Wind power combined water electrolysis hydrogen production and compression energy storage system and control method

Abstract

A wind power and water electrolysis hydrogen production and compression energy storage combined system comprises a first clutch, an air compressor, a gas storage tank and an expansion machine which are arranged on a fan shaft, and the first clutch is 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 expansion machine, the expansion machine is connected with the generator, and the generator is electrically connected with the power transmission and transformation device. The power transmission and transformation device is further electrically connected with the water electrolysis device to produce hydrogen through water electrolysis, and an exhaust port of the water electrolysis device is connected with an inlet of the air compressor. By means of the scheme that the impeller directly drives the air compressor in the idle time and redundant electric quantity is used for preparing hydrogen and compressing and storing the hydrogen, wind power exceeding a threshold value can be fully utilized, wind energy and electric energy, predicted in the idle time, of the wind power can be converted into compressed gas energy to be stored, and load fluctuation of a power grid can be compensated; and the power grid peak valley control capability is improved.

Description

Technical Field

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

[0002] As the global demand for clean energy continues to grow, offshore wind power generation has attracted much attention due to its advantages such as abundant wind energy resources, stable wind speed and no occupation of land resources. However, offshore wind power generation also faces the problem of unstable power generation. Affected by marine meteorological conditions, the intermittent and volatile wind power makes it difficult to continuously and steadily supply its output power to the power grid. As a clean and efficient energy carrier, hydrogen has high energy storage density, can be stored on a large scale, and its combustion products are pollution-free. The electrolysis of seawater to produce hydrogen technology can use electricity to electrolyze seawater to produce hydrogen. If it can be effectively combined with offshore wind power generation, it will provide a feasible way to solve the energy storage and consumption problems of offshore wind power. However, the existing related combined technologies have many shortcomings such as difficult site selection, insufficient available space, low system integration, low energy conversion efficiency, and poor adaptability of equipment in the marine environment, which restricts the coordinated development of offshore wind power and hydrogen energy storage. Chinese patent document CN116816601 A records a wind power station system based on compressed air and hydrogen production combined energy storage and its working method, which records the integration scheme of wind power and hydrogen production energy storage. However, the scheme does not propose how to use a wind turbine to drive a compressor, and the thermal efficiency of combustion and power generation 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 that combines wind power with water electrolysis to produce hydrogen and compressed energy storage, which can realize a variety of working modes including hydrogen production and storage, and can overcome the technical difficulty that hydrogen is not easy to transport, make full use of wind energy, and can dynamically adjust the working mode according to the needs of the power grid.

[0004] Another technical problem to be solved by the present invention is to provide a control method for a system combining wind power with water electrolysis to produce hydrogen and compressed energy storage, which can dynamically adjust the working mode of the system according to the wind speed, wind power forecast and grid demand of the station, so as to make full use of wind energy, improve the comprehensive power generation and compensate for the load fluctuation of the grid.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a system combining wind power with water electrolysis to produce hydrogen and compressed energy storage, comprising a first clutch, an air compressor, a gas storage tank and an expander arranged on a fan shaft, the first clutch being connected to the air compressor through a transmission mechanism to drive the air compressor to rotate; The output port of the air compressor is connected to the inlet port of the gas storage tank, the outlet port of the gas storage tank is connected to the expander, the expander is connected to the generator, and the generator is electrically connected to the power transmission and transformation device; The power transmission and transformation device is also electrically connected to the water electrolysis device to produce hydrogen by electrolyzing water, and the exhaust port of the water electrolysis device is connected to the inlet of the air compressor.

[0006] In a preferred solution, the gas storage tank is located in the fan tower; 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 device is connected to the air separation device. The hydrogen exhaust port and the oxygen exhaust port of the air separation device are connected to the inlet of the air compressor through a switching valve group. The outlet of the air compressor is connected to the hydrogen storage tank and the oxygen storage tank through a switching valve group.

[0007] In a preferred embodiment, an oxygen sensor and a hydrogen sensor are provided in the air separation unit; The hydrogen sensor is located below the oxygen sensor; When the hydrogen sensor collects a hydrogen signal, the switching valve group switches the hydrogen exhaust port to exhaust gas to the air compressor, and at the same time, the switching valve group switches to connect the outlet of the air compressor with the hydrogen storage tank; When the oxygen sensor collects an oxygen signal, the switching valve group switches the oxygen exhaust port to exhaust air to the air compressor, and at the same time, the switching valve group switches to connect the outlet of the air compressor with the oxygen storage tank.

