Multi-unit fuel cell stationary power plant and control method

Abstract

The application provides a multi-unit fuel cell fixed power supply device and a control method. The method comprises the following steps: an energy storage device supplies power to at least one initial fuel cell system, so that the initial fuel cell system enters a starting process to a loadable state after being supplied with power; the overall power demand of the rear-end power consumption equipment of the initial fuel cell system is obtained; the number of the remaining fuel cell systems that need to be started synchronously is obtained according to the overall power demand of the rear-end power consumption equipment; the demand power of the remaining fuel cell systems that need to be started synchronously is obtained; the load current of the remaining fuel cell systems that need to be started synchronously is obtained according to the demand power of the remaining fuel cell systems; the net output power of the initial fuel cell system and the accessory consumption power of the initial fuel cell system are obtained; and the initial fuel cell system supplies power to the remaining fuel cell systems, and the FCU controls the starting of the remaining fuel cell systems.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a multi-unit fuel cell fixed power supply device and a control method. BACKGROUND

[0002] As a fixed power supply, fuel cells have the characteristics of high efficiency, environmental protection, reliability and rapid response. They have more advantages than traditional fuel generators as fixed power supplies in scenarios such as residences, communication base stations, chemical parks and hospitals. As is known, in order to realize power generation, a fuel cell system needs to be equipped with power-consuming components such as air compressors and water pumps to provide oxidants and heat dissipation for the stack. Therefore, a fuel cell fixed power supply generally needs to be equipped with an energy storage device to meet the power consumption requirements of the accessories during the starting stage. When the required power is relatively large, for example, more than 200Kw, an effective technical solution is to use a multi-unit parallel form.

[0003] Currently, in order to support multiple fuel cell engines, a large energy storage device, such as a power battery with a large capacity or a high discharge rate, is generally matched.

[0004] However, a large capacity or high discharge rate of the energy storage device occupies a large space and increases the cost of the entire system. SUMMARY

[0005] The application provides a multi-unit fuel cell fixed power supply device and a control method, which can solve the problem that metal-supported single cells prepared by the impregnation method will grow and coarsen after long-term operation, causing performance degradation of the battery and affecting stability.

[0006] The technical solution provided by the application is as follows:

[0007] A multi-unit fuel cell fixed power supply device control method, the multi-unit fuel cell fixed power supply system includes at least two groups of parallel fuel cell systems, the output end of each group of fuel cell systems is connected to a DC bus through a DC / DC converter or connected to an AC bus through a DC / AC inverter and connected with a fuel cell system controller, and at least one group of fuel cell systems is connected with an energy storage device;

[0008] The method comprises:

[0009] The energy storage device supplies power to at least one initial fuel cell system, and the initial fuel cell system enters a starting process to a loadable state after being powered by the components;

[0010] The overall power requirement of the rear-end electrical equipment of the initial fuel cell system is obtained;

[0011] obtaining the remaining fuel cell systems needed to be synchronously started according to the overall power demand of the rear-end electrical equipment;

[0012] obtaining the demand power of the remaining fuel cell systems needed to be synchronously started;

[0013] obtaining the pull current of the remaining fuel cell systems needed to be synchronously started according to the demand power of the remaining fuel cell systems;

[0014] obtaining the net output power of the initial fuel cell system and the accessory consumption power of the initial fuel cell system;

[0015] supplying the remaining fuel cell systems by the initial fuel cell system according to the net output power of the initial fuel cell system, the accessory consumption power of the initial fuel cell system and the demand power of the remaining fuel cell systems, and the FCU controls the remaining fuel cell systems to start.

[0016] In an alternative embodiment, the obtaining the pull current of the remaining fuel cell systems needed to be synchronously started according to the demand power of the remaining fuel cell systems comprises obtaining the pull current of the remaining fuel cell systems needed to be synchronously started according to the demand power of the remaining fuel cell systems and a standard P-I curve obtained in advance.

