A control system and method for hydrogen production based on wind and solar power co-generation and hybrid electrolysis

Abstract

This invention discloses a control system and method for hydrogen production based on wind and solar power co-generation and hybrid electrolysis. The system compares the total power output from the photovoltaic and wind power generation units with the rated operating power of the ALK electrolyzer and the PEM electrolyzer, respectively. The comparison results determine whether the wind and solar power from the photovoltaic and wind power units is sufficient. Based on the sufficiency of the wind and solar power from the photovoltaic and wind power units, the operating states of the ALK and PEM electrolyzers are adjusted. This invention can ensure continuous operation of the ALK and PEM electrolyzers as much as possible, reduce downtime, achieve stable and efficient operation of the hybrid electrolyzer, and minimize wind and solar power curtailment in renewable energy power plants.

Description

Technical Field

[0001] This invention relates to the field of renewable energy hydrogen production technology, specifically to a control system and method for hydrogen production based on wind and solar power synergistic hybrid electrolysis. Background Technology

[0002] my country is vigorously promoting the construction of a new power system, and new energy power generation is developing rapidly. However, wind and solar power output is severely affected by seasons and weather, making it difficult to overcome the natural defects of intermittency, fluctuation, and randomness. Furthermore, the problem of wind and solar power curtailment caused by insufficient grid absorption capacity is also a major pain point for the large-scale development of wind and solar power.

[0003] Hydrogen energy is a secondary energy source that is abundant, green, low-carbon, widely applicable, and can serve as a medium for large-scale, long-term energy storage. Electrolysis of water to produce hydrogen utilizes wind and solar power to electrolyze water and produce green hydrogen. Simultaneously, the system can be equipped with a battery energy storage system to stabilize the system. This "wind and solar power + hydrogen production + energy storage" approach will promote the large-scale consumption of wind and solar power and the large-scale supply of green hydrogen, achieving cascaded energy utilization and improving energy efficiency.

[0004] Based on their working principles and electrolytes, water electrolysis for hydrogen production can be categorized into: alkaline water electrolysis (ALK), proton exchange membrane (PEM) water electrolysis, high-temperature solid oxide electrolysis (SOEC) water electrolysis, and solid polymer anion exchange membrane (AEM) water electrolysis. Currently, alkaline water electrolysis is the most mature technology, with relatively low cost, and has been fully commercialized. Most renewable energy hydrogen production projects currently utilize alkaline water electrolysis, but it suffers from slow response times and a narrow range of adaptability to power fluctuations. PEM water electrolysis is in its early commercialization stages and has higher costs, but it offers advantages such as fast response times and a wide range of adaptability to power fluctuations. SOEC and AEM technologies are still in the research and demonstration phase and have not yet been commercially applied in China.

[0005] To improve the utilization rate and hydrogen production capacity of wind and solar resources in wind-solar hybrid hydrogen production systems, and to address the problems associated with two types of electrolyzers (ALK and PEM), a hybrid ALK / PEM electrolyzer hydrogen production scheme can be considered. This scheme combines the lower-cost ALK electrolyzer with the more adaptable PEM electrolyzer to the fluctuations in wind and solar power, achieving low-cost, large-scale ALK water electrolysis for hydrogen production while improving the operational stability of the wind-solar hydrogen production system. However, current research on the operation and control of hybrid ALK / PEM electrolyzer hydrogen production systems is limited. How to achieve efficient hybrid operation of ALK and PEM, fully leverage their advantages, and realize the efficient utilization of renewable energy power is a pressing issue that needs to be addressed. Summary of the Invention

[0006] The purpose of this invention is to address the relatively limited research on the control of efficient mixed operation of ALK and PEM electrolyzers in existing technologies. Therefore, this invention proposes a control system and method for hydrogen production based on the synergistic co-generation of wind and solar power. This invention controls the operating states of the photovoltaic and wind power units, the alkaline electrolyzer, the proton exchange membrane electrolyzer, and the energy storage system by determining the total power output 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 this invention can ensure continuous operation of the ALK and PEM electrolyzers as much as possible, reduce the downtime of the ALK and PEM electrolyzers, achieve stable and efficient operation of the mixed electrolyzer, and minimize the curtailment of wind and electricity in new energy power plants.

