditioner 10 includes a plurality of DC / DC converters 12, namely DC / DC converter 12a, DC / DC converter 12b, DC / DC converter 12c, ... In the following description, when there is no need to distinguish between DC / DC converter 12a, DC / DC converter 12b, and DC / DC converter 12c, they will be simply referred to as DC / DC converter 12.

[0016] The connection port 11 and the DC / DC converter 12 are electrically connected. The DC / DC converter 12 converts DC power supplied to the electrically connected connection port 11 into predetermined DC power. Specifically, the connection port 11a and the DC / DC converter 12a are electrically connected. The DC / DC converter 12a converts DC power supplied from the solar cell module 20 via the connection port 11a into the predetermined DC power. The connection port 11b and the DC / DC converter 12b are electrically connected. The DC / DC converter 12b converts DC power supplied from the fuel cell system 30 via the connection port 11b into the predetermined DC power.

[0017] DC / DC converter 13 and storage battery 14 are electrically connected. DC / DC converter 13 converts predetermined DC power output by DC / DC converter 12 into DC power that can be stored in storage battery 14. DC / DC converter 13 also converts DC power discharged by storage battery 14 into predetermined DC power that DC / DC converter 12 outputs.

[0018] DC / AC converter 15 converts into AC power the predetermined DC power output by DC / DC converter 12 or the predetermined DC power output by DC / DC converter 13. The predetermined DC power output by DC / DC converter 13 is obtained by converting the DC power discharged by storage battery 14.

[0019] The control unit 16 controls each unit included in the power conditioner 10. Specifically, the control unit 16 controls the DC / DC converter 12 to convert the power generated by the power generation device into predetermined DC power. The control unit 16 also controls the DC / DC converter 13 to convert the predetermined DC power output by the DC / DC converter 12 into DC power that can be stored in the storage battery 14. The control unit 16 also controls the DC / DC converter 13 to convert the DC power discharged by the storage battery 14 into the predetermined DC power. The control unit 16 also controls the DC / AC converter 15 to convert the predetermined DC power output by the DC / DC converter 12 or the DC / DC converter 13 into AC power. As a result, AC power is supplied to the load F as power that the load F can use.

[0020] [Solar cell module 20] The solar cell module 20 has a plurality of solar cells that convert light energy such as sunlight into DC power. The solar cell module 20 outputs the converted DC power to the power conditioner 10. The solar cell module 20 is configured as, for example, a silicon-based solar cell such as monocrystalline silicon or polycrystalline silicon, or a compound-based solar cell such as CIS or CIGS.

[0021] [Fuel Cell System 30] The fuel cell system 30 includes, for example, a fuel cell module 40, a low-voltage AC / DC converter 50, and a control device 60. The fuel cell module 40 includes, for example, a fuel cell stack 41, a boost converter 42, an auxiliary device 43, and an SMR (System Main Relay) 44.

[0022] The fuel cell stack 41 is realized by stacking a plurality of fuel cell units. The fuel cell units are, for example, solid molecular fuel cells. The fuel cell stack 41 generates electricity through a chemical reaction between a fuel gas and an oxidant gas. In this example, the fuel cell stack 41 generates electricity using hydrogen gas filled in a hydrogen tank (not shown) as the fuel gas and oxygen in the air supplied from an air compressor included in the auxiliary equipment 43 as the oxidant gas.

[0023] The boost converter 42 boosts the DC power generated by the fuel cell stack 41. The boost converter 42 generates the boosted DC power between the positive line L1 and the negative line L2.

[0024] The auxiliary device 43 includes an FC radiator, an EV radiator, and an air compressor. The EV radiator is, for example, a cooling device such as the boost converter 42 or other electrical components of the fuel cell system 30. The auxiliary device 43 is electrically connected to the storage battery 14. The boost converter 42 is also electrically connected to the positive line L1 and the negative line L2. The auxiliary device 43 is driven using the power stored in the storage battery 14 when the fuel cell system 30 is started up. When the auxiliary device 43 is driven, oxidant gas is supplied and power is generated in the fuel cell system 30. As power is generated stably in the fuel cell system 30, DC power is supplied to the auxiliary device 43 from the boost converter 42 via the positive line L1 and the negative line L2. In this case, the auxiliary device 43 is driven by the DC power supplied from the boost converter 42 without using the power stored in the storage battery 14.

