Wind-solar power generation collaborative hybrid electrolytic hydrogen production control system and method

Abstract

The invention discloses a wind-solar power generation collaborative hybrid electrolytic hydrogen production control system and method. The wind-solar power generation total power input by a photovoltaic power generation unit and a wind power generation unit is compared with the rated working power of an ALK electrolytic bath and the rated working power of a PEM electrolytic bath; judging whether the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient or not according to a comparison result; and the working states of the ALK electrolytic bath and the PEM electrolytic bath are adjusted according to whether the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient or not. By means of the method, continuous operation of the ALK and PEM electrolytic cells can be guaranteed as far as possible, the outage condition of the ALK and PEM electrolytic cells is reduced, stable and efficient operation of the mixed electrolytic cells is achieved, and the wind and electricity abandoning phenomenon of the new energy power station is reduced to the maximum extent.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production from renewable energy, and in particular to a control system and method for hydrogen production based on wind-solar power generation and hybrid electrolysis. Background Art

[0002] my country is vigorously promoting the construction of new power systems, and renewable energy power generation continues to develop rapidly. Wind and solar power output is seriously affected by seasons and weather, and it is difficult to get rid of the natural defects of intermittent, volatile, and random. In addition, the problem of wind and power abandonment caused by insufficient grid absorption capacity is also a pain point for the large-scale development of wind power / photovoltaic.

[0003] Hydrogen energy is a secondary energy source that is abundant in source, green and low-carbon, widely used, and can be used as a large-scale long-term energy storage medium. The electrolysis of water to produce hydrogen technology uses wind and solar power generation to electrolyze water to produce green hydrogen. At the same time, the system can be equipped with a battery energy storage system to stabilize the system; this "wind and solar power generation + hydrogen production + energy storage" method will promote the large-scale consumption of wind power and photovoltaic power generation and the large-scale supply of green hydrogen, realize the cascade utilization of energy, and improve energy utilization.

[0004] According to the working principle and electrolyte, water electrolysis hydrogen production technology can be divided into: alkaline water electrolysis (ALK), proton exchange membrane water electrolysis (PEM), high temperature solid oxide water electrolysis (SOEC) and solid polymer anion exchange membrane water electrolysis (AEM). At present, alkaline water electrolysis technology is the most mature, with relatively low cost, and has been fully commercialized. At present, most renewable energy hydrogen production projects have adopted alkaline water electrolysis technology, but it has problems such as slow response speed and narrow power supply fluctuation range; PEM water electrolysis technology is in the early stage of commercialization and has high cost, but it has the advantages of fast response speed and wide power supply fluctuation range; SOEC and AEM technologies are still in the research and development and demonstration stage, and have not yet been commercialized in China.

[0005] In order to improve the utilization rate of wind and solar resources and the amount of hydrogen produced in the wind-solar hybrid hydrogen production system and solve the problems existing in the two types of electrolyzers (ALK and PEM), it is possible to consider using a hybrid ALK and PEM electrolyzer hydrogen production solution, mixing the low-cost ALK electrolyzer with the PEM electrolyzer that is better adapted to the volatility of wind and solar power, so as to achieve low-cost ALK large-scale water electrolysis for hydrogen production while improving the operational stability of the wind-solar hydrogen production system. However, there is still little research on the operation and control of the ALK and PEM hybrid electrolyzer hydrogen production system. How to make ALK and PEM operate efficiently in a hybrid manner and give full play to the advantages of both to achieve efficient utilization of renewable energy power is an urgent problem to be solved. Summary of the invention

[0006] The purpose of the present invention is to address the relatively few control studies on how to make ALK and PEM electrolyzers operate efficiently in a mixed manner in the prior art, and thus propose a control system and method for hydrogen production based on wind-solar power generation and synergistic hybrid electrolysis. The present invention controls the working states of the photovoltaic power generation unit and the wind power generation unit, the alkaline electrolyzer, the proton exchange membrane electrolyzer and the energy storage system by judging the total power of wind and solar power generation, the rated power of the alkaline electrolyzer, the rated power of the proton exchange membrane electrolyzer, the output of the energy storage system and the state of charge. The method described in the present invention can ensure the continuous operation of ALK and PEM electrolyzers as much as possible, reduce the outage of ALK and PEM electrolyzers, achieve stable and efficient operation of the hybrid electrolyzer, and minimize the abandonment of wind and power in new energy power stations.

[0007] To achieve this purpose, the first aspect of the present invention is a wind-solar power generation coordinated hybrid electrolysis hydrogen production control system, which includes a wind-solar power judgment module and an electrolyzer operation control module;

[0008] The wind-solar power judgment module compares the total wind-solar power input by the photovoltaic power generation unit and the wind power generation unit with the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer, and judges whether the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient through the comparison results;

[0009] The electrolyzer operation control module adjusts the working states of the ALK electrolyzer and the PEM electrolyzer according to whether the wind and solar power input by the photovoltaic power generation unit and the wind power generation unit is sufficient.

[0010] Preferably, the total wind-solar power input by the photovoltaic power generation unit and the wind power generation unit is compared with the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer, respectively, and the specific method for judging whether the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient by comparing the results is:

[0011] When the total wind-solar power generation power and the rated working power of the ALK electrolyzer satisfy formula (1), it is determined whether the total wind-solar power generation power, the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer satisfy formula (2). When formula (2) is satisfied, it is further determined whether the total wind-solar power generation power, the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer satisfy formula (3). When formula (3) is satisfied, it indicates that the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient. Otherwise, it indicates that the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is insufficient:

[0012] P WT+PV -P alk ≥0 (1)

[0013] Where P WT+PV Represents the total power of wind and solar power generation, P alk Represents the rated operating power of the ALK electrolyzer;

[0014] P WT+PV -P alk -βP pem ≥0 (2)

[0015] Where P WT+PV Represents the total power of wind and solar power generation, P alk Represents the rated operating power of the ALK electrolyzer, P pem represents the rated operating power of the PEM electrolyzer, and β represents the minimum operating power coefficient of the PEM electrolyzer;

[0016] P WT+PV -P alk -P pem ≥0 (3)

[0017] Where P WT+PV Represents the total power of wind and solar power generation, P alk Represents the rated operating power of the ALK electrolyzer, P pem Represents the rated operating power of the PEM electrolyzer.

