Wind-solar high-capacity hydrogen storage system

Abstract

The utility model discloses a wind-solar high-capacity hydrogen storage system, and relates to the technical field of wind-solar power generation hydrogen storage, the wind-solar high-capacity hydrogen storage system comprises a wind power generation hydrogen production unit, a photovoltaic power generation hydrogen production unit, a filter metering unit, a hydrogen storage unit and a hydrogen using unit, the wind power generation hydrogen production unit and the photovoltaic power generation hydrogen production unit are arranged in parallel; one end of the filtering and metering unit is respectively connected with the wind power generation hydrogen production unit and the photovoltaic power generation hydrogen production unit; the hydrogen storage unit comprises a low-pressure hydrogen storage subunit and a high-pressure hydrogen storage subunit group which are connected in parallel, the low-pressure hydrogen storage subunit is used for storing 5MPa hydrogen, and the high-pressure hydrogen storage subunit group is used for storing 20MPa hydrogen; the hydrogen using unit is respectively connected with the filtering and metering unit, the low-pressure hydrogen storage subunit and the high-pressure hydrogen storage subunit in parallel. The hydrogen storage system can stably provide hydrogen with stable pressure for the hydrogen using unit, and the problem that power generation and hydrogen production cannot be achieved at night is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy wind and solar power generation and hydrogen storage, and in particular to a wind and solar power large-capacity hydrogen storage system. Background Art

[0002] my country's development of renewable energy such as wind power and solar energy has increased year by year, and the proportion of its installed power generation capacity has steadily increased year by year.

[0003] At present, for wind and solar power generation, most of the electricity generated is directly connected to the grid. When it is needed, or there is a demand for use at the back end, such as hydrogen production, electricity is drawn from the grid. Additional energy consumption will be generated when the electricity is connected to the grid and used.

[0004] In addition, the traditional wind, solar and energy storage system grid-connected control method, on the one hand, the mismatch between wind farms and grid dispatch indicators causes low efficiency in the use of new energy; the oxygen and heat generated by the hydrogen production and storage system are directly discharged, and the energy consumed by people in life cannot achieve zero carbon emissions. On the other hand, hydrogen production is not smooth and the equipment life is short; in addition, the control method does not consider extreme situations and ignores the complementarity of wind and solar energy, causing some devices in the energy storage system to be decommissioned, affecting the life of the equipment. Utility Model Content

[0005] In view of this, the main purpose of the utility model is to propose a large-capacity wind-solar hydrogen storage system, which aims to solve the technical problems of low energy utilization efficiency of traditional wind-solar energy storage systems and providing unstable pressure hydrogen to the downstream hydrogen consumption section.

[0006] To achieve the above purpose, the utility model proposes a large-capacity wind-solar hydrogen storage system, comprising:

[0007] The wind power generation hydrogen production unit uses a wind turbine to convert wind energy into mechanical energy, which is then converted into electrical energy through the wind turbine. The generated electrical energy enters the hydrogen production unit to produce hydrogen;

[0008] Photovoltaic power generation hydrogen production unit, the generated electricity enters the hydrogen production unit to produce hydrogen;

[0009] The wind power generation hydrogen production unit and the photovoltaic power generation hydrogen production unit are arranged in parallel;

[0010] A filtering and metering unit, connected to the wind power generation hydrogen production unit and the photovoltaic power generation hydrogen production unit respectively;

[0011] A hydrogen storage unit, comprising a low-pressure hydrogen storage subunit and a high-pressure hydrogen storage subunit group connected in parallel, wherein the low-pressure hydrogen storage subunit is used to store 5MPa hydrogen, and the high-pressure hydrogen storage subunit group is used to store 20MPa hydrogen;

[0012] The hydrogen-using unit is connected in parallel with the filtering and metering unit, the low-pressure hydrogen storage subunit and the high-pressure hydrogen storage subunit group respectively.