[0017] In an alternative embodiment, the obtaining the pull current of the remaining fuel cell systems needed to be synchronously started according to the demand power of the remaining fuel cell systems further comprises obtaining the pull current of the remaining fuel cell systems needed to be synchronously started according to the minimum power of the initial fuel cell system under a user usage scenario.

[0018] In an alternative embodiment, the supplying the remaining fuel cell systems by the initial fuel cell system according to the net output power of the initial fuel cell system, the accessory consumption power of the initial fuel cell system and the demand power of the remaining fuel cell systems comprises:

[0019] comparing the net output power of the initial fuel cell system with the sum of the demand power and the accessory consumption power of the initial fuel cell system to obtain a comparison result;

[0020] determining whether to supply the remaining fuel cell systems by the initial fuel cell system according to the comparison result.

[0021] In an alternative embodiment, the determining whether to supply power to the remaining fuel cell systems by the initial fuel cell system according to the comparison result comprises: when the net output power of the initial fuel cell system is greater than the sum of the required power and the accessory consumption power of the initial fuel cell system, determining to supply power to the remaining fuel cell systems by the initial fuel cell system according to the comparison result.

[0022] In an alternative embodiment, the supplying power to the remaining fuel cell systems by the initial fuel cell system comprises supplying power to the remaining fuel cell systems by the initial fuel cell system according to a preset timing sequence.

[0023] In an alternative embodiment, the preset timing sequence is from small to large according to the actual power of the remaining fuel cell systems.

[0024] In another aspect, a multi-unit fuel cell fixed power system control device is provided, the multi-unit fuel cell fixed power system comprising at least two groups of parallel fuel cell systems, the output end of each group of fuel cell systems being connected to a DC bus through a DC / DC converter or to an AC bus through a DC / AC inverter and then connected to a fuel cell system controller, wherein at least one group of fuel cell systems is connected to an energy storage device;

[0025] The device comprises:

[0026] A first power supply unit for supplying power to at least one initial fuel cell system by the energy storage device, so that the initial fuel cell system enters a start-up process to a loadable state after being supplied with power;

[0027] A first acquisition unit for acquiring the overall power requirement of the rear-end power-consuming equipment of the initial fuel cell system;

[0028] A second acquisition unit for obtaining the number of remaining fuel cell systems that need to be started synchronously according to the overall power requirement of the rear-end power-consuming equipment;

[0029] A third acquisition unit for acquiring the required power of the remaining fuel cell systems that need to be started synchronously;

[0030] A fourth acquisition unit for obtaining the load current of the remaining fuel cell systems that need to be started synchronously according to the required power of the remaining fuel cell systems;

[0031] A fifth acquisition unit for acquiring the net output power of the initial fuel cell system and the accessory consumption power of the initial fuel cell system;

[0032] The sixth obtaining unit is configured to supply power to the remaining fuel cell system by the initial fuel cell system according to the net output power of the initial fuel cell system, the accessory consumption power and the demand power of the remaining fuel cell system, and the FCU controls the remaining fuel cell system to start.

[0033] In an optional embodiment, the fourth obtaining unit is configured to obtain the pull load current of the remaining fuel cell system which needs to be started synchronously according to the demand power of the remaining fuel cell system and the pre-obtained standard P-I curve.

[0034] In an optional embodiment, the fourth obtaining unit is configured to obtain the pull load current of the remaining fuel cell system which needs to be started synchronously according to the minimum power of the initial fuel cell system under a user usage scenario.

[0035] In an optional embodiment, the fourth obtaining unit is configured to

[0036] obtain a comparison result by comparing the net output power of the initial fuel cell system with the sum of the demand power of the initial fuel cell system and the accessory consumption power;

[0037] determine whether to supply power to the remaining fuel cell system by the initial fuel cell system according to the comparison result.

