System and control method for hydrogen production by wind power combined with electrolysis of water and compressed energy storage

Abstract

A system for wind power combined with hydrogen production by electrolysis of water and compressed energy storage, comprising a first clutch arranged on a fan shaft, an air compressor, a gas storage tank and an expander, the first clutch being connected with the air compressor through a transmission mechanism to drive the air compressor to rotate; an output port of the air compressor is connected with an inlet of the gas storage tank, an outlet of the gas storage tank is connected with the expander, the expander is connected with a generator, and the generator is electrically connected with a power transmission and transformation device; the power transmission and transformation device is also electrically connected with a water electrolysis device to produce hydrogen by electrolysis of water, and an exhaust port of the water electrolysis device is connected with an inlet of the air compressor. The scheme of directly driving the air compressor by the impeller in idle time and preparing hydrogen by using excess electricity and compressing and storing the hydrogen can fully utilize wind power exceeding a threshold value, can convert wind energy and electric energy in idle time predicted by wind power into compressed gas energy for storage, can compensate for load fluctuation of a power grid, and can improve the ability of peak-valley control of the power grid.

Description

Technical Field

[0001] This invention relates to the field of wind power generation, and in particular to a system and control method for wind power combined with water electrolysis for hydrogen production and compressed energy storage. Background Technology

[0002] With the increasing global demand for clean energy, offshore wind power has attracted much attention due to its abundant wind resources, stable wind speeds, and lack of land-based resource consumption. However, offshore wind power also faces the problem of unstable power generation. Affected by marine meteorological conditions, the intermittency and fluctuation of wind power make it difficult to continuously and stably supply electricity to the grid. Hydrogen, as a clean and efficient energy carrier, has high energy density, can be stored on a large scale, and produces no pollution from combustion products. Seawater electrolysis technology can use electricity to electrolyze seawater to produce hydrogen. If effectively combined with offshore wind power, it will provide a feasible way to solve the energy storage and consumption problems of offshore wind power. However, existing related technologies suffer from many shortcomings, such as difficulties in site selection, insufficient available space, low system integration, low energy conversion efficiency, and poor equipment adaptability to the marine environment, which hinder the coordinated development of offshore wind power and hydrogen energy storage. Chinese patent application document CN116816601 A describes a wind power station system based on compressed air and hydrogen production combined energy storage and its working method. It describes the integration scheme of wind power and hydrogen production and storage. However, the scheme does not propose how to use the wind turbine to drive the compressor, and the thermal efficiency of combustion to generate electricity in the hydrogen gas turbine cycle module is low. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a system for producing hydrogen by combining wind power with water electrolysis and compression energy storage, which can realize multiple working modes including hydrogen production and storage, overcome the technical difficulty of transporting hydrogen, make full use of wind energy, and dynamically adjust the working mode according to the grid demand.

[0004] Another technical problem to be solved by the present invention is to provide a control method for a system that combines wind power with water electrolysis for hydrogen production and compressed energy storage. This method can dynamically adjust the working mode of the system according to the wind speed and wind power prediction at the station and the grid demand, so as to make full use of wind energy, increase the overall power generation, and compensate for grid load fluctuations.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a system for wind power combined with water electrolysis to produce hydrogen and compressed energy storage, including a first clutch, an air compressor, a gas storage tank and an expander installed on the wind turbine shaft, wherein the first clutch is connected to the air compressor through a transmission mechanism to drive the air compressor to rotate;

[0006] The air compressor's output port is connected to the gas storage tank's inlet, the gas storage tank's outlet is connected to the expander, the expander is connected to the generator, and the generator is electrically connected to the power transmission and transformation equipment.

[0007] The power transmission and transformation equipment is also electrically connected to the water electrolysis unit to produce hydrogen by electrolyzing water. The exhaust port of the water electrolysis unit is connected to the inlet of the air compressor.

[0008] In a preferred embodiment, the gas storage tank is located inside the wind turbine tower;

[0009] There are at least two gas storage tanks, including an oxygen storage tank and a hydrogen storage tank. The exhaust port of the water electrolysis unit is connected to the air separation unit. The hydrogen exhaust port and oxygen exhaust port of the air separation unit are connected to the inlet of the air compressor through a switching valve group.

[0010] The air compressor outlet is connected to the hydrogen and oxygen storage tanks via a switching valve assembly.