[0008] In a preferred solution, 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, the heat storage tank is connected to a second heat exchanger, and the second heat exchanger is provided on the expander for heating the compressed air.

[0009] In a preferred solution, a second clutch is further provided between the transmission and the wind turbine generator.

[0010] In a preferred embodiment, in the air compressor, the first clutch is connected to a vertically arranged crankshaft through a transmission mechanism, and a plurality of cylinder heads are evenly distributed along the circumference of the crankshaft. The plurality of cylinder heads are located in the same layer or in different layers. The crankshaft is connected to the piston through a plurality of connecting rods, and the piston is slidably installed in a cylinder body of a cylinder head. An exhaust check valve and an intake check valve are provided at the end of the cylinder body.

[0011] In a preferred solution, the first clutch is arranged upstream of the transmission, and the first clutch comprises a driving disc axially slidably connected to the fan shaft, a plurality of spline slide rails are arranged on the outer wall of the fan shaft, a corresponding slide groove is arranged on the inner wall of the driving disc, and a pushing device for controlling the clutch is also arranged on one side of the driving disc, and a friction clutch connection is formed between the driven disc rotatably supported and the driving disc; The driven plate is connected to the bevel gear set through a belt mechanism, and the bevel gear set is connected to the crankshaft.

[0012] In a preferred embodiment, the oxygen storage tank and the hydrogen storage tank are connected to the expander to provide part of the hydrogen-oxygen mixed gas to expand the gas in the combustion chamber of the expander; The hydrogen storage tank is also connected to a hydrogen fuel cell for generating electricity using hydrogen.

[0013] A control method for the system using the above-mentioned wind power combined with water electrolysis to produce hydrogen and compressed energy storage comprises the following steps: S1, first working mode: the first clutch is disconnected, the impeller drives the fan generator to rotate through the fan shaft and the transmission, and the fan generator generates electricity and transmits it to the power transmission device; Second working mode: The first clutch is engaged, the fan 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 to the oxygen storage tank and the hydrogen storage tank respectively; The circulating pump of the heat storage tank is started to transport the heat exchange medium to the first heat exchanger for heat exchange, and the heat is stored in the heat storage tank; The third working mode: the first clutch engages the air compressor, the second clutch is disconnected, and the fan generator does not work; The air compressor compresses the hydrogen and oxygen generated in the water electrolysis device and sends them into the oxygen storage tank and the hydrogen storage tank respectively; The circulating pump of the heat storage tank is started to transport the heat exchange medium to the first heat exchanger for heat exchange, and the heat is stored in the heat storage tank; The fourth working mode: connect the oxygen storage tank and the hydrogen storage tank to the combustion chamber of the expander, prepare the hydrogen-oxygen mixed gas and fuel, heat the gas to expand it as the gas source of the expander, and the air generator generates electricity and transmits it to the power transmission device; The fifth working mode: connect the hydrogen storage tank to the hydrogen fuel cell, and the hydrogen fuel cell generates electricity and transmits it to the power transmission and transformation device; S2. Switch to different working modes according to instructions.

[0014] In the preferred solution, S01, switching to the first working mode according to the wind speed; 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, combustible garbage, etc.; A combination of the second working mode and the fourth working mode; or a combination of the second working mode, the fourth working mode and the fifth working mode; S02. Compare the wind power prediction curve in advance with the wind power real-time monitoring curve, formulate energy storage charging and discharging strategies in real time according to the difference between the two, and 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, 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 and releases energy; S03. Compare the real-time monitored power generation and grid load demand, and formulate energy storage charging and discharging strategies in real time according to the difference between the two. When the power consumption is at a low peak, the grid load demand is less than the real-time power generation, and the wind turbine is controlled to switch to the third working mode to compress gas energy storage; when the power consumption is at a peak, the grid load demand is greater than the real-time power generation, and the wind turbine is controlled to switch to the second working mode, the fourth working mode, a combination of the second working mode and the fourth working mode, or a combination of the second working mode, the fourth working mode and the fifth working mode, so that the compressed gas participates in power generation and releases energy.

