Wind energy and hydrogen energy coupled power supply system

Abstract

The embodiment of the application provides a wind energy and hydrogen energy coupled power supply system, and relates to the technical field of hydrogen energy and wind energy coupled power supply.The wind energy and hydrogen energy coupled power supply system comprises a wind power generation system, a first AC / DC converter, a first DC / DC converter, a second DC / DC converter, a bidirectional DC / AC converter, a fuel cell power generation system, a water electrolysis hydrogen production system, a wind power generation system, a hydrogen storage system, a super capacitor, a pumped storage power system, a reservoir and an energy management system; the system can realize long-period energy storage through cooperation of the pumped storage power and hydrogen energy storage; the pumped storage power and the water electrolysis hydrogen production system and the fuel cell power generation system are controlled in real time, energy sent into the power grid during the day is stable and controllable, the electrolysis hydrogen production system is used to store energy at a low price during the night, long-period controllable power grid energy in the future is ensured, the service life of the fuel cell is prolonged, and nearby consumption of sudden power generation is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen energy and wind energy coupling power supply, in particular to a wind energy and hydrogen energy coupling power supply system. BACKGROUND

[0002] New energy is clean, widely distributed and low in cost, and is an ideal source of future energy supply system; therefore, it is necessary to accelerate the construction of a new type of power system with new energy as the main body. The shift from traditional fossil energy to new energy is the global trend.

[0003] The current mainstream wind power system has a large amount of abandoned wind, and pumped storage can alleviate the problem of abandoned wind to a certain extent. However, large-scale wind power systems require centralized large-scale and large-capacity lithium battery storage, which will bring very big safety hazards. Using hydrogen energy as a long-period energy storage unit will effectively avoid the safety impact of lithium battery large-capacity long-period storage. The non-periodic and sudden power fluctuations of wind power pose a challenge to the response time of hydrogen energy. SUMMARY

[0004] The purpose of the present application includes providing a wind energy and hydrogen energy coupling power supply system, which can realize long-period energy storage through the cooperation of pumped storage and hydrogen energy storage.

[0005] Embodiments of the present application can be implemented as follows:

[0006] The present application provides a wind energy and hydrogen energy coupling power supply system, which comprises a wind power system, a first AC / DC converter, a first DC / DC converter, a second DC / DC converter, a bidirectional DC / AC converter, a fuel cell power generation system, a water electrolysis hydrogen production system, a wind power system, a hydrogen storage system, a super capacitor, a pumped storage system, a water storage tank and an energy management system.

[0007] The power output end of the first AC / DC converter, the power output end of the first DC / DC converter, the power input end of the first DC / DC converter and the super capacitor are connected through a DC bus;

[0008] The power output end of the wind power system is connected with the power input end of the first AC / DC converter, the power output end of the fuel cell power generation system is connected with the power input end of the first DC / DC converter, the water electrolysis hydrogen production system is connected with the output end of the second DC / DC, the power output end of the bidirectional DC / AC converter is connected with the power grid, and the pumped storage system is connected with the power grid through an AC bus;

[0009] The hydrogen input end of the fuel cell power generation system, the hydrogen output end of the water electrolysis hydrogen production system and the hydrogen storage system are connected through a hydrogen pipeline, and the pumped storage power generation system is connected with the water pipeline of the reservoir;

[0010] The communication port of the energy management system, the communication port of the first AC / DC converter, the communication port of the first DC / DC converter, the communication port of the fuel cell power generation system, the communication port of the second DC / DC converter, the communication port of the water electrolysis hydrogen production system, the communication port of the hydrogen storage system, the communication port of the bidirectional DC / AC converter and the pumped storage power generation system are connected through a communication bus.

[0011] In an optional embodiment, the energy management system executes an energy management method, comprising the following steps:

[0012] S1: Set the lower limit H1 cubic meters and the upper limit H2 cubic meters of the hydrogen storage capacity of the hydrogen storage system, the lower limit W1 degree of electricity of the stored water of the reservoir, the upper limit W2 degree of electricity of the pumped storage capacity of the pumped storage power generation system, set the reasonable capacity of the hydrogen storage system as H_ref, and set the set value of the stored water of the reservoir as W3 degree of electricity;

[0013] S2: Obtain the actual power generation of yesterday as W3 degree of electricity, the predicted power generation of yesterday as W4 degree of electricity and the predicted value of today's power generation as W5 degree of electricity from the wind power generation system;

[0014] S3: Obtain the current storage amount of hydrogen as H0 cubic meters from the hydrogen storage system, obtain the pumped storage capacity as W0 degree of electricity from the pumped storage power generation system, and calculate the reference power P1 delivered to the power grid during the day.