[0038] In an optional embodiment, the fourth obtaining unit is configured to

[0039] determine to supply power to the remaining fuel cell system by the initial fuel cell system according to the comparison result when the net output power of the initial fuel cell system is greater than the sum of the demand power of the initial fuel cell system and the accessory consumption power.

[0040] In an optional embodiment, the fourth obtaining unit is configured to

[0041] supply power to the remaining fuel cell system by the initial fuel cell system according to a preset timing sequence.

[0042] In an optional embodiment, the preset timing sequence is from small to large according to the actual power of the remaining fuel cell system.

[0043] The method provided by the embodiment of the present application has at least the following beneficial effects:

[0044] The method provided by the embodiment of the present application ensures the reliability and stability of the minimum power consumption demand supply by adopting the parallel mode of the multi-unit fuel cell system and backing up each other, and reduces the capacity demand of the energy storage device and the overall cost of the machine by comprehensively matching the capacity selection and starting sequence of the energy storage device. BRIEF DESCRIPTION OF DRAWINGS

[0045] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference characters refer to like parts throughout the figures, exemplary embodiments of the present disclosure are shown.

[0046] Figure 1 A multi-unit fuel cell fixed power supply device control method flow chart is shown;

[0047] Figure 2 A multi-unit fuel cell fixed power supply device control method flow chart is shown;

[0048] Figure 3 A multi-unit fuel cell fixed power supply system structure block diagram is shown. DETAILED DESCRIPTION

[0049] Embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which like reference characters refer to like parts throughout the several views. While the disclosure is susceptible to various modifications and alternative forms, specific embodiments hereof are shown by way of example in the drawings and will be described in detail herein. It should be understood that the drawings and detailed description thereto are not intended to limit the disclosure to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.

[0050] The term "including" and its variants are meant to encompass non-exclusive inclusions, i.e., that the listed items are among those that can be included, but that other items not expressly listed are also among those that can be included. The term "or" means "and / or". The term "based on" means "based, at least in part, on". The terms "one example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "a first", "a second", etc. do not require that there be only one of the identified objects. Other definitions can be found in the detailed description.

[0051] Please refer to Figure 1 , Figure 1 A multi-unit fuel cell fixed power supply device control method flow chart is provided for the embodiments of the present disclosure. The multi-unit fuel cell fixed power supply system includes at least two groups of parallel fuel cell systems, the output end of each group of fuel cell systems is connected to a DC bus through a DC / DC converter or connected to an AC bus through a DC / AC inverter and connected with a fuel cell system controller, and at least one group of fuel cell systems is connected with an energy storage device.

[0052] The method includes:

[0053] S101, the energy storage device supplies power to at least one initial fuel cell system, and after the initial fuel cell system is powered, the initial fuel cell system enters a start-up process to a loadable state.

[0054] S102, acquire the overall power demand of the initial fuel cell system rear-end power consuming equipment.

[0055] S103, obtain the number of remaining fuel cell systems that need to be started synchronously according to the overall power demand of the rear-end power consuming equipment.

[0056] S104, acquire the demand power of the remaining fuel cell systems that need to be started synchronously.

[0057] S105, obtain the pull load current of the remaining fuel cell systems that need to be started synchronously according to the demand power of the remaining fuel cell systems.

[0058] S106, acquire the net output power of the initial fuel cell system and the accessory consumption power of the initial fuel cell system.

[0059] S107, supply power to the remaining fuel cell systems through the initial fuel cell system according to the net output power of the initial fuel cell system, the accessory consumption power and the demand power of the remaining fuel cell systems, and control the remaining fuel cell systems to start by the FCU.

[0060] The method provided by the embodiment of the present application has at least the following beneficial effects:

[0061] The method provided by the embodiment of the present application ensures the reliability and stability of the minimum power consumption demand supply by adopting the parallel connection mode of the multi-unit fuel cell system and serving as backup for each other, and reduces the capacity demand of the energy storage device and the overall machine cost to the greatest extent by comprehensively matching the capacity selection and starting sequence of the energy storage device.