[0015] The present invention provides a system and control method for wind power combined with water electrolysis to produce hydrogen and compress energy storage. By using the impeller to directly drive the air compressor during idle time and using the excess electricity to prepare hydrogen and compress and store it, the wind power exceeding the threshold can be fully utilized, and the wind power forecast and electric energy during idle time can be converted into compressed gas energy for storage, and the stored compressed gas can make up for the difference between the wind power forecast and the actual production, make up for the load fluctuation of the power grid, improve the efficiency of the wind farm, and improve the peak and valley control ability of the power grid. The present invention adopts the scheme of combined power generation of expander and hydrogen fuel cell, and uses a small amount of hydrogen mixed with oxygen as the starting gas to make the fuel fully burn, so that the gas expands rapidly, and drives the expander to work and drive the air generator to generate electricity; and the excess hydrogen is used as the power generation raw material of the hydrogen fuel cell to achieve high conversion rate power generation. The present invention also uses aluminum powder as a component of the fuel, which greatly improves the working efficiency of the expander, and does not generate additional carbon emissions. The waste aluminum oxide generated is also an important high-value working raw material. By adopting the above scheme, the present invention has a relatively sufficient utilization rate of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic structural diagram of the air compressor part of the present invention.

[0018] Figure 3 It is a schematic diagram of the top structure of the air compressor of the present invention.

[0019] Figure 4 It is a schematic structural diagram of the air separation device of the present invention.

[0020] Figure 5 Flow chart of the control method of the present invention.

[0021] Figure 6 It is a schematic diagram of the wind farm-based control strategy of the present invention.

[0022] Figure 7 It is a schematic diagram of the control strategy based on power grid load of the present invention.

[0023] In the figure: a first clutch 1, a transmission 2, a second clutch 3, a generator 4, a fan chamber 5, a first heat exchanger 6, an air compressor 7, a driven plate 701, a driving plate 702, a spline slide rail 703, a fan shaft 704, a pushing device 705, a transmission belt 706, a bevel gear set 707, a crankshaft 708, a connecting rod 709, a cylinder head 710, a first heat exchanger 711, an exhaust check valve 712, an intake check valve 713, a piston 714, a cylinder body 715, a transmission plate 716, a fan tower 8, a circulating pump 9, a gas storage tank 10, an oxygen storage tank 101, a hydrogen storage tank 102, a heat storage tank 11, a power transmission and transformation device 12, a second heat exchanger 13, an expander 14, an air generator 15, a water electrolysis device 16, an air separation device 17, an oxygen sensor 18, a hydrogen sensor 19, a hydrogen exhaust port 20, an oxygen exhaust port 21, and a hydrogen fuel cell 22. DETAILED DESCRIPTION

[0024] Embodiment 1: like Figure 1 , 5 In the invention, a system combining wind power with water electrolysis to produce hydrogen and compressed energy storage comprises a first clutch 1, an air compressor 7, a gas storage tank 10 and an expander 14 arranged on a fan shaft 704, wherein the first clutch 1 is connected to the air compressor 7 through a transmission mechanism to drive the air compressor 7 to rotate; Preferred as Figure 1 In the figure, the air compressor 7 is located in the fan tower.

[0025] Preferred as Figure 1 In the embodiment, the expander 14 is located outside the wind turbine tower. Preferably, for an array-type wind turbine station, multiple wind turbines can be equipped with a set of expanders 14 to improve equipment utilization efficiency. The expander 14 can be used to make up for the power supply demand when the grid load demand is strong, and the response is very fast.

[0026] The output port of the air compressor 7 is connected to the inlet port 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; The power transmission and transformation device 12 is also electrically connected to the water electrolysis device 16 to produce hydrogen by electrolyzing water. The exhaust port of the water electrolysis device 16 is connected to the inlet of the air compressor 7 .

[0027] The water electrolysis device 16 in this example can use clean water electrolysis or seawater electrolysis. When seawater is used as the electrolysis raw material, one or more of platinum-based catalysts, cobalt-based catalysts, and nitrogen-doped carbon materials are used to improve the electrolysis production efficiency. So that the present invention has a greater advantage in the field of offshore wind power. In particular, the solution of combined hydrogen production and compressed storage can also become an energy supply device for offshore hydrogen energy vehicles, overcoming the difficulties of hydrogen energy transportation and reducing the cost of hydrogen energy transportation. Moreover, 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 a set of multiple wind turbines to save investment costs and improve equipment utilization efficiency.