[0013] Optionally, the wind power generation hydrogen production unit comprises:

[0014] Wind power generation devices;

[0015] An aqueous solution electrolysis device comprises an electrolytic cell and a diaphragm installed in the electrolytic cell, wherein the diaphragm separates the electrolytic cell into an anode chamber and a cathode chamber, an anode electrode is installed in the anode chamber, a cathode electrode is installed in the cathode chamber, a hydrogen outlet pipe is provided on the electrolytic cell, and the hydrogen outlet pipe is connected to the hydrogen storage unit.

[0016] Optionally, the photovoltaic power generation hydrogen production unit includes a photovoltaic module, a DC combiner box, a hydrogen production power supply module and the aqueous solution electrolysis device;

[0017] The photovoltaic module is electrically connected to the input end of the aqueous solution electrolysis device through the DC combiner box, and the output end of the hydrogen production power supply module is electrically connected to the power supply end of the aqueous solution electrolysis device through a common DC bus;

[0018] The DC combiner box is used to aggregate the electrical signals output by the photovoltaic modules and transmit them to the aqueous solution electrolysis device;

[0019] The hydrogen production power supply module is used to convert the electrical signal output by the DC combiner box into a preset starting voltage when the aqueous solution electrolysis device is started, and provide the voltage to the aqueous solution electrolysis device.

[0020] Optionally, the high-pressure hydrogen storage subunit group is set to ten groups, each group of high-pressure hydrogen storage subunits includes a first hydrogen buffer tank, a hydrogen compressor, a hydrogen storage tank group and a first self-operated pressure reducing valve connected in series in sequence, the hydrogen storage tank group includes a plurality of single hydrogen storage tanks connected in series, the first hydrogen buffer tank and the hydrogen compressor are also respectively connected in series with a first pressure regulating valve and a first pressure reducing valve at both ends, the first pressure reducing valve is also connected in series between the hydrogen storage tank group and the first self-operated pressure reducing valve, and the working pressure of the hydrogen compressor is 22Mpa, and the maximum hydrogen storage pressure of the hydrogen storage tank group is 22Mpa.

[0021] Optionally, the low-pressure hydrogen storage subunit includes a second pressure regulating valve, a second hydrogen buffer tank and a second self-operated pressure reducing valve connected in series in sequence, and the front end of the second hydrogen buffer tank and the end of the second self-operated pressure reducing valve are also connected in series with a second pressure reducing valve, respectively, and the rated working pressure of the second self-operated pressure reducing valve is 5Mpa.

[0022] Optionally, the volume of the first hydrogen buffer tank and the second hydrogen buffer tank are both 100m3 , and the working pressure of the first hydrogen buffer tank and the second hydrogen buffer tank is 5Mpa.

[0023] Optionally, the wind power generation device is a three-phase wind turbine.

[0024] Optionally, the wind power generation device further includes an AC / DC transformer, and the wind power generation device is connected in series with the rectifier via the AC / DC transformer.

[0025] Optionally, the photovoltaic assembly further includes a DC / DC transformer, and the photovoltaic assembly is connected in series with the rectifier via the DC / DC transformer.

[0026] Optionally, the hydrogen consumption unit includes a hydrogen refueling station, a power station and a chemical plant.

[0027] Compared with the prior art, the beneficial effects of the utility model are:

[0028] In the technical solution of the utility model, the large-capacity wind and solar hydrogen storage system consists of a wind power generation hydrogen production unit, a photovoltaic power generation hydrogen production unit, a filtering and metering unit, a hydrogen storage unit and a hydrogen use unit. It generates electricity through wind energy or light energy, and the generated electricity is not connected to the grid, but is directly used in the hydrogen production unit to produce hydrogen. At the same time, the generated hydrogen is stored to achieve energy utilization and large-capacity hydrogen storage. The generated hydrogen is stored in a large-capacity hydrogen storage unit, which is divided into two hydrogen storage pressures of 5MPa and 20MPa. At the same time, the hydrogen storage unit can choose to take gas from a 5MPa hydrogen buffer tank or a 20MPa hydrogen storage bottle group according to the hydrogen pressure actually required by the rear-end hydrogen use unit. Compared with taking gas directly from the hydrogen production equipment, this gas use method supplies more stable hydrogen and can continuously provide stable output hydrogen for the downstream hydrogen use unit. The electricity generated by wind and solar energy is used to electrolyze water to obtain hydrogen and store or transport it. When electricity is needed, the hydrogen is converted into electricity through fuel cells or other means and transmitted to the grid or directly drives hydrogen energy terminal applications. At the same time, hydrogen storage can also effectively avoid the defect of not being able to generate electricity to produce hydrogen when there is no wind or solar energy, and directly take gas from the hydrogen storage unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 This is a schematic diagram of the overall structure of the wind-solar large-capacity hydrogen storage system provided by the utility model;