[0018] More preferably, the specific method for adjusting the working state of the ALK electrolyzer and the PEM electrolyzer according to whether the wind and solar power input by the photovoltaic power generation unit and the wind power generation unit is sufficient is:

[0019] When the photovoltaic power generation unit and the wind power generation unit have sufficient wind and solar power, the ALK electrolyzer and the PEM electrolyzer are controlled to operate at rated load;

[0020] When the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is insufficient, the relationship between the total wind and solar power generation power and the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer will continue to be judged, and the working states of the ALK electrolyzer and the PEM electrolyzer will be adjusted according to the corresponding relationship.

[0021] Further preferably, when the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is insufficient, the relationship between the total wind and solar power generation power and the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer is continuously determined, and the specific method for adjusting the working state of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship is:

[0022] When judging formula (1), formula (2) and formula (3) in sequence, if formula (1) is satisfied but formula (2) is not satisfied, the ALK electrolyzer is controlled to operate at rated load and the PEM electrolyzer is controlled to stop operating. If formula (1) and formula (2) are satisfied in sequence but formula (3) is not satisfied, the ALK electrolyzer is controlled to operate at rated load and the PEM electrolyzer is controlled to stop operating. pem ~P pem Operate under load;

[0023] When the relationship between the total wind and solar power generation power and the rated operating power of the ALK electrolyzer does not satisfy formula (1), the relationship between the total wind and solar power generation power and the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer is further determined, and the working states of the ALK electrolyzer and the PEM electrolyzer are adjusted according to the corresponding relationship.

[0024] More preferably, when the relationship between the total wind-solar power generation and the rated working power of the ALK electrolyzer does not satisfy formula (1), the relationship between the total wind-solar power generation and the rated working power of the ALK electrolyzer is further determined, and the specific method for adjusting the working states of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship is:

[0025] When the total wind and solar power generation power and the rated working power of the ALK electrolyzer satisfy the following formula, the ALK electrolyzer is controlled at αP alk ~P alk and control the PEM electrolyzer to stop operating; otherwise, continue to judge the relationship between the total wind and solar power generation power and the rated working power of the PEM electrolyzer, and adjust the working states of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship.

[0026] P WT+PV ≥αP alk (4)

[0027] Where P WT+PV Represents the total power of wind and solar power generation, P alk Represents the rated operating power of the ALK electrolyzer, and α represents the minimum operating power coefficient of the ALK electrolyzer.

[0028] Further preferably, when the relationship between the total wind-solar power generation and the rated working power of the ALK electrolyzer does not satisfy equations (1) and (4) respectively, the relationship between the total wind-solar power generation and the rated working power of the PEM electrolyzer is further determined, and the specific method for adjusting the working states of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship is:

[0029] When the total wind and solar power generation power and the rated working power of the PEM electrolyzer satisfy the following formula, the PEM electrolyzer is controlled at βP pem ~P pem The ALK electrolyzer is operated under load and the ALK electrolyzer is shut down.

[0030] P WT+PV ≥βP pem (5)

[0031] Where P WT+PV Represents the total power of wind and solar power generation, P pem represents the rated operating power of the PEM electrolyzer, and β represents the minimum operating power coefficient of the PEM electrolyzer.

[0032] Further preferably, the system further comprises an energy storage battery unit. When the relationship between the total wind-solar power generation and the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer does not satisfy equations (1), (4) and (5) respectively, and the relationship between the total wind-solar power generation, the rated working power of the ALK electrolyzer, the output power of the energy storage battery unit and the state of charge satisfies equations (6) and (7) respectively, the energy storage battery unit discharges to the ALK electrolyzer, so that the ALK electrolyzer is at αP alk ~P alk and control the PEM electrolyzer to stop operating; otherwise, continue to judge the relationship between the total wind and solar power generation power and the rated working power of the PEM electrolyzer and the output power of the energy storage battery unit, and adjust the working states of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship.

[0033] SOC>SOC min (6)

[0034] In the formula, SOC represents the state of charge of the energy storage battery unit, SOC is 0.1~0.9, SOC min Represents the minimum state of charge of the energy storage battery unit;

[0035] P WT+PV +P bat ≥αP alk (7)

[0036] Where P WT+PV Represents the total power of wind and solar power generation, P alk represents the rated working power of the ALK electrolyzer, α represents the minimum working power coefficient of the ALK electrolyzer, α is 0.25~0.5, P bat Represents the output power of the energy storage battery unit.

[0037] Further preferably, when the relationship between the total wind-solar power generation and the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer does not satisfy equations (1), (4) and (5) respectively, and the relationship between the total wind-solar power generation, the rated working power of the ALK electrolyzer, the output power of the energy storage battery unit and the state of charge satisfies equation (6) but does not satisfy equation (7), the total wind-solar power generation is compared with the rated working power of the PEM electrolyzer and the output power of the energy storage battery unit respectively. When the following formula is satisfied, the energy storage battery unit discharges to the PEM electrolyzer, so that the PEM electrolyzer is at βP pem ~P pem The ALK electrolyzer is operated under load and controlled to shut down:

[0038] P WT+PV +P bat ≥βP pem (8)

[0039] Where P WT+PV Represents the total power of wind and solar power generation, P pem represents the rated working power of the PEM electrolyzer, β represents the minimum working power coefficient of the PEM electrolyzer, β is 0.05~0.1, P bat Represents the output power of the energy storage battery unit;

[0040] If the relationship among the total wind and solar power generation power, the rated operating power of the ALK electrolyzer, the rated operating power of the PEM electrolyzer, the output power of the energy storage battery unit and the state of charge does not satisfy equation (6), or satisfies equation (6) but does not satisfy equations (7) and (8) in turn, then the ALK electrolyzer and the PEM electrolyzer are controlled to shut down.