[0015] In an optional embodiment, P1=(W5+W4-W3+(H0-H_ref)*K1 / 7) / h, wherein K1 is the conversion of 1 cubic hydrogen into how many degrees of electricity, and h is the time of online during the day.

[0016] In an optional embodiment, the energy management system executes an energy management method, further comprising the following steps:

[0017] S4: Obtain the voltage of the DC bus as V_DC from the first DC / DC converter, and set the reference voltage of the DC bus as V_DC_ref;

[0018] S5: Determine whether it is daytime;

[0019] If it is daytime, proceed to S6: calculate the online target power P2.

[0020] In an optional embodiment, P2 = Kp1 * (V DC - V DC_ref) + Kii ∑ (V DC - V DC_ref), wherein Kp1 is a first proportional coefficient, Kii is a first integral coefficient, and if P2 is less than 0, then P2 = 0.

[0021] In an optional embodiment, the energy management system executes the energy management method, further comprising the following steps:

[0022] S7: Set the bidirectional DC / C converter to operate in the grid-connected mode, and the power set value is P3;

[0023] S8: Set the generator set and the pump turbine set in the pumped storage system to operate in the standby mode;

[0024] S9: Determine whether P4 = P1 - P3 is greater than 0;

[0025] When P4 is greater than 0, go to S10, otherwise go to S11;

[0026] S10: Set the power of the generator set in the pumped storage system to P4, and the power of the pump turbine set to 0;

[0027] S11: Set the power of the generator set in the pumped storage system to 0, and the power of the pump turbine set to P4, and jump to S1.

[0028] In an optional embodiment, in S7, if P3 is less than P2, then P3 = P3 + ΔP, otherwise P3 = P3 - ΔP, wherein ΔP is a set power change slope.

[0029] In an optional embodiment, after S10, the energy management system executes the energy management method, further comprising the following steps:

[0030] S12: Determine whether W0 is less than W1 and H0 is greater than H1;

[0031] When W0 is less than W1 and H0 is greater than H1, jump to S13, otherwise jump to S14;

[0032] S13: Start the fuel cell power generation system, start the first DC / DC converter, start the fuel cell power generation system, the output power of the fuel cell power generation system is the rated power, close the second DC / DC converter, and close the water electrolysis hydrogen production system, and return to S1;

[0033] S14: When W0 is greater than W3, close the fuel cell power generation system, close the first DC / DC converter, and return to S1.

[0034] In an optional embodiment, after S5, the energy management system executes the energy management method, further comprising the following steps:

[0035] If it is not daytime, go to S15;

[0036] S15: determine whether W0 is less than W3 or H0 is less than H_ref;

[0037] When W0 is less than W3 or H0 is less than H_ref, go to S16, otherwise go to S19;

[0038] S16: set the power of the generator set inside the pumped storage energy storage system to 0, and the power of the pumping set to the rated pumping power;

[0039] S17: start the fuel cell power generation system, close the first DC / DC converter, close the fuel cell power generation system, start the second DC / DC converter, start the water electrolysis hydrogen production system, and the power of the water electrolysis hydrogen production system is the rated water electrolysis power;

[0040] S18: calculate the power consumption target power P5, set the bidirectional DC / AC converter to work in the energy consumption mode, the electric energy flows from the power grid to the DC bus, the power setting value is P5, and go to S1;

[0041] S19: start the fuel cell power generation system, close the first DC / DC converter, close the fuel cell power generation system, close the second DC / DC converter, close the water electrolysis hydrogen production system, and close the pumped storage energy storage system, and go to S1.

[0042] In an optional embodiment, P5=Kp2*(V_DC_ref-V_DC)+Ki2∑(V_DC_ref-V_DC), wherein Kp2 is a second proportional coefficient, Ki2 is a second integral coefficient, and if P5 is less than 0, P5=0.

