Water electrolysis system oriented to wind, storage and hydrogen and control method

Abstract

The invention relates to a wind-storage-hydrogen-oriented water electrolysis system and a control method, and the system comprises a power generation module, a control module, a power grid load power module and a hydrogen energy storage module. The control module is used for controlling the hydrogen energy storage module to adjust the hydrogen production efficiency according to the abnormal power and the range of the current hydrogen storage capacity or according to the abnormal power, the range of the current hydrogen storage capacity and the comparison result; the control method is used for controlling the process. According to the invention, the abnormal power is calculated and the comparison result is obtained through the wind power generation power and the power grid load power, the working conditions of the fuel cell unit and the electrolytic cell unit are controlled and can be mutually converted in combination with the current hydrogen storage capacity range, the dynamic balance is kept, and the stable power supply is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of water electrolysis, and in particular to a wind-storage-hydrogen oriented water electrolysis system and a control method. Background Art

[0002] PEM electrolysis, as the core of the new energy water electrolysis hydrogen production system, is a technology that uses water electrolysis to generate pure hydrogen. It has the characteristics of fast dynamic response speed, large current density, and wide adjustment range, and is more suitable for fluctuating new energy hydrogen production scenarios. However, the voltage level of new energy power generation is high, the power volatility is strong, the working voltage level of PEM electrolysis is low, and the volt-ampere characteristic is nonlinear. The wind-storage-hydrogen system is a hydrogen production application scenario. In order to cope with the power volatility of large-scale wind power generation, it is necessary to optimize the control strategy of the energy storage system in the wind power generation hydrogen production system.

[0003] The invention patent with publication number CN116169718A discloses a control method for a wind power on-site hydrogen production system for a PEM electrolyzer load, including a single permanent magnet direct-drive wind turbine set, a PEM electrolyzer, an energy storage battery and other equipment. It takes the safe and stable hydrogen production of the electrolyzer as a prerequisite, fully taps the power regulation capability of the wind turbine itself, proposes a system operation mode based on the capacity of the PEM electrolyzer, and formulates an operation control strategy for each device in conjunction with the regulation function of the energy storage battery. The patent takes hydrogen production as the primary purpose, fully utilizes the electricity generated by the wind turbine, and only uses energy storage batteries to balance power changes. The fault tolerance rate is not high, and the process of hydrogen production and hydrogen power generation cannot be accurately controlled.

[0004] Therefore, providing a control method with high fault tolerance and accurate control of the hydrogen production process is an issue that needs to be addressed urgently. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a wind-storage-hydrogen oriented water electrolysis system and control method.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to one aspect of the present invention, there is provided a wind-storage-hydrogen oriented water electrolysis system, comprising a power generation module, a control module and a grid load power, the system further comprising a hydrogen energy storage module, the control module being communicatively connected to the power generation module and the hydrogen energy storage module respectively, the hydrogen energy storage module comprising an electrolyzer unit, a hydrogen storage unit and a fuel cell unit connected in sequence, the hydrogen storage unit comprising a hydrogen storage tank, the power generation module collecting wind power generation power, the hydrogen energy storage module collecting the rated power of the fuel cell unit and the current hydrogen storage capacity of the hydrogen storage tank;

[0008] The control module calculates the abnormal power through the wind power generation power and the grid load power, and compares the abnormal power with the rated power of the fuel cell unit to obtain a comparison result. The control module controls the hydrogen energy storage module to adjust the efficiency of hydrogen production according to the abnormal power and the range of the current hydrogen storage amount, or according to the abnormal power, the range of the current hydrogen storage amount and the comparison result.

[0009] As a preferred technical solution, the system further comprises an electrochemical energy storage module, and the electrochemical energy storage module is communicatively connected to the control module.

[0010] As a preferred technical solution, the system further comprises a PCS unit, and the PCS unit is respectively connected to the power generation module, the electrochemical energy storage module and the hydrogen energy storage module.