[0011] In the preferred embodiment, the air separation unit is equipped with an oxygen sensor and a hydrogen sensor;

[0012] The hydrogen sensor is located below the oxygen sensor;

[0013] When the hydrogen sensor detects a hydrogen signal, the switching valve group switches the hydrogen exhaust port to exhaust gas to the air compressor, and at the same time switches the switching valve group to connect the air compressor outlet to the hydrogen storage tank.

[0014] When the oxygen sensor detects an oxygen signal, the switching valve assembly switches the oxygen exhaust port to exhaust gas to the air compressor, and at the same time switches the air compressor outlet to connect to the oxygen storage tank.

[0015] In a preferred embodiment, a first heat exchanger is provided at the cylinder head of the air compressor. The first heat exchanger is connected to a heat storage tank, and the heat storage tank is connected to a second heat exchanger. The second heat exchanger is installed on the expander and is used to heat the compressed air.

[0016] In a preferred embodiment, a second clutch is also provided between the gearbox and the wind turbine generator.

[0017] In a preferred embodiment, in the air compressor, the first clutch is connected to the vertically arranged crankshaft via a transmission mechanism. Multiple cylinder heads are evenly distributed around the outer circumference of the crankshaft. The multiple cylinder heads are located in the same layer or in different layers. The crankshaft is connected to the piston via multiple connecting rods. The piston is slidably installed in the cylinder body of one of the cylinder heads. An exhaust check valve and an intake check valve are provided at the end of the cylinder body.

[0018] In a preferred embodiment, the first clutch is located upstream of the transmission. The first clutch includes an active disc that is axially slidably connected to the fan shaft. Multiple spline slide rails are provided on the outer wall of the fan shaft. Corresponding slide grooves are provided on the inner wall of the active disc. A pusher for controlling the clutch engagement is also provided on one side of the active disc. A friction clutch connection is formed between the driven disc, which is rotatably supported, and the active disc.

[0019] The driven disc is connected to the bevel gear set via a belt mechanism, and the bevel gear set is connected to the crankshaft.

[0020] In a preferred embodiment, oxygen and hydrogen storage tanks are connected to an expander to provide a partial hydrogen-oxygen mixture, which expands the gas in the combustion chamber of the expander.

[0021] The hydrogen storage tank is also connected to a hydrogen fuel cell to generate electricity from hydrogen.

[0022] A control method for a system employing the above-mentioned wind power combined with water electrolysis for hydrogen production and compressed energy storage includes the following steps:

[0023] S1, First working mode: The first clutch is disengaged, and the impeller drives the wind turbine generator to rotate through the wind turbine shaft and the gearbox. The wind turbine generator generates electricity and transmits it to the power transmission and transformation device.

[0024] Second working mode: The first clutch engages, the wind turbine generator generates electricity and transmits it to the power transmission and transformation device; at the same time, the air compressor works to compress the hydrogen and oxygen generated in the water electrolysis device and send them into the oxygen storage tank and hydrogen storage tank respectively.

[0025] The circulation pump of the heat storage tank starts, transports the heat exchange medium to the first heat exchanger for heat exchange, and stores the heat in the heat storage tank;

[0026] Third working mode: The first clutch engages the air compressor, the second clutch disengages, and the fan generator does not work;

[0027] The air compressor compresses the hydrogen and oxygen generated in the water electrolysis device and sends them into the oxygen storage tank and hydrogen storage tank respectively.

[0028] The circulation pump of the heat storage tank starts, transports the heat exchange medium to the first heat exchanger for heat exchange, and stores the heat in the heat storage tank;

[0029] Fourth working mode: Connect the oxygen and hydrogen storage tanks to the combustion chamber of the expander to prepare a hydrogen-oxygen mixture and fuel. Heat the gas to expand it and use it as the gas source for the expander. The air generator generates electricity and supplies it to the power transmission and transformation equipment.

[0030] Fifth operating mode: Connect the hydrogen storage tank to the hydrogen fuel cell, and the hydrogen fuel cell generates electricity which is then transmitted to the power transmission and transformation equipment;

[0031] S2. Switch between different working modes according to instructions.

[0032] In the preferred embodiment, S01, the first working mode is switched according to the wind speed;

[0033] Second working mode;

[0034] The fourth working mode; the fuel in the fourth working mode includes one or more combinations of biomass fuel, pulverized coal, aluminum powder, iron powder, combustible waste, etc.