[0043] The wind energy and hydrogen energy coupled power supply system provided by the embodiment of the application has the following beneficial effects:

[0044] 1. The long-period energy storage can be realized through the cooperation of pumped storage energy storage and hydrogen energy storage;

[0045] 2. The pumped storage energy storage and the water electrolysis hydrogen production, and the electric energy distribution of the fuel cell power generation system can be controlled in real time according to the weather prediction wind power generation data and the current wind power generation data, so that the energy sent to the power grid in the daytime is stable and controllable, and the hydrogen production by electrolysis is realized to store energy at the low valley price at night, and the controllable long-period on-grid electric energy in the future is ensured;

[0046] 3. According to the characteristics of fuel cell and pumped storage parameters, the energy output can be controlled in real time, the energy distribution can be optimized, the start-stop times of fuel cell engine and the output fluctuation of electric energy can be reduced, and the service life of fuel cell can be prolonged;

[0047] 4. According to the mutation characteristics of wind power generation system, the wind energy capture can be maximized, and the nearby consumption of sudden increase of power generation can be realized through the energy consumption characteristics of pumped storage;

[0048] 5. The nearby distribution of pumped storage and hydrogen energy storage can be realized through the grid-connected characteristics of pumped storage and hydrogen energy storage;

[0049] 6. The system has simple and reliable composition and high operability. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0051] Figure 1 The composition block diagram of the wind energy and hydrogen energy coupled power supply system provided by the embodiments of the present application is shown in the figure.

[0052] Figure 2 And Figure 3 The flowchart of the energy management method executed by the energy management system is shown in the figure.

[0053] Figure: 100-wind energy and hydrogen energy coupled power supply system; 1-wind power generation system; 2-first AC / DC converter; 3-first DC / DC converter; 4-second DC / DC converter; 5-bidirectional DC / AC converter; 6-fuel cell power generation system; 7-hydrogen production system by electrolysis of water; 8-optical fiber; 9-hydrogen storage system; 10-super capacitor; 11-pumped storage system; 12-water storage tank; 13-energy management system; 14-CAN bus; 200-direct current bus; 300-alternating current bus; 400-power grid. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0055] Therefore, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the application without creative labor fall within the scope of the application.

[0056] It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0057] In the description of the application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is usually placed, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0058] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0059] It should be noted that the features in the embodiments of the application can be combined with each other without conflict.

[0060] Please refer to Figure 1 The embodiment provides a wind energy and hydrogen energy coupling power supply system 100, which comprises a wind power generation system 1, a first AC / DC converter 2, a first DC / DC converter 3, a second DC / DC converter 4, a bidirectional DC / AC converter 5, a fuel cell power generation system 6, a water electrolysis hydrogen production system 7, the wind power generation system 1, a hydrogen storage system 9, a super capacitor 10, a pumped storage power system 11, a reservoir 12 and an energy management system 13.

[0061] Specifically, the power output end of the first AC / DC converter 2, the power output end of the first DC / DC converter 3, the power input end of the first DC / DC converter 3 and the super capacitor 10 are connected through a DC bus 200.

[0062] The power output end of the wind power generation system 1 is connected with the power input end of the first AC / DC converter 2, the power output end of the fuel cell power generation system 6 is connected with the power input end of the first DC / DC converter 3, the water electrolysis hydrogen production system 7 is connected with the output end of the second DC / DC converter, the power output end of the bidirectional DC / AC converter 5 is connected with the power grid 400, and the pumped storage power system 11 is connected with the water storage pool 12 through the AC bus 300 and the power grid 400.

[0063] The hydrogen input end of the fuel cell power generation system 6, the hydrogen output end of the water electrolysis hydrogen production system 7 and the hydrogen storage system 9 are connected through the hydrogen pipeline, and the pumped storage power system 11 is connected with the water pipeline of the water storage pool 12.

[0064] The energy management system 13 is connected with the communication port of the wind power generation system 1, the communication port of the first AC / DC converter 2, the communication port of the first DC / DC converter 3, the communication port of the fuel cell power generation system 6, the communication port of the second DC / DC converter 4, the communication port of the water electrolysis hydrogen production system 7, the communication port of the hydrogen storage system 9 and the communication port of the bidirectional DC / AC converter 5 through the communication bus, which is preferably a CAN bus 14.

[0065] The energy management system 13 is connected with the pumped storage power system 11 through the remote communication line, which is preferably an optical fiber 8.

