Off-grid hybrid electrolytic hydrogen production system

Abstract

The invention provides an off-grid hybrid electrolytic hydrogen production system. The off-grid hybrid electrolytic hydrogen production system comprises a new energy power generation unit and an energy storage unit, the electric power conversion unit converts electric energy output by the new energy power generation unit and the energy storage unit into electric energy suitable for hydrogen production, and the electrolysis unit comprises a proton exchange membrane hydrogen production module and a solid oxide electrolysis module and is used for producing hydrogen after the electric energy is introduced. And the controller controls and tracks an electric energy fluctuation value output by the new energy power generation unit through charging and discharging of the energy storage unit, so that the total electric energy fluctuation value output by the new energy power generation unit and the energy storage unit is within a set range. According to the scheme, the hydrogen production efficiency of the whole hydrogen production system can be improved, it is guaranteed that the hydrogen production system achieves off-grid operation, and the influence of power generation fluctuation of the new energy power generation unit on the hydrogen production effect is eliminated by making the total electric energy output by the new energy power generation unit and the energy storage unit fluctuate within the set range.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen preparation, and in particular to an off-grid hybrid electrolysis hydrogen production system. Background Art

[0002] Hydrogen has the characteristics of being green, low-carbon and having high energy density, so hydrogen energy has become a widely used energy source. As the demand for hydrogen energy gradually increases, research on hydrogen preparation in the prior art has become more and more extensive. The hydrogen production system currently used generally includes an electrolysis unit, which may be a proton exchange membrane electrolysis module and an alkaline water electrolysis module. Electric energy is introduced through the power grid, and the power supply of the proton exchange membrane electrolysis module and the alkaline water electrolysis module is controlled to achieve electrolytic hydrogen production. During the power-on process, the power grid will be used more frequently. However, the energy source of the power grid includes energy provided by fossil fuels, which will cause certain pollution, and the proton exchange membrane electrolysis and alkaline water electrolysis methods used in the prior art still have room for improvement in efficiency in hydrogen production. Summary of the invention

[0003] The technical problem to be solved by the present application is that the existing hydrogen production schemes have certain pollution and low hydrogen production efficiency. To this end, the present application proposes an off-grid hybrid electrolysis hydrogen production system.

[0004] In view of the above technical problems, the technical solution of the present application provides an off-grid hybrid electrolysis hydrogen production system, comprising:

[0005] A new energy power generation unit, comprising at least one power generation module driven by new energy;

[0006] Energy storage unit, used to store or release electrical energy;

[0007] A power conversion unit, whose input end is connected to the new energy power generation unit and the energy storage unit, and is used to convert the electric energy output by the new energy power generation unit and the energy storage unit into electric energy suitable for hydrogen production;

[0008] An electrolysis unit, comprising a proton exchange membrane hydrogen production module and a solid oxide electrolysis module; the input end of the electrolysis unit is connected to the output end of the power conversion unit, and the electrolysis unit generates hydrogen after receiving electric energy;

[0009] A controller is connected to the new energy power generation unit, the energy storage unit, and the power conversion unit; the controller allocates the electric energy required by the energy storage unit and the hybrid electrolysis hydrogen production system according to the output electric energy value of the new energy power generation unit; the energy storage unit is used to provide a reference voltage and frequency to the hybrid electrolysis hydrogen production system, and translate the fluctuation of the new energy power generation unit so that the total electric energy fluctuation value output by the new energy power generation unit and the energy storage unit is within a set range.

[0010] In the off-grid hybrid electrolysis hydrogen production system described in some schemes, the solid oxide electrolysis module is equipped with a reducing gas inlet; the proton exchange membrane hydrogen production module is equipped with a hydrogen outlet; the hydrogen outlet is sealed and connected to the reducing gas inlet, and the hydrogen prepared by the proton exchange membrane hydrogen production module is partially transported to the solid oxide electrolysis module.

