Cooling Method of Superconducting Wind Power Generation System Immersed and Cooled with Liquid Hydrogen

Abstract

The present invention discloses a superconducting wind turbine, a system and an application method thereof using liquid hydrogen immersion cooling. The superconducting wind turbine of the present invention includes a stator unit and a rotor unit. A sealed thermal radiation shielding cylinder is fixedly arranged in the stator unit. The rotor unit is inserted and rotatably arranged in the thermal radiation shielding cylinder. A liquid hydrogen input port and a liquid hydrogen return port for realizing liquid hydrogen circulation are provided on the thermal radiation shielding cylinder. A liquid hydrogen cavity is formed between the interior of the thermal radiation shielding cylinder and the rotor unit. Considering that hydrogen production using electrical energy generated from wind energy will be a solution with extremely low cost, the present invention uses liquid hydrogen as the refrigerant for superconducting materials, which can eliminate the expensive refrigeration system and solve the cooling problem of the superconducting coils of the rotor of an offshore superconducting wind turbine.

Description

Technical Field

[0001] The present invention relates to the technology of offshore superconducting wind power generation, and particularly to a superconducting wind turbine generator using liquid hydrogen immersion cooling, a system thereof and an application method thereof. Background Art

[0002] Direct-drive wind turbine generators have become the main development trend of the world's wind power technology. Since offshore wind power systems are far from land and have high maintenance costs, the gearbox, as the component with the highest failure rate in the wind power system, greatly increases the maintenance cost of the fan system and reduces the service life of the fan. The failure rate of the gearbox also increases exponentially with the increase in the capacity of the fan. As the power level increases, the volume and weight of traditional permanent magnet fans will increase exponentially, which means that the transportation cost and hoisting cost of ultra-large power level traditional fans are extremely high. Due to the super-strong current-carrying capacity of superconducting materials, which is 100 times higher than that of traditional copper wires, the power density of superconducting wind turbine generators is extremely high, and their volume and weight can be reduced to less than half of that of traditional motors.

[0003] Superconducting technology has always been regarded as a very expensive high-tech. Due to cost reasons, superconducting application products including superconducting motors are still far from the goal of marketization. In fact, with the decline in the price of superconducting materials and the improvement of their performance, especially the second-generation high-temperature superconducting materials have been fully domesticated. Superconducting application products, especially high-power superconducting wind turbine generator products, not only have great technical advantages compared with traditional power products, but also their cost advantages have gradually emerged. Summary of the Invention

[0004] The technical problem to be solved by the present invention: In view of the above problems of the prior art, a superconducting wind turbine generator using liquid hydrogen immersion cooling, a system thereof and an application method thereof are provided. Considering that using the electric energy generated by wind energy to produce hydrogen will be a solution with extremely low cost (for far-offshore wind farms, the cost of submarine cables is extremely high, and there are many problems regarding stability and reliability. Producing liquid hydrogen with the electric energy generated by offshore wind power and transporting the liquid hydrogen back to the shore by ship can reduce costs), the present invention uses liquid hydrogen as the refrigerant for superconducting materials, which can eliminate the expensive refrigeration system and solve the cooling problem of the superconducting coil of the rotor of the offshore superconducting wind turbine generator.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] The present invention provides a superconducting wind turbine generator using liquid hydrogen immersion cooling, including a stator unit and a rotor unit. A closed thermal radiation shielding cylinder is fixedly arranged in the stator unit. The rotor unit is inserted and rotatably arranged in the thermal radiation shielding cylinder. A liquid hydrogen input port and a liquid hydrogen return port for realizing liquid hydrogen circulation are arranged on the thermal radiation shielding cylinder. A liquid hydrogen cavity is formed between the interior of the thermal radiation shielding cylinder and the rotor unit.