[0062] The method provided by the embodiment of the present application is further explained and described below through optional embodiments.

[0063] It should be noted that the fuel cell system provided by the embodiment of the present application is at least two groups, and the two groups of fuel cell systems are connected in parallel, for example, the fuel cell system can also be multiple groups, such as three groups, four groups, five groups, etc., and the specific number can be set according to user needs, the multiple groups of fuel cell systems are connected in parallel, and the output end of each group of fuel cell systems is connected to the DC bus through a DC / DC converter or connected to the AC bus through a DC / AC inverter and then connected with a fuel cell system controller, wherein at least one group of fuel cell systems is connected with an energy storage device. The at least one group of fuel cell systems connected with the energy storage device provided by the embodiment of the present application supplies power to the fuel cell system, drives the remaining fuel cell systems to operate after the fuel cell system operates, reduces the power demand of the energy storage device, and reduces the cost.

[0064] S101, the energy storage device supplies power to at least one initial fuel cell system, and the initial fuel cell system enters a start-up process to a loadable state after being powered.

[0065] In an alternative embodiment, the initial fuel cell system powered by the energy storage device can be selected according to the actual power of the multiple groups of fuel cell systems. As an example, the initial power can be selected in descending order of actual power. Based on the selection of the fuel cell system with larger power as the initial fuel cell system, it is more convenient to generate power for the subsequent remaining fuel cell after the initial fuel cell system is running, reducing the power consumption of the initial fuel cell system.

[0066] Further, the power of the energy storage device is not less than the sum of the power of all selected initial fuel cell systems. As an example, when two initial fuel cells are selected, the power of the energy storage device is not less than the sum of the power of the two selected initial fuel cell systems.

[0067] In an alternative embodiment, the energy storage device can be a power battery, a storage battery, or a super capacitor, a flywheel.

[0068] S102, obtaining the overall power demand of the power-consuming equipment at the rear end of the initial fuel cell system.

[0069] It can be understood that after the initial fuel cell system is determined, the energy storage device needs to supply power to the initial fuel cell system. When the initial fuel cell system is determined, power needs to be supplied to the power-consuming equipment at the rear end of the initial fuel cell system and the remaining fuel cell system, so the overall power demand of the power-consuming equipment at the rear end of the initial fuel cell system needs to be obtained. As an example, the overall power demand of the power-consuming equipment at the rear end can be obtained according to the equipment nameplate marking.

[0070] S103, obtaining the number of remaining fuel cell systems that need to be started synchronously according to the overall power demand of the power-consuming equipment at the rear end.

[0071] It can be understood that when the overall power demand of the power-consuming equipment at the rear end is known, the number of remaining fuel cell systems can be obtained by dividing the power of one fuel cell system.

[0072] S104, obtaining the demand power of the remaining fuel cell systems that need to be started synchronously.

[0073] It should be noted that based on the initial fuel cell system generating power for the remaining fuel cell systems that have not been started, the demand power of the remaining fuel cell systems needs to be obtained.

[0074] S105, obtaining the load current of the remaining fuel cell systems that need to be started synchronously according to the demand power of the remaining fuel cell systems.

[0075] In an alternative embodiment, the pull current of the remaining fuel cell system required for synchronous starting is obtained according to the required power of the remaining fuel cell system, comprising obtaining the pull current of the remaining fuel cell system required for synchronous starting according to the required power of the remaining fuel cell system and the pre-obtained standard P-I curve.

[0076] It can be understood that each fuel cell system has a pre-calibrated P-I curve, according to which the pull current of the fuel cell can be obtained under the premise of a known required power.

[0077] In an alternative embodiment, the pull current of the remaining fuel cell system required for synchronous starting is obtained according to the required power of the remaining fuel cell system, further comprising obtaining the pull current of the remaining fuel cell system required for synchronous starting according to the minimum power of the initial fuel cell system under a user usage scenario.