[0011] In some embodiments of the off-grid hybrid electrolysis hydrogen production system, the electrolysis unit further comprises:

[0012] An alkaline hydrogen production module, wherein the input end of the alkaline hydrogen production module is connected to the output end of the power conversion unit.

[0013] In the off-grid hybrid electrolysis hydrogen production system described in some schemes, the alkaline hydrogen production module is equipped with a gas-liquid separator, the proton exchange membrane hydrogen production module is equipped with an oxygen outlet, and the oxygen outlet of the proton exchange membrane hydrogen production module is connected to the gas-liquid separator.

[0014] In some schemes of the off-grid hybrid electrolysis hydrogen production system, part of the cold air output by the gas-liquid separator is output to the cooling gas input port of the power conversion unit to cool the power conversion unit.

[0015] The off-grid hybrid electrolysis hydrogen production system described in some solutions also includes:

[0016] A heat exchange unit, comprising a thermal coupling connection module;

[0017] The thermal coupling connection module has energy interaction with the proton exchange membrane hydrogen production module, the solid oxide electrolysis module and the alkaline hydrogen production module;

[0018] The thermal coupling connection module includes a heat storage module, and the heat storage module includes one or more of a sensible heat storage submodule, a latent heat storage submodule and a thermochemical heat storage submodule;

[0019] The heat storage module is used to convert and store excess electrical energy into thermal energy when the electrical energy provided by the power conversion unit is greater than the electrical energy required for hydrogen production; and to release thermal energy to the proton exchange membrane hydrogen production module and / or the solid oxide electrolysis module and / or the alkaline hydrogen production module when the new energy power generation unit stops providing electrical energy.

[0020] The off-grid hybrid electrolysis hydrogen production system described in some solutions also includes:

[0021] A heat exchange network module is obtained by encapsulating the separation submodule of the proton exchange membrane hydrogen production module and the refrigeration submodule of the alkaline hydrogen production module;

[0022] The heat exchange network module is connected to the power conversion unit, and the heat exchange network module is used to cool the power conversion unit.

[0023] The off-grid hybrid electrolysis hydrogen production system described in some solutions also includes:

[0024] Water source, used to provide pure water for hydrogen production;

[0025] A pipeline, a part of which is arranged outside the power conversion unit, has an input end connected to the water source, and an output end connected to the water inlet end of the electrolysis unit.

[0026] The off-grid hybrid electrolysis hydrogen production system described in some solutions also includes:

[0027] An alkaline liquid tank, used for providing alkaline liquid to the alkaline hydrogen production module;

[0028] A part of the alkali solution delivery pipe is arranged outside the power conversion unit, an input end of which is connected to the alkali solution tank, and an output end of which is connected to an alkali solution inlet end of the alkaline hydrogen production module providing alkali solution.

[0029] In some embodiments of the off-grid hybrid electrolysis hydrogen production system, the new energy power generation unit includes a wind power generation module and a photovoltaic power generation module;

[0030] The controller tracks the output electric energy value of the new energy power generation unit to obtain an electric energy prediction value, and adjusts the required electric energy of the hybrid electrolysis hydrogen production system and the energy storage unit according to the electric energy prediction value; if the electric energy prediction value of the new energy power generation unit exceeds the actual output value, the energy storage unit is controlled to store the excess electric energy; if the electric energy prediction value is lower than the actual output value, the energy storage unit is controlled to output electric energy to supplement the required electric energy difference of the hybrid electrolysis hydrogen production system.