[0035] A combination of the second and fourth working modes;

[0036] Or a combination of the second working mode, the fourth working mode, and the fifth working mode;

[0037] S02. Compare the wind power prediction curve with the wind power real-time monitoring curve, and formulate an energy storage charging and discharging strategy in real time based on the difference between the two. When the real-time power is surplus, control the wind turbine to switch to the third working mode to store compressed gas energy. When the real-time power is insufficient, control the wind turbine to switch to the second working mode, the fourth working mode, a combination of the second and fourth working modes, or a combination of the second and fourth working modes and the fifth working mode, so that the compressed gas can participate in power generation and release energy.

[0038] S03. Compare the real-time monitoring of power generation and grid load demand, and formulate energy storage charging and discharging strategies in real time based on the difference between the two. When the power grid load demand is less than the real-time power generation during the off-peak period, control the wind turbine to switch to the third working mode for compressed gas energy storage. When the power grid load demand is greater than the real-time power generation during the peak period, control the wind turbine to switch to the second working mode, the fourth working mode, a combination of the second and fourth working modes, or a combination of the second and fourth working modes and the fifth working mode, so that the compressed gas participates in power generation and releases energy.

[0039] This invention provides a system and control method for wind power combined with water electrolysis to produce hydrogen and compressed energy storage. By utilizing the impeller to directly drive an air compressor during idle periods and by using excess electricity to produce and compress hydrogen for storage, it can fully utilize wind power exceeding thresholds. It can convert wind and electrical energy during off-peak periods into compressed gas energy for storage, and use the stored compressed gas to compensate for the difference between predicted and actual wind power output, mitigating grid load fluctuations, improving wind farm efficiency, and enhancing grid peak-valley control capabilities. This invention employs a combined expansion turbine and hydrogen fuel cell power generation scheme. A small amount of hydrogen mixed with oxygen is used as a starter gas, allowing for complete combustion of the fuel and rapid gas expansion, driving the expansion turbine to power an air generator. Excess hydrogen serves as the fuel for the hydrogen fuel cell, achieving high conversion efficiency. This invention also uses aluminum powder as a fuel component, significantly improving the expansion turbine's efficiency without generating additional carbon emissions. The resulting alumina waste is also an important high-value working material. Through these methods, this invention achieves high resource utilization. Attached Figure Description

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0041] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0042] Figure 2 This is a schematic diagram of the air compressor part of the present invention.

[0043] Figure 3 This is a top view of the air compressor of the present invention.

[0044] Figure 4 This is a schematic diagram of the air separation device of the present invention.

[0045] Figure 5 This is a flowchart of the control method of the present invention.

[0046] Figure 6 This is a schematic diagram of the wind field-based control strategy of the present invention.

[0047] Figure 7 This is a schematic diagram of the control strategy based on power grid load of the present invention.

[0048] In the diagram: 1. First clutch; 2. Transmission; 3. Second clutch; 4. Generator; 5. Fan housing; 6. First heat exchanger; 7. Air compressor; 7. Driven disc; 701. Driven disc; 702. Spline slide rail; 703. Fan shaft; 704. Pushing device; 705. Drive belt; 706. Bevel gear set; 707. Crankshaft; 708. Connecting rod; 709. Cylinder head; 710. First heat exchanger; 711. Exhaust check valve; 712. Intake check valve; 713. Piston; 714. Cylinder block; 715. Drive disc; 716. Fan tower; 8. Circulating pump; 9. Gas storage tank; 10. Oxygen storage tank; 101. Hydrogen storage tank; 102. Heat storage tank; 11. Power transmission and transformation device; 12. Second heat exchanger; 13. Expander; 14. Air generator; 15. Water electrolysis device; 16. Air separation device; 17. Oxygen sensor; 18. Hydrogen sensor; 19. Hydrogen exhaust port; 20. Oxygen exhaust port; 21. Hydrogen fuel cell; 22. Detailed Implementation

[0049] Example 1:

[0050] like Figure 1 , 5 In the present invention, a system for producing hydrogen by combining wind power with water electrolysis and compression energy storage includes a first clutch 1, an air compressor 7, a gas storage tank 10 and an expander 14 mounted on a wind turbine shaft 704. The first clutch 1 is connected to the air compressor 7 via a transmission mechanism to drive the air compressor 7 to rotate.