[0011] According to another aspect of the present invention, there is provided a control method for a water electrolysis system for wind-storage-hydrogen as described above, characterized in that the method comprises the following steps:

[0012] S1, the control module determines whether the current system is in abnormal power and whether the current hydrogen storage capacity is within a preset range, and obtains a comparison result;

[0013] S11, if it is in abnormal power and the current hydrogen storage capacity is within the preset range, adjusting the operating conditions of the electrolyzer unit and the fuel cell unit;

[0014] S12: If the power is abnormal and the current hydrogen storage capacity is within a preset range, the operating conditions of the electrolyzer unit and the fuel cell unit are adjusted according to the comparison result.

[0015] As a preferred technical solution, the preset ranges are sequentially set to include a first preset range, a second preset range, a third preset range and a fourth predicted range according to the capacity of the hydrogen storage tank.

[0016] As a preferred technical solution, the abnormal power includes surplus power and shortfall power, the surplus power is wind power generation power minus grid load power, and the shortfall power is grid load power minus wind power generation power.

[0017] As a preferred technical solution, the step S11 specifically includes the following steps:

[0018] S111, if there is surplus power and the current hydrogen storage amount is within a first preset range, the electrolyzer unit operates at reduced power and the fuel cell unit operates at rated power;

[0019] S112, if it is surplus power and the current hydrogen storage capacity is within the second preset range, the electrolyzer unit and the fuel cell unit are both operated at rated power;

[0020] S113, if it is the shortfall power, and the current hydrogen storage capacity is within the second preset range, the electrolyzer unit and the fuel cell unit are both operated at the rated power;

[0021] S114: If it is a power shortage and the current hydrogen storage capacity is within a fourth preset range, both the electrolyzer unit and the fuel cell unit are shut down.

[0022] As a preferred technical solution, the step S12 specifically includes the following steps:

[0023] S121. If it is a power deficit, the current hydrogen storage capacity is within a first preset range and the power deficit is greater than the rated power of the fuel cell unit, the electrolyzer unit operates at reduced power and the fuel cell unit operates at rated power.

[0024] As a preferred technical solution, the step S12 further specifically includes the following steps:

[0025] S122: If it is a power deficit, the current hydrogen storage capacity is within a first preset range and the power deficit is less than the rated power of the fuel cell unit, the electrolyzer unit operates at reduced power and the fuel cell unit operates at rated power.

[0026] As a preferred technical solution, the step S12 further specifically includes the following steps:

[0027] S123, if it is surplus power, the current hydrogen storage capacity is within the third preset range and the surplus power is greater than the electrolyzer power which is the rated power, the electrolyzer unit is operated at the rated power and the fuel cell unit is shut down;

[0028] S124: If it is surplus power, the current hydrogen storage amount is in a third preset range and the surplus power is less than the electrolyzer power which is the rated power, the electrolyzer unit is operated at the rated power and the fuel cell unit is shut down.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention calculates abnormal power and obtains comparison results through wind power generation power and grid load power, and combines it with the current hydrogen storage range to control the working conditions of the fuel cell unit and the electrolyzer unit and convert them to each other, maintain dynamic balance, and achieve stable power supply.

[0031] 2. The present invention can perform different controls according to different situations by setting up a control module, thereby improving the hydrogen production efficiency. By optimizing the control method of the electrolyzer unit and the fuel cell unit, it can reduce energy loss, avoid insufficient hydrogen production due to power fluctuations, and stably produce hydrogen.

[0032] 3. The present invention provides a hydrogen storage tank and maintains the hydrogen in the hydrogen tank within a reasonable range according to a corresponding control method, so that the hydrogen can be converted into electricity conveniently and timely.

[0033] 4. The control method adopted in the present invention can extend the life of the equipment, and can cope with emergencies, so that the hydrogen storage tank is in a stable working state, and enhance the overall risk resistance of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall connection of the system of the present invention;

[0035] Figure 2 It is a schematic flow chart of the control method of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0037] Hydrogen energy is a secondary energy source with high energy density, high conversion efficiency, clean and pollution-free. It is widely used in aerospace, electricity, transportation, chemical industry, metallurgy and other fields. According to the carbon emissions in the hydrogen production process, hydrogen energy can be divided into gray hydrogen, blue hydrogen and green hydrogen. Among them, gray hydrogen is produced by burning fossil fuels such as coal, and its carbon emission intensity is the highest. Blue hydrogen is based on gray hydrogen and uses carbon capture, carbon sequestration and other technologies to achieve low-carbon hydrogen production. Green hydrogen is produced by electrolyzing water using new energy power generation, and carbon emissions are zero during the hydrogen production process.