[0041] Further preferably, when the state of charge in the energy storage battery unit satisfies the following formula, it means that the energy storage battery unit is not charged, otherwise, it means that the energy storage battery unit is charged,

[0042] SOC=SOC max (9)

[0043] In the formula, SOC represents the state of charge of the energy storage battery unit, SOC is 0.1~0.9, SOC max Represents the highest state of charge of the energy storage battery unit.

[0044] The second aspect of the present invention is a method for controlling hydrogen production based on wind-solar power generation and hybrid electrolysis, which includes the following:

[0045] Compare the total wind-solar power input by the photovoltaic power generation unit and the wind power generation unit with the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer, and judge whether the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient through the comparison results;

[0046] The working states of the ALK electrolyzer and the PEM electrolyzer are adjusted according to whether the wind and solar power of the photovoltaic power generation unit and the wind power generation unit are sufficient.

[0047] Beneficial effects of the present invention:

[0048] (1) The present invention first determines whether the wind and solar power is sufficient by comparing the relationship between the total wind and solar power generation power, the rated power of the ALK electrolyzer, and the rated power of the PEM electrolyzer. When the wind and solar power is sufficient, the ALK and PEM electrolyzers operate normally and charge the energy storage battery. When the wind and solar power is gradually insufficient but has not reached the lowest point, the ALK electrolyzer is prioritized to operate, the energy storage battery is discharged, and the PEM electrolyzer is operated at a low load or shut down, thereby minimizing the number of starts and stops of the ALK electrolyzer. Because the ALK electrolyzer starts slowly, while the PEM electrolyzer starts quickly, reducing the number of starts of the ALK electrolyzer can improve the continuity, stability and hydrogen production efficiency of the system operation. Until the wind and solar power reaches the lowest point, the advantage of the PEM electrolyzer in being able to operate at a lower load than the ALK electrolyzer is fully utilized, more wind and solar power is consumed, more hydrogen is prepared, and the number of shutdowns of the hydrogen production system is reduced. When the wind and solar power output is low, the system is guaranteed to produce hydrogen stably to the maximum extent;

[0049] (2) The present invention fully utilizes the advantages of ALK electrolyzers, such as low cost and large scale, and PEM electrolyzers, such as fast startup, fast response to wind and solar fluctuations, and wide adaptability to wind and solar fluctuations, to overcome the disadvantages of ALK electrolyzers, such as slow startup, slow response to wind and solar fluctuations, and narrow adaptability to wind and solar fluctuations, and PEM electrolyzers, such as high cost and small scale, to achieve large-scale consumption of wind and solar power, reduce the number of system start-up and shutdown times, improve system operation continuity, stability and hydrogen production efficiency, and at the same time minimize the phenomenon of wind and power abandonment in new energy power stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a structural block diagram of a control system for hydrogen production based on wind-solar power generation and hybrid electrolysis in one embodiment of the present invention;

[0051] Figure 2 It is a schematic flow chart of a method for controlling hydrogen production based on wind-solar power generation coordinated hybrid electrolysis according to an embodiment of the present invention;

[0052] Figure 3It is a schematic diagram of the connection relationship between the photovoltaic power generation unit, the wind power generation unit, the energy storage battery unit, the ALK electrolyzer, and the PEM electrolyzer in a wind-solar power generation coordinated hybrid electrolysis hydrogen production control system according to one embodiment of the present invention;

[0053] Figure 4 This is a flow chart of the control method for hydrogen production based on wind-solar power generation coordinated hybrid electrolysis according to Example 3 of the present invention. DETAILED DESCRIPTION

[0054] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0055] Example 1

[0056] A control system for hydrogen production based on wind and solar power generation and hybrid electrolysis, such as Figure 1 As shown, it includes a wind and solar power judgment module and an electrolyzer operation control module;

[0057] The wind-solar power judgment module compares the total wind-solar power input by the photovoltaic power generation unit and the wind power generation unit with the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer, and judges whether the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient through the comparison results;

[0058] The electrolyzer operation control module adjusts the working states of the ALK electrolyzer and the PEM electrolyzer according to whether the wind and solar power input by the photovoltaic power generation unit and the wind power generation unit is sufficient.

[0059] In the above technical solution, the system also includes a data acquisition module, which obtains the rated operating power, minimum operating power coefficient and charge state of the ALK and PEM electrolyzers and the energy storage battery based on the existing ALK and PEM electrolyzer product parameters and energy storage battery performance parameters on the market.

[0060] In the above technical solution, the total wind-solar power input by the photovoltaic power generation unit and the wind power generation unit is compared with the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer, and the specific method for judging whether the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient by comparing the results is:

[0061] When the total wind-solar power generation power and the rated working power of the ALK electrolyzer satisfy formula (1), it is determined whether the total wind-solar power generation power, the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer satisfy formula (2). When formula (2) is satisfied, it is further determined whether the total wind-solar power generation power, the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer satisfy formula (3). When formula (3) is satisfied, it indicates that the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient. Otherwise, it indicates that the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is insufficient:

[0062] P WT+PV -P alk ≥0 (1)

[0063] Where P WT+PV Represents the total power of wind and solar power generation, P alk Represents the rated operating power of the ALK electrolyzer;

[0064] P WT+PV -P alk -βP pem ≥0 (2)

[0065] Where P WT+PV Represents the total power of wind and solar power generation, P alk Represents the rated operating power of the ALK electrolyzer, P pem represents the rated operating power of the PEM electrolyzer, and β represents the minimum operating power coefficient of the PEM electrolyzer;

[0066] P WT+PV -P alk -P pem ≥0 (3)

[0067] Where P WT+PV Represents the total power of wind and solar power generation, P alk Represents the rated operating power of the ALK electrolyzer, P pem Represents the rated operating power of the PEM electrolyzer. In this article, β is the minimum operating power coefficient of the PEM electrolyzer, which is usually 0.05-0.1 and varies from one electrolyzer product to another.