[0051] Preferred, such as Figure 1 In the middle, the air compressor 7 is located inside the fan tower.

[0052] Preferred, such as Figure 1 In this configuration, the expander 14 is located outside the wind turbine tower. More preferably, for array-type wind turbine sites, multiple wind turbines can be configured with one expander 14 to improve equipment utilization efficiency. The expander 14 can compensate for power demand during periods of strong grid load demand and responds very quickly.

[0053] The output port of the air compressor 7 is connected to the inlet of the gas storage tank 10, the outlet of the gas storage tank 10 is connected to the expander 14, the expander 14 is connected to the generator, and the generator is electrically connected to the power transmission and transformation device 12.

[0054] The power transmission and transformation unit 12 is also electrically connected to the water electrolysis unit 16 to produce hydrogen by electrolyzing water. The exhaust port of the water electrolysis unit 16 is connected to the inlet of the air compressor 7.

[0055] The water electrolysis device 16 in this example can use purified water electrolysis or seawater electrolysis. When using seawater as the electrolysis feedstock, one or more of platinum-based catalysts, cobalt-based catalysts, and nitrogen-doped carbon materials are employed to improve electrolysis production efficiency. This gives the invention a significant advantage in the offshore wind power field. In particular, the combined hydrogen production and compression storage scheme can also serve as a power supply device for offshore hydrogen energy vehicles, overcoming the difficulties of hydrogen energy transportation, reducing the cost of hydrogen energy transportation, and, compared with compressed air energy storage, the energy utilization efficiency of the present invention is higher. The water electrolysis device 16 can be configured with multiple wind turbines to save investment costs and improve equipment utilization efficiency.

[0056] Preferred solutions include Figure 1 In this configuration, the gas storage tank 10 is located inside the wind turbine tower 8 to save storage space.

[0057] There are at least two gas storage tanks 10, including an oxygen storage tank 101 and a hydrogen storage tank 102. The exhaust port of the water electrolysis device 16 is connected to the air separation unit 17. The hydrogen exhaust port 20 and the oxygen exhaust port 21 of the air separation unit 17 are connected to the inlet of the air compressor 7 through a switching valve group.

[0058] The outlet of air compressor 7 is connected to hydrogen storage tank 102 and oxygen storage tank 101 via a switching valve assembly. The switching valve assembly refers to a set of valves capable of switching between different connecting pipelines. In this example, for safety, copper-core valves are preferred, and pneumatic or hydraulic valves are used to achieve automated control while ensuring safety. Air compressor 7 is also an explosion-proof air compressor, with transmission components using a copper-clad sealed housing structure, bearings using copper-based polytetrafluoroethylene bearings, and redundant grounding and anti-static structures.

[0059] Preferred solutions include Figure 4 In the air separation unit 17, an oxygen sensor 18 and a hydrogen sensor 19 are installed.

[0060] The hydrogen sensor 19 is located below the oxygen sensor 18, the hydrogen exhaust port 20 is located at the top of the inner cavity of the air separation unit 17, and the oxygen exhaust port 21 is located at the bottom of the inner cavity of the air separation unit 17. The air is separated and stored separately by taking advantage of the different specific gravities of oxygen and hydrogen to improve safety and facilitate the subsequent preparation of auxiliary combustion gas, as well as to facilitate the supply of gas source for the independent hydrogen fuel cell 22.

[0061] The method of using the air separation unit 17 is as follows: when the hydrogen sensor 19 collects a hydrogen signal, at which time the hydrogen accounts for a larger proportion in the cavity of the air separation unit 17, the switching valve group switches the hydrogen exhaust port 20 to exhaust to the air compressor 7, and at the same time the switching valve group switches to connect the outlet of the air compressor 7 to the hydrogen storage tank 102.

[0062] When oxygen sensor 18 detects an oxygen signal, indicating a higher oxygen content within the air separation unit 17, the switching valve group switches the oxygen exhaust port 21 to exhaust gas into the air compressor 7. Simultaneously, the switching valve group connects the outlet of the air compressor 7 to the oxygen storage tank 101. This scheme enables the simultaneous compression and storage of hydrogen and oxygen using a single air compressor 7.