[0025] As shown in FIG. 1 , an SMR 44 is provided on the positive line L1. The SMR 44 is controlled to an open state or a closed state under the control of the control device 60. In the open state, the SMR 44 puts the fuel cell system 30 and the power conditioner 10 in a disconnected state where they are not electrically connected, and in the closed state, puts the fuel cell system 30 and the power conditioner 10 in a connected state where they are electrically connected. For example, an inrush prevention circuit (not shown) is connected in parallel to the SMR 44. The control device 60 controls the SMR 44 to a closed state when the fuel cell system 30 is to be linked in the power supply system 1, and controls the SMR 44 to an open state when the fuel cell system 30 is not to be linked in the power supply system 1.

[0026] The low-voltage AC / DC converter 50 converts the AC power output by the DC / AC converter 15 into DC power and supplies it to the control device 60. The control device 60 operates using the DC power supplied from the low-voltage AC / DC converter 50. The DC power output by the low-voltage AC / DC converter 50 is DC power with a lower voltage than, for example, the predetermined DC power output by the DC / DC converter 12 or the DC / DC converter 13. For example, the DC power output by the low-voltage AC / DC converter 50 is approximately several tens to several hundred tens of volts, whereas the predetermined DC power output by the DC / DC converter 12 or the DC / DC converter 13 is approximately several hundred volts. Note that the voltage values ​​of the low-voltage DC power and the predetermined DC power are merely examples and are not limited thereto.

[0027] The control device 60 controls each component of the fuel cell module 40. For example, the control device 60 controls the SMR 44 to open or close the connection between the fuel cell system 30 and the power conditioner 10. The control device 60 also controls, for example, the auxiliary equipment 43 to adjust the amount of oxidant gas supplied to the fuel cell stack 41. The control device 60 also controls a valve provided between the fuel cell stack 41 and a hydrogen tank (not shown) to adjust the amount of hydrogen gas supplied to the fuel cell stack 41. In this way, the control device 60 controls the amount of power generated by the fuel cell module 40. The control device 60 controls the amount of power generated by the fuel cell module 40 based on, for example, the SOC (State of Charge) of the storage battery 14. Specifically, when the SOC of the storage battery 14 falls below a first threshold value indicating a lower limit of the SOC, the control device 60 controls the fuel cell module 40 to supply power to the power conditioner 10. In addition, when the SOC of the storage battery 14 becomes greater than a second threshold value indicating the upper limit value of the SOC, the control device 60 controls the fuel cell module 40 so as not to supply power to the power conditioner 10, or controls the SMR 44 to an open state.

[0028] [Effects of the embodiment] According to the above embodiment, the following effects can be obtained. (1) The power supply system 1 includes a power conditioner 10, a solar cell module 20, and a fuel cell system 30. A low-voltage AC / DC converter 50 converts AC power output by a DC / AC converter 15 included in the power conditioner 10 into low-voltage DC power used for the operation of a control device 60.

[0029] From the perspective of BCP (Business Continuity Plan), when a fuel cell system linked to the power supply system 1 is added, the fuel cell system is generally provided separately from the power conditioner 10 and the solar cell module 20. In this case, the fuel cell system is required to have a storage battery different from the storage battery 14 provided in the power conditioner 10. Therefore, the added fuel cell system cannot share some functions with the existing power supply system, which can increase costs and installation area. Specifically, by providing a storage battery different from the storage battery 14, the fuel cell system is more expensive and more difficult to miniaturize than the fuel cell system 30 provided in the power supply system 1.

[0030] With this configuration, when an associated fuel cell system 30 is added, the power supply system 1 can share some functions with the existing power supply system 1. This can prevent the cost and installation area of ​​the power supply system 1 from increasing.