[0078] It should be noted that the fuel cell system needs to meet the power required by its own accessories when the fuel cell stack is used, which is the minimum power of the initial fuel cell, and the minimum power of the initial fuel cell is different under different user usage scenarios. Therefore, the minimum power of the initial fuel cell is determined according to the user usage scenario, and the minimum power is used as a common condition to determine the pull current of the remaining fuel cell system required for synchronous starting, so as to avoid that the pull current is too small to cause the remaining fuel cell system to fail to start.

[0079] In an alternative embodiment, the initial fuel cell system supplies power to the remaining fuel cell system according to the net output power of the initial fuel cell system, the accessory consumption power and the required power of the remaining fuel cell system, comprising:

[0080] comparing the net output power of the initial fuel cell system with the sum of the required power of the initial fuel cell system and the accessory consumption power to obtain a comparison result;

[0081] determining whether to supply power to the remaining fuel cell system by the fuel cell system according to the comparison result.

[0082] In an alternative embodiment, determining whether to supply power to the remaining fuel cell system by the fuel cell system according to the comparison result, comprising: when the net output power of the initial fuel cell system is greater than the sum of the required power of the initial fuel cell system and the accessory consumption power, determining to supply power to the remaining fuel cell system by the fuel cell system according to the comparison result.

[0083] S106, obtaining the net output power of the initial fuel cell system and the accessory consumption power of the initial fuel cell system.

[0084] It can be understood that the initial fuel cell system not only generates power for the remaining fuel cell system to drive the remaining fuel cell system to work when working, but also meets the working requirements of its own accessories such as fuel cell stacks and fuel cell engines, and the like, and therefore, the net output power of the initial fuel cell system and the accessory consumption power of the initial fuel cell system are obtained to better supply power to the remaining fuel cell system.

[0085] S107, supplying power to the remaining fuel cell system by the initial fuel cell system according to the net output power of the initial fuel cell system, the accessory consumption power and the demand power of the remaining fuel cell system, and the FCU controls the remaining fuel cell system to start.

[0086] In an optional embodiment, the supplying power to the remaining fuel cell system by the initial fuel cell system comprises supplying power to the remaining fuel cell system by the initial fuel cell system according to a preset time sequence.

[0087] The fuel cell system provided by the embodiment of the present application is multiple groups, and the supplying power to the remaining fuel cell system by the initial fuel cell system according to the preset time sequence can improve the utilization rate of the fuel cell system, improve the use efficiency of the fuel cell system and reduce the use cost.

[0088] In an optional embodiment, the preset time sequence is from small to large according to the actual power of the remaining fuel cell system. Further, the preset time sequence can also be from large to small according to the demand power of the remaining fuel cell system.

[0089] Please refer to Figure 2 , Figure 2 The control method of the multiple unit fuel cell fixed power supply device provided by the embodiment of the present application is shown in the specific flowchart.

[0090] As Figure 2 shown, S01, starting, that is, after the fuel cell system is started, S02 is entered.

[0091] S02, battery power supply, FcS1 module starts to enter the run state, that is, the energy storage device supplies power to the initial fuel cell system, and the initial fuel cell system, that is, the FcS1 module, starts to enter the running state.

[0092] S03, the FCU calculates how many modules n need to be started according to Preq. That is, the fuel cell controller calculates how many fuel cell system modules n need to be started according to the overall power demand Preq of the rear-end electrical equipment.

[0093] S04, load current I. That is, the load current I of the remaining fuel cell system which needs to be started synchronously is obtained according to the demand power of the remaining fuel cell system, and the load current I of the remaining fuel cell system is loaded according to the load current.

[0094] S05, judging Pnet>Pmin+Pbop*n. Wherein, Pnet is the net output power of the initial fuel cell system, Pmin is the demand power of the initial fuel cell system, Pbop is the accessory power consumption of the initial fuel cell system. When Pnet>Pmin+Pbop*n, S06 is executed.