[0063] Preferred solutions include Figure 1 In this configuration, a first heat exchanger 6 is located at the cylinder head 710 of the air compressor 7. The first heat exchanger 6 is connected to a heat storage tank 11, which in turn is connected to a second heat exchanger 13. The second heat exchanger 13 is mounted on the expander 14 and is used to heat the compressed gas. Preferably, a third heat exchanger is also provided at the exhaust port of the combustion chamber of the expander 14 to absorb and store the waste heat from the exhaust port. This structure further improves the efficiency of compressed gas power generation.

[0064] Preferred solutions include Figure 1 In this configuration, a second clutch 3 is also provided between the transmission 2 and the wind turbine generator 4. The second clutch 3 is used to disconnect the transmission between the transmission 2 and the wind turbine generator 4, so that the wind turbine generator 4 does not operate under certain operating conditions.

[0065] Preferred solutions include Figure 2 In the air compressor 7, the first clutch 1 is connected to a vertically arranged crankshaft 708 via a transmission mechanism. Multiple cylinder heads 710 are evenly distributed circumferentially around the outer periphery of the crankshaft 708, and these cylinder heads are located in the same layer. Figure 3 As shown, or not on the same layer, the crankshaft 708 is connected to the piston 714 through multiple connecting rods 709. The piston 714 is slidably mounted in the cylinder block 715 of a cylinder head 710. An exhaust one-way valve 712 and an intake one-way valve 713 are provided at the end of the cylinder block 715.

[0066] like Figure 3 In a design where multiple cylinder heads are arranged on the same layer, the crankshaft 708 is connected to the connecting rods 709 of each cylinder head 710 via a transmission disc 716. The advantage of this design is that it reduces the degree of torsion of the crankshaft 708 by reducing its diameter.

[0067] Preferred solutions include Figure 2 In the transmission 2, the first clutch 1 is located upstream of the transmission 2. The first clutch 1 includes an active disc 702 that is axially slidably connected to the fan shaft 704. Multiple spline slide rails 703 are provided on the outer wall of the fan shaft 704. Corresponding slide grooves are provided on the inner wall of the active disc 702. A pusher device 705 for controlling the clutch is also provided on one side of the active disc 702. The driven disc 701, which is rotatably supported, forms a friction clutch connection with the active disc 702.

[0068] Preferably, the pushing device 705 has two configuration methods. One method uses a cylinder or electric push rod to push the axial displacement of the driving disc 702, creating a friction transmission pair between the driving disc 702 and the driven disc 701. A tension spring is provided on one side of the driving disc 702 to disengage the driving disc 702 from the driven disc 701. This solution has the advantages of simple structure, high reliability, and the ability to achieve flexible clutch engagement. The other method involves creating a "C"-shaped groove on the back of the driving disc 702 and providing ball heads at the ends of the pushing device 705. Two to three pushing devices 705 are symmetrically arranged, and the ball heads slide within the "C"-shaped groove to drive the axial movement of the driving disc 702.

[0069] like Figure 2 In the process, the driven disc 701 is connected to the bevel gear set 707 via a belt mechanism. The bevel gear set 707 is connected to the crankshaft 708, driving the crankshaft 708 to rotate, which in turn drives each piston 714 to reciprocate.

[0070] In a preferred embodiment, oxygen storage tank 101 and hydrogen storage tank 102 are connected to expander 14 to provide a partial hydrogen-oxygen mixture, which expands in the combustion chamber of expander 14. Preferably, the hydrogen-oxygen mixture has a hydrogen concentration of 4-20%. The combustion chamber of expander 14 is equipped with nozzles to inject the hydrogen-oxygen mixture into the combustion chamber. Preferably, a fuel nozzle is also provided to inject powdered fuel into the combustion chamber. The fuel includes one or more combinations of biomass fuel, pulverized coal, aluminum powder, iron powder, and combustible waste. In this example, metal powder is preferably used, injected into the combustion chamber via powder injection. Air is used as the carrier gas, causing significant expansion of the gas in the combustion chamber to drive the turbine of expander 14. Aluminum powder is used, and the combustible material is alumina, an important industrial raw material. The hydrogen-oxygen mixture serves as the ignition component, and excess oxygen serves as the combustion-supporting component. This fully utilizes the resources of water electrolysis.