[0007] Optionally, the rotor unit includes a rotating shaft and a rotor skeleton. The rotor skeleton is sleeved and installed on the rotating shaft by using a heat-insulating material to make a torque conduction cylinder sleeve. A rotor superconducting winding is provided on the outer wall of the rotor skeleton. Seals are provided at the through holes of the rotating shaft passing through both ends of the heat radiation shielding cylinder and the heat radiation shielding cylinder.

[0008] Optionally, the stator unit includes a stator skeleton with an inner cavity. A stator winding is provided on the outer wall of the stator skeleton.

[0009] Optionally, a shielding sleeve is wrapped outside the stator winding.

[0010] Optionally, a first temperature sensor is provided on the rotor skeleton.

[0011] Optionally, a liquid level sensor is provided in the rotor superconducting winding on the rotor skeleton.

[0012] The present invention provides a superconducting wind power generation system using liquid hydrogen immersion cooling, including a liquid hydrogen supply device and at least one of the aforementioned superconducting wind turbines using liquid hydrogen immersion cooling. The liquid hydrogen supply device is respectively connected and communicated with the liquid hydrogen input port and the liquid hydrogen return port of the superconducting wind turbine using liquid hydrogen immersion cooling.

[0013] Optionally, the liquid hydrogen supply device includes a liquid hydrogen storage tank with a refrigerator. The liquid hydrogen storage tank is respectively provided with a return pipe and an output pipe. Valves are provided on both the return pipe and the output pipe. A liquid hydrogen pump is provided on the output pipe. The return pipe is connected and communicated with the liquid hydrogen return port, and the output pipe is connected and communicated with the liquid hydrogen input port.

[0014] Optionally, a second temperature sensor for detecting the temperature of the internally stored liquid hydrogen is provided in the liquid hydrogen storage tank. A hydrogen discharge port is provided at the top of the liquid hydrogen storage tank.

[0015] In addition, the present invention also provides an application method of the superconducting wind power generation system using liquid hydrogen immersion cooling, including the steps of controlling the temperature of the liquid hydrogen in the liquid hydrogen supply device to prevent overheating of the rotor unit and heat exchange and gasification in the liquid hydrogen cavity:

[0016] 1) According to the current fan power P, determine whether there is a corresponding liquid hydrogen temperature in the preset fan power - liquid hydrogen temperature table. If there is a corresponding liquid hydrogen temperature, use this liquid hydrogen temperature as the target temperature to control the actual liquid hydrogen temperature T in the liquid hydrogen supply device, and end; if there is no corresponding liquid hydrogen temperature, jump to the next step;

[0017] 2) Increase the actual liquid hydrogen temperature T by a search step size to obtain , control the temperature of the liquid hydrogen in the liquid hydrogen supply device so that the actual temperature T of the liquid hydrogen becomes the temperature ;

[0018] 3) Measure the rotor temperature after the change of the actual temperature T of the liquid hydrogen , and calculate the change value of the rotor temperature after the change of the actual temperature T of the liquid hydrogen: , where is the rotor temperature after the change of the actual temperature T of the liquid hydrogen, is the rotor temperature before the change of the actual temperature T of the liquid hydrogen;

[0019] 4) According to and the search step to obtain the slope influencing factor : ; where C is a preset constant coefficient;

[0020] 5) Determine the next search step according to , where is the sign function;

[0021] 6) Calculate the difference between the rotor temperature after the change of the actual temperature T of the liquid hydrogen and the preset optimal rotor temperature , and judge whether the temperature difference is greater than the threshold . If it holds, add the actual liquid hydrogen temperature T in the liquid hydrogen supply device and its corresponding current fan power P to the fan power - liquid hydrogen temperature table, and end; otherwise, increase the actual liquid hydrogen temperature T in the liquid hydrogen supply device by the search step to obtain the temperature , then use this temperature as the target temperature to control the actual liquid hydrogen temperature T in the liquid hydrogen supply device, and jump to step 3).