[0068] In the above technical solution, the specific method for adjusting the working state of the ALK electrolyzer and the PEM electrolyzer according to whether the wind and solar power input by the photovoltaic power generation unit and the wind power generation unit is sufficient is:

[0069] When the photovoltaic power generation unit and the wind power generation unit have sufficient wind and solar power, the ALK electrolyzer and the PEM electrolyzer are controlled to operate at rated load;

[0070] When the wind and solar power of the photovoltaic power generation unit and the wind power generation unit are insufficient, the relationship between the total wind and solar power generation power and the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer is determined, and the working states of the ALK electrolyzer and the PEM electrolyzer are adjusted according to the corresponding relationship.

[0071] In the above technical solution, when the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is insufficient, the relationship between the total wind and solar power generation power and the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer is continuously determined, and the specific method for adjusting the working state of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship is:

[0072] When the relationship between the total wind-solar power generation, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer satisfies equation (1) but does not satisfy equation (2) or equation (3), the ALK electrolyzer is controlled to operate at rated load, and the PEM electrolyzer is controlled to shut down or operate at βP pem ~P pem ; In this article, when judging the relationship between the total wind-solar power generation, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer, the judgment is carried out in accordance with the method of judging formula (1), formula (2), and formula (3) in sequence. The purpose is to make full use of solar energy and wind energy, reduce wind and solar power abandonment, and make full use of wind and solar power in the order of ALK-PEM-energy storage battery charging. Specifically, when the relationship between the total wind-solar power generation, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer is: if formula (1) is satisfied and formula (2) is not satisfied, the ALK electrolyzer is controlled to operate at the rated load, and the PEM electrolyzer is controlled to be shut down; if formula (1) and formula (2) are satisfied and formula (3) is not satisfied, the ALK electrolyzer is controlled to operate at the rated load, and the PEM electrolyzer is controlled to be shut down. pem ~P pem In this article, shutdown means that its input power is 0 and it stops working.

[0073] When the relationship between the total wind and solar power generation power and the rated working power of the ALK electrolyzer does not satisfy formula (1), the relationship between the total wind and solar power generation power and the rated working power of the ALK electrolyzer continues to be determined, and the working states of the ALK electrolyzer and the PEM electrolyzer are adjusted according to the corresponding relationship.

[0074] In the above technical solution, when the relationship between the total wind-solar power generation and the rated working power of the ALK electrolyzer does not satisfy formula (1), the relationship between the total wind-solar power generation and the rated working power of the ALK electrolyzer is further determined, and the specific method for adjusting the working states of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship is:

[0075] When the total wind-solar power generation power and the rated working power of the ALK electrolyzer satisfy the following formula, that is, the total wind-solar power generation power and the rated working power of the ALK electrolyzer do not satisfy formula (1) but satisfy formula (4), the ALK electrolyzer is controlled at αP alk ~P alk otherwise, continue to judge the relationship between the total wind and solar power generation power and the rated working power of the PEM electrolyzer, and adjust the working states of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship.

[0076] P WT+PV ≥αP alk (4)

[0077] Where P WT+PV Represents the total power of wind and solar power generation, P alk Represents the rated operating power of the ALK electrolyzer, and α represents the minimum operating power coefficient of the ALK electrolyzer. In this article, α is the minimum operating power coefficient of the alkaline electrolyzer, which is usually 0.25-0.5, and varies from one electrolyzer product to another.

[0078] In the above technical solution, when the total wind-solar power generation power and the rated working power of the ALK electrolyzer do not satisfy equations (1) and (4), the relationship between the total wind-solar power generation power and the rated working power of the PEM electrolyzer is further determined, and the specific method for adjusting the working states of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship is as follows:

[0079] When the total wind-solar power generation and the rated operating power of the PEM electrolyzer satisfy the following formula, that is, the total wind-solar power generation and the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer do not satisfy formula (1) (4) but satisfy formula (5), the PEM electrolyzer is controlled at βP pem ~P pem The ALK electrolyzer is operated under load and the ALK electrolyzer is shut down.

[0080] P WT+PV ≥βP pem (5)

[0081] Where P WT+PV Represents the total power of wind and solar power generation, P pemrepresents the rated operating power of the PEM electrolyzer, and β represents the minimum operating power coefficient of the PEM electrolyzer.

[0082] In this article, when the relationship between the total wind and solar power generation power, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer satisfies the following four conditions: satisfies formula (1) but does not satisfy formula (2), satisfies formula (1) (2) but does not satisfy formula (3), does not satisfy formula (1) and satisfies formula (4), does not satisfy formula (1) (4) and satisfies formula (5), the power generated by wind and solar power generation is insufficient, but the ALK electrolyzer or PEM electrolyzer can be maintained to operate at a low load, so there is no need for the energy storage battery unit to discharge to the ALK electrolyzer or PEM electrolyzer.

[0083] In the above technical solution, the system also includes an energy storage battery unit. When the total wind-solar power generation and the rated working power of the PEM electrolyzer do not satisfy formula (5), that is, they do not satisfy formula (1), (4), (5) at the same time, and the total wind-solar power generation, the rated working power of the ALK electrolyzer, the output power of the energy storage battery unit and the state of charge satisfy the following formula at the same time, the energy storage battery unit is controlled to discharge to the ALK electrolyzer, so that the ALK electrolyzer is at αP alk ~P alk and control the PEM electrolyzer to stop operating; otherwise, continue to judge the relationship between the total wind and solar power generation power and the rated working power of the PEM electrolyzer and the output power of the energy storage battery unit, and adjust the working states of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship.