[0038] The new energy water electrolysis hydrogen production can not only realize the on-site development and consumption of fluctuating new energy and improve energy utilization, but also realize the full green production of hydrogen, fundamentally changing the hydrogen production architecture. However, electric hydrogen production can only consume and utilize wind and solar resources that cannot be connected to the grid, but it cannot solve the problem of the power grid's inability to cope with frequency fluctuations under the "double high" characteristics, and cannot increase the proportion of renewable energy connected to the grid. Since the efficiency of power generation is often better than the efficiency of hydrogen production, how to improve the ability of the "double high" characteristic power grid system to cope with frequency fluctuations under the dual carbon goals is of great economic and practical significance.

[0039] As the core of the new energy water electrolysis hydrogen production system, PEM electrolysis has the characteristics of fast dynamic response speed, high current density, and wide adjustment range, and is more suitable for fluctuating new energy hydrogen production scenarios. However, the voltage level of new energy power generation is high, the power volatility is strong, the working voltage level of PEM electrolysis is low, and the volt-ampere characteristic is nonlinear. The wind-storage-hydrogen system is a hydrogen production application scenario. In order to cope with the power volatility of large-scale wind power generation, it is necessary to optimize the control strategy of the energy storage system in the wind power generation hydrogen production system.

[0040] The present invention provides a water electrolysis system and control method for wind-storage-hydrogen. The present invention calculates abnormal power and obtains comparison results through wind power generation power and grid load power, and controls the working conditions of fuel cell units and electrolyzer units in combination with the current hydrogen storage range, and can convert each other to maintain dynamic balance and achieve stable power supply. The present invention can improve hydrogen production efficiency by setting a control module, and can reduce energy loss and avoid insufficient hydrogen production due to power fluctuations by optimizing the control method of electrolyzer units and fuel cell units, so as to stably produce hydrogen. The present invention can conveniently and timely convert hydrogen into electricity by setting a hydrogen storage tank and keeping the hydrogen in the hydrogen tank within a reasonable range according to the corresponding control method. The control method adopted by the present invention can extend the life of the equipment, and can cope with emergencies, so that the hydrogen storage tank is in a stable working state and enhance the overall risk resistance of the system.

[0041] Example 1

[0042] A wind-storage-hydrogen oriented water electrolysis system, comprising a power generation module, a control module and grid load power, the system further comprising a hydrogen energy storage module, the control module is respectively connected to the power generation module and the hydrogen energy storage module in communication, the hydrogen energy storage module comprises an electrolyzer unit, a hydrogen storage unit and a fuel cell unit connected in sequence, the hydrogen storage unit comprises a hydrogen storage tank, the power generation module collects wind power generation power, the hydrogen energy storage module collects the rated power of the fuel cell unit and the current hydrogen storage capacity of the hydrogen storage tank;

[0043] The control module calculates the abnormal power through the wind power generation power and the grid load power, and compares the abnormal power with the rated power of the fuel cell unit to obtain a comparison result. The control module controls the hydrogen energy storage module to adjust the efficiency of hydrogen production according to the abnormal power and the range of the current hydrogen storage amount, or according to the abnormal power, the range of the current hydrogen storage amount and the comparison result.

[0044] The system also includes an electrochemical energy storage module, which is communicatively connected to the control module.

[0045] The system also includes a PCS unit, which is connected to the power generation module, the electrochemical energy storage module and the hydrogen energy storage module respectively.