[0031] Figure 2 It is a schematic diagram of the internal structure of a wind power generation hydrogen production unit and a photovoltaic power generation hydrogen production unit in an embodiment of the utility model.

[0032] Description of Figure Numbers:

[0033] 1- Wind power generation hydrogen production unit;

[0034] 11- wind power generation device; 111- AC / DC transformer; 112- rectifier; 12- aqueous solution electrolysis device; 121- electrolytic cell; 122- diaphragm;

[0035] 2-photovoltaic power generation hydrogen production unit; 21-photovoltaic module; 211-DC / DC transformer; 22-DC combiner box; 23-hydrogen production power module;

[0036] 3- Filtration metering unit;

[0037] 4-Hydrogen storage unit;

[0038] 41-low-pressure hydrogen storage subunit; 411-second pressure regulating valve; 412-second hydrogen buffer tank; 413-second self-operated pressure reducing valve; 414-second pressure reducing valve;

[0039] 42-high-pressure hydrogen storage subunit group; 421-high-pressure hydrogen storage subunit; 4211-first hydrogen buffer tank; 4212-hydrogen compressor; 4213-hydrogen storage tank group; 4214-first self-operated pressure reducing valve; 4215-first pressure reducing valve; 4216-first pressure regulating valve.

[0040] 5-Use hydrogen unit. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0044] See also Figure 1-2 As shown, the embodiment of the utility model provides a large-capacity wind-solar hydrogen storage system, which includes a wind power generation hydrogen production unit 1, a photovoltaic power generation hydrogen production unit 2, a filtering and metering unit 3, a hydrogen storage unit 4 and a hydrogen use unit 5, wherein:

[0045] The wind power generation hydrogen production unit 1 uses a wind turbine to convert wind energy into mechanical energy, and then converts the mechanical energy into electrical energy through the wind turbine, and the generated electrical energy enters the hydrogen production unit to produce hydrogen. The photovoltaic power generation hydrogen production unit 2 uses the photovoltaic effect of solar panels to convert light energy into electrical energy, and the generated electrical energy enters the hydrogen production unit to produce hydrogen.

[0046] The filtering and metering unit 3 is connected to the wind power generation hydrogen production unit 1 and the photovoltaic power generation hydrogen production unit 2 respectively, so that during the day, hydrogen can be produced by light energy or wind energy, and the generated hydrogen passes through the filtering and metering unit 3 and enters the rear end hydrogen storage unit 4.

[0047] The hydrogen storage unit 4 includes a low-pressure hydrogen storage subunit 41 and a high-pressure hydrogen storage subunit group 42 connected in parallel, and the low-pressure hydrogen storage subunit 41 is used to store 5MPa hydrogen, and the high-pressure hydrogen storage subunit group 42 is used to store 20MPa hydrogen.

[0048] The hydrogen using unit 5 is connected in parallel with the filtering and metering unit 3 , the low-pressure hydrogen storage subunit 41 and the high-pressure hydrogen storage subunit group 42 .