[0084] SOC>SOC min (6)

[0085] In the formula, SOC represents the state of charge of the energy storage battery unit, which is numerically defined as the ratio of the remaining capacity to the battery capacity, usually ranging from 0.1 to 0.9; SOC min Represents the lowest state of charge of the energy storage battery unit. Generally, SOC min It can be 0.1, indicating that the energy storage battery unit still has 0.1 times the total capacity of electrical energy reserves remaining;

[0086] P WT+PV +P bat ≥αP alk (7)

[0087] Where P WT+PV Represents the total power of wind and solar power generation, P alk represents the rated working power of the ALK electrolyzer, α represents the minimum working power coefficient of the ALK electrolyzer, P bat Represents the output power of the energy storage battery unit, indicating the ability of the energy storage battery unit to discharge and do work.

[0088] In the above technical solution, when the total wind-solar power generation, the rated working power of the ALK electrolyzer, the output power of the energy storage battery unit and the state of charge satisfy formula (6) and do not satisfy formula (7), the total wind-solar power generation is compared with the rated working power of the PEM electrolyzer and the output power of the energy storage battery unit. When the following formula is satisfied, the energy storage battery unit is controlled to discharge so that the PEM electrolyzer is at βP pem ~P pem The ALK electrolyzer is operated under load and controlled to shut down:

[0089] P WT+PV +P bat ≥βP pem (8)

[0090] Where P WT+PV Represents the total power of wind and solar power generation, P pem represents the rated operating power of the PEM electrolyzer, β represents the minimum operating power coefficient of the PEM electrolyzer, P bat Represents the output power of the energy storage battery unit;

[0091] In the above technical solution, as long as the relationship between the total wind and solar power generation power, the rated operating power of the ALK electrolyzer, the rated operating power of the PEM electrolyzer, the output power of the energy storage battery unit and the state of charge does not satisfy equation (6), or satisfies equation (6) but does not satisfy equations (7) and (8), the ALK electrolyzer and the PEM electrolyzer are controlled to shut down.

[0092] In the above technical solution, when the state of charge in the energy storage battery unit satisfies the following formula, it means that the energy storage battery unit is not charged, otherwise, it means that the energy storage battery unit is charged.

[0093] SOC=SOC max (9)

[0094] Where SOC max Represents the maximum state of charge of the energy storage battery unit. Generally, the maximum state of charge can be 0.9, which means that the energy storage battery still has 0.9 times the total capacity of energy reserves remaining.

[0095] In the above technical solution, the connection relationship between the photovoltaic power generation unit, the wind power generation unit, the energy storage battery unit, the ALK electrolyzer, and the PEM electrolyzer in the system is as follows: Figure 3As shown, the wind power generation unit is connected to the DC bus through an AC / DC converter, the photovoltaic power generation unit is connected to the DC bus through a DC / DC converter, and the energy storage battery unit is connected to the DC bus through a bidirectional DC / DC converter. When the DC bus voltage is high, the energy storage battery unit is charged; when the DC bus voltage is low, the energy storage battery unit will discharge, the DC bus is connected to the alkaline electrolyzer (ALK) through the DC / DC converter, and the DC bus is connected to the PEM electrolyzer through the DC / DC converter.

[0096] Example 2

[0097] A control method for hydrogen production based on wind and solar power generation synergistic hybrid electrolysis, such as Figure 2 As shown, it includes the following:

[0098] Compare the total wind-solar power input by the photovoltaic power generation unit and the wind power generation unit with the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer, and judge whether the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient through the comparison results;

[0099] The working states of the ALK electrolyzer and the PEM electrolyzer are adjusted according to whether the wind and solar power of the photovoltaic power generation unit and the wind power generation unit are sufficient.

[0100] In this article, when the total wind-solar power generation power, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer simultaneously satisfy equations (1), (2), and (3), the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient. When the wind-solar power is sufficient, the operation of the electrolyzer and the energy storage battery unit is as follows:

[0101] (I) When the following conditions are met, the ALK and PEM electrolyzers are operated at rated load, the energy storage battery units are not charged, and the remaining power is abandoned: P WT+PV -P alk ≥0; P WT+PV -P alk -βP pem ≥0; P WT+PV -P alk -P pem ≥0; SOC=SOC max ;

[0102] (II) When the following conditions are met, the ALK and PEM electrolyzers are operated at rated load, the energy storage battery units are charged, and the remaining power is abandoned: P WT+PV -P alk ≥0; P WT+PV -P alk -βP pem ≥0; P WT+PV -Palk -P pem ≥0; SOC<SOC max .

[0103] The following situation is that the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is insufficient. In this article, when the relationship between the total wind and solar power generation power, the rated working power of the ALK electrolyzer, and the rated working power of the PEM electrolyzer satisfies formula (1) and does not satisfy formula (2) or formula (3), in this case, the operation of the electrolyzer and the energy storage battery unit is as follows:

[0104] (III) When the following conditions are met, the ALK electrolyzer operates at rated load, the PEM electrolyzer operates at low load, and the energy storage battery unit is not charged: P WT+PV -P alk ≥0; P WT+PV -P alk -βP pem ≥0; P WT+PV -P alk -P pem <0;

[0105] (IV) When the following conditions are met, the ALK electrolyzer operates at rated load, the PEM electrolyzer is shut down, the energy storage battery unit is not charged, and the remaining power is abandoned: P WT+PV -P alk ≥0; P WT+PV -P alk -βP pem <0; SOC = SOC max ;

[0106] (V) When the following conditions are met, the ALK electrolyzer operates at rated load, the PEM electrolyzer is shut down, the energy storage battery unit is charged, and the remaining power is abandoned: P WT+PV -P alk ≥0; P WT+PV -P alk -βP pem <0;SOC<SOC max .