[0022] Compared with the prior art, the present invention mainly has the following advantages: Considering that using the electric energy generated by wind energy to produce hydrogen will be a solution with extremely low cost (for far - sea wind farms, the cost of submarine cables is extremely high, and there are many problems regarding stability and reliability. Producing liquid hydrogen with the electric energy generated by offshore wind power and transporting the liquid hydrogen back to the shore by ship can reduce costs), the present invention uses liquid hydrogen as the refrigerant for superconducting materials, which can eliminate the expensive refrigeration system, solve the cooling problem of the superconducting coils of the rotor of the offshore superconducting wind turbine, and the superconducting wind turbine of the present invention has the advantages of large single - machine power, high power density, small volume, and light weight. Brief Description of the Drawings

[0023] Figure 1This is a structural example of the superconducting wind turbine of the present invention.

[0024] Figure 2 It is Figure 1 the schematic cross-sectional structure diagram of A-A in.

[0025] Figure 3 This is a structural example of the superconducting wind power generation system of the present invention.

[0026] Figure 4 This is a process example of the application method of the superconducting wind power generation system of the present invention.

[0027] Legend label description: 1. Stator unit; 11. Stator skeleton; 12. Stator winding; 13. Wrapped with a shielding sleeve on the outside; 2. Rotor unit; 21. Rotating shaft; 211. Torque conduction cylinder; 22. Rotor skeleton; 23. Rotor superconducting winding; 24. Sealing member; 25. First temperature sensor; 26. Liquid level sensor; 3. Thermal radiation shielding cylinder; 30. Form a liquid hydrogen cavity therebetween; 31. Liquid hydrogen inlet; 32. Liquid hydrogen return port; 4. Liquid hydrogen supply device; 41. With a refrigerator; 42. Liquid hydrogen storage tank; 421. Second temperature sensor; 422. Hydrogen discharge port; 43. Return pipe; 44. Output pipe; 45. Liquid hydrogen pump. Detailed implementation manners

[0028] As Figure 1 and Figure 2 shown, this embodiment provides a superconducting wind turbine cooled by soaking in liquid hydrogen, including a stator unit 1 and a rotor unit 2. A sealed thermal radiation shielding cylinder 3 is fixedly arranged in the stator unit 1. The rotor unit 2 is inserted and rotatably arranged in the thermal radiation shielding cylinder 3. The thermal radiation shielding cylinder 3 is provided with a liquid hydrogen inlet 31 and a liquid hydrogen return port 32 for realizing liquid hydrogen circulation. A liquid hydrogen cavity 30 is formed between the inside of the thermal radiation shielding cylinder 3 and the rotor unit 2.

[0029] As Figure 1 shown, the stator unit 1 includes a stator skeleton 11 with an inner cavity (for installing the rotor unit 2). A stator winding 12 is arranged on the outer wall of the stator skeleton 11. The stator skeleton 11 (stator iron core) is composed of a large number of silicon steel sheets laminated together. Many tooth grooves are formed in the middle of these silicon steel sheets for embedding the stator winding 12. An insulating layer is coated on the silicon steel sheets to keep the silicon steel sheets insulated from each other. The stator winding 12 is wound by copper wires coated with insulating paint, and then embedded in the tooth grooves of the stator skeleton 11 according to a certain rule, and finally fixed with a winding slot wedge. In order to enhance the shielding effect on the stator winding 12, as Figure 1 shown, a shielding sleeve 13 is wrapped on the outside of the stator winding 12 in this embodiment.