[0049] like Figure 1 As shown, in the embodiment of the utility model, the wind-solar large-capacity hydrogen storage system is composed of a wind power generation hydrogen production unit 1, a photovoltaic power generation hydrogen production unit 2, a filtering and metering unit 3, a hydrogen storage unit 4 and a hydrogen use unit 5. Electricity is generated by wind energy or light energy, and the generated electricity is not connected to the grid, but is directly used in the hydrogen production unit to produce hydrogen. At the same time, the generated hydrogen is stored to achieve energy utilization and large-capacity hydrogen storage. At the same time, the generated hydrogen is stored by the large-capacity hydrogen storage unit 4, which is divided into two hydrogen storage pressures of 5MPa and 20MPa. At the same time, the hydrogen storage unit 4 can choose to take gas from a 5MPa hydrogen buffer tank or a 20MPa hydrogen storage bottle group according to the actual hydrogen pressure required by the rear-end hydrogen use unit 5. Compared with taking gas directly from the hydrogen production equipment, this gas use method provides more stable hydrogen supply and can continuously provide stable output hydrogen for the downstream hydrogen use unit 5.

[0050] Therefore, in this embodiment, the electric energy generated by wind energy and solar energy is used to electrolyze water to obtain hydrogen and store or transport it. When electric energy is needed, the hydrogen is converted into electric energy through a fuel cell or other means and transmitted to the grid or directly drives hydrogen energy terminal applications. At the same time, hydrogen storage can also effectively avoid the defect of being unable to generate electric energy to produce hydrogen when there is no wind energy or solar energy, and directly take gas from the hydrogen storage unit 4.

[0051] Furthermore, the wind power generation hydrogen production unit 1 includes a wind power generation device 11 and an aqueous solution electrolysis device 12, wherein the aqueous solution electrolysis device 12 includes an electrolytic cell 121 and a diaphragm 122 installed in the electrolytic cell 121, the diaphragm 122 separates the electrolytic cell 121 into an anode chamber and a cathode chamber, an anode electrode is installed in the anode chamber, and a cathode electrode is installed in the cathode chamber. A hydrogen outlet pipe is provided on the electrolytic cell 121, and the hydrogen outlet pipe is connected to the hydrogen storage unit 4.

[0052] Specifically, see Figure 2 As shown, in the specific scheme of the utility model, the wind power generation hydrogen production unit 1 is composed of a wind power generation device 11 and an aqueous solution electrolysis device 12. The wind power generation device 11 is an electric power equipment that converts wind energy into mechanical energy and mechanical energy into electrical energy. It has a simple structure and the size of the device can be changed according to needs. It can be used on the sea or on land. By cooperating with different fixed structures, it can achieve the purpose of generating electricity in different environments; and the aqueous solution electrolysis device 12 is composed of an electrolytic cell 121 and a diaphragm 122. The diaphragm 122 is installed in the electrolytic cell 121. The diaphragm 122 separates the electrolytic cell 121 into an anode chamber and a cathode chamber. An anode electrode is installed in the anode chamber, and a cathode electrode is installed in the cathode chamber. A hydrogen outlet pipe is provided on the electrolytic cell 121, and the hydrogen outlet pipe is connected to the hydrogen storage unit 4.

[0053] Furthermore, the photovoltaic power generation hydrogen production unit 2 includes a photovoltaic module 21, a DC junction box 22, a hydrogen production power module 23 and an aqueous solution electrolysis device 12, wherein the photovoltaic module 21 is electrically connected to the input end of the aqueous solution electrolysis device 12 through the DC junction box 22, and the output end of the hydrogen production power module 23 is electrically connected to the power end of the aqueous solution electrolysis device 12 through a common DC bus; the DC junction box 22 is used to aggregate the electrical signals output by the photovoltaic module 21 and transmit them to the aqueous solution electrolysis device 12; the hydrogen production power module 23 is used to convert the electrical signals output by the DC junction box 22 into a preset starting voltage when the aqueous solution electrolysis device 12 is started, and provide it to the aqueous solution electrolysis device 12.