[0007] To achieve this objective, the first aspect of the present invention provides a wind and solar power synergistic hybrid electrolysis hydrogen production control system, which includes a wind and solar power judgment module and an electrolyzer operation control module.

[0008] The wind and solar power judgment module compares the total wind and solar power input from the photovoltaic power generation unit and the wind power generation unit with the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer, respectively, and judges whether the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient based on the comparison results.

[0009] The electrolytic cell operation control module adjusts the operating status of the ALK electrolytic cell and the PEM electrolytic cell based on whether the wind and solar power input from the photovoltaic power generation unit and the wind power generation unit is sufficient.

[0010] Preferably, the specific method for comparing the total wind and solar power input from the photovoltaic power generation unit and the wind power generation unit with the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer, respectively, and determining whether the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient based on the comparison results is as follows:

[0011] When the total power of the wind and solar power generation and the rated operating power of the ALK electrolyzer satisfy equation (1), it is determined whether the total power of the wind and solar power generation, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer satisfy equation (2). If equation (2) is satisfied, it is further determined whether the total power of the wind and solar power generation, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer satisfy equation (3). If equation (3) is satisfied, it indicates that the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient; otherwise, it indicates that the wind and 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] In the formula, P WT+PV P represents the total power generated by wind and solar power. alk This represents the rated operating power of the ALK electrolyzer;

[0014] P WT+PV -P alk -βP pem ≥0 (2)

[0015] In the formula, P WT+PV P represents the total power generated by wind and solar power. alk P represents the rated operating power of the ALK electrolyzer. pem β 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] In the formula, P WT+PV P represents the total power generated by wind and solar power. alk P represents the rated operating power of the ALK electrolyzer. pem This represents the rated operating power of the PEM electrolyzer.

[0018] More preferably, the specific method for adjusting the operating status of the ALK electrolyzer and the PEM electrolyzer based on whether the wind and solar power input from the photovoltaic power generation unit and the wind power generation unit is sufficient is as follows:

[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 under rated load.

[0020] When the photovoltaic power generation unit and the wind power generation unit have insufficient wind and solar power, the relationship between the total wind and solar power generation and the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer is determined, and the operating status of the ALK electrolyzer and the PEM electrolyzer is adjusted according to the corresponding relationship.

[0021] More preferably, when the photovoltaic power generation unit and the wind power generation unit have insufficient wind and solar power, the specific method for further determining the relationship between the total wind and solar power generation power and the rated operating power of the ALK electrolyzer and the PEM electrolyzer, and adjusting the operating status of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship is as follows:

[0022] When judging equations (1), (2), and (3) in sequence, if equation (1) is satisfied but equation (2) is not satisfied, then the ALK electrolytic cell is controlled to operate under rated load, and the PEM electrolytic cell is controlled to shut down. If equations (1) and (2) are satisfied in sequence but equation (3) is not satisfied, then the ALK electrolytic cell is controlled to operate under rated load, and the PEM electrolytic cell is controlled to operate under βP. pem ~P pem Operating under load;

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

[0024] More preferably, when the relationship between the total wind and solar power generation and the rated operating power of the ALK electrolyzer does not satisfy equation (1), the specific method for further determining the relationship between the total wind and solar power generation and the rated operating power of the ALK electrolyzer, and adjusting the operating status of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship, is as follows:

[0025] When the total power generated by wind and solar power and the rated operating power of the ALK electrolyzer satisfy the following formula, the ALK electrolyzer is controlled at αP. alk ~P alk The system operates under load and controls the PEM electrolyzer to shut down; otherwise, it continues to determine the relationship between the total wind and solar power generation and the rated operating power of the PEM electrolyzer, and adjusts the operating status of the ALK electrolyzer and PEM electrolyzer accordingly.

[0026] P WT+PV ≥αP alk (4)

[0027] In the formula, P WT+PV P represents the total power generated by wind and solar power. alk α 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 and solar power generation and the rated operating power of the ALK electrolyzer does not satisfy equations (1) and (4) respectively, the specific method for further determining the relationship between the total wind and solar power generation and the rated operating power of the PEM electrolyzer, and adjusting the operating status of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship, is as follows:

[0029] When the total power generated by wind and solar power and the rated operating power of the PEM electrolyzer satisfy the following formula, the PEM electrolyzer is controlled at βP. pem ~P pem It operates under load and controls the shutdown of the ALK electrolytic cell.