[0046] In this embodiment, if Figure 1 As shown, the main modules of the system are a wind power generation module, an electrochemical energy storage module (the electrochemical energy storage modules involved in the present invention all use lithium batteries), and a hydrogen energy storage module. The hydrogen energy storage module includes an electrolyzer unit, a fuel cell unit, and a hydrogen storage unit. The electrolyzer unit is a PEM electrolyzer unit, the fuel cell unit is a hydrogen fuel cell unit, and the hydrogen storage unit includes a hydrogen storage tank. These modules adopt a common DC bus architecture. The wind power generation module supplies energy to the DC bus through an AC-DC converter, and the electrochemical energy storage module determines the execution of the charging or discharging function according to the power conditions of each module. The electrolyzer unit in the hydrogen energy storage module is powered by the DC bus to perform water electrolysis to produce hydrogen. The hydrogen produced by electrolysis first enters the hydrogen storage unit and then supplies the fuel cell unit. The fuel cell unit also supplies energy to the DC load through the DC bus.

[0047] After these modules are connected to the DC bus, they are also connected to the AC bus through the PCS unit (PCS: Power Conversion System, which can control the charging and discharging process of the battery, perform AC-DC conversion, and directly supply power to the AC load without a power grid). The power grid transmits power and grid signals to the AC bus, and the power is supplied to the AC load. The grid signal is also connected to the control module for subsequent control strategy formulation.

[0048] The important factors that affect the working conditions of the wind-storage-hydrogen system include the power of the electrolyzer unit, the capacity of the hydrogen storage tank, the power of wind power generation, the power of the grid load, the battery power of the electrochemical energy storage module, and the power of the fuel cell unit. The power of wind power generation fluctuates greatly, which directly affects the operating efficiency of the electrolyzer unit. The power of the electrolyzer unit affects the hydrogen generation rate. When the wind power generation is sufficient, the higher the power of the electrolyzer unit, the more it can convert the excess electric energy into hydrogen energy. However, when the wind power generation is insufficient, the excessive power of the electrolyzer unit may cause energy waste. If the capacity of the hydrogen storage tank is sufficient, it can store excess hydrogen energy when the load demand for electricity is low. However, if the capacity is insufficient, it will bring safety risks to the system as a whole, and the risk will be greater in unstable new energy power generation systems. Changes in the grid load affect the regulation ability of the system. When the grid load is high, the electrolyzer unit needs to reduce the hydrogen production power to ensure that the wind power generation supplies the grid load. When the grid load is low, the electrolyzer unit can increase the power to ensure that the excess electric energy is converted into hydrogen energy. The power of the fuel cell unit affects the efficiency of converting hydrogen energy into electrical energy, while the electrochemical energy storage module mainly plays a coordinating and controlling role in the system, maintaining the overall stability of the system and balancing the power supply and demand between different modules. The control module is usually located in the wind farm booster station, communicating with each module and issuing instructions to the control system of each module.

[0049] Example 2

[0050] 1. Compare the power of the electrolyzer with the power of wind power generation; if the power of the two is almost equal, the system is operating efficiently; if the power of the electrolyzer unit is lower than the power of wind power generation, the system may be in a state of excess power, and the power of hydrogen production and storage can be increased, or the electrochemical energy storage system can be charged; if the power of the electrolyzer unit is higher than the power of wind power generation, it may lead to insufficient power, and the battery status of the electrochemical energy storage module needs to be checked.

[0051] 2. Check the capacity of the hydrogen storage tank. Regularly check the pressure and liquid level of the hydrogen storage tank to determine whether the storage is sufficient; if the hydrogen storage tank is close to full, it means that there is excess power and the electrolyzer output needs to be reduced; if the hydrogen storage tank capacity is insufficient, it means that the hydrogen energy is consumed too quickly and the electrolyzer operating power needs to be increased.

[0052] 3. Compare the power of the grid load and the power of the hydrogen fuel cell. The system needs to ensure that the power of the fuel cell unit can meet the grid demand. If the grid load is high, it may be necessary to supplement the power from the battery of the electrochemical energy storage module; if the power of the fuel cell unit is high, it is necessary to charge the energy storage.

[0053] 4. Observe the charging and discharging status of the electrochemical energy storage module to see whether it can effectively balance the operation of the wind power generation module and the electrolyzer unit. When wind energy is insufficient, it is necessary to replenish electricity in the hydrogen energy storage module in time to avoid shutdown of the electrolyzer unit.