[0066] Please refer to Figure 2 and Figure 3 , the energy management system 13 executes an energy management method, including the following steps:

[0067] S1: Set the lower limit H1 cubic meters and the upper limit H2 cubic meters of the hydrogen storage capacity of the hydrogen storage system 9, the lower limit W1 degree of electricity of the stored water of the water storage pool 12, the upper limit W2 degree of electricity of the pumped storage capacity of the pumped storage power system 11, set the reasonable capacity of the hydrogen storage system 9 as H_ref, and set the set value of the water storage pool 12 as W3 degree of electricity.

[0068] S2: Obtain the actual power generation of yesterday W3 degree of electricity, the predicted power generation of yesterday W4 degree of electricity and the predicted value of today W5 degree of electricity from the wind power generation system 1.

[0069] S3: Obtain the current storage amount of hydrogen H0 cubic meters from the hydrogen storage system 9, obtain the pumped storage capacity W0 degree of electricity from the pumped storage power system 11, and calculate the reference power P1 delivered to the power grid 400 in the daytime.

[0070] Specifically, P1=(W5+W4-W3+(H0-H_ref)*K1 / 7) / h, wherein K1 is the conversion of 1 cubic hydrogen into how many degrees of electricity, and h is the time of online in the daytime.

[0071] S4: Obtain the voltage of the DC bus 200 from the first DC / DC converter 3 as V DC, and set the reference voltage of the DC bus 200 as V DC_ref.

[0072] S5: Determine whether it is daytime.

[0073] If it is daytime, go to S6, and if it is not daytime, go to S15.

[0074] S6: Calculate the online target power P2.

[0075] Specifically, P2 = Kp1 * (V DC - V DC_ref) + Ki1∑(V DC - V DC_ref), where Kp1 is the first proportional coefficient, Ki1 is the first integral coefficient, and if P2 is less than 0, then P2 = 0.

[0076] S7: Set the bidirectional DC / C converter to work in online mode, with power flowing from the DC bus 200 to the grid 400, and the power setting value as P3.

[0077] Specifically, if P3 is less than P2, then P3 = P3 + ΔP, and otherwise, P3 = P3 - ΔP, where ΔP is the set power change slope.

[0078] S8: Set the generator set and the pumping set inside the pumped storage power system 11 to work in standby mode.

[0079] S9: Determine whether P4 = P1 - P3 is greater than 0.

[0080] When P4 is greater than 0, go to S10, and otherwise, go to S11.

[0081] S10: Set the power of the generator set inside the pumped storage power system 11 as P4, and the power of the pumping set as 0, and jump to S12.

[0082] S11: Set the power of the generator set inside the pumped storage power system 11 as 0, and the power of the pumping set as P4, and jump to S1.

[0083] S12: Determine whether W0 is less than W1 and H0 is greater than H1.

[0084] When W0 is less than W1 and H0 is greater than H1, jump to S13, and otherwise, jump to S14.

[0085] S13: Start the fuel cell power generation system 6, start the first DC / DC converter 3, start the fuel cell power generation system 6, set the output power of the fuel cell power generation system 6 as the rated power, close the second DC / DC converter 4, close the water electrolysis hydrogen production system 7, and return to S1.

[0086] S14: When W0 is greater than W3, the fuel cell power generation system 6 is turned off, the first DC / DC converter 3 is turned off, and the process returns to S1.

[0087] S15: Determine whether W0 is less than W3 or H0 is less than H_ref.

[0088] When W0 is less than W3 or H0 is less than H_ref, jump to S16, otherwise jump to S19.

[0089] S16: Set the power of the generator set inside the pumped storage energy storage system 11 to 0, and the power of the pumped storage unit to the rated pumped storage power.

[0090] S17: Start the fuel cell power generation system 6, turn off the first DC / DC converter 3, turn off the fuel cell power generation system 6, start the second DC / DC converter 4, start the water electrolysis hydrogen production system 7, and the power of the water electrolysis hydrogen production system 7 is the rated water electrolysis power.

[0091] S18: Calculate the power consumption target power P5, set the bidirectional DC / AC converter 5 to work in energy consumption mode, and set the power value to P5, and jump to S1.