[0031] The above-described embodiments may be modified as follows: The above-described embodiments and the following modifications may be combined with each other within the scope of technical compatibility. [Variation 1] In the above-described embodiment, the auxiliary device 43 operates on DC power supplied from the storage battery 14 at startup, but this is not limiting. The auxiliary device 43 may operate on power supplied from a power supply source other than the storage battery 14 at startup. Below, a case where the fuel cell system 30a includes an AC / DC converter 55 will be described. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0032] 2, the power supply system 2 of the first modification includes a fuel cell system 30a instead of the fuel cell system 30. In addition to the components included in the fuel cell system 30, the fuel cell system 30a also includes an AC / DC converter 55. The AC / DC converter 55 converts the AC power output by the DC / AC converter 15 into a DC voltage used to operate the auxiliary equipment 43. The control device 60 controls the operation of the AC / DC converter 55.

[0033] The auxiliary device 43 of the first modification is driven by DC power supplied from the AC / DC converter 55 when the fuel cell system 30a is started up. When the auxiliary device 43 is driven, an oxidant gas is supplied and power is generated in the fuel cell system 30a. As power generation in the fuel cell system 30a is stabilized, DC power is supplied to the auxiliary device 43 from the boost converter 42 via the positive line L1 and the negative line L2. In this case, the auxiliary device 43 is driven by the DC power supplied from the boost converter 42, without using the DC power supplied from the AC / DC converter 55. Therefore, as power generation in the fuel cell system 30a is stabilized, the control device 60 stops the operation of the AC / DC converter 55.

[0034] [Effects of Modification 1] Here, there may be a case where the range of DC power output by the storage battery 14 does not match the range of DC power used to operate the auxiliary device 43. In this case, it is difficult to use the power stored in the storage battery 14 to operate the auxiliary device 43. With this configuration, the power supply system 2 can use the power output by the DC / AC converter 15 as power to drive the auxiliary device 43 of the fuel cell system 30a.

[0035] [Variation 2] In the above-described embodiment, the power supply system 1 is described as including a solar cell module 20 and a fuel cell system 30 as the power generation device, but this is not limiting, and the power generation device may include a power generation module 70. Below, a case where the power supply system 3 is provided with a power generation module 70 will be described. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals and description thereof will be omitted.

[0036] As shown in FIG. 3 , the power supply system 3 of the second modification includes a power generation module 70 in addition to the components of the power supply system 1. The power generation module 70 includes an internal combustion engine, such as a diesel engine or a gasoline engine, and a generator connected to the internal combustion engine, and generates DC power. The power generation module 70 is electrically connected to the connection port 11c, and DC power generated by the power generation module 70 is supplied to the connection port 11c. The power generation module 70 operates under the control of the control device 60. Specifically, the control device 60 controls the amount of power generated by the power generation module 70 based on the SOC of the storage battery 14. Note that the control of the amount of power generated by the control device 60 based on the SOC of the storage battery 14 is similar to the control of the fuel cell system 30 described above, and therefore will not be described here.

[0037] As described above, the connection port 11c and the DC / DC converter 12c are electrically connected. The DC / DC converter 12c converts the DC power supplied from the power generation module 70 via the connection port 11c into a predetermined DC power.

[0038] [Effects of Modification 2] From the perspective of BCP, when adding a power generation module linked to the power supply system 3, the power generation module may generally be provided separately from the power conditioner 10 and the solar cell module 20. In this case, the power generation module is required to be provided with a storage battery different from the storage battery 14 provided in the power conditioner 10. Therefore, the added power generation module cannot share some functions with the existing power supply system, which may increase costs and installation area. Specifically, by providing a storage battery different from the storage battery 14, the power generation module is more expensive and more difficult to miniaturize than the power generation module 70 provided in the power supply system 3.

[0039] According to this configuration, when an associated power generation module 70 is added, the power supply system 3 can share some functions with the existing power supply system 3. Therefore, it is possible to suppress an increase in the cost and installation area of ​​the power supply system 3.