[0095] S06, starting FcS2~FcSn according to the demand, that is, supplying power to the residual fuel cell system by the initial fuel cell system according to the net output power of the initial fuel cell system, the accessory power consumption and the demand power of the residual fuel cell system, and the FCU controls the residual fuel cell system FcS2~FcSn to start.

[0096] S07, distributing and loading current I to each module by the FCU, that is, distributing and loading current I to the residual fuel cell system by the FCU.

[0097] S08, when Pnet>Pmin+Pbop*n, S09 is executed, and the running receives the command to shut down.

[0098] Please refer to Figure 3 , Figure 3 The multiple unit fuel cell fixed power system control device block diagram provided by the embodiment of the application.

[0099] In another aspect, a multiple unit fuel cell fixed power system control device is provided, the multiple unit fuel cell fixed power system includes at least two groups of parallel fuel cell systems, the output end of each group of fuel cell systems is connected to a DC bus through a DC / DC converter in parallel, or is connected to an AC bus through a DC / AC inverter and then connected with a fuel cell system controller, wherein at least one group of fuel cell systems is connected with an energy storage device;

[0100] The device includes:

[0101] The first power supply unit 301 is configured to supply power to the at least one initial fuel cell system by the energy storage device, so that the initial fuel cell system is powered and enters a starting process to a loadable state.

[0102] The first acquisition unit 302 is configured to acquire the overall power demand of the rear-end power consumption equipment of the initial fuel cell system.

[0103] The second acquisition unit 303 is configured to obtain the number of residual fuel cell systems that need to be started synchronously according to the overall power demand of the rear-end power consumption equipment.

[0104] The third acquisition unit 304 is configured to acquire the demand power of the residual fuel cell systems that need to be started synchronously.

[0105] The fourth obtaining unit 305 is configured to obtain the pull load current of the remaining fuel cell system which needs to be synchronously started according to the required power of the remaining fuel cell system.

[0106] The fifth obtaining unit 306 is configured to obtain the net output power of the initial fuel cell system and the accessory consumption power of the initial fuel cell system.

[0107] The sixth obtaining unit 307 is configured to supply power to the remaining fuel cell system by the initial fuel cell system according to the net output power of the initial fuel cell system, the accessory consumption power and the required power of the remaining fuel cell system, and the FCU controls the starting of the remaining fuel cell system.

[0108] In an alternative embodiment, the fourth obtaining unit is configured to obtain the pull load current of the remaining fuel cell system which needs to be synchronously started according to the required power of the remaining fuel cell system and the standard P-I curve obtained in advance.

[0109] In an alternative embodiment, the fourth obtaining unit is configured to obtain the pull load current of the remaining fuel cell system which needs to be synchronously started according to the minimum power of the initial fuel cell system under the user's use scenario.

[0110] It should be noted that the first power supply unit 101 provided by the embodiments of the present application is a driving device of the fuel cell power supply device, that is, the first power supply unit can control the start-stop or normal operation of the fuel cell power supply device. Further, the first power supply unit is a control manager of the energy storage device.

[0111] The above has described the embodiments of the present disclosure, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles, practical application or technical improvement in the market of the embodiments, or to enable other ordinary skilled in the art to understand the embodiments disclosed herein.

Claims

1. A method of controlling a multi-unit fuel cell stationary power plant, characterized by, The multi-unit fuel cell fixed power system comprises at least two groups of parallel fuel cell systems, the output ends of each group of the fuel cell systems are connected to a DC bus through a DC / DC converter or to an AC bus through a DC / AC inverter and then connected to a fuel cell system controller, wherein at least one group of the fuel cell systems is connected to an energy storage device; The method comprises: The energy storage device supplies power to at least one initial fuel cell system, and the initial fuel cell system enters a starting process to a loadable state after being supplied with power; The overall power demand of the rear-end power-consuming equipment of the initial fuel cell system is obtained; The number of remaining fuel cell systems that need to be started synchronously is obtained according to the overall power demand of the rear-end power-consuming equipment; The demand power of the remaining fuel cell systems that need to be started synchronously is obtained; The load current of the remaining fuel cell systems that need to be started synchronously is obtained according to the demand power of the remaining fuel cell systems. The net output power of the initial fuel cell system and the accessory consumption power of the initial fuel cell system are obtained; The remaining fuel cell systems are supplied with power by the initial fuel cell system according to the net output power of the initial fuel cell system, the accessory consumption power of the initial fuel cell system and the demand power of the remaining fuel cell systems, and the FCU controls the starting of the remaining fuel cell systems.