[0031] The technical solution of this application has the following technical effects compared with the prior art:

[0032] The off-grid hybrid electrolysis hydrogen production system provided by the present application includes a new energy power generation unit and an energy storage unit. The power conversion unit is used to convert the electric energy output by the new energy power generation unit and the energy storage unit into electric energy suitable for hydrogen production. The electrolysis unit includes a proton exchange membrane hydrogen production module and a solid oxide electrolysis module, which is used to produce hydrogen after the introduction of electric energy. The controller tracks the output electric energy value of the new energy power generation unit in real time according to the charging and discharging of the energy storage unit, so that the total electric energy fluctuation value output by the new energy power generation unit and the energy storage unit is within a set range. In the above scheme provided by the present application, the electrolysis unit includes a solid oxide electrolysis module, which has a higher hydrogen production efficiency, thereby improving the hydrogen production efficiency of the entire hydrogen production system. In addition, the scheme of the present application utilizes a power supply mode in which the new energy power generation unit and the energy storage unit are matched, which can ensure that the hydrogen production system realizes off-grid operation. Moreover, the scheme controls the energy storage unit through the controller, which can eliminate the random fluctuation of the new energy power generation unit, maintain the voltage and frequency required by the hybrid electrolysis hydrogen production system, and eliminate the influence of the power generation fluctuation of the new energy power generation unit on the hydrogen production effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of the present application, wherein:

[0034] Figure 1 This is a structural schematic diagram of an off-grid hybrid electrolysis hydrogen production system according to an embodiment of the present application;

[0035] Figure 2 This is a schematic diagram of a structure in which the hydrogen output by a proton exchange membrane hydrogen production module is used as a reducing gas for a solid oxide electrolysis module according to an embodiment of the present application;

[0036] Figure 3 This is a structural schematic diagram of an off-grid hybrid electrolysis hydrogen production system according to another embodiment of the present application;

[0037] Figure 4 This is a schematic diagram of a structure in which the oxygen output by the proton exchange membrane hydrogen production module and the alkaline hydrogen production module is used to cool the power conversion unit according to an embodiment of the present application;

[0038] Figure 5 This is a schematic diagram of the arrangement of the thermal coupling connection module according to one embodiment of the present application;

[0039] Figure 6 This is a schematic diagram of the arrangement of a heat exchange unit according to an embodiment of the present application;

[0040] Figure 7 This is a schematic diagram of a structure for cooling a power conversion unit with pure water for hydrogen production according to an embodiment of the present application;

[0041] Figure 8This is a schematic diagram of a structure for cooling a power conversion unit with an alkali solution for hydrogen production according to an embodiment of the present application;

[0042] Fig. 9 This is a schematic structural diagram of a new energy power generation unit according to an embodiment of the present application. DETAILED DESCRIPTION

[0043] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0044] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0047] An off-grid hybrid electrolysis hydrogen production system described in an embodiment of the present application is as follows: Figure 1 As shown, including:

[0048] The new energy power generation unit 10 includes at least one power generation module driven by new energy.

[0049] The energy storage unit 20 is used to store or release electrical energy.

[0050] The power conversion unit 30, whose input end is connected to the new energy power generation unit 10 and the energy storage unit 20, is used to convert the electric energy output by the new energy power generation unit 10 and the energy storage unit 20 into electric energy suitable for hydrogen production. The power conversion unit 30 may include at least one end interface for connecting the new energy power generation unit 10 and the energy storage unit 20.

[0051] The electrolysis unit 40 includes a proton exchange membrane hydrogen production module 401 and a solid oxide electrolysis module 402; the input end of the electrolysis unit 40 is connected to the output end of the power conversion unit 30, and the electrolysis unit 40 generates hydrogen after receiving electrical energy. Among them, the capacity of the proton exchange membrane hydrogen production module 401 of the electrolysis unit 40 accounts for more than 20%. The power conversion unit 30 includes a voltage conversion circuit, including electrical interfaces that match different hydrogen production modules in the electrolysis unit 40, and the electrical interfaces are adaptively selected according to the efficiency, operating range, dynamic response and other characteristics of different hydrogen production modules.