[0040] [Variation 3] In the above-described embodiment, there are cases where the power supply system 1 supplies power to the load F. Here, from the viewpoint of BCP, there are cases where some of the loads F require continuous operation in an emergency, and others do not. In Modification 3, a case where the power supplied by the power supply system 4 is switched in an emergency will be described. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0041] As shown in FIG. 4 , in Modification 3, the load F includes a first load F1 and a second load F2. The first load F1 is a load F that receives power from the power supply system 4 during normal operation. The second load F2 is a load that receives power from the power supply system 4 during an emergency. The power supply system 4 includes a switching unit 80 in addition to the components included in the power supply system 1. The switching unit 80 switches the supply destination of AC power output by the DC / AC converter 15 between the first load F1 and the second load F2. Specifically, the switching unit 80 is controlled by the control unit 16 to a first state or a second state. In the first state, the switching unit 80 establishes a connected state in which the DC / AC converter 15 and the first load F1 are electrically connected. In the second state, the switching unit 80 establishes a disconnected state in which the DC / AC converter 15 and the second load F2 are not electrically connected. In the second state, the switching unit 80 sets the DC / AC converter 15 and the second load F2 to a connected state in which they are electrically connected to each other. In the second state, the switching unit 80 sets the DC / AC converter 15 and the first load F1 to a disconnected state in which they are not electrically connected to each other. The control unit 16 controls the switching unit 80 while determining whether it is normal or an emergency based on the state of power supply to the load F.

[0042] [Effects of Modification 4] From the viewpoint of BCP, the power supply system 4 can extend the operation duration of the second load F2 in an emergency by cutting off the supply of power to the first load F1 and supplying power only to the second load F2. With this configuration, the power supply system 4 can extend the operation duration of the more important second load F2 by switching the load F to which power is supplied between normal times and emergencies.

[0043] If the specified DC power output by DC / DC converter 12 is DC power that can be stored in storage battery 14, and the DC power discharged from storage battery 14 is the specified DC power, power conditioner 10 does not need to be equipped with DC / DC converter 13.

[0044] The SMR 44 may be provided on the negative line L2. When controlling the power generation amount of the fuel cell module 40 and the power generation module 70, the control device 60 may control the power generation amount according to the SOC value in addition to the control based on the SOC threshold. For example, the control device 60 may control the power generation amount of the fuel cell module 40 and the power generation module 70 so that the smaller the SOC value, the greater the power generation amount of the fuel cell module 40 and the power generation module 70, and the greater the SOC value, the less the power generation amount of the fuel cell module 40 and the power generation module 70.

[0045] The first load F1 may include a second load F2. In this case, the second load F2 receives power from the power supply system 4 in normal times and in emergencies. The auxiliary device 43 may be realized by a cooling water pump, a fan, an air pressure adjusting valve, an air shutoff valve, a hydrogen circulation pump, or the like.

[0046] The technical ideas that can be understood from the above-described embodiment and modified examples will be described. [Aspect 1] A power supply system includes one or more solar cell modules, a power conditioner that converts DC power generated by the solar cell modules into AC power, and a fuel cell system, wherein the power conditioner includes a plurality of connection ports to which the solar cell modules or the fuel cell system are connected, a number of DC / DC converters corresponding to the number of connection ports, a storage battery that stores power output by the DC / DC converter or discharges the stored power, and a DC / AC converter that converts the DC power output by the DC / DC converter or the DC power discharged by the storage battery into AC power, and the DC / DC converters are electrically connected to the connection ports, and the solar cell modules are connected to the corresponding connection ports. In this case, the power conditioner converts the DC power generated by the solar cell module into a predetermined DC power, and when the fuel cell system is connected to the corresponding connection port, converts the DC power generated by the fuel cell system into the predetermined DC power. The fuel cell system includes a fuel cell stack that generates electricity by a reaction between an anode gas supplied to an anode flow path and a cathode gas supplied to a cathode flow path, accessories necessary for power generation by the fuel cell stack that operate with power supplied from the power conditioner at start-up, a low-voltage AC / DC converter that converts the AC power output by the DC / AC converter into DC power of a lower voltage than the predetermined DC power, and a control device that controls the operation of the fuel cell system based on the SOC of the storage battery.