[0030] As Figure 1As shown in the figure, the rotor unit 2 includes a rotating shaft 21 and a rotor skeleton 22. The rotor skeleton 22 is sleeved and installed on the rotating shaft 21 by a torque conduction cylinder 211 made of heat-insulating material. A rotor superconducting winding 23 is provided on the outer wall of the rotor skeleton 22. Seals 24 are provided at the through holes where both ends of the rotating shaft 21 penetrate through the heat radiation shielding cylinder 3. The torque conduction cylinder 211 is made of heat-insulating material, which can inhibit heat conduction and has a relatively thin wall thickness. Its function is to provide driving torque to the rotor skeleton 22. In this embodiment, the rotor skeleton 22 is a magnet skeleton, specifically made of brass material. The rotor superconducting winding 23 is designed in a racetrack-shaped stacked form and wound around the rotor skeleton 22. In this embodiment, the rotor superconducting winding 23 is specifically made of yttrium barium copper oxide high-temperature superconducting material. The heat radiation shielding cylinder 3 is fixed in the inner cavity of the stator skeleton 11 and does not rotate with the rotor unit 2. A liquid hydrogen cavity 30 is formed between the inside of the heat radiation shielding cylinder 3 and the rotor unit 2. The seal 24 adopts a dynamic seal structure to prevent liquid hydrogen from leaking.

[0031] As Figure 1 shown in the figure, in this embodiment, a first temperature sensor 25 is provided on the rotor skeleton 22 to detect the temperature of the rotor superconducting winding 23. When an over-temperature fault of the rotor superconducting winding 23 is detected, protection measures should be taken immediately.

[0032] As Figure 1 shown in the figure, in this embodiment, a liquid level sensor 26 is provided in the rotor superconducting winding 23 on the rotor skeleton 22. The liquid level sensor 26 is used to detect the liquid hydrogen level in the liquid hydrogen cavity 30 to ensure that the rotor superconducting winding 23 is completely immersed in the liquid hydrogen in the liquid hydrogen cavity 30.

[0033] The heat radiation shielding cylinder 3 is used to reduce the heat conduction of liquid hydrogen to the outside and improve the cooling efficiency of the rotor superconducting winding 23. The required heat radiation shielding technology can be adopted according to needs, such as using heat-insulating / thermal insulation materials, vacuum layers, etc. Multiple heat radiation shielding technologies can also be further adopted to enhance the heat radiation shielding effect.

[0034] As Figure 3 shown in the figure, this embodiment also provides a superconducting wind power generation system using liquid hydrogen immersion cooling, including a liquid hydrogen supply device 4 and the aforementioned superconducting wind turbine using liquid hydrogen immersion cooling. The liquid hydrogen supply device 4 is respectively connected to the liquid hydrogen input port 31 and the liquid hydrogen return port 32 of the superconducting wind turbine using liquid hydrogen immersion cooling. In the working state, the liquid hydrogen supply device 4 sends liquid hydrogen into the liquid hydrogen cavity 30 of the superconducting wind turbine using liquid hydrogen immersion cooling through the liquid hydrogen input port 31, thereby performing liquid hydrogen immersion cooling on the rotor superconducting winding 23 of the rotor unit 2, and then flowing back to the liquid hydrogen supply device 4 from the liquid hydrogen return port 32 to achieve the recycling of liquid hydrogen.

[0035] See Figure 3, in this embodiment, the liquid hydrogen supply device 4 includes a liquid hydrogen storage tank 42 with a refrigerator 41. The liquid hydrogen storage tank 42 is respectively provided with a return pipe 43 and an output pipe 44. Valves are provided on both the return pipe 43 and the output pipe 44. A liquid hydrogen pump 45 is provided on the output pipe 44. The return pipe 43 is connected to the liquid hydrogen return port 32, and the output pipe 44 is connected to the liquid hydrogen input port 31. On the one hand, the return pipe 43 and the output pipe 44 can be used for maintenance. On the other hand, they can also be used to control the liquid level in the liquid hydrogen cavity 30 of the superconducting wind turbine. If the liquid level is insufficient, the valve opening of the output pipe 44 is increased (the valve opening of the return pipe 43 can be further reduced), and after the liquid level reaches the standard (the rotor superconducting winding 23 is completely immersed in liquid hydrogen), the default valve opening of the output pipe 44 is restored (if the valve opening of the return pipe 43 is reduced, the valve opening of the return pipe 43 needs to be restored) to maintain the balance of liquid hydrogen input and output flow. The valve on the output pipe 44 in the liquid hydrogen storage tank 42, under the action of the liquid hydrogen pump 45, enters the liquid hydrogen cavity 30 of the superconducting wind turbine cooled by using liquid hydrogen through the output pipe 44 for heat exchange, then enters the return pipe 43 from the liquid hydrogen return port 32 by gravity, and returns to the liquid hydrogen storage tank 42 through the valve of the return pipe 43. It is cooled by the refrigerator 41 in the liquid hydrogen storage tank 42, and the above process is recycled to achieve the recycling of liquid hydrogen.