[0030] P WT+PV ≥βP pem (5)

[0031] In the formula, P WT+PV P represents the total power generated by wind and solar power. pem β represents the rated operating power of the PEM electrolyzer, and β represents the minimum operating power coefficient of the PEM electrolyzer.

[0032] More preferably, the system further includes an energy storage battery unit. When the relationship between the total wind and solar power generation and the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer do not satisfy equations (1), (4), and (5) respectively, and the relationship between the total wind and solar power generation, the rated operating power of the ALK electrolyzer, the output power of the energy storage battery unit, and the state of charge successively satisfies equations (6) and (7), then the energy storage battery unit discharges to the ALK electrolyzer, causing the ALK electrolyzer to reach αP alk ~P alk The system operates under load and controls the PEM electrolyzer to shut down. Otherwise, it continues to determine the relationship between the total wind and solar power generation, the rated operating power of the PEM electrolyzer, and the output power of the energy storage battery unit, and adjusts the operating status of the ALK electrolyzer and 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 cell, with SOC ranging from 0.1 to 0.9. min This represents the lowest state of charge of the energy storage battery cell;

[0035] P WT+PV +P bat ≥αP alk (7)

[0036] In the formula, P WT+PV P represents the total power generated by wind and solar power. alk P represents the rated operating power of the ALK electrolyzer, α represents the minimum operating power coefficient of the ALK electrolyzer, and α is 0.25 to 0.5. bat This represents the output power of the energy storage battery unit.

[0037] More preferably, when the relationship between the total wind and solar power generation and the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer do not satisfy equations (1), (4), and (5) respectively, and the relationship between the total wind and solar power generation, the rated operating power of the ALK electrolyzer, the output power of the energy storage battery unit, and the state of charge satisfies equation (6) but not equation (7), then the total wind and solar power generation is compared with the rated operating 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, causing the PEM electrolyzer to reach βP pem ~P pem The system operates under load and controls the shutdown of the ALK electrolyzer:

[0038] P WT+PV +P bat ≥βP pem (8)

[0039] In the formula, P WT+PV P represents the total power generated by wind and solar power. pem P represents the rated operating power of the PEM electrolyzer, β represents the minimum operating power coefficient of the PEM electrolyzer, and β is 0.05 to 0.1. bat This represents the output power of the energy storage battery unit;

[0040] If the relationship between the total power of wind and solar power generation, 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 shall be shut down.

[0041] More preferably, when the state of charge in the energy storage battery cell satisfies the following formula, it indicates that the energy storage battery cell is not charging; otherwise, it indicates that the energy storage battery cell is charging.

[0042] SOC = SOC max (9)

[0043] In the formula, SOC represents the state of charge of the energy storage battery cell, with SOC ranging from 0.1 to 0.9. max This represents the highest state of charge of the energy storage battery cell.

[0044] The second aspect of this invention discloses a method for controlling hydrogen production based on synergistic hybrid electrolysis of wind and solar power generation, comprising the following:

[0045] The total wind and solar power input from the photovoltaic power generation unit and the wind power generation unit is compared with the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer, respectively. The comparison results are used to determine whether the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient.

[0046] The operating status of the ALK electrolytic cell and the PEM electrolytic cell is adjusted according to whether the wind and solar power generated by the photovoltaic power generation unit and the wind power generation unit is sufficient.

[0047] The beneficial effects of this invention are:

[0048] (1) This invention first compares the relationship between the total power of wind and solar power generation, the rated power of the ALK electrolyzer, and the rated power of the PEM electrolyzer to determine whether the wind and solar power is sufficient. 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 gradually becomes insufficient but has not reached the minimum point, the ALK electrolyzer is prioritized to operate, the energy storage battery is discharged, and the PEM electrolyzer operates at a low load or is shut down, minimizing the number of times the ALK electrolyzer is started and stopped. This is because the ALK electrolyzer starts up slower, while the PEM electrolyzer starts up faster. Reducing the number of times the ALK electrolyzer is started up can improve the continuity, stability and hydrogen production efficiency of the system. Until the wind and solar power reaches the minimum point, the PEM electrolyzer can take full advantage of operating at a lower load than the ALK electrolyzer, absorbing more wind and solar power and producing more hydrogen. At the same time, the number of times the hydrogen production system is shut down is reduced, ensuring the system can produce hydrogen stably to the maximum extent when the wind and solar power output is low.