[0047] [Aspect 2] The fuel cell system is a power supply system described in [Aspect 1], which is equipped with an AC / DC converter that converts the AC power output by the DC / AC converter into a DC voltage used to operate the auxiliary equipment.

[0048] [Aspect 3] A power supply system as described in [Aspect 1] or [Aspect 2], further comprising a power generation module that generates DC power using a generator connected to an internal combustion engine, wherein the multiple connection ports are connected to the solar cell module, the fuel cell system, or the power generation module, and when the power generation module is connected to the corresponding connection port, the DC / DC converter converts the DC power generated by the power generation module into the specified DC power, and the control device controls the operation of the power generation module based on the SOC of the storage battery.

[0049] [Aspect 4] The power supply system of any one of [Aspect 1] to [Aspect 3], further comprising a switching unit that switches the destination of the AC power output by the DC / AC converter to a first load or a second load, the first load being a load to which the AC power is supplied under normal circumstances, and the second load being a load to which the AC power is supplied in an emergency. [Explanation of symbols]

[0050] 1, 2, 3, 4...power supply system, 10...power conditioner, 11, 11a, 11b, 11c...connection port, 12, 12a, 12b, 12c, 13...DC / DC converter, 14...storage battery, 15...DC / AC converter, 16...control unit, 20...solar cell module, 30, 30a...fuel cell system, 40...fuel cell module, 41...fuel cell stack, 42...boost converter, 43...auxiliary equipment, 50...low-voltage AC / DC converter, 55...AC / DC converter, 60...control device, 70...power generation module, 80...switching unit, F...load, F1...first load, F2...second load, L1...positive line, L2...negative line.

Claims

1. A power supply system comprising one or more solar cell modules, a power conditioner that converts DC power generated by the solar cell modules into AC power, and a fuel cell system, The power conditioner comprises: a plurality of connection ports to which the solar cell module or the fuel cell system is connected; DC / DC converters, the number of which corresponds to the number of the connection ports; a storage battery that stores the power output by the DC / DC converter or discharges the stored power; a DC / AC converter that converts DC power output by the DC / DC converter or DC power discharged from the storage battery into AC power, The DC / DC converter a power supply that is electrically connected to the connection port, and when the solar cell module is connected to the corresponding connection port, converts DC power generated by the solar cell module into a predetermined DC power, and when the fuel cell system is connected to the corresponding connection port, converts DC power generated by the fuel cell system into the predetermined DC power; The fuel cell system includes: a fuel cell stack that generates electricity by a reaction between an anode gas supplied to an anode flow channel and a cathode gas supplied to a cathode flow channel; an auxiliary device necessary for power generation by the fuel cell stack, the auxiliary device operating by power supply from the power conditioner at startup; a low-voltage AC / DC converter that converts the AC power output by the DC / AC converter into DC power having a voltage lower than the predetermined DC power; a control device that operates using the low-voltage DC power and controls the operation of the fuel cell system based on an SOC of the storage battery, Power supply system.

2. The fuel cell system includes: an AC / DC converter that converts the AC power output by the DC / AC converter into a DC voltage used to operate the auxiliary equipment, The power supply system according to claim 1 .

3. a power generation module that generates DC power using a generator coupled to the internal combustion engine; the plurality of connection ports are connected to the solar cell module, the fuel cell system, or the power generation module; The DC / DC converter When the power generation module is connected to the corresponding connection port, the DC power generated by the power generation module is converted into the predetermined DC power; The control device controlling the operation of the power generation module based on the SOC of the storage battery; The power supply system according to claim 1 .

4. a switching unit that switches a supply destination of the AC power output from the DC / AC converter to a first load or a second load, The first load is a load to which the AC power is normally supplied, the second load is a load to which the AC power is supplied in an emergency; The power supply system according to claim 1 .

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