[0036] As Figure 3 shown, in this embodiment, a second temperature sensor 421 for detecting the temperature of the internally stored liquid hydrogen is provided in the liquid hydrogen storage tank 42 to detect the liquid hydrogen temperature in the liquid hydrogen storage tank 42; a hydrogen discharge port 422 is provided at the top of the liquid hydrogen storage tank 42, which can be used for the maintenance of the liquid hydrogen storage tank 42. When the hydrogen content in the storage tank is too high, resulting in excessive pressure (which can be detected by a pressure gauge or a pressure sensor), the excess hydrogen is discharged through the hydrogen discharge port 422. As an alternative embodiment, in this embodiment, the valves on the return pipe 43 and the output pipe 44 and the refrigerator 41 are controlled by the same controller, and this controller is installed on the top of the liquid hydrogen storage tank 42. In addition, the valves on the return pipe 43 and the output pipe 44 and the refrigerator 41 can also be partially or fully controlled by independent controllers, and the required installation positions can also be selected according to needs.

[0037] It should be noted that a liquid hydrogen supply device 4 can supply liquid hydrogen to multiple superconducting wind turbines cooled by using liquid hydrogen. Therefore, the liquid hydrogen supply device 4 and multiple superconducting wind turbines cooled by using liquid hydrogen can also be configured into a superconducting wind power generation system cooled by using liquid hydrogen according to needs.

[0038] As Figure 4As shown, this embodiment also provides an application method of the superconducting wind power generation system using liquid hydrogen immersion cooling, including the steps of controlling the temperature of the liquid hydrogen in the liquid hydrogen supply device 4 to prevent the rotor unit 2 from overheating and gasifying the liquid hydrogen chamber 30 by heat exchange:

[0039] 1) According to the current fan power P, determine whether there is a corresponding liquid hydrogen temperature in the preset fan power-liquid hydrogen temperature table. If there is a corresponding liquid hydrogen temperature, use the liquid hydrogen temperature as the target temperature to control the actual liquid hydrogen temperature T in the liquid hydrogen supply device 4, and end; if there is no corresponding liquid hydrogen temperature, jump to the next step;

[0040] 2) Increase the search step length by one for the actual liquid hydrogen temperature T get , the temperature of the liquid hydrogen in the liquid hydrogen supply device 4 is controlled so that the actual temperature T of the liquid hydrogen becomes the temperature ;

[0041] 3) Measure the rotor temperature after the actual temperature T of liquid hydrogen changes , and calculate the rotor temperature change value after the actual liquid hydrogen temperature T changes: ,in is the rotor temperature after the actual temperature T of liquid hydrogen changes, is the rotor temperature before the actual temperature T of liquid hydrogen changes;

[0042] 4) According to and search step length Obtain the factors affecting the slope : ; Wherein, C is the preset constant coefficient;

[0043] 5) According to Determine the next search step ,in is a symbolic function;

[0044] 6) According to Calculate the rotor temperature after the actual temperature T of liquid hydrogen changes With preset optimal rotor temperature The temperature difference between , determine the temperature difference Greater than threshold Is it true? If so, add the actual liquid hydrogen temperature T in the liquid hydrogen supply device 4 and its corresponding current fan power P to the fan power-liquid hydrogen temperature table, and end; otherwise, increase the search step length by the actual liquid hydrogen temperature T in the liquid hydrogen supply device 4 Get temperature , then at this temperature The actual liquid hydrogen temperature T in the liquid hydrogen supply device 4 is controlled as the target temperature, and the process goes to step 3).