[0054] Specifically, see Figure 2As shown, in the specific scheme of the utility model, the photovoltaic power generation hydrogen production unit 2 is composed of a photovoltaic module 21, a DC junction box 22, a hydrogen production power module 23 and an aqueous solution electrolysis device 12. The photovoltaic module 21 and the aqueous solution electrolysis device 12 are both connected to the DC junction box 22, wherein the photovoltaic module 21 is used for power generation; the DC junction box 22 is used to combine the DC power output by the photovoltaic module 21, and transmit the DC power to the aqueous solution electrolysis device 12; the aqueous solution electrolysis device 12 is used for electrolysis hydrogen production, and the produced hydrogen is transmitted to the hydrogen storage unit 4. The DC networking structure is simple and the power conversion links are few, so the power utilization efficiency is high and the system operation economy is high. At the same time, it can be applied to large-scale hydrogen production, which improves the stability of the system and the flexibility of hydrogen production.

[0055] At present, most photovoltaic power generation and hydrogen production systems adopt the grid-connected solution. However, under the conditions of grid-connected hydrogen production, the electricity generated by renewable energy undergoes multiple stages of conversion and transmission, resulting in large losses and low electricity utilization efficiency.

[0056] Furthermore, the high-pressure hydrogen storage sub-unit group 42 is configured as ten groups of high-pressure hydrogen storage sub-units 421, each group of high-pressure hydrogen storage sub-units 421 includes a first hydrogen buffer tank 4211, a hydrogen compressor 4212, a hydrogen storage tank group 4213 and a first self-operated pressure reducing valve 4214 connected in series in sequence, the first hydrogen buffer tank 4211 and the hydrogen compressor 4212 are also respectively connected in series with a first pressure regulating valve 4216 and a first pressure reducing valve 4215 at both ends, a first pressure reducing valve 4215 is also connected in series between the hydrogen storage tank group 4213 and the first self-operated pressure reducing valve 4214, the hydrogen storage tank group 4213 includes 15 single hydrogen storage tanks connected in series, and the working pressure of the hydrogen compressor 4212 is 22Mpa, and the maximum hydrogen storage pressure of the hydrogen storage tank group 4213 is 22Mpa.

[0057] Specifically, see Figure 1 As shown, in the specific scheme of the utility model, the high-pressure hydrogen storage subunit group 42 is set to ten groups, and each group of high-pressure hydrogen storage subunits 421 is composed of a first hydrogen buffer tank 4211, a hydrogen compressor 4212, a hydrogen storage tank group 4213, a first self-operated pressure reducing valve 4214, a first pressure reducing valve 4215 and a first pressure regulating valve 4216 connected in series, and the hydrogen storage tank group 4213 is composed of 15 single hydrogen storage tanks connected in series. The number of single hydrogen storage tanks can also be determined according to the actual hydrogen production end The capacity of producing hydrogen determines how many groups to use, and the working pressure of the hydrogen compressor 4212 is 22Mpa, and the maximum hydrogen storage pressure of the hydrogen storage tank group 4213 is 22Mpa, and the pressure range of hydrogen can be freely selected from 0-20MPa.

[0058] Furthermore, the low-pressure hydrogen storage subunit 41 includes a second pressure regulating valve 411, a second hydrogen buffer tank 412 and a second self-operated pressure reducing valve 413 which are connected in series in sequence, and the front end of the second hydrogen buffer tank 412 and the end of the second self-operated pressure reducing valve 413 are also respectively connected in series with a second pressure reducing valve 414, and the rated working pressure of the second self-operated pressure reducing valve 413 is 5Mpa.

[0059] Specifically, see Figure 2 As shown, in the specific scheme of the utility model, the low-pressure hydrogen storage subunit 41 is composed of a second pressure regulating valve 411, a second hydrogen buffer tank 412, a second self-operated pressure reducing valve 413 and a second pressure reducing valve 414. The front end of the second hydrogen buffer tank 412 and the end of the second self-operated pressure reducing valve 413 are also connected in series with the second pressure reducing valve 414, respectively, and the rated working pressure of the second self-operated pressure reducing valve 413 is 5Mpa. By setting the second self-operated pressure reducing valve 413, the hydrogen pressure can be adjusted to the required range.