[0049] (2) This invention fully utilizes the advantages of ALK electrolyzers (low cost and large scale) and PEM electrolyzers (fast start-up, fast response to wind and solar fluctuations, and wide adaptability to wind and solar fluctuations) to overcome the disadvantages of ALK electrolyzers (slow start-up, slow response to wind and solar fluctuations, narrow adaptability to wind and solar fluctuations) and PEM electrolyzers (high cost and small scale). It realizes large-scale consumption of wind and solar power, reduces the number of system start-ups and shutdowns, improves the continuity, stability and hydrogen production efficiency of system operation, and at the same time minimizes the curtailment of wind and solar power in new energy power plants. Attached Figure Description

[0050] Figure 1 This is a structural block diagram of a wind-solar power generation synergistic hybrid electrolysis hydrogen production control system according to one embodiment of the present invention;

[0051] Figure 2 This is a schematic diagram of a control method for hydrogen production based on wind and solar power synergistic electrolysis according to one embodiment of the present invention;

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

[0053] Figure 4 This is a schematic diagram of the process of the hydrogen production control method based on wind and solar power synergistic hybrid electrolysis in Embodiment 3 of the present invention. Detailed Implementation

[0054] The present invention will be 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 co-generation and hybrid electrolysis, such as Figure 1 As shown, it includes a wind and solar power judgment module and an electrolytic cell operation control module;

[0057] The wind and solar power judgment module compares the total wind and solar power input from the photovoltaic power generation unit and the wind power generation unit with the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer, respectively, and judges whether the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient based on the comparison results.

[0058] The electrolytic cell operation control module adjusts the operating status of the ALK electrolytic cell and the PEM electrolytic cell based on whether the wind and solar power input from 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 acquires the rated operating power, minimum operating power factor and state of charge of 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 specific method for comparing the total wind and solar power input from the photovoltaic power generation unit and the wind power generation unit with the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer, respectively, and determining whether the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient based on the comparison results is as follows:

[0061] When the total power of the wind and solar power generation and the rated operating power of the ALK electrolyzer satisfy equation (1), it is determined whether the total power of the wind and solar power generation, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer satisfy equation (2). If equation (2) is satisfied, it is further determined whether the total power of the wind and solar power generation, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer satisfy equation (3). If equation (3) is satisfied, it indicates that the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient; otherwise, it indicates that the wind and 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] In the formula, P WT+PV P represents the total power generated by wind and solar power. alk This represents the rated operating power of the ALK electrolyzer;

[0064] P WT+PV -P alk -βP pem ≥0 (2)

[0065] In the formula, P WT+PV P represents the total power generated by wind and solar power. alk P represents the rated operating power of the ALK electrolyzer. pem β 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] In the formula, P WT+PV P represents the total power generated by wind and solar power. alk P represents the rated operating power of the ALK electrolyzer. pem This 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 typically 0.05 to 0.1, and varies between different electrolyzer products.

[0068] In the above technical solution, the specific method for adjusting the working state of the ALK electrolyzer and the PEM electrolyzer based on whether the wind and solar power input from the photovoltaic power generation unit and the wind power generation unit is sufficient is as follows:

[0069] When the photovoltaic power generation unit and the wind power generation unit have sufficient wind and solar power, control the ALK electrolytic cell and the PEM electrolytic cell to operate under rated load.