[0107] In this article, when the relationship between the total wind and solar power generation power and the rated working power of the ALK electrolyzer does not satisfy equation (1) but satisfies equation (4), in this case, the operation of the electrolyzer and the energy storage battery unit is as follows:

[0108] (VI) When the following conditions are met, the ALK electrolyzer operates at low load, the PEM electrolyzer is shut down, and the energy storage battery unit is not charged: P WT+PV -P alk <0;P WT+PV ≥αP alk .

[0109] In this article, when the relationship between the total wind and solar power generation power, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer does not satisfy equation (1) (4) but satisfies equation (5), in this case, the operation of the electrolyzer and the energy storage battery unit is as follows:

[0110] (VII) When the following conditions are met, the ALK electrolyzer is shut down, the PEM electrolyzer operates at low load, and the energy storage battery unit is not charged: P WT+PV -P alk <0;P WT+PV <αP alk ;P WT+PV ≥βP pem .

[0111] In this article, when the relationship between the total wind and solar power generation power, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer does not satisfy equation (1) (4) or equation (5), the energy storage battery unit needs to discharge to the electrolyzer. Specifically, when the charge state of the energy storage battery unit satisfies equation (6), the energy storage battery unit is determined to be in a discharge state. In this case, the operation of the electrolyzer and the energy storage battery unit is as follows:

[0112] (VIII) When the following conditions are met, the energy storage battery unit discharges and the ALK electrolyzer is at αP alk Operation, PEM electrolyzer shutdown: P WT+PV -P alk <0;P WT+PV <αP alk ;P WT+PV <βP pem ; SOC>SOC min ;P WT+PV +P bat ≥αP alk ;

[0113] (IX) When the following conditions are met, the energy storage battery unit discharges and the PEM electrolyzer is at βP pem Operation, ALK electrolyzer out of operation: P WT+PV -P alk <0;P WT+PV <αP alk ;P WT+PV <βP pem ; SOC>SOC min ;P WT+PV +P bat <αP alk ;P WT+PV +P bat ≥βP pem .

[0114] In this article, both ALK and PEM electrolyzers are shut down. In this case, the operation of the electrolyzer and energy storage battery unit is as follows:

[0115] (X) When the following conditions are met, the ALK and PEM electrolyzers will be shut down, the energy storage battery units will not be charged, and the remaining power will be abandoned: P WT+PV -P alk <0;P WT+PV <αP alk ;P WT+PV <βP pem ; SOC>SOC min ;P WT+PV +P bat <αP alk ;P WT+PV +P bat <βP pem ; SOC = SOC max ;

[0116] (XI) When the following conditions are met, the ALK and PEM electrolyzers are shut down, the energy storage battery units are charged, and the remaining power is abandoned: P WT+PV -P alk <0;P WT+PV <αP alk ;P WT+PV <βP pem ; SOC>SOC min ;P WT+PV +P bat <αP alk ;P WT+PV +P bat <βP pem ; SOC<SOC max ;

[0117] (XII) When the following conditions are met, the ALK and PEM electrolyzers are shut down, the energy storage battery units are charged, and the remaining power is abandoned: P WT+PV -P alk <0;P WT+PV <αP alk ;P WT+PV <βP pem ; SOC = SOC min .

[0118] Example 3

[0119] When the hybrid hydrogen production system is running, Figure 4 As shown, according to the total wind and solar power generation power P input to the system WT+PV , and the rated operating power P of the alkaline electrolyzer alk , the rated working power P of the PEM electrolyzer pem, energy storage battery unit output Pbat, energy storage battery unit state of charge SOC and other indicators, and based on the existing ALK and PEM electrolyzer product parameters and energy storage battery unit performance parameters on the market, assuming that the minimum working power coefficient of the alkaline electrolyzer is α=0.3, the minimum working power coefficient of the PEM electrolyzer is β=0.1, SOC max =0.9 and SOC min =0.1, carry out the following control:

[0120] (1)P WT+PV -P alk ≥0; P WT+PV -P alk -0.1P pem ≥0; P WT+PV -P alk -P pem ≥0; SOC=0.9: ALK and PEM electrolyzers operate at rated load, the energy storage battery unit is not charged, and the remaining power is abandoned;

[0121] (2)P WT+PV -P alk ≥0; P WT+PV -P alk -0.1P pem ≥0; P WT+PV -P alk -P pem ≥0; SOC<0.9: ALK and PEM electrolyzers operate at rated load, energy storage battery units are charged, and the remaining power is abandoned;

[0122] (3)P WT+PV -P alk ≥0; P WT+PV -P alk -0.1P pem ≥0; P WT+PV -P alk -P pem <0: ALK electrolyzer operates at rated load, PEM electrolyzer operates at 10%P pem During operation, the energy storage battery unit is not charged;

[0123] (4)P WT+PV -P alk ≥0; P WT+PV -P alk -0.1P pem <0; SOC = 0.9: ALK electrolyzer operates at rated load, PEM electrolyzer is shut down, energy storage battery unit is not charged, and the remaining power is abandoned;

[0124] (5)P WT+PV -P alk ≥0; P WT+PV -Palk -0.1P pem <0; SOC <0.9: ALK electrolyzer operates at rated load, PEM electrolyzer is shut down, energy storage battery unit is charged, and the remaining power is abandoned;

[0125] (6)P WT+PV -P alk <0;P WT+PV ≥0.3P alk ALK electrolyzer with 30% P alk Operation, the PEM electrolyzer is shut down, and the energy storage battery unit is not charged;