[0071] A further preferred option is an air inlet that introduces air into the combustion chamber via a pressurization device, such as a small fan.

[0072] The hydrogen storage tank 102 is also connected to the hydrogen fuel cell 22. Since compressing hydrogen to atmospheric pressure absorbs heat, a heat exchange device is installed here to heat the hydrogen using the medium in the heat storage tank 11. The hydrogen fuel cell 22 uses the excess hydrogen to generate electricity, which is then transmitted to the power transmission and transformation device 12. Multiple turbines can also share one hydrogen fuel cell 22 to improve equipment utilization, reduce investment costs, and minimize equipment downtime.

[0073] Example 2:

[0074] A control method for a system employing the above-mentioned wind power combined with water electrolysis for hydrogen production and compressed energy storage includes the following steps: The system of the present invention has multiple operating modes, including:

[0075] S1, First working mode: The first clutch 1 is disengaged, and the impeller drives the wind turbine generator 4 to rotate through the wind turbine shaft 704 and the gearbox 2. The wind turbine generator 4 generates electricity and transmits it to the power transmission and transformation device 12. This is the normal working mode.

[0076] Second operating mode: The first clutch 1 engages, and the wind turbine generator 4 generates electricity and transmits it to the power transmission and transformation unit 12; simultaneously, the air compressor 7 operates to compress the hydrogen and oxygen generated in the water electrolysis device 16 and send them to the oxygen storage tank 101 and hydrogen storage tank 102 respectively; the water electrolysis device 16 is powered by the surplus electricity generated by the power transmission and transformation unit 12 during off-peak hours. That is, when the grid load demand is low, the power generation capacity of the substation is surplus.

[0077] The circulation pump 9 of the heat storage tank 11 is started, which transports the heat exchange medium to the first heat exchanger 6 for heat exchange and stores the heat in the heat storage tank 11. This working mode is usually started when the wind speed exceeds 5m / second, which can better utilize the wind power.

[0078] Third working mode: The first clutch 1 engages the air compressor 7, the second clutch 3 disengages, and the wind turbine generator 4 does not work; at this time, the main working condition is that the power grid load is low, so the wind turbine generator no longer generates electricity and is used to compress the produced hydrogen and oxygen.

[0079] The air compressor 7 compresses the hydrogen and oxygen generated in the water electrolysis device 16 and sends them into the oxygen storage tank 101 and the hydrogen storage tank 102 respectively.

[0080] The circulation pump 9 of the heat storage tank 11 is started, which transports the heat exchange medium to the first heat exchanger 6 for heat exchange and stores the heat in the heat storage tank 11.

[0081] Fourth working mode: Connect oxygen storage tank 101 and hydrogen storage tank 102 to the combustion chamber of expander 14 to prepare hydrogen-oxygen mixture and fuel. Heat the gas to expand it as the gas source for expander. Air generator 15 generates electricity and transmits it to power transmission and transformation device 12. This working mode is used when the grid load is high and the power generation is insufficient.

[0082] Fifth operating mode: Connect the hydrogen storage tank 102 to the hydrogen fuel cell 22, and the hydrogen fuel cell 22 generates electricity and transmits it to the power transmission and transformation device 12; this operating mode is used when the grid load is high and the power generation is insufficient.

[0083] S2. Switch between different working modes according to instructions.

[0084] In the preferred embodiment, S01, the first working mode is switched according to the wind speed; this working mode is usually adopted when the wind speed is below 5 m / s.

[0085] Second working mode; This working mode is typically used when the wind speed is above 5 m / s.

[0086] The fourth operating mode; the fuel in the fourth operating mode includes one or more combinations of biomass fuel, pulverized coal, aluminum powder, iron powder, combustible waste, etc.; this operating mode is usually used when the grid load demand is strong.

[0087] The combination of the second and fourth operating modes; this operating mode is typically used when grid load demand is strong.

[0088] Alternatively, a combination of the second and fourth operating modes and the fifth operating mode; this operating mode is typically used when grid load demand is strong.

[0089] S02, such as Figure 6 In this process, the wind power prediction curve is compared with the wind power real-time monitoring curve, and an energy storage charging and discharging strategy is formulated in real time based on the difference between the two. When the real-time power is surplus, the wind turbine is controlled to switch to the third working mode to store compressed gas energy; when the real-time power is insufficient, the wind turbine is controlled to switch to the second working mode, the fourth working mode, a combination of the second and fourth working modes, or a combination of the second and fourth working modes and the fifth working mode, so that the compressed gas participates in power generation and releases energy.