[0054] 5. Calculate the energy conversion efficiency of each link of the hydrogen energy storage module (electrolyzer unit, hydrogen energy content, fuel cell unit), and judge the overall performance of the system, including the following calculation process:

[0055] (1) Electrolytic cell power P e The calculation method is as follows:

[0056]

[0057] In the formula, R I It is the equivalent internal resistance of the electrolytic cell, which is the combination of the internal resistance of the electrolytic cell and the electrolyte resistance connected in parallel with it;

[0058] R L is the leakage resistance, which is the resistance value of the membrane separating the cathode chamber and the anode chamber inside the electrolytic cell;

[0059] E is the minimum voltage required for the water decomposition reaction;

[0060] V con It is the concentration overpotential, which refers to the overpotential caused by the concentration difference of the electrolyte during the electrolysis process;

[0061] V actis the activation overpotential, which refers to the additional energy that needs to be overcome in the electrochemical reaction;

[0062] V ohm is the Ohmic overpotential, which refers to the change in potential on the electrode surface as the current density increases;

[0063] I e is the current of the electrolytic cell;

[0064] V e is the voltage of the electrolyzer.

[0065] (2) The power and efficiency calculation method of the fuel cell unit is as follows:

[0066] Output power of fuel cell unit: The output power of fuel cell is one of the main factors affecting hydrogen consumption. The higher the power output, the higher the hydrogen consumption of fuel cell. Output power = output current * output voltage.

[0067] The efficiency of a fuel cell unit refers to the ratio of input fuel energy converted into output electrical energy. Efficiency = output electrical energy / input fuel amount.

[0068] Hydrogen energy content: refers to the energy of hydrogen per unit mass. Energy content = hydrogen fuel mass * hydrogen fuel calorific value.

[0069] The calculation formula of hydrogen consumption of fuel cell unit is: Hydrogen consumption = power / (efficiency*energy content). In practical applications, each parameter needs to be accurately measured and monitored to ensure the accuracy of the calculation results.

[0070] like Figure 2 As shown, a control method for a wind-storage-hydrogen electrolysis system, the method comprising the following steps:

[0071] S1, the control module determines whether the current system is in abnormal power and whether the current hydrogen storage capacity is within a preset range, and obtains a comparison result;

[0072] S11, if it is in abnormal power and the current hydrogen storage capacity is within the preset range, adjusting the operating conditions of the electrolyzer unit and the fuel cell unit;

[0073] S12: If the power is abnormal and the current hydrogen storage capacity is within a preset range, the operating conditions of the electrolyzer unit and the fuel cell unit are adjusted according to the comparison result.

[0074] The preset ranges are sequentially set to include a first preset range, a second preset range, a third preset range and a fourth predicted range according to the capacity of the hydrogen storage tank.

[0075] The abnormal power includes surplus power and shortfall power, wherein the surplus power is wind power generation power minus grid load power, and the shortfall power is grid load power minus wind power generation power.

[0076] In this embodiment, if the wind power generation power is greater than the grid load power, it means that there is excess power, and the remaining power is wind power generation power-grid load power; if the wind power generation power is less than the grid load power, it means that there is a power gap, and the gap power is grid load power-wind power generation power. Different preset ranges are divided according to the capacity of the hydrogen storage tank. The range greater than the upper limit of the hydrogen storage tank capacity is the first preset range; the range of the normal value of the hydrogen storage tank capacity is the second preset range; the range between the normal value and the lower limit of the hydrogen storage tank capacity is the third preset range; the range below the lower limit of the hydrogen storage tank capacity is the fourth preset range.

[0077] The step S11 specifically includes the following steps:

[0078] S111. If there is surplus power and the current hydrogen storage capacity is within the first preset range, the electrolyzer unit operates at reduced power and the fuel cell unit operates at rated power; if the system power is in excess and the current hydrogen storage capacity is in excess, the electrolyzer unit keeps operating at reduced power. In order to utilize the excess power while maintaining the normal capacity of the hydrogen storage tank, the electrochemical energy storage module starts to work and consumes power. The power consumed is the DC side load power + the rated power of the fuel cell. The fuel cell unit consumes hydrogen when operating at rated power.