[0045] The above steps 2)-5) implement an improved hill-climbing search algorithm, which automatically finds the optimal temperature of liquid hydrogen by optimizing the hill-climbing search algorithm, adds a storage and output link to the traditional hill-climbing algorithm process, and optimizes the step size to prevent oscillation near the optimal temperature point (optimal rotor temperature ), predicts the results and accumulates experience, can be continuously improved according to different environments, does not require manual debugging, and at the same time uses the superconducting rotor temperature feedback control to automatically perform optimal temperature control on the cooling system without knowing parameters such as motor performance. Through the calculation formula of the slope influence factor K and the calculation formula of the next search step size Δn(i+1), the size of the next search step size is positively correlated with the absolute value of the slope, which speeds up the approach of the superconducting rotor to the optimal temperature point. When the superconducting rotor approaches the optimal rotor temperature , the search step size will become smaller accordingly, avoiding the oscillation of the rotor unit 2 near the optimal rotor temperature . As time goes by, a set of actual liquid hydrogen temperatures T and their corresponding current fan powers P are finally formed and added to the fan power-liquid hydrogen temperature table, covering the liquid hydrogen temperature under the rated power. When it is detected that the fan power belongs to the worksheet, there is no need to perform the hill-climbing algorithm anymore, and the liquid hydrogen temperature in the worksheet is directly used as an instruction to control the refrigerator to achieve the optimal temperature operation of the superconducting rotor.

[0046] In this embodiment, when controlling the actual liquid hydrogen temperature T in the liquid hydrogen supply device 4, the liquid hydrogen temperature in the liquid hydrogen storage tank 42 is detected by the second temperature sensor 421 as the actual liquid hydrogen temperature T. If the deviation between the actual rotor temperature and the optimal rotor temperature exceeds the preset threshold, it is necessary to control the refrigerator 41 to refrigerate until the deviation between the actual rotor temperature and the optimal rotor temperature does not exceed the preset threshold. If the deviation between the actual rotor temperature and the optimal rotor temperature does not exceed the preset threshold, no operation needs to be performed.

[0047] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer-usable program code. The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in the process Figure 1 one process or multiple processes and / or blocks Figure 1 These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the functions specified in the process Figure 1 one process or multiple processes and / or blocks Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in the process Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0048] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A cooling method for a superconducting wind power generation system using liquid hydrogen immersion cooling, characterized in that, The superconducting wind power generation system includes a liquid hydrogen supply device (4) and at least one superconducting wind turbine cooled by soaking in liquid hydrogen. The liquid hydrogen supply device (4) is respectively connected to the liquid hydrogen input port (31) and the liquid hydrogen return port (32) of the superconducting wind turbine cooled by soaking in liquid hydrogen. The cooling method includes the steps of controlling the temperature of the liquid hydrogen in the liquid hydrogen supply device (4) to prevent the rotor unit (2) from overheating and the liquid hydrogen in the liquid hydrogen cavity (30) from heat exchange and gasification: 1) According to the current fan power P, determine whether there is a corresponding liquid hydrogen temperature in the preset fan power - liquid hydrogen temperature table. If there is a corresponding liquid hydrogen temperature, use this liquid hydrogen temperature as the target temperature to control the actual liquid hydrogen temperature T in the liquid hydrogen supply device (4), and end; if there is no corresponding liquid hydrogen temperature, jump to the next step; 2) Increase the actual liquid hydrogen temperature T by a search step Obtain , and perform temperature control on the liquid hydrogen in the liquid hydrogen supply device (4) to make the actual temperature T of the liquid hydrogen become the temperature ; 3) Measure the rotor temperature after the actual temperature T of the liquid hydrogen changes , and calculate the change value of the rotor temperature after the actual temperature T of the liquid hydrogen changes: , where is the rotor temperature after the actual temperature T of the liquid hydrogen changes, is the rotor temperature before the actual temperature T of the liquid hydrogen changes; 4) According to and the search step the slope influencing factor is obtained: where C is a preset constant coefficient; 5) According to determine the search step size for the next time , where is the sign function; 6) According to calculate the rotor temperature after the actual temperature T of liquid hydrogen changes and the preset optimal rotor temperature to obtain the temperature difference , and determine whether the temperature difference is greater than the threshold . If it holds, add the actual liquid hydrogen temperature T in the liquid hydrogen supply device (4) and its corresponding current fan power P to the fan power - liquid hydrogen temperature table, and end; otherwise, increase the actual liquid hydrogen temperature T in the liquid hydrogen supply device (4) by the search step to obtain the temperature , then use this temperature as the target temperature to control the actual liquid hydrogen temperature T in the liquid hydrogen supply device (4), and jump to step 3).