[0090] S03, such as Figure 7 In this system, the power generation and grid load demand are monitored in real time, and energy storage charging and discharging strategies are formulated in real time based on the difference between the two. When the power grid load demand is less than the real-time power generation during the off-peak period, the wind turbine is controlled to switch to the third working mode for compressed gas energy storage. When the power grid load demand is greater than the real-time power generation during the peak period, the wind turbine is controlled to switch to the second working mode, the fourth working mode, a combination of the second and fourth working modes, or a combination of the second and fourth working modes and the fifth working mode, so that the compressed gas participates in power generation and releases energy.

[0091] The solution of this invention has low overall cost, high durability, high resource utilization, and can significantly reduce the capacity configuration of electrochemical energy storage.

[0092] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The embodiments and features described in these embodiments can be arbitrarily combined without conflict. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A system for wind power combined with electrolysis of water to produce hydrogen and compressed energy storage, characterized by: The system comprises a first clutch (1) arranged on a fan shaft (704), an air compressor (7), a gas storage tank (10) and an expander (14), the first clutch (1) is connected with the air compressor (7) through a transmission mechanism to drive the air compressor (7) to rotate; An outlet of the air compressor (7) is connected with an inlet of the gas storage tank (10), an outlet of the gas storage tank (10) is connected with the expander (14), the expander (14) is connected with an air generator (15), and the air generator (15) is electrically connected with a power transmission and transformation device (12); The first clutch (1) is connected with a vertically arranged crankshaft (708) through the transmission mechanism, a plurality of cylinder heads (710) are uniformly distributed on the outer periphery of the crankshaft (708), the plurality of cylinder heads are located on the same layer or different layers, the crankshaft (708) is connected with a piston (714) through a plurality of connecting rods (709), and the piston (714) is slidingly installed in a cylinder body (715) of one of the cylinder heads (710); an exhaust one-way valve (712) and an air inlet one-way valve (713) are arranged at the end of the cylinder body (715); A second clutch (3) is further arranged between the transmission (2) and the fan generator (4); The gas storage tank (10) is located in a fan tower (8); The gas storage tank (10) comprises an oxygen storage tank (101) and a hydrogen storage tank (102), an exhaust outlet of an electrolytic water device (16) is connected with an air separation device (17), a hydrogen exhaust outlet (20) and an oxygen exhaust outlet (21) of the air separation device (17) are connected with an inlet of the air compressor (7) through a switching valve group; An outlet of the air compressor (7) is connected with the hydrogen storage tank (102) and the oxygen storage tank (101) through the switching valve group; The air separation device (17) is provided with an oxygen sensor (18) and a hydrogen sensor (19); The hydrogen sensor (19) is located below the oxygen sensor (18); When the hydrogen sensor (19) collects a hydrogen signal, the switching valve group switches the hydrogen exhaust outlet (20) to exhaust air to the air compressor (7), and simultaneously switches the outlet of the air compressor (7) to communicate with the hydrogen storage tank (102); When the oxygen sensor (18) collects an oxygen signal, the switching valve group switches the oxygen exhaust outlet (21) to exhaust air to the air compressor (7), and simultaneously switches the outlet of the air compressor (7) to communicate with the oxygen storage tank (101); the power transmission and transformation device (12) is further electrically connected with the electrolytic water device (16) to electrolyze water to produce hydrogen, and an exhaust outlet of the electrolytic water device (16) is connected with an inlet of the air compressor (7).

2. The system for hydrogen production by electrolysis of water and compressed energy storage by wind power according to claim 1, characterized in that: A first heat exchanger (6) is arranged at the position of the cylinder head (710) of the air compressor (7), the first heat exchanger (6) is connected with a heat storage tank (11), the heat storage tank (11) is connected with a second heat exchanger (13), and the second heat exchanger (13) is arranged on the expander (14) and used for heating compressed air.