[0028] The preferred solution is Figure 1 In the embodiment, the gas storage tank 10 is located in the fan tower 8 to save storage space of the tank; 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 device 17. The hydrogen exhaust port 20 and the oxygen exhaust port 21 of the air separation device 17 are connected to the inlet of the air compressor 7 through a switching valve group. The outlet of the air compressor 7 is connected to the hydrogen storage tank 102 and the oxygen storage tank 101 through a switching valve group. The switching valve group refers to a group of valves that can switch different connecting pipelines. In this example, to ensure safety, the valve preferably uses a copper core valve, and a pneumatic or hydraulic control valve is used to ensure safety while achieving automatic control. The air compressor 7 also uses an explosion-proof air compressor, the transmission parts use a copper-clad sealing cover structure, the bearings use copper-based polytetrafluoroethylene bearings, and a redundant grounding anti-static structure is set.

[0029] The preferred solution is Figure 4 In the air separation device 17, an oxygen sensor 18 and a hydrogen sensor 19 are provided; 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 device 17, and the oxygen exhaust port 21 is located at the bottom of the inner cavity of the air separation device 17; the different specific gravities of oxygen and hydrogen are used to separate the air and store them separately to improve safety, facilitate the subsequent preparation of auxiliary combustion gas, and facilitate the supply of gas source for the independent hydrogen fuel cell 22.

[0030] The method of using the air separation device 17 is that when the hydrogen sensor 19 collects a hydrogen signal, and at this time the hydrogen occupies a larger proportion in the cavity of the air separation device 17, the switching valve group switches the hydrogen exhaust port 20 to exhaust air to the air compressor 7, and at the same time, the switching valve group switches to connect the outlet of the air compressor 7 with the hydrogen storage tank 102; When the oxygen sensor 18 collects an oxygen signal, and at this time the oxygen occupies a larger proportion in the cavity of the air separation device 17, the switching valve group switches the oxygen exhaust port 21 to exhaust air to the air compressor 7, and at the same time the switching valve group switches to connect the outlet of the air compressor 7 with the oxygen storage tank 101. This scheme realizes the time-sharing compression of hydrogen and oxygen by a set of air compressors 7, and stores them separately.

[0031] The preferred solution is Figure 1 In the embodiment, a first heat exchanger 6 is provided at the cylinder head 710 of the air compressor 7, the first heat exchanger 6 is connected to the heat storage tank 11, the heat storage tank 11 is connected to the second heat exchanger 13, and the second heat exchanger 13 is provided on the expander 14 for heating the compressed gas. Preferably, a third heat exchanger is provided at the exhaust port of the combustion chamber of the expander 14 to absorb and store the waste heat at the exhaust port of the combustion chamber. With this structure, the efficiency of compressed gas power generation can be further improved.

[0032] The preferred solution is Figure 1 In the embodiment, a second clutch 3 is further 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 work under certain working conditions.

[0033] The preferred solution is Figure 2 In the air compressor 7, the first clutch 1 is connected to the vertically arranged crankshaft 708 through a transmission mechanism. On the outer periphery of the crankshaft 708, a plurality of cylinder heads 710 are evenly distributed along the circumference. The plurality of cylinder heads are located on the same layer. Figure 3 As shown in, or not in the same layer, the crankshaft 708 is connected to the piston 714 through multiple connecting rods 709, and the piston 714 is slidably installed in a cylinder body 715 of a cylinder head 710. An exhaust check valve 712 and an intake check valve 713 are provided at the end of the cylinder body 715.

[0034] like Figure 3 In the scheme where multiple cylinder heads are arranged in the same layer, the crankshaft 708 is connected to the connecting rod 709 of each cylinder head 710 through the transmission plate 716. The advantage of this scheme is that the degree of distortion of the crankshaft 708 can be reduced. The diameter of the crankshaft 708 is reduced.