[0079] S112. If it is surplus power and the current hydrogen storage capacity is within the second preset range, the electrolyzer unit and the fuel cell unit both operate at rated power; if the system has excess power and the hydrogen storage tank capacity is normal, the electrolyzer unit maintains normal operation. In order to utilize the excess power while maintaining the normal capacity of the hydrogen storage tank and the normal operation of the electrolyzer unit, the electrochemical energy storage module starts to work and consumes power. The power consumed is the DC side load power + the fuel cell rated power - the electrolyzer rated power, and the fuel cell unit operates normally.

[0080] S113. If it is a power shortfall and the current hydrogen storage capacity is within the second preset range, the electrolyzer unit and the fuel cell unit both operate at rated power; if there is a power shortfall in the system, the hydrogen storage tank capacity is normal, the electrolyzer unit operates at rated power to ensure the normal capacity of the hydrogen storage tank, the electrochemical energy storage module starts to work to balance the system power, and the fuel cell unit operates at rated power. The power of the electrochemical energy storage module is the DC side power + the electrolyzer rated power - the fuel cell rated power.

[0081] S114: If the power is short, and the current hydrogen storage capacity is within the fourth preset range, both the electrolyzer unit and the fuel cell unit will shut down. If there is a power shortfall in the system, the hydrogen storage tank capacity is lower than the lower capacity limit, the electrolyzer unit will start to work to ensure the normal capacity of the hydrogen storage tank, the electrochemical energy storage module will start to work to balance the system power, and the fuel cell unit will shut down. The energy storage system power is the DC side power + the electrolyzer rated power

[0082] The step S12 specifically includes the following steps:

[0083] S121. If it is a power deficit, the current hydrogen storage capacity is within the first preset range and the power deficit is greater than the rated power of the fuel cell unit, the electrolyzer unit operates at reduced power and the fuel cell unit operates at rated power. If there is a power deficit in the system, and the hydrogen storage tank capacity exceeds the upper capacity limit, if at this time and the power deficit is greater than the rated power of the fuel cell unit, the electrolyzer unit operates at reduced power. In order to ensure system stability and normal hydrogen storage tank capacity, the electrochemical energy storage module starts to work to balance the system power, and the fuel cell unit consumes hydrogen at rated power, where the energy storage system power is the DC side power minus the fuel cell rated power.

[0084] The step S12 further specifically includes the following steps:

[0085] S122: If it is a power shortfall, the current hydrogen storage capacity is within the first preset range and the power shortfall is less than the rated power of the fuel cell unit, the electrolyzer unit operates at reduced power and the fuel cell unit operates at rated power. If there is a power shortfall in the system, the hydrogen storage tank capacity exceeds the upper capacity limit, the electrolyzer unit operates at reduced power, and in order to ensure system stability and normal hydrogen storage tank capacity, the electrochemical energy storage module starts to work and consumes system power, and the fuel cell unit operates at rated power and consumes hydrogen, where the energy storage system power is the fuel cell rated power minus the DC side power.

[0086] The step S12 further specifically includes the following steps:

[0087] S123. If it is surplus power, the current hydrogen storage capacity is within the third preset range and the surplus power is greater than the electrolyzer power which is the rated power, then the electrolyzer unit operates at the rated power and the fuel cell unit shuts down; if the system has excess power, the hydrogen storage tank capacity is low and the pressure is insufficient, the electrolyzer unit needs to continue to work normally to produce hydrogen, in order to utilize the excess power and increase the hydrogen storage tank capacity to normal, the electrochemical energy storage module starts to charge and consumes excess electrical energy, the power of the electrochemical energy storage module is the DC side load power - the electrolyzer rated power, and the fuel cell unit shuts down.

[0088] S124: If it is surplus power, the current hydrogen storage capacity is within the third preset range and the surplus power is less than the electrolyzer power which is the rated power, the electrolyzer unit operates at the rated power and the fuel cell unit shuts down. The system has excess power, the hydrogen storage tank has a low capacity and insufficient pressure, and the electrolyzer unit operates at the rated power to produce hydrogen. In order to utilize the excess power and increase the hydrogen storage tank capacity at the same time, the electrochemical energy storage module starts to work to consume the excess power, and the fuel cell shuts down, where the energy storage system power is the electrolyzer rated power minus the DC side load power.