[0052] The controller 100 is connected to the new energy generation unit 10, the energy storage unit 20 and the power conversion unit 30; the controller 100 allocates the power required by the energy storage unit 20 and the power conversion unit 30 of the hybrid electrolysis hydrogen production system according to the output power value of the new energy generation unit 10, and the energy storage unit 20 is used to provide a reference voltage and frequency to the power conversion unit 30 of the hybrid electrolysis hydrogen production system to translate the fluctuation of the output power value of the new energy generation unit 10. The controller 100 and the energy storage unit 20 can be set independently or integrated in the power conversion unit 30 or the electrolysis unit 40.

[0053] The off-grid hybrid electrolysis hydrogen production system in the above embodiment includes a new energy power generation unit 10 and an energy storage unit 20. The power conversion unit 30 is used to convert the electric energy output by the new energy power generation unit 10 and the energy storage unit 20 into electric energy suitable for hydrogen production. The electrolysis unit 40 includes a proton exchange membrane hydrogen production module 401 and a solid oxide electrolysis module 402, which are used to produce hydrogen after the introduction of electric energy. The controller 100 tracks the output electric energy of the new energy power generation unit 10 according to the charge and discharge control of the energy storage unit 20, so that the total electric energy fluctuation value output by the new energy power generation unit 10 and the energy storage unit 20 is within a set range. In the above scheme, the electrolysis unit 40 includes a solid oxide electrolysis module 402, which has a higher hydrogen production efficiency, thereby improving the hydrogen production efficiency of the entire hydrogen production system. In addition, the power supply method in which the new energy power generation unit 10 and the energy storage unit 20 are matched can ensure that the hydrogen production system can achieve off-grid operation. Moreover, by controlling the energy storage unit 20 through the controller 100, the random fluctuations in power generation of the new energy power generation unit 10 can be eliminated, the voltage and frequency required by the hybrid electrolysis hydrogen production system can be maintained, the total electric energy fluctuation output by the new energy power generation unit 10 and the energy storage unit 20 can be kept within a set range, the influence of the power generation fluctuation of the new energy power generation unit 10 on the hydrogen production effect can be eliminated, and the tracking accuracy of the electric energy output by the new energy power generation unit 10 can be achieved to meet the requirements.

[0054] Some off-grid hybrid electrolysis hydrogen production systems described in the scheme, such as Figure 2 As shown, the solid oxide electrolysis module 402 is provided with a reducing gas inlet; the proton exchange membrane hydrogen production module 401 is provided with a hydrogen outlet; the hydrogen outlet is sealed and connected to the reducing gas inlet, and the hydrogen prepared by the proton exchange membrane hydrogen production module 401 is partially transported to the solid oxide electrolysis module 402. In this scheme, the start-up and shutdown time of the solid oxide electrolysis module 402 is long, and the working pressure is much lower than that of the proton exchange membrane hydrogen production module 401. The normal working condition operates at 750-800°C. In the non-steady-state transition interval such as start-up and shutdown, the anode needs reducing gas to avoid material oxidation; for this reason, this scheme introduces the hydrogen of the proton exchange membrane hydrogen production module 401 into the solid oxide electrolysis module 402, and first opens the proton exchange membrane hydrogen production module 401 at startup, and provides hydrogen as a reducing gas to the solid oxide electrolysis module 402 to avoid oxidation of the materials of the solid oxide electrolysis module 402.

[0055] Some off-grid hybrid electrolysis hydrogen production systems described in the scheme, such as Figure 3 As shown, the electrolysis unit 40 further includes an alkaline hydrogen production module 403, and the input end of the alkaline hydrogen production module 403 is connected to the output end of the power conversion unit 30. Through this solution, the types of hydrogen production modules are enriched and the hydrogen production efficiency is improved.