[0035] The preferred solution is Figure 2 In the embodiment, the first clutch 1 is arranged upstream of the transmission 2, and the first clutch 1 comprises a driving disc 702 axially slidably connected to the fan shaft 704, a plurality of spline slide rails 703 are arranged on the outer wall of the fan shaft 704, a corresponding slide groove is arranged on the inner wall of the driving disc 702, and a pushing device 705 for controlling the clutch is also arranged on one side of the driving disc 702, and a friction clutch connection is formed between the driven disc 701 rotatably supported and the driving disc 702; Preferably, there are two ways to set the push device 705. One is that the push device 705 uses a cylinder or an electric push rod. The push device 705 pushes the axial displacement of the active disk 702, so that the active disk 702 and the driven disk 701 form a friction transmission pair. A tension spring is provided on one side of the active disk 702 to disengage the friction between the active disk 702 and the driven disk 701. The advantages of this solution are simple structure, high reliability, and flexible clutch. The other is to open a "C"-shaped groove on the back of the active disk 702, and set a ball head at the end of the push device 705. The push device 705 is symmetrically set with 2 to 3 balls, and the ball heads are slidably connected in the "C"-shaped groove to achieve axial movement of the driving disk 702.

[0036] like Figure 2 In the embodiment, the driven plate 701 is connected to the bevel gear set 707 through a belt mechanism, and the bevel gear set 707 is connected to the crankshaft 708, driving the crankshaft 708 to rotate, thereby driving each piston 714 to reciprocate.

[0037] In the preferred solution, the oxygen storage tank 101 and the hydrogen storage tank 102 are connected to 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; preferably, the ratio of the hydrogen-oxygen mixed gas is a hydrogen concentration of 4-20%. A nozzle is provided in the combustion chamber of the expander 14 to spray the hydrogen-oxygen mixed gas into the combustion chamber. Preferably, a fuel nozzle is also provided to spray powdered fuel into the combustion chamber. The fuel includes one or more combinations of biomass fuel, coal powder, aluminum powder, iron powder, combustible garbage, etc.; in this example, metal powder is preferably used and blown into the combustion chamber in the form of powder blowing. Air is selected as the carrier gas to greatly expand the gas in the combustion chamber to drive the turbine of the expander 14 to rotate. Aluminum powder is used, and the combustion product is aluminum oxide, which is also an important industrial raw material. The hydrogen-oxygen mixed gas is the ignition component, and the surplus oxygen is the combustion-supporting component. The resources of electrolyzed water are fully utilized.

[0038] Further preferably, there is an air inlet, and air is introduced into the combustion chamber through a booster device, such as a small fan.

[0039] The hydrogen storage tank 102 is also connected to the hydrogen fuel cell 22. Since the compressed hydrogen will absorb heat under normal pressure, a heat exchange device is provided here to heat the hydrogen using the medium in the heat storage tank 11. The hydrogen fuel cell 22 uses the surplus hydrogen to generate electricity and transmit it to the power transmission and transformation device 12. The hydrogen fuel cell 22 can also be shared by multiple wind turbines to improve the utilization rate of the equipment, reduce the investment cost, and reduce the idle rate of the equipment.

[0040] Embodiment 2: A control method for the system using the above-mentioned wind power combined with water electrolysis to produce hydrogen and compressed energy storage comprises the following steps: The system of the present invention has multiple working modes, including: S1, 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 it to the power transmission and transformation device 12. This is a normal working mode; The second working mode: the first clutch 1 is engaged, the fan generator 4 generates electricity and transmits it 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 water electrolysis device 16 and send them to the oxygen storage tank 101 and the hydrogen storage tank 102 respectively; the water electrolysis device 16 comes from the surplus electricity of the power transmission and transformation device 12 during idle time, that is, the electricity when the power grid load demand is small and the power generation capacity of the station is surplus.

[0041] The circulation pump 9 of the heat storage tank 11 is started to transport the heat exchange medium to the first heat exchanger 6 for heat exchange, and store the heat in the heat storage tank 11; usually when the wind speed exceeds 5m / second, this working mode is started to better utilize the wind power.

[0042] The third working mode: the first clutch 1 engages the air compressor 7, the second clutch 3 is disconnected, and the fan generator 4 does not work; at this time, the main working condition is that the grid load is relatively low, so the fan generator no longer generates electricity and is fully used to compress the produced hydrogen and oxygen.

[0043] The air compressor 7 works to compress the hydrogen and oxygen generated in the water electrolysis device 16 and then send them into the oxygen storage tank 101 and the hydrogen storage tank 102 respectively; The circulation pump 9 of the heat storage tank 11 is started to transport 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: connect the oxygen storage tank 101 and the hydrogen storage tank 102 to the combustion chamber of the expander 14, prepare the hydrogen-oxygen mixed gas and fuel, heat the gas to expand as the gas source of the expander, and the air generator 15 generates electricity and transmits it to the power transmission and transformation device 12; this working mode is used under conditions where the grid load is high and the power generation is insufficient.