[0070] When the photovoltaic power generation unit and the wind power generation unit have insufficient wind and solar power, the relationship between the total wind and solar power generation and the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer is determined, and the operating status of the ALK electrolyzer and the PEM electrolyzer is 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 specific method for further determining the relationship between the total wind and solar power generation power and the rated operating power of the ALK electrolyzer and the PEM electrolyzer, and adjusting the operating status of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship is as follows:

[0072] When the relationship between the total power of wind and 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), then the ALK electrolyzer is controlled to operate under rated load, and the PEM electrolyzer is controlled to shut down or operate at βP. pem ~P pem The total power of wind and solar power generation, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer are determined in this paper by judging the relationship between the total power of wind and solar power generation, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer in sequence. The purpose is to make full use of solar and wind energy, reduce wind and solar curtailment, 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 power of wind and solar power generation, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer is: if equation (1) is satisfied and equation (2) is not satisfied, the ALK electrolyzer is controlled to operate under the rated load and the PEM electrolyzer is controlled to shut down. If equations (1) and (2) are satisfied and equation (3) is not satisfied, the ALK electrolyzer is controlled to operate under the rated load and the PEM electrolyzer is controlled to operate under βP. pem ~P pem It operates under load; in this article, shutdown refers to its input power being 0 and stopping operation.

[0073] When the relationship between the total power of wind and solar power generation and the rated operating power of the ALK electrolyzer does not satisfy equation (1), the relationship between the total power of wind and solar power generation and the rated operating power of the ALK electrolyzer is further determined, and the operating status of the ALK electrolyzer and the PEM electrolyzer is adjusted according to the corresponding relationship.

[0074] In the above technical solution, when the relationship between the total power of wind and solar power generation and the rated operating power of the ALK electrolyzer does not satisfy equation (1), the specific method for further determining the relationship between the total power of wind and solar power generation and the rated operating power of the ALK electrolyzer, and adjusting the operating status of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship, is as follows:

[0075] When the total power of wind and solar power generation and the rated operating power of the ALK electrolyzer satisfy the following formula, that is, when the total power of wind and solar power generation and the rated operating power of the ALK electrolyzer do not satisfy formula (1) but satisfy formula (4), then the ALK electrolyzer is controlled at αP alk ~P alk The system operates under load and controls the PEM electrolyzer to shut down; otherwise, it continues to determine the relationship between the total wind and solar power generation and the rated operating power of the PEM electrolyzer, and adjusts the operating status of the ALK electrolyzer and PEM electrolyzer according to the corresponding relationship.

[0076] P WT+PV ≥αP alk (4)

[0077] In the formula, P WT+PV P represents the total power generated by wind and solar power. alk The rated operating power of the ALK electrolyzer is represented by α, which represents the minimum operating power factor of the ALK electrolyzer. In this article, α is the minimum operating power factor of the alkaline electrolyzer, which is typically 0.25 to 0.5, but varies between different electrolyzer products.

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

[0079] When the total power of wind and solar power generation and the rated operating power of the PEM electrolyzer satisfy the following formula, that is, when the total power of wind and 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) and (4) but satisfy formula (5), then the PEM electrolyzer is controlled at βP pem ~P pem It operates under load and controls the shutdown of the ALK electrolytic cell.

[0080] P WT+PV ≥βP pem (5)

[0081] In the formula, P WT+PV P represents the total power generated by wind and solar power. pemβ represents the rated operating power of the PEM electrolyzer, and β represents the minimum operating power coefficient of the PEM electrolyzer.

[0082] In this paper, when the relationship between the total power of wind and solar power generation, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer satisfies the following four conditions: satisfying equation (1) but not equation (2), satisfying equation (1)(2) but not equation (3), not satisfying equation (1) but satisfying equation (4), and not satisfying equation (1)(4) but satisfying equation (5), the power generated by wind and solar power generation is insufficient, but it can maintain the ALK electrolyzer or PEM electrolyzer operating under low load. Therefore, it is not necessary 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 power of wind and solar power generation and the rated operating power of the PEM electrolyzer do not satisfy equation (5), that is, simultaneously do not satisfy equations (1), (4), and (5), and the total power of wind and solar power generation, the rated operating power of the ALK electrolyzer, the output power of the energy storage battery unit, and the state of charge simultaneously satisfy the following formula, the energy storage battery unit is controlled to discharge to the ALK electrolyzer, so that the ALK electrolyzer is in αP alk ~P alk The system operates under load and controls the PEM electrolyzer to shut down. Otherwise, it continues to determine the relationship between the total wind and solar power generation, the rated operating power of the PEM electrolyzer, and the output power of the energy storage battery unit, and adjusts the operating status of the ALK electrolyzer and 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 cell, which is numerically defined as the ratio of remaining capacity to battery capacity, typically ranging from 0.1 to 0.9; min Represents the lowest state of charge (SOC) of an energy storage battery cell; typically, SOC is... min It can be 0.1, which means that the energy storage battery unit still has 0.1 times the total capacity of electrical energy storage remaining;

[0086] P WT+PV +P bat ≥αP alk (7)

[0087] In the formula, P WT+PV P represents the total power generated by wind and solar power. alk P represents the rated operating power of the ALK electrolyzer, α represents the minimum operating power factor of the ALK electrolyzer, and P bat This represents the output power of the energy storage battery unit, indicating its ability to discharge and perform work.