2. The cooling method of the superconducting wind power generation system using liquid hydrogen immersion cooling according to claim 1, characterized in that, The liquid hydrogen supply device (4) includes a liquid hydrogen storage tank (42) with a refrigerator (41). The liquid hydrogen storage tank (42) is respectively provided with a return pipe (43) and an output pipe (44). Valves are provided on both the return pipe (43) and the output pipe (44). A liquid hydrogen pump (45) is provided on the output pipe (44). The return pipe (43) is connected to the liquid hydrogen return port (32), and the output pipe (44) is connected to the liquid hydrogen input port (31).

3. The cooling method of the superconducting wind power generation system using liquid hydrogen immersion cooling according to claim 2, characterized in that, A second temperature sensor (421) for detecting the temperature of the internally stored liquid hydrogen is provided in the liquid hydrogen storage tank (42). A hydrogen discharge port (422) is provided at the top of the liquid hydrogen storage tank (42).

4. The cooling method of the superconducting wind power generation system using liquid hydrogen immersion cooling according to claim 1, characterized in that, The superconducting wind turbine includes a stator unit (1) and a rotor unit (2). A sealed thermal radiation shielding cylinder (3) is fixedly arranged in the stator unit (1). The rotor unit (2) is inserted and rotatably arranged in the thermal radiation shielding cylinder (3). A liquid hydrogen input port (31) and a liquid hydrogen return port (32) for realizing liquid hydrogen circulation are provided on the thermal radiation shielding cylinder (3). A liquid hydrogen cavity (30) is formed between the inside of the thermal radiation shielding cylinder (3) and the rotor unit (2).

5. The cooling method of the superconducting wind power generation system using liquid hydrogen immersion cooling according to claim 4, characterized in that, The rotor unit (2) includes a rotating shaft (21) and a rotor skeleton (22). The rotor skeleton (22) is sleeved and installed on the rotating shaft (21) by using a torque conduction cylinder (211) made of heat-insulating material. A rotor superconducting winding (23) is provided on the outer wall of the rotor skeleton (22). Both ends of the rotating shaft (21) penetrate the thermal radiation shielding cylinder (3), and seals (24) are provided at the through holes of the thermal radiation shielding cylinder (3).

6. The cooling method of the superconducting wind power generation system using liquid hydrogen immersion cooling according to claim 5, characterized in that, The stator unit (1) includes a stator skeleton (11) with an inner cavity. A stator winding (12) is provided on the outer wall of the stator skeleton (11).

7. The cooling method of the superconducting wind power generation system using liquid hydrogen immersion cooling according to claim 6, characterized in that, A shielding sleeve (13) is wrapped outside the stator winding (12).

8. The cooling method of the superconducting wind power generation system using liquid hydrogen immersion cooling according to claim 7, characterized in that, A first temperature sensor (25) is provided on the rotor skeleton (22).

9. The cooling method of the superconducting wind power generation system using liquid hydrogen immersion cooling according to claim 8, characterized in that, A liquid level sensor (26) is provided in the rotor superconducting winding (23) on the rotor skeleton (22).

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