[0060] Furthermore, in the specific solution of the present invention, the volume of the first hydrogen buffer tank 4211 and the second hydrogen buffer tank 412 are both 100m 3 , and the working pressure of the first hydrogen buffer tank 4211 and the second hydrogen buffer tank 412 is 5Mpa.

[0061] Furthermore, the wind power generation device 11 is a three-phase wind turbine.

[0062] Specifically, see Figure 2 As shown, in the specific solution of the utility model, the wind power generation module is a three-phase wind turbine, that is, the wind power generator set adopts a three-phase generator set. At the same time, the rectifier 112 is electrically connected to the aqueous solution electrolysis device 12 through a DC bus, so as to detect the current and voltage values ​​passing through the DC bus and adjust them to match the current working voltage of the aqueous solution electrolysis device 12.

[0063] Furthermore, the wind power generation device 11 further includes an AC / DC transformer 111 , and the wind power generation device 11 is connected in series with the rectifier 112 via the AC / DC transformer 111 .

[0064] Specifically, see Figure 2 As shown, in the specific scheme of the utility model, the electricity generated by the wind power generation device 11 provides energy for the electrolysis of water to produce hydrogen in the electrolyzer 121, and the produced hydrogen enters the hydrogen load. Since the input of the electrolyzer 121 requires direct current, and wind power generates alternating current, AC / DC conversion is required.

[0065] Furthermore, the photovoltaic assembly 21 further includes a DC / DC transformer 211, and the photovoltaic assembly 21 is connected in series with the rectifier 112 via the DC / DC transformer 211. Since photovoltaic power generation generates direct current, a fixed direct current voltage is converted into a variable direct current voltage using a DC / DC.

[0066] Furthermore, the hydrogen using unit 5 includes a hydrogen filling station, a power station and a chemical plant.

[0067] In the embodiment of the present invention, the hydrogen unit 5 can be a hydrogen filling station, a power station, a steel plant or other chemical plant, which uses a hydrogen storage system to produce hydrogen from the surplus electricity output of new energy, and stores it or provides it for use by downstream industries.

[0068] It should be noted that when the load on the power system increases, the stored hydrogen energy can also be used to generate electricity using fuel cells and fed back to the power grid. This process is clean, efficient and flexible.

[0069] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A large-capacity wind and solar hydrogen storage system, characterized in that: include: A wind power generation hydrogen production unit (1) uses a wind turbine to convert wind energy into mechanical energy, and then converts the mechanical energy into electrical energy through the wind turbine. The generated electrical energy enters the hydrogen production unit to produce hydrogen; A photovoltaic power generation hydrogen production unit (2), the generated electricity enters the hydrogen production unit to produce hydrogen; The wind power generation hydrogen production unit (1) and the photovoltaic power generation hydrogen production unit (2) are arranged in parallel; A filtering and metering unit (3) is connected to the wind power generation hydrogen production unit (1) and the photovoltaic power generation hydrogen production unit (2) respectively; A hydrogen storage unit (4), comprising a low-pressure hydrogen storage subunit (41) and a high-pressure hydrogen storage subunit group (42) connected in parallel, wherein the low-pressure hydrogen storage subunit (41) is used to store 5MPa hydrogen, and the high-pressure hydrogen storage subunit group (42) is used to store 20MPa hydrogen; The hydrogen-using unit (5) is respectively connected in parallel with the filtering and metering unit (3), the low-pressure hydrogen storage subunit (41) and the high-pressure hydrogen storage subunit group (42).

2. The wind-solar large-capacity hydrogen storage system according to claim 1 is characterized in that: The wind power generation hydrogen production unit (1) comprises: Wind power generation device (11); An aqueous solution electrolysis device (12), the aqueous solution electrolysis device (12) comprising an electrolytic cell (121) and a diaphragm (122) installed in the electrolytic cell (121), the diaphragm (122) separating the electrolytic cell (121) into an anode chamber and a cathode chamber, an anode electrode being installed in the anode chamber, a cathode electrode being installed in the cathode chamber, a hydrogen outlet pipe being provided on the electrolytic cell (121), and the hydrogen outlet pipe being connected to the hydrogen storage unit (4).