[0088] In the above technical solution, when the total power of wind and solar power generation, the rated operating power of the ALK electrolyzer, the output power of the energy storage battery unit, and the state of charge satisfy equation (6) but not equation (7), the total power of wind and solar power generation is compared with the rated operating 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 is controlled to discharge, so that the PEM electrolyzer is in βP pem ~P pem The system operates under load and controls the shutdown of the ALK electrolyzer:

[0089] P WT+PV +P bat ≥βP pem (8)

[0090] In the formula, P WT+PV P represents the total power generated by wind and solar power. pem P represents the rated operating power of the PEM electrolyzer, β represents the minimum operating power factor of the PEM electrolyzer, and P bat This represents the output power of the energy storage battery unit;

[0091] In the above technical solution, if the relationship between the total power of wind and solar power generation, 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), then the ALK electrolyzer and the PEM electrolyzer will be shut down.

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

[0093] SOC = SOC max (9)

[0094] In the formula, SOC max This represents the highest state of charge (SOC) of the energy storage battery cell. Typically, the highest SOC can be 0.9, meaning that the energy storage battery still has 0.9 times its total capacity of electrical energy stored.

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

[0096] Example 2

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

[0098] The total wind and solar power input from the photovoltaic power generation unit and the wind power generation unit is compared with the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer, respectively. The comparison results are used to determine whether the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient.

[0099] The operating status of the ALK electrolytic cell and the PEM electrolytic cell is adjusted according to whether the wind and solar power generated by the photovoltaic power generation unit and the wind power generation unit is sufficient.

[0100] In this paper, when the total power of wind and solar power generation, 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 and solar power generation of the photovoltaic power generation unit and the wind power generation unit are sufficient. Under the condition of sufficient wind and solar power, 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 operate at rated load, the energy storage battery units do not charge, and the remaining electricity is discarded: 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 operate at rated load, the energy storage battery units are charged, and the remaining electricity is discarded: 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 indicates insufficient wind and solar power from the photovoltaic power generation unit and the wind power generation unit. In this paper, when the relationship between the total wind and 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 operation of the electrolyzer and the energy storage battery unit under this condition 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 does not charge: 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 electrolytic cell operates at its rated load, the PEM electrolytic cell shuts down, the energy storage battery unit is not charged, and the remaining electricity is wasted: 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 electrolytic cell operates at its rated load, the PEM electrolytic cell shuts down, the energy storage battery unit is charged, and the remaining electricity is discarded: P WT+PV -P alk ≥0; P WT+PV -P alk -βP pem <0; SOC < SOC max .

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

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

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

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

[0111] In this paper, when the relationship between the total power of wind and solar power generation, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer does not satisfy equations (1), (4), or (5), the energy storage battery unit needs to discharge to the electrolyzer. Specifically, when the state of charge of the energy storage battery unit satisfies equation (6), the energy storage battery unit is determined to be in a discharging state. Under this condition, 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 cell discharges, and the ALK electrolytic cell discharges at αP alk Operational, 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 cell discharges, and the PEM electrolytic cell discharges at βP pem Operational, ALK electrolyzer shut down: 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 paper, both the ALK and PEM electrolyzers are shut down. Under these conditions, the operation of the electrolyzers and the energy storage battery units 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 electricity will be wasted: 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 will be shut down, the energy storage battery units will be charged, and the remaining electricity will be discarded: 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 will be shut down, the energy storage battery units will be charged, and the remaining electricity will be discarded: 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, such as Figure 4 As shown, based on the total wind and solar power output P of the input system... WT+PV and the rated operating power P of the alkaline electrolytic cell alk The rated operating power P of the PEM electrolyzer pemThe parameters include the output power (Pbat) of the energy storage battery unit, the state of charge (SOC) of the energy storage battery unit, and other indicators. Based on the parameters of existing ALK and PEM electrolyzer products and the performance parameters of energy storage battery units on the market, it is assumed that the minimum operating power coefficient α = 0.3 for alkaline electrolyzers, the minimum operating power coefficient β = 0.1 for PEM electrolyzers, and the SOC... max =0.9 and SOC min =0.1, implement the following controls:

[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, energy storage battery units are not charged, and remaining electricity is wasted;

[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 remaining electricity is discarded;

[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 The system is running, but the energy storage battery unit is not charging.

[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 remaining power is wasted;

[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 remaining electricity is discarded;

[0125] (6)P WT+PV -P alk <0; P WT+PV ≥0.3P alk ALK electrolytic cell with 30% P alk When running, the PEM electrolyzer stops operating, and the energy storage battery unit does not charge;

[0126] (7)P WT+PV -P alk <0; P WT+PV <0.3P alk ;P WT+PV ≥0.1P pem The ALK electrolytic cell was shut down, and the PEM electrolytic cell operated at 10% P. pem The system is running, but the energy storage battery unit is not charging.

[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 cell discharge, ALK electrolyzer with 30% P alk Operation is complete, but the PEM electrolyzer is 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 The energy storage battery cell discharges, and the PEM electrolyzer uses 10% P... pem Operation is complete; the ALK electrolytic cell is 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, energy storage battery units are not charged, and remaining electricity is wasted.

[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, energy storage battery units are charged, and remaining electricity is discarded.

[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, energy storage battery units are charged, and remaining electricity is discarded.

[0132] This invention proposes a control system and method for hydrogen production based on wind and solar power co-generation and hybrid electrolysis. It fully utilizes the advantages of ALK electrolyzers (low cost and large scale) and PEM electrolyzers (fast start-up, fast response to wind and solar power fluctuations, and wide adaptability to wind and solar power fluctuations), while overcoming the disadvantages of ALK electrolyzers (slow start-up, slow response to wind and solar power fluctuations, and narrow adaptability to wind and solar power fluctuations) and PEM electrolyzers (high cost and small scale). This invention enables large-scale utilization of wind and solar power, reduces the number of system start-ups and shutdowns, and improves the continuity, stability, and hydrogen production efficiency of the system.

[0133] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A control system for hydrogen production based on wind and solar power co-generation and hybrid electrolysis, characterized in that: It includes a wind and solar power assessment module and an electrolytic cell operation control module; The wind and solar power judgment module compares the total wind and solar power input from the photovoltaic power generation unit and the wind power generation unit with the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer, respectively, and judges whether the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient based on the comparison results. The electrolytic cell operation control module adjusts the working status of the ALK electrolytic cell and the PEM electrolytic cell according to whether the wind and solar power input from the photovoltaic power generation unit and the wind power generation unit is sufficient; When the total power of the wind and solar power generation and the rated operating power of the ALK electrolyzer satisfy equation (1), it is determined whether the total power of the wind and solar power generation, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer satisfy equation (2). If equation (2) is satisfied, it is further determined whether the total power of the wind and solar power generation, the rated operating power of the ALK electrolyzer, and the rated operating power of the PEM electrolyzer satisfy equation (3). If equation (3) is satisfied, it indicates that the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient; otherwise, it indicates that the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is insufficient. P WT+PV -P alk ≥0 (1) In the formula, P WT+PV P represents the total power generated by wind and solar power. alk This represents the rated operating power of the ALK electrolytic cell; P WT+PV -P alk -βP pem ≥0 (2) In the formula, P WT+PV P represents the total power generated by wind and solar power. alk P represents the rated operating power of the ALK electrolyzer. pem β represents the rated operating power of the PEM electrolyzer, and β represents the minimum operating power coefficient of the PEM electrolyzer, with β ranging from 0.05 to 0.