2. The method of claim 1, wherein, The load current of the remaining fuel cell systems that need to be started synchronously is obtained according to the demand power of the remaining fuel cell systems and a standard P-I curve obtained in advance.

3. The method of claim 2, wherein, The load current of the remaining fuel cell systems that need to be started synchronously is obtained according to the minimum power of the initial fuel cell system under a user usage scenario.

4. The method of claim 1, wherein, The remaining fuel cell systems are supplied with power by the initial fuel cell system according to the net output power of the initial fuel cell system, the accessory consumption power of the initial fuel cell system and the demand power of the remaining fuel cell systems, and the FCU controls the starting of the remaining fuel cell systems. The comparison result is obtained by comparing the net output power of the initial fuel cell system with the sum of the demand power and the accessory consumption power of the initial fuel cell system. It is determined whether to supply the remaining fuel cell systems with power by the initial fuel cell system according to the comparison result.

5. The method of claim 4, wherein, When the net output power of the initial fuel cell system is greater than the sum of the demand power and the accessory consumption power of the initial fuel cell system, it is determined to supply the remaining fuel cell systems with power by the initial fuel cell system according to the comparison result.

6. The method of claim 1, wherein, The remaining fuel cell systems are supplied with power by the initial fuel cell system according to a preset time sequence.

7. The method of claim 6, wherein, The preset sequence is from small to large according to the actual power of the remaining fuel cell systems.

8. A multi-unithost fuel cell stationary power system control device, characterized by comprising: The multi-unit fuel cell fixed power system comprises at least two groups of parallel fuel cell systems, the output ends of each group of fuel cell systems are connected to a DC bus through a DC / DC converter or connected to an AC bus through a DC / AC inverter and then connected to a fuel cell system controller, and at least one group of fuel cell systems is connected to an energy storage device. The device comprises: A first power supply unit is configured to supply power to at least one initial fuel cell system by the energy storage device, so that the initial fuel cell system enters a starting process to a loadable state after being powered by components; A first acquisition unit is configured to acquire the overall power demand of the rear-end power consumption equipment of the initial fuel cell system; A second acquisition unit is configured to obtain the number of remaining fuel cell systems that need to be started synchronously according to the overall power demand of the rear-end power consumption equipment; A third acquisition unit is configured to acquire the demand power of the remaining fuel cell systems that need to be started synchronously; A fourth acquisition unit is configured to obtain the load current of the remaining fuel cell systems that need to be started synchronously according to the demand power of the remaining fuel cell systems; A fifth acquisition unit is configured to acquire the net output power of the initial fuel cell system and the accessory consumption power of the initial fuel cell system; A sixth acquisition unit is configured to supply power to the remaining fuel cell systems through the initial fuel cell system according to the net output power of the initial fuel cell system, the accessory consumption power of the initial fuel cell system, and the demand power of the remaining fuel cell systems, and the FCU controls the starting of the remaining fuel cell systems.

9. The apparatus of claim 8, wherein, The fourth acquisition unit is configured to obtain the load current of the remaining fuel cell systems that need to be started synchronously according to the demand power of the remaining fuel cell systems and the standard P-I curve obtained in advance.

10. The apparatus of claim 9, wherein, The fourth acquisition unit is configured to obtain the load current of the remaining fuel cell systems that need to be started synchronously according to the minimum power of the initial fuel cell system under the user usage scenario.

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