[0092] Specifically, P5 = Kp2*(V_DC_ref-V_DC) + Ki2∑(V_DC_ref-V_DC), where Kp2 is the second proportional coefficient, Ki2 is the second integral coefficient, and if P5 is less than 0, then P5 = 0.

[0093] S19: Start the fuel cell power generation system 6, turn off the first DC / DC converter 3, turn off the fuel cell power generation system 6, turn off the second DC / DC converter 4, turn off the water electrolysis hydrogen production system 7, and turn off the pumped storage energy storage system 11, and jump to S1.

[0094] The wind energy and hydrogen energy coupled power supply system 100 provided by the embodiment has the following beneficial effects:

[0095] 1. Long-period energy storage can be achieved through the cooperation of pumped storage energy and hydrogen energy storage;

[0096] 2. The pumped storage energy and the electrolysis of water to produce hydrogen can be controlled in real time according to the weather forecast wind power generation data and the current wind power generation data, and the power distribution of the fuel cell power generation system 6, so that the energy sent to the power grid 400 is stable and controllable during the day, and the electrolysis of water to produce hydrogen is used to store energy at low valley price at night, ensuring controllable long-period power supply to the power grid in the future;

[0097] 3. According to the characteristics of fuel cell and pumped storage parameters, the energy output can be controlled in real time, the energy distribution can be optimized, the start-stop times of fuel cell engine and the output fluctuation of electric energy can be reduced, and the service life of fuel cell can be prolonged;

[0098] 4. According to the mutation characteristics of the wind power generation system 1, the wind energy capture can be maximized, the sudden increase of power generation can be consumed nearby through the energy consumption characteristics of pumped storage, and the sudden increase of power generation can be consumed nearby through the energy consumption characteristics of pumped storage;

[0099] 5. The pumped storage and hydrogen energy storage can be arranged at the nearby distribution site through the grid-connected characteristics of pumped storage and hydrogen energy storage;

[0100] 6. The system has simple and reliable composition and high operability.

[0101] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A wind energy and hydrogen energy coupled power supply system, characterized in that: The wind energy and hydrogen energy coupled power supply system comprises a wind power generation system (1), a first AC / DC converter (2), a first DC / DC converter (3), a second DC / DC converter (4), a bidirectional DC / AC converter (5), a fuel cell power generation system (6), a water electrolysis hydrogen production system (7), a wind power generation system (1), a hydrogen storage system (9), a supercapacitor (10), a pumped water storage system (11), a water reservoir (12) and an energy management system (13); The power output end of the first AC / DC converter (2), the power output end of the first DC / DC converter (3), the power input end of the first DC / DC converter (3), and the supercapacitor (10) are connected via a DC bus (200); The power output end of the wind power generation system (1) is connected to the power input end of the first AC / DC converter (2), the power output end of the fuel cell power generation system (6) is connected to the power input end of the first DC / DC converter (3), the water electrolysis hydrogen production system (7) is connected to the output end of the second DC / DC, the power output end of the bidirectional DC / AC converter (5) is connected to the power grid (400), and the pumped water storage system (11) is connected to the power grid (400) via an AC bus (300); The hydrogen input end of the fuel cell power generation system (6), the hydrogen output end of the water electrolysis hydrogen production system (7) and the hydrogen storage system (9) are connected via a hydrogen pipeline, and the pumped water storage system (11) is connected to the water pipeline of the water reservoir (12); The energy management system (13) is connected to the communication port of the wind power generation system (1), the communication port of the first AC / DC converter (2), the communication port of the first DC / DC converter (3), the communication port of the fuel cell power generation system (6), the communication port of the second DC / DC converter (4), the communication port of the water electrolysis hydrogen production system (7), the communication port of the hydrogen storage system (9), the communication port of the bidirectional DC / AC converter (5), and the pumped water energy storage system (11) via a communication bus; The energy management system (13) executes an energy management method, comprising the following steps: S1: Set the lower limit H1 cubic meter and the upper limit H2 cubic meter of the hydrogen storage capacity of the hydrogen storage system (9), the lower limit W1 kWh of water storage in the water reservoir (12), the upper limit W2 kWh of pumped energy storage in the pumped energy storage system (11), the reasonable capacity of hydrogen storage in the hydrogen storage system (9) to H_ref, and the set value of water storage in the water reservoir (12) to W3 kWh; S2: obtaining from the wind power generation system (1) yesterday's actual power generation of W3 kWh, yesterday's predicted power generation of W4 kWh, and today's predicted power generation of W5 kWh; S3: The current storage capacity of hydrogen obtained from the hydrogen storage system (9) is H0 cubic meters, and the pumped energy storage capacity obtained from the pumped energy storage system (11) is W0 kWh. The reference power P1 transmitted to the power grid (400) during the day is calculated, P1 = (W5 + W4 - W3 + (H0 - H_ref) * K1 / 7) / h, where K1 is the number of kWh converted from 1 cubic meter of hydrogen, and h is the time of Internet access during the day. S4: obtaining the voltage of the DC bus (200) as V_DC from the first DC / DC converter (3), and setting the reference voltage of the DC bus (200) as V_DC_ref; S5: Determine whether it is daytime; If it is daytime, then enter S6: calculate the target Internet access power P2, P2 = Kp1*(V_DC-V_DC_ref)+Ki1∑(V_DC-V_DC_ref), where Kp1 is the first proportional coefficient and Ki1 is the first integral coefficient. If P2 is less than 0, then P2 = 0; S7: Setting the bidirectional DC / C converter to operate in an on-grid mode, so that electric energy flows from the DC bus (200) into the grid (400), and the power setting value is P3; S8: setting the generator set and the pumping unit inside the pumped energy storage system (11) to operate in a standby mode; S9: Determine whether P4=P1-P3 is greater than 0; When P4 is greater than 0, it enters S10, otherwise, it enters S11; S10: setting the power of the generator set inside the pumped energy storage system (11) to P4 and the power of the pumping unit to 0; S11: Set the power of the generator set inside the pumped energy storage system (11) to 0, the power of the pumping unit to P4, and jump to S1.