[0056] Some off-grid hybrid electrolysis hydrogen production systems described in the scheme, such as Figure 4 As shown, the alkaline hydrogen production module is equipped with a gas-liquid separator 404, and the proton exchange membrane hydrogen production module 401 is equipped with an oxygen outlet, and the oxygen outlet of the proton exchange membrane hydrogen production module 401 is connected to the gas-liquid separator 404. The anode-cathode pressure difference of the alkaline hydrogen production module 403 needs to be strictly controlled in the low load area. For this reason, by introducing the oxygen outlet gas of the proton exchange membrane hydrogen production module 401 into the gas-liquid separator 404 of the alkaline hydrogen production module 403, the anode-cathode pressure difference of the alkaline hydrogen production module 403 can be assisted in adjusting.

[0057] Furthermore, if Figure 4 As shown, in the off-grid hybrid electrolysis hydrogen production system, the cold air output by the gas-liquid separator 404 is partially output to the cooling gas input port of the power conversion unit 30 to cool the power conversion unit 30. Specifically, the cold air is introduced into the back plate heat exchanger of the heating device of the power conversion unit 30. This solution cools the power conversion unit 30 by recovering the coldness of the oxygen at the outlet of the gas-liquid separator 404, which can reduce the load of additional cooling water. In specific implementation, the oxygen flow rate at the outlet of the gas-liquid separator 404 is proportionally matched with the power value of the power conversion unit 30, so it has automatic negative feedback self-regulation capability.

[0058] Furthermore, if Figure 5As shown, the off-grid hybrid electrolysis hydrogen production system also includes a heat exchange unit, including a thermal coupling connection module 405. The thermal coupling connection module 405 is in contact with the proton exchange membrane hydrogen production module 401, the solid oxide electrolysis module 402 and the alkaline hydrogen production module 403. The thermal coupling connection module 405 can also be used to convert the excess electric energy into thermal energy and store it when the electric energy provided by the power conversion unit 30 is more than the electric energy required for hydrogen production; when the new energy power generation unit 10 stops providing electric energy, the thermal energy is released to the proton exchange membrane hydrogen production module 401 and / or the solid oxide electrolysis module 402 and / or the alkaline hydrogen production module 403. The thermal coupling connection module 405 can select insulating solid heat storage materials such as graphite, magnesium bricks, concrete, coal-grade materials, etc. By setting the thermal coupling connection module 405, the cascade utilization of energy can be achieved, and the heat can be moved in different times and spaces. In specific implementation, the thermal coupling connection module 405 can store heat when the electric energy provided by the new energy power generation unit 10 is abundant. When there is no wind or light, and the new energy power generation unit 10 has no electric energy output, the thermal coupling connection module 405 provides heat to the alkaline hydrogen production module 403. Because the cold start time of the alkaline hydrogen production module 403 can be as long as 1-2 hours, the alkaline hydrogen production module 403 is prevented from entering a cold state by the thermal coupling connection module 405, thereby improving the life and rapid response capability of the alkaline hydrogen production module 403. Among them, the distance between the solid oxide electrolysis module 402 and the proton exchange membrane hydrogen production module 401 can also be set closer to achieve radiation heat transfer between the two. Because the solid oxide electrolysis module 402 needs to be operated at a temperature of 750°C, it has the function of radiation heat transfer.

[0059] like Figure 6As shown, the heat exchange unit also includes a heat exchange network module 406, which is obtained by encapsulating the separation submodule of the proton exchange membrane hydrogen production module 401 and the refrigeration submodule of the alkaline hydrogen production module 403; the heat exchange network module 406 is connected to the power conversion unit 30, and the heat exchange network module 406 is used to cool the power conversion unit 30. In the present application scheme, the separation unit of the proton exchange membrane hydrogen production module 401 (such as a steam-water separation cooling function module, a circulating water heating function module, and a purification module) and the separation unit of the alkaline hydrogen production module 403 (such as a steam-water separation cooling function module, an alkali liquid circulation heating function module, and a purification function module) are jointly designed as a heat exchange network module 406, and the heat exchange network module 406 can be provided with a plurality of switching valves, and the connection or disconnection of the above-mentioned functional modules is realized by switching the valves, thereby improving the operational flexibility of the heat exchange process. The heat exchange network module 406 can be adsorption refrigeration, steam compression refrigeration, steam absorption refrigeration, steam jet refrigeration, thermoelectric refrigeration, magnetic refrigeration, acoustic refrigeration, etc. The cooling capacity of the heat exchange network module 406 can be used to cool the power conversion unit 30 to avoid the introduction of additional cooling water. The proton exchange membrane hydrogen production module 401 and the solid oxide electrolysis module are thermally coupled in the form of heat conduction or heat radiation.