3. The wind-solar large-capacity hydrogen storage system according to claim 2 is characterized in that: The photovoltaic power generation hydrogen production unit (2) comprises a photovoltaic module (21), a DC combiner box (22), a hydrogen production power supply module (23) and the aqueous solution electrolysis device (12); The photovoltaic module (21) is electrically connected to the input end of the aqueous solution electrolysis device (12) through the DC combiner box (22), and the output end of the hydrogen production power supply module (23) is electrically connected to the power supply end of the aqueous solution electrolysis device (12) through a common DC bus; The DC combiner box (22) is used to aggregate the electrical signals output by the photovoltaic module (21) and transmit them to the aqueous solution electrolysis device (12); The hydrogen production power supply module (23) is used to convert the electrical signal output by the DC combiner box (22) into a preset starting voltage when the aqueous solution electrolysis device (12) is started, and provide the voltage to the aqueous solution electrolysis device (12).

4. The wind-solar large-capacity hydrogen storage system according to claim 1 is characterized in that: The high-pressure hydrogen storage subunit group (42) is configured to include ten groups of high-pressure hydrogen storage subunits (421), each group of the high-pressure hydrogen storage subunits (421) comprising a first hydrogen buffer tank (4211), a hydrogen compressor (4212), a hydrogen storage tank group (4213) and a first self-operated pressure reducing valve (4214) connected in series in sequence, the hydrogen storage tank group (4213) comprising a plurality of single hydrogen storage tanks connected in series, the first hydrogen buffer tank (4211) and the hydrogen compressor (4212) are further connected in series with a first pressure regulating valve (4216) and a first pressure reducing valve (4215) at both ends thereof, the first pressure reducing valve (4215) is further connected in series between the hydrogen storage tank group (4213) and the first self-operated pressure reducing valve (4214), the working pressure of the hydrogen compressor (4212) is 22 MPa, and the maximum hydrogen storage pressure of the hydrogen storage tank group (4213) is 22 MPa.

5. The wind-solar large-capacity hydrogen storage system according to claim 4 is characterized in that: The low-pressure hydrogen storage subunit (41) comprises a second pressure regulating valve (411), a second hydrogen buffer tank (412) and a second self-operated pressure reducing valve (413) which are connected in series in sequence, and a second pressure reducing valve (414) is also connected in series at the front end of the second hydrogen buffer tank (412) and the end of the second self-operated pressure reducing valve (413), respectively, and the rated working pressure of the second self-operated pressure reducing valve (413) is 5Mpa.

6. The wind-solar large-capacity hydrogen storage system according to claim 5 is characterized in that: The volumes of the first hydrogen buffer tank (4211) and the second hydrogen buffer tank (412) are both 100m 3 , and the working pressure of the first hydrogen buffer tank (4211) and the second hydrogen buffer tank (412) is 5Mpa.

7. The wind-solar large-capacity hydrogen storage system according to claim 2 is characterized in that: The wind power generation device (11) is a three-phase wind turbine.

8. The wind-solar large-capacity hydrogen storage system according to claim 7 is characterized in that: The wind power generation device (11) further comprises an AC / DC transformer (111), and the wind power generation device (11) is connected in series with a rectifier (112) via the AC / DC transformer (111).

9. The wind-solar large-capacity hydrogen storage system according to claim 3 is characterized in that: The photovoltaic assembly (21) further comprises a DC / DC transformer (211), and the photovoltaic assembly (21) is connected in series with the rectifier (112) via the DC / DC transformer (211).

10. The wind-solar large-capacity hydrogen storage system according to claim 7, characterized in that: The hydrogen using unit (5) includes a hydrogen refueling station, a power station and a chemical plant.

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