2. The wind energy and hydrogen energy coupled power supply system according to claim 1, characterized in that: In S7, if P3 is less than P2, then P3=P3+ΔP, otherwise, then P3=P3-ΔP, where ΔP is the set power change slope.

3. The wind energy and hydrogen energy coupled power supply system according to claim 1, characterized in that: After S10, the energy management system (13) executes the energy management method, further comprising the following steps: S12: Determine whether W0 is less than W1 and H0 is greater than H1; When W0 is less than W1 and H0 is greater than H1, jump to S13, otherwise jump to S14; S13: Start the fuel cell power generation system (6), start the first DC / DC converter (3), start the fuel cell power generation system (6), the output power of the fuel cell power generation system (6) is the rated power, close the second DC / DC converter (4), close the water electrolysis hydrogen production system (7), and return to S1; S14: When W0 is greater than W3, the fuel cell power generation system (6) is turned off, the first DC / DC converter (3) is turned off, and the process returns to S1.

4. The wind energy and hydrogen energy coupled power supply system according to claim 1, characterized in that: After S5, the energy management system (13) executes the energy management method, further comprising the following steps: If it is not daytime, go to S15; S15: Determine whether W0 is less than W3 or H0 is less than H_ref; When W0 is less than W3 or H0 is less than H_ref, jump to S16, otherwise jump to S19; S16: setting the power of the generator set inside the pumped energy storage system (11) to 0 and the power of the pumping unit to the rated pumping power; S17: starting the fuel cell power generation system (6), closing the first DC / DC converter (3), closing the fuel cell power generation system (6), starting the second DC / DC converter (4), and starting the water electrolysis hydrogen production system (7), wherein the power of the water electrolysis hydrogen production system (7) is the rated water electrolysis power; S18: Calculate the target power P5 of electric energy consumption, set the bidirectional DC / AC converter (5) to operate in the energy consumption mode, and set electric energy from the power grid (400) to flow into the DC bus (200). The power setting value is P5, and the process proceeds to S1; S19: Start the fuel cell power generation system (6), turn off the first DC / DC converter (3), turn off the fuel cell power generation system (6), turn off the second DC / DC converter (4), turn off the water electrolysis hydrogen production system (7), turn off the pumped water storage system (11), and jump to S1.

5. The wind energy and hydrogen energy coupled power supply system according to claim 4, characterized in that: P5=Kp2*(V_DC_ref-V_DC)+Ki2∑(V_DC_ref-V_DC), where Kp2 is the second proportional coefficient, Ki2 is the second integral coefficient, and if P5 is less than 0, then P5=0.

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