[0060] like Figure 7 As shown, the off-grid hybrid electrolysis hydrogen production system described in some schemes also includes:

[0061] The water source 50 is used to provide pure water for hydrogen production. A portion of the pipeline 501 is disposed outside the power conversion unit 30, with its input end connected to the water source 50 and its output end connected to the water inlet end of the electrolysis unit 40. In this solution, room temperature pure water (no cooling water required) for hydrogen production by electrolysis first flows through the heat dissipation surface of the power conversion unit 30 to remove the heat of the power conversion unit 30 and avoid the load of additional cooling water.

[0062] like Figure 8 As shown, the off-grid hybrid electrolysis hydrogen production system described in some schemes also includes:

[0063] The alkali liquid tank 60 is used to provide alkali liquid to the alkaline hydrogen production module 403; the alkali liquid delivery pipe 601, a part of which is arranged outside the power conversion unit 30, and its input end is connected to the alkali liquid tank 60, and its output end is connected to the alkali liquid inlet end of the alkaline hydrogen production module 403. In this solution, the fresh alkali liquid or the circulating alkali liquid in the alkali liquid tank 60 flows through the heat dissipation surface of the power conversion unit 30 through the alkali liquid delivery pipe 601, so as to remove the heat of the power conversion unit 30 and avoid the load of additional cooling water.

[0064] In the above scheme, if Fig. 9As shown, the new energy power generation unit 10 in the off-grid hybrid electrolysis hydrogen production system includes a wind power generation module 101 and a photovoltaic power generation module 102; the controller 100 tracks the output electric energy value of the new energy power generation unit 10, and adjusts the output electric energy value of the energy storage unit 20 according to the tracking result; if the tracking result exceeds the set range, the energy storage unit 20 is controlled to store the excess electric energy, and if the tracking result is lower than the set range, the energy storage unit 20 is controlled to output electric energy to supplement the electric energy difference between the tracking result and the set range. Through this solution, the controller 100 can control the electric energy fluctuations generated by the wind power generation module 101 and the photovoltaic power generation module 102 within a certain range, and can achieve the same stability as the power grid, thereby replacing the power supply function of the power grid. This solution can operate stably in an off-grid state.

[0065] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. An off-grid hybrid electrolysis hydrogen production system, characterized in that: include: A new energy power generation unit, comprising at least one power generation module driven by new energy; Energy storage unit, used to store or release electrical energy; A power conversion unit, whose input end is connected to the new energy power generation unit and the energy storage unit, and is used to convert the electric energy output by the new energy power generation unit and the energy storage unit into electric energy suitable for hydrogen production; An electrolysis unit, comprising a proton exchange membrane hydrogen production module and a solid oxide electrolysis module; the input end of the electrolysis unit is connected to the output end of the power conversion unit, and the electrolysis unit generates hydrogen after receiving electric energy; A controller is connected to the new energy power generation unit, the energy storage unit, and the power conversion unit; the controller allocates the electric energy required by the energy storage unit and the hybrid electrolysis hydrogen production system according to the output electric energy value of the new energy power generation unit; the energy storage unit is used to provide a reference voltage and frequency to the hybrid electrolysis hydrogen production system, and translate the fluctuation of the new energy power generation unit so that the total electric energy fluctuation value output by the new energy power generation unit and the energy storage unit is within a set range.