[0044] The fifth working mode: the hydrogen storage tank 102 is connected 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 working mode is used under the condition that the grid load is high and the power generation is insufficient.

[0045] S2. Switch to different working modes according to instructions.

[0046] In the preferred solution, S01, switching to the first working mode according to the wind speed; usually, this working mode is adopted when the wind speed is below 5m / second; The second working mode: usually the wind speed is above 5m / second, this working mode is adopted; 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, combustible waste, etc.; this working mode is usually adopted when the grid load demand is strong.

[0047] A combination of the second working mode and the fourth working mode; this working mode is usually adopted when the grid load demand is strong.

[0048] Or a combination of the second working mode, the fourth working mode and the fifth working mode; this working mode is usually adopted when the grid load demand is strong.

[0049] S02, such as Figure 6 In the process, the wind power prediction curve in advance is compared with the wind power real-time monitoring curve, and the energy storage charging and discharging strategy is formulated in real time according to 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, 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 and releases energy; S03, such as Figure 7 In the process, the power generation and grid load demand are monitored in real time, and a storage charging and discharging strategy is formulated in real time according to the difference between the two. When the power consumption is in the off-peak period, the grid load demand is less than the real-time power generation, and the wind turbine is controlled to switch to the third working mode to store compressed gas energy. When the power consumption is in the peak period, the grid load demand is greater than the real-time power generation, and the wind turbine is controlled to switch to the second working mode, the fourth working mode, a combination of the second working mode and the fourth working mode, or a combination of the second working mode, the fourth working mode and the fifth working mode, so that the compressed gas participates in power generation and releases energy.

[0050] The solution of the present invention has low comprehensive cost, high durability, high resource utilization, and can significantly reduce the capacity configuration of electrochemical energy storage.

[0051] The above-mentioned embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A system combining wind power with water electrolysis to produce hydrogen and compressed energy storage, characterized by: It 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 to the air compressor (7) via a transmission mechanism to drive the air compressor (7) to rotate; The output port of the air compressor (7) is connected to the inlet port of the gas storage tank (10), the outlet port 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); The power transmission and transformation device (12) is also electrically connected to the water electrolysis device (16) to produce hydrogen by electrolyzing water, and the exhaust port of the water electrolysis device (16) is connected to the inlet port of the air compressor (7).

2. The system of wind power combined with water electrolysis to produce hydrogen and compressed energy storage according to claim 1 is characterized in that: The gas storage tank (10) is located inside the fan tower (8); 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 device (17); the hydrogen exhaust port (20) and the oxygen exhaust port (21) of the air separation device (17) are connected to the inlet of the air compressor (7) via a switching valve group; The outlet of the air compressor (7) is connected to the hydrogen storage tank (102) and the oxygen storage tank (101) via a switching valve group.

3. The system of wind power combined with water electrolysis to produce hydrogen and compressed energy storage according to claim 2 is characterized by: An oxygen sensor (18) and a hydrogen sensor (19) are provided in the air separation device (17); 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 port (20) to exhaust gas 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); When the oxygen sensor (18) collects an oxygen signal, the switching valve group switches the oxygen exhaust port (21) to exhaust air 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 oxygen storage tank (101).

4. The system of wind power combined with water electrolysis to produce hydrogen and compressed energy storage according to claim 3 is characterized by: A first heat exchanger (6) is provided at the cylinder head (710) of the air compressor (7). The first heat exchanger (6) is connected to a heat storage tank (11). The heat storage tank (11) is connected to a second heat exchanger (13). The second heat exchanger (13) is provided on an expander (14) and is used to heat compressed air.

5. The system of wind power combined with water electrolysis to produce hydrogen and compressed energy storage according to any one of claims 1, 2 and 4, characterized in that: A second clutch (3) is also provided between the transmission (2) and the wind turbine generator (4).