3. The system according to claim 2, characterized in that: The first clutch (1) is arranged upstream of the transmission (2), the first clutch (1) comprising a driving disc (702) axially slidingly connected with the fan shaft (704), a plurality of spline slide rails (703) being arranged on the outer wall of the fan shaft (704), and the inner wall of the driving disc (702) being provided with corresponding slide grooves, and a pushing device (705) for controlling the clutch being further arranged on one side of the driving disc (702), and a driven disc (701) rotatably supported being arranged between the driving disc (702) and the driving disc (702) to form a friction clutch connection; The driven disc (701) is connected with the bevel gear set (707) through a belt mechanism, and the bevel gear set (707) is connected with the crankshaft (708).

4. The system of claim 3, wherein the system further comprises a hydrogen storage tank. The oxygen storage tank (101) and the hydrogen storage tank (102) are connected with the expander (14) to provide part of the hydrogen-oxygen mixed gas, and the gas is expanded in the combustion chamber of the expander (14); The hydrogen storage tank (102) is also connected with the hydrogen fuel cell (22) for generating electric energy by using hydrogen.

5. A control method for the system for producing hydrogen by electrolysis of water combined with wind power and compressed energy storage according to claim 4, characterized in that The method comprises the following steps: S1, the first working mode: the first clutch (1) is disconnected, the impeller drives the fan generator (4) to rotate through the fan shaft (704) and the transmission (2), and the fan generator (4) generates electricity and transmits to the power transmission and transformation device (12); The second working mode: the first clutch (1) is engaged, the fan generator (4) generates electricity and transmits to the power transmission and transformation device (12); at the same time, the air compressor (7) works to compress the hydrogen and oxygen generated in the electrolytic water device (16) and send them into the oxygen storage tank (101) and the hydrogen storage tank (102) respectively; The circulating pump (9) of the heat storage tank (11) starts to deliver the heat exchange medium to the first heat exchanger (6) for heat exchange, and store the heat in the heat storage tank (11); The third working mode: the first clutch (1) is engaged with the air compressor (7), the second clutch (3) is disconnected, and the fan generator (4) does not work; The air compressor (7) works to compress the hydrogen and oxygen generated in the electrolytic water device (16) and send them into the oxygen storage tank (101) and the hydrogen storage tank (102) respectively; The circulating pump (9) of the heat storage tank (11) starts to deliver the heat exchange medium to the first heat exchanger (6) for heat exchange, and store the heat in the heat storage tank (11); The fourth working mode: the oxygen storage tank (101) and the hydrogen storage tank (102) are communicated with the combustion chamber of the expander (14), the hydrogen-oxygen mixed gas and fuel are prepared, the gas is heated and expanded as the gas source of the expander, and the air generator (15) generates electricity and transmits to the power transmission and transformation device (12); The fifth working mode: the hydrogen storage tank (102) is connected with the hydrogen fuel cell (22), and the hydrogen fuel cell (22) generates electricity and transmits to the power transmission and transformation device (12); S2, according to the instruction, the different working modes are switched.

6. The control method of the system for hydrogen production by wind power combined with electrolysis of water and compressed energy storage according to claim 5, characterized in that: S01, according to the wind speed, the first working mode is switched; The second working mode; The fourth working mode; the fuel in the fourth working mode includes one or more combinations of biomass fuel, coal powder, aluminum powder, iron powder and combustible garbage; The combination of the second working mode and the fourth working mode; Or the combination of the second working mode, the fourth working mode and the fifth working mode; S02, compare the wind power advance prediction curve with the real-time monitoring curve of wind power, and develop a real-time energy storage charging and discharging strategy according to the difference between the two; when the real-time power is surplus, control the wind turbine to switch into the third working mode to store compressed gas energy; when the real-time power is insufficient, control the wind turbine to switch into the second working mode, the fourth working mode, the combination of the second working mode and the fourth working mode, or the combination of the second working mode, the fourth working mode and the fifth working mode, so that the compressed gas participates in power generation to release energy; S03, compare the real-time monitoring power generation and the grid load demand, and develop a real-time energy storage charging and discharging strategy according to the difference between the two; when the electricity consumption is low, the grid load demand is less than the real-time power generation, control the wind turbine to switch into the third working mode to store compressed gas energy; when the electricity consumption is high, the grid load demand is greater than the real-time power generation, control the wind turbine to switch into the second working mode, the fourth working mode, the combination of the second working mode and the fourth working mode, or the combination of the second working mode, the fourth working mode and the fifth working mode, so that the compressed gas participates in power generation to release energy.

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