2. The off-grid hybrid electrolysis hydrogen production system according to claim 1, characterized in that: The solid oxide electrolysis module is provided with a reducing gas inlet; The proton exchange membrane hydrogen production module is equipped with a hydrogen outlet; The hydrogen outlet is sealed and connected to the reducing gas inlet, and part of the hydrogen produced by the proton exchange membrane hydrogen production module is transported to the solid oxide electrolysis module.

3. The off-grid hybrid electrolysis hydrogen production system according to claim 1, characterized in that: The electrolysis unit also includes: An alkaline hydrogen production module, wherein the input end of the alkaline hydrogen production module is connected to the output end of the power conversion unit.

4. The off-grid hybrid electrolysis hydrogen production system according to claim 3, characterized in that: The alkaline hydrogen production module is equipped with a gas-liquid separator, and the proton exchange membrane hydrogen production module is equipped with an oxygen outlet, and the oxygen outlet of the proton exchange membrane hydrogen production module is connected to the gas-liquid separator.

5. The off-grid hybrid electrolysis hydrogen production system according to claim 4, characterized in that: The cold air output from the gas-liquid separator is partially output to a cooling gas input port of the power conversion unit to cool the power conversion unit.

6. The off-grid hybrid electrolysis hydrogen production system according to claim 1, characterized in that: Also includes: A heat exchange unit, comprising a thermal coupling connection module; The thermal coupling connection module has energy interaction with the proton exchange membrane hydrogen production module, the solid oxide electrolysis module and the alkaline hydrogen production module; The thermal coupling connection module includes a heat storage module, and the heat storage module includes one or more of a sensible heat storage submodule, a latent heat storage submodule and a thermochemical heat storage submodule; The heat storage module is used to convert and store excess electrical energy into thermal energy when the electrical energy provided by the power conversion unit is greater than the electrical energy required for hydrogen production; When the new energy power generation unit stops providing electric energy, heat energy is released to the proton exchange membrane hydrogen production module and / or the solid oxide electrolysis module and / or the alkaline hydrogen production module.

7. The off-grid hybrid electrolysis hydrogen production system according to claim 6, characterized in that: The heat exchange unit further comprises: A heat exchange network module is obtained by encapsulating the separation submodule of the proton exchange membrane hydrogen production module and the refrigeration submodule of the alkaline hydrogen production module; The heat exchange network module is connected to the power conversion unit, and the heat exchange network module is used to cool the power conversion unit.

8. The off-grid hybrid electrolysis hydrogen production system according to claim 1, characterized in that: Also includes: Water source, used to provide pure water for hydrogen production; A pipeline, a part of which is arranged outside the power conversion unit, has an input end connected to the water source, and an output end connected to the water inlet end of the electrolysis unit.

9. The off-grid hybrid electrolysis hydrogen production system according to any one of claims 3 to 5, characterized in that: Also includes: An alkaline liquid tank, used for providing alkaline liquid to the alkaline hydrogen production module; A part of the alkali solution delivery pipe is arranged outside the power conversion unit, an input end of which is connected to the alkali solution tank, and an output end of which is connected to an alkali solution inlet end of the alkaline hydrogen production module providing alkali solution.

10. The off-grid hybrid electrolysis hydrogen production system according to any one of claims 1 to 9, characterized in that: The new energy power generation unit includes a wind power generation module and a photovoltaic power generation module; The controller tracks the output electric energy value of the new energy power generation unit to obtain an electric energy prediction value, and adjusts the electric energy required by the hybrid electrolysis hydrogen production system and the energy storage unit according to the electric energy prediction value; If the predicted electric energy value of the new energy power generation unit exceeds the actual output value, the energy storage unit is controlled to store the excess electric energy; if the predicted electric energy value is lower than the actual output value, the energy storage unit is controlled to output electric energy to supplement the required electric energy difference of the hybrid electrolysis hydrogen production system.

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