[0089] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A water electrolysis system for wind-storage-hydrogen, comprising a power generation module, a control module and a grid load power, characterized in that: The system further comprises a hydrogen energy storage module, wherein the control module is respectively in communication with the power generation module and the hydrogen energy storage module, wherein the hydrogen energy storage module comprises an electrolyzer unit, a hydrogen storage unit and a fuel cell unit which are connected in sequence, wherein the hydrogen storage unit comprises a hydrogen storage tank, the power generation module collects wind power generation power, and the hydrogen energy storage module collects the rated power of the fuel cell unit and the current hydrogen storage capacity of the hydrogen storage tank; The control module calculates the abnormal power through the wind power generation power and the grid load power, and compares the abnormal power with the rated power of the fuel cell unit to obtain a comparison result. The control module controls the hydrogen energy storage module to adjust the efficiency of hydrogen production according to the abnormal power and the range of the current hydrogen storage amount, or according to the abnormal power, the range of the current hydrogen storage amount and the comparison result.

2. A wind-storage-hydrogen electrolysis system according to claim 1, characterized in that: The system also includes an electrochemical energy storage module, which is communicatively connected to the control module.

3. A wind-storage-hydrogen electrolysis system according to claim 2, characterized in that: The system also includes a PCS unit, which is connected to the power generation module, the electrochemical energy storage module and the hydrogen energy storage module respectively.

4. A control method for the wind-storage-hydrogen electrolysis system according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: S1, the control module determines whether the current system is in abnormal power and whether the current hydrogen storage capacity is within a preset range, and obtains a comparison result; S11, if it is in abnormal power and the current hydrogen storage capacity is within the preset range, adjusting the operating conditions of the electrolyzer unit and the fuel cell unit; S12: If the power is abnormal and the current hydrogen storage capacity is within a preset range, the operating conditions of the electrolyzer unit and the fuel cell unit are adjusted according to the comparison result.

5. The control method according to claim 4, characterized in that: The preset ranges are sequentially set to include a first preset range, a second preset range, a third preset range and a fourth predicted range according to the capacity of the hydrogen storage tank.

6. The control method according to claim 5, characterized in that: The abnormal power includes surplus power and shortfall power, wherein the surplus power is wind power generation power minus grid load power, and the shortfall power is grid load power minus wind power generation power.

7. The control method according to claim 6, characterized in that: The step S11 specifically includes the following steps: S111, if there is surplus power and the current hydrogen storage amount is within a first preset range, the electrolyzer unit operates at reduced power and the fuel cell unit operates at rated power; S112, if it is surplus power and the current hydrogen storage capacity is within the second preset range, the electrolyzer unit and the fuel cell unit are both operated at rated power; S113, if it is the shortfall power and the current hydrogen storage capacity is within the second preset range, the electrolyzer unit and the fuel cell unit are both operated at rated power; S114: If it is a power shortage and the current hydrogen storage capacity is within a fourth preset range, both the electrolyzer unit and the fuel cell unit are shut down.

8. The control method according to claim 6, characterized in that: The step S12 specifically includes the following steps: S121. If it is a power deficit, the current hydrogen storage capacity is within a first preset range and the power deficit is greater than the rated power of the fuel cell unit, the electrolyzer unit operates at reduced power and the fuel cell unit operates at rated power.

9. The control method according to claim 6, characterized in that: The step S12 further specifically includes the following steps: S122: If it is a power deficit, the current hydrogen storage capacity is within a first preset range and the power deficit is less than the rated power of the fuel cell unit, the electrolyzer unit operates at reduced power and the fuel cell unit operates at rated power.

10. The control method according to claim 6, characterized in that: The step S12 further specifically includes the following steps: S123, if it is surplus power, the current hydrogen storage capacity is within the third preset range and the surplus power is greater than the electrolyzer power which is the rated power, the electrolyzer unit is operated at the rated power and the fuel cell unit is shut down; S124: If it is surplus power, the current hydrogen storage capacity is in a third preset range and the surplus power is less than the electrolyzer power which is the rated power, the electrolyzer unit is operated at the rated power and the fuel cell unit is shut down.

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