[0126] (7)P WT+PV -P alk <0;P WT+PV <0.3P alk ;P WT+PV ≥0.1P pem : ALK electrolyzer shut down, PEM electrolyzer at 10% P pem During operation, the energy storage battery unit is not charged;

[0127] (8)P WT+PV -P alk <0;P WT+PV <0.3P alk ;P WT+PV <0.1P pem ; SOC>0.1; P WT+PV +P bat ≥0.3P alk : Energy storage battery unit discharge, ALK electrolyzer at 30% P alk Operation, PEM electrolyzer shut down;

[0128] (9)P WT+PV -P alk <0;P WT+PV <0.3P alk ;P WT+PV <0.1P pem ; SOC>0.1; P WT+PV +P bat <0.3P alk ;P WT+PV +P bat ≥0.1P pem :Energy storage battery unit discharges, PEM electrolyzer at 10% P pem Operation, ALK electrolyzer shut down;

[0129] (10)P WT+PV -P alk <0;P WT+PV <0.3P alk ;PWT+PV <0.1P pem ; SOC>0.1; P WT+PV +P bat <0.3P alk ;P WT+PV +P bat <0.1P pem ; SOC = 0.9: ALK and PEM electrolyzers are shut down, the energy storage battery unit is not charged, and the remaining power is abandoned;

[0130] (11)P WT+PV -P alk <0;P WT+PV <0.3P alk ;P WT+PV <0.1P pem ; SOC>0.1; P WT+PV +P bat <0.3P alk ;P WT+PV +P bat <0.1P pem ; SOC<0.9: ALK and PEM electrolyzers are shut down, the energy storage battery units are charged, and the remaining power is abandoned;

[0131] (12)P WT+PV -P alk <0;P WT+PV <0.3P alk ;P WT+PV <0.1P pem ; SOC = 0.1: ALK and PEM electrolyzers are shut down, the energy storage battery units are charged, and the remaining power is discarded.

[0132] The present invention proposes a control system and method for hydrogen production based on hybrid electrolysis in coordination with wind and solar power generation, making full use of the advantages of ALK electrolyzers in low cost and large scale, and PEM electrolyzers in fast startup, fast response to wind and solar fluctuations, and wide adaptability to wind and solar fluctuations, to overcome the disadvantages of ALK electrolyzers in slow startup, slow response to wind and solar fluctuations, and narrow adaptability to wind and solar fluctuations, and PEM electrolyzers in high cost and small scale, thereby realizing large-scale consumption of wind and solar power, reducing the number of system starts and stops, and improving system operation continuity, stability and hydrogen production efficiency.

[0133] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A control system for hydrogen production based on wind and solar power generation and hybrid electrolysis, characterized by: It includes a wind and solar power judgment module and an electrolyzer operation control module; The wind-solar power judgment module compares the total wind-solar power input by the photovoltaic power generation unit and the wind power generation unit with the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer, and judges whether the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient through the comparison results; The electrolyzer operation control module adjusts the working states of the ALK electrolyzer and the PEM electrolyzer according to whether the wind and solar power input by the photovoltaic power generation unit and the wind power generation unit is sufficient.

2. The control system for hydrogen production based on wind-solar power generation and hybrid electrolysis according to claim 1 is characterized by: The total wind-solar power input by the photovoltaic power generation unit and the wind power generation unit is compared with the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer, and the specific method for judging whether the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient is as follows: When the total wind-solar power generation power and the rated working power of the ALK electrolyzer satisfy formula (1), it is determined whether the total wind-solar power generation power, the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer satisfy formula (2). When formula (2) is satisfied, it is further determined whether the total wind-solar power generation power, the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer satisfy formula (3). When formula (3) is satisfied, it indicates that the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient. Otherwise, it indicates that the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is insufficient: P WT+PV -P alk ≥0 (1) Where P WT+PV Represents the total power of wind and solar power generation, P alk Represents the rated operating power of the ALK electrolyzer; P WT+PV -P alk -βP pem ≥0 (2) Where P WT+PV Represents the total power of wind and solar power generation, P alk Represents the rated operating power of the ALK electrolyzer, P pem represents the rated working power of the PEM electrolyzer, β represents the minimum working power coefficient of the PEM electrolyzer, and β is 0.05-0.1; P WT+PV -P alk -P pem ≥0 (3) Where P WT+PV Represents the total power of wind and solar power generation, P alk Represents the rated operating power of the ALK electrolyzer, P pem Represents the rated operating power of the PEM electrolyzer.

3. The control system for hydrogen production based on wind-solar power generation and hybrid electrolysis according to claim 2 is characterized by: The specific method for adjusting the working state of the ALK electrolyzer and the PEM electrolyzer according to whether the wind and solar power input by the photovoltaic power generation unit and the wind power generation unit is sufficient is as follows: When the photovoltaic power generation unit and the wind power generation unit have sufficient wind and solar power, the ALK electrolyzer and the PEM electrolyzer are controlled to operate at rated load; When the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is insufficient, the relationship between the total wind and solar power generation power and the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer will continue to be judged, and the working states of the ALK electrolyzer and the PEM electrolyzer will be adjusted according to the corresponding relationship.

4. The control system for hydrogen production based on wind-solar power generation and hybrid electrolysis according to claim 3 is characterized by: When the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is insufficient, the relationship between the total wind and solar power generation power and the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer is continuously determined, and the specific method for adjusting the working state of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship is as follows: When judging formula (1), formula (2) and formula (3) in sequence, if formula (1) is satisfied but formula (2) is not satisfied, the ALK electrolyzer is controlled to operate at rated load and the PEM electrolyzer is controlled to stop operating. If formula (1) and formula (2) are satisfied in sequence but formula (3) is not satisfied, the ALK electrolyzer is controlled to operate at rated load and the PEM electrolyzer is controlled to stop operating. pem ~P pem Operate under load; When the relationship between the total wind and solar power generation power and the rated working power of the ALK electrolyzer does not satisfy formula (1), the relationship between the total wind and solar power generation power and the rated working power of the ALK electrolyzer continues to be determined, and the working states of the ALK electrolyzer and the PEM electrolyzer are adjusted according to the corresponding relationship.