6. The system of wind power combined with water electrolysis to produce hydrogen and compressed energy storage according to claim 5 is characterized by: In the air compressor (7), the first clutch (1) is connected to a vertically arranged crankshaft (708) through a transmission mechanism. A plurality of cylinder heads (710) are evenly distributed along the circumference of the crankshaft (708). The plurality of cylinder heads are located in the same layer or in different layers. The crankshaft (708) is connected to a piston (714) through a plurality of connecting rods (709). The piston (714) is slidably mounted in a cylinder body (715) of a cylinder head (710). An exhaust check valve (712) and an intake check valve (713) are provided at the end of the cylinder body (715).

7. The system of wind power combined with water electrolysis to produce hydrogen and compressed energy storage according to claim 6 is characterized by: The first clutch (1) is arranged upstream of the transmission (2), and comprises a driving disc (702) axially slidably connected to the fan shaft (704), a plurality of spline slide rails (703) are arranged on the outer wall of the fan shaft (704), a corresponding slide groove is arranged on the inner wall of the driving disc (702), and a pushing device (705) for controlling the clutch is also arranged on one side of the driving disc (702), and a friction clutch connection is formed between the driven disc (701) and the driving disc (702) which are rotatably supported; The driven plate (701) is connected to a bevel gear set (707) via a belt mechanism, and the bevel gear set (707) is connected to a crankshaft (708).

8. The system of wind power combined with water electrolysis to produce hydrogen and compressed energy storage according to claim 3 is characterized by: The oxygen storage tank (101) and the hydrogen storage tank (102) are connected to the expander (14) to provide a portion of the hydrogen-oxygen mixed gas, and expand the gas in the combustion chamber of the expander (14); The hydrogen storage tank (102) is also connected to the hydrogen fuel cell (22) to generate electrical energy using hydrogen.

9. A control method for a system combining wind power with water electrolysis to produce hydrogen and compressed energy storage according to any one of claims 2 to 8, characterized in that: The following steps are involved: S1, first working mode: the first clutch (1) is disconnected, the impeller drives the fan generator (4) to rotate via the fan shaft (704) and the transmission (2), and the fan generator (4) generates electricity and transmits it to the power transmission device (12); Second working mode: the first clutch (1) is engaged, the fan generator (4) generates electricity and transmits it 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 water electrolysis device (16) and transmit them to the oxygen storage tank (101) and the hydrogen storage tank (102); The circulation pump (9) of the heat storage tank (11) is started to transport the heat exchange medium to the first heat exchanger (6) for heat exchange, and store the heat in the heat storage tank (11); A third working mode: the first clutch (1) engages the air compressor (7), the second clutch (3) is disconnected, and the fan generator (4) does not operate; The air compressor (7) works to compress the hydrogen and oxygen generated in the water electrolysis device (16) and then respectively send them into the oxygen storage tank (101) and the hydrogen storage tank (102); The circulation pump (9) of the heat storage tank (11) is started to transport the heat exchange medium to the first heat exchanger (6) for heat exchange, and store the heat in the heat storage tank (11); Fourth working mode: connecting the oxygen storage tank (101) and the hydrogen storage tank (102) to the combustion chamber of the expander (14), preparing a hydrogen-oxygen mixed gas and a fuel, heating the gas to expand it as a gas source for the expander, and the air generator (15) generates electricity and transmits it to the power transmission and transformation device (12); Fifth working mode: connecting 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); S2. Switch to different working modes according to instructions.

10. The control method of the system of wind power combined with water electrolysis to produce hydrogen and compressed energy storage according to claim 9 is characterized by: S01, switching to the first working mode according to wind speed; 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, combustible garbage, etc.; A combination of the second working mode and the fourth working mode; or a combination of the second working mode, the fourth working mode and the fifth working mode; S02. Compare the wind power prediction curve in advance with the wind power real-time monitoring curve, formulate energy storage charging and discharging strategies in real time according to the difference between the two, and 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, 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 and releases energy; S03. Compare the real-time monitored power generation and grid load demand, and formulate energy storage charging and discharging strategies in real time according to the difference between the two. When the power consumption is at a low peak, the grid load demand is less than the real-time power generation, and the wind turbine is controlled to switch to the third working mode to compress gas energy storage; when the power consumption is at a peak, the grid load demand is greater than the real-time power generation, and the wind turbine is controlled to switch to the second working mode, the fourth working mode, a combination of the second working mode and the fourth working mode, or a combination of the second working mode, the fourth working mode and the fifth working mode, so that the compressed gas participates in power generation and releases energy.

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