5. The control system for hydrogen production based on wind-solar power generation and hybrid electrolysis according to claim 4 is characterized by: When the relationship between the total wind-solar power generation and the rated working power of the ALK electrolyzer does not satisfy formula (1), the relationship between the total wind-solar power generation and the rated working power of the ALK electrolyzer is further determined, and the specific method for adjusting the working states of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship is as follows: When the total wind and solar power generation power and the rated working power of the ALK electrolyzer satisfy the following formula, the ALK electrolyzer is controlled at αP alk ~P alk and control the PEM electrolyzer to stop operating; otherwise, continue to judge the relationship between the total wind and solar power generation power and the rated working power of the PEM electrolyzer, and adjust the working states of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship. P WT+PV ≥αP alk (4) Where P WT+PV Represents the total power of wind and solar power generation, P alk represents the rated working power of the ALK electrolyzer, α represents the minimum working power coefficient of the ALK electrolyzer, and α is 0.25~0.

5.

6. The control system for hydrogen production based on wind-solar power generation and hybrid electrolysis according to claim 5 is characterized by: When the relationship between the total wind-solar power generation and the rated working power of the ALK electrolyzer does not satisfy equations (1) and (4) respectively, the relationship between the total wind-solar power generation and the rated working power of the PEM electrolyzer is further determined, and the specific method for adjusting the working states of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship is as follows: When the total wind and solar power generation power and the rated working power of the PEM electrolyzer satisfy the following formula, the PEM electrolyzer is controlled at βP pem ~P pem The ALK electrolyzer is operated under load and the ALK electrolyzer is shut down. P WT+PV ≥βP pem (5) Where P WT+PV Represents the total power of wind and solar power generation, P pem represents the rated operating power of the PEM electrolyzer, and β represents the minimum operating power coefficient of the PEM electrolyzer.

7. The control system for hydrogen production based on wind-solar power generation and hybrid electrolysis according to claim 6 is characterized by: The system also includes an energy storage battery unit. When the relationship between the total wind-solar power generation and the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer does not satisfy equations (1), (4) and (5) respectively, and the relationship between the total wind-solar power generation, the rated working power of the ALK electrolyzer, the output power of the energy storage battery unit and the state of charge satisfies equations (6) and (7) respectively, the energy storage battery unit discharges to the ALK electrolyzer, so that the ALK electrolyzer is at αP alk ~P alk and control the PEM electrolyzer to stop operating; otherwise, continue to judge the relationship between the total wind and solar power generation power and the rated working power of the PEM electrolyzer and the output power of the energy storage battery unit, and adjust the working states of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship. SOC>SOC min (6) In the formula, SOC represents the state of charge of the energy storage battery unit, SOC is 0.1~0.9, SOC min Represents the minimum state of charge of the energy storage battery unit; P WT+PV +P bat ≥αP alk (7) Where P WT+PV Represents the total power of wind and solar power generation, P alk represents the rated working power of the ALK electrolyzer, α represents the minimum working power coefficient of the ALK electrolyzer, α is 0.25~0.5, P bat Represents the output power of the energy storage battery unit.

8. The control system for hydrogen production based on wind-solar power generation and hybrid electrolysis according to claim 7 is characterized by: When the relationship between the total wind-solar power generation and the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer does not satisfy equations (1), (4) and (5) respectively, and the relationship between the total wind-solar power generation, the rated working power of the ALK electrolyzer, the output power of the energy storage battery unit and the state of charge satisfies equation (6) but does not satisfy equation (7), the total wind-solar power generation is compared with the rated working power of the PEM electrolyzer and the output power of the energy storage battery unit respectively. When the following formula is satisfied, the energy storage battery unit discharges to the PEM electrolyzer, so that the PEM electrolyzer is at βP pem ~P pem The ALK electrolyzer is operated under load and controlled to shut down: P WT+PV +P bat ≥βP pem (8) Where P WT+PV Represents the total power of wind and solar power generation, P pem represents the rated working power of the PEM electrolyzer, β represents the minimum working power coefficient of the PEM electrolyzer, β is 0.05~0.1, P bat Represents the output power of the energy storage battery unit; If the relationship among the total wind and solar power generation power, the rated operating power of the ALK electrolyzer, the rated operating power of the PEM electrolyzer, the output power of the energy storage battery unit and the state of charge does not satisfy equation (6), or satisfies equation (6) but does not satisfy equations (7) and (8) in turn, then the ALK electrolyzer and the PEM electrolyzer are controlled to shut down.

9. The control system for hydrogen production based on wind-solar power generation and hybrid electrolysis according to claim 8 is characterized in that: When the state of charge in the energy storage battery unit satisfies the following formula, it means that the energy storage battery unit is not charged, otherwise, it means that the energy storage battery unit is charged. SOC=SOC max (9) In the formula, SOC represents the state of charge of the energy storage battery unit, SOC is 0.1~0.9, SOC max Represents the highest state of charge of the energy storage battery unit.

10. A control method for hydrogen production based on wind and solar power generation synergistic hybrid electrolysis, characterized in that: It includes the following: Compare the total wind-solar power input by the photovoltaic power generation unit and the wind power generation unit with the rated working power of the ALK electrolyzer and the rated working power of the PEM electrolyzer, and judge whether the wind-solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient through the comparison results; The working states of the ALK electrolyzer and the PEM electrolyzer are adjusted according to whether the wind and solar power of the photovoltaic power generation unit and the wind power generation unit are sufficient.

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