1. P WT+PV -P alk- P pem ≥0 (3) In the formula, P WT+PV P represents the total power generated by wind and solar power. alk P represents the rated operating power of the ALK electrolyzer. pem This represents the rated operating power of the PEM electrolyzer; When judging equations (1), (2), and (3) in sequence, if equation (1) is satisfied but equation (2) is not satisfied, then the ALK electrolytic cell is controlled to operate under rated load, and the PEM electrolytic cell is controlled to shut down. If equations (1) and (2) are satisfied in sequence but equation (3) is not satisfied, then the ALK electrolytic cell is controlled to operate under rated load, and the PEM electrolytic cell is controlled to operate under βP. pem ~P pem Operating under load; When the relationship between the total power of wind and solar power generation and the rated operating power of the ALK electrolyzer does not satisfy equation (1), the relationship between the total power of wind and solar power generation and the rated operating power of the ALK electrolyzer is further determined, and the operating status of the ALK electrolyzer and the PEM electrolyzer is adjusted according to the corresponding relationship. When the total power generated by wind and solar power and the rated operating power of the ALK electrolyzer satisfy the following formula, the ALK electrolyzer is controlled at αP. alk ~P alk The system operates under load and controls the PEM electrolyzer to shut down; otherwise, it continues to determine the relationship between the total wind and solar power generation and the rated operating power of the PEM electrolyzer, and adjusts the operating status of the ALK electrolyzer and PEM electrolyzer accordingly. P WT+PV ≥αP alk (4) In the formula, P WT+PV P represents the total power generated by wind and solar power. alk The rated operating power of the ALK electrolyzer is represented by α, which represents the minimum operating power coefficient of the ALK electrolyzer, and α is 0.25 to 0.

5.

2. The control system for hydrogen production based on wind and solar power synergistic hybrid electrolysis according to claim 1, characterized in that: The specific method for adjusting the operating status of the ALK electrolyzer and PEM electrolyzer based on whether the input wind and solar power from 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 under rated load. When the photovoltaic power generation unit and the wind power generation unit have insufficient wind and solar power, the relationship between the total wind and solar power generation and the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer is determined, and the operating status of the ALK electrolyzer and the PEM electrolyzer is adjusted according to the corresponding relationship.

3. The control system for hydrogen production based on wind and solar power synergistic hybrid electrolysis according to claim 1, characterized in that: When the relationship between the total power of wind and solar power generation and the rated operating power of the ALK electrolyzer does not satisfy equations (1) and (4) respectively, the specific method for further determining the relationship between the total power of wind and solar power generation and the rated operating power of the PEM electrolyzer, and adjusting the operating status of the ALK electrolyzer and the PEM electrolyzer according to the corresponding relationship is as follows: When the total power generated by wind and solar power and the rated operating power of the PEM electrolyzer satisfy the following formula, the PEM electrolyzer is controlled at βP. pem ~P pem It operates under load and controls the shutdown of the ALK electrolytic cell. P WT+PV ≥βP pem (5) In the formula, P WT+PV P represents the total power generated by wind and solar power. pem β represents the rated operating power of the PEM electrolyzer, and β represents the minimum operating power coefficient of the PEM electrolyzer.

4. The control system for hydrogen production based on wind and solar power synergistic hybrid electrolysis according to claim 3, characterized in that: The system also includes an energy storage battery unit. When the relationship between the total wind and solar power generation and the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer do not satisfy equations (1), (4), and (5) respectively, and the relationship between the total wind and solar power generation, the rated operating power of the ALK electrolyzer, the output power of the energy storage battery unit, and the state of charge successively satisfies equations (6) and (7), then the energy storage battery unit discharges into the ALK electrolyzer, causing the ALK electrolyzer to reach αP alk ~P alk The system operates under load and controls the PEM electrolyzer to shut down. Otherwise, it continues to determine the relationship between the total wind and solar power generation, the rated operating power of the PEM electrolyzer, and the output power of the energy storage battery unit, and adjusts the operating status of the ALK electrolyzer and 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 cell, with SOC ranging from 0.1 to 0.

9. min Represents the lowest state of charge of an energy storage battery cell. P WT+PV +P bat ≥αP alk (7) In the formula, P WT+PV P represents the total power generated by wind and solar power. alk P represents the rated operating power of the ALK electrolyzer, α represents the minimum operating power coefficient of the ALK electrolyzer, and α is 0.25 to 0.

5. bat This represents the output power of the energy storage battery unit.

5. The control system for hydrogen production based on wind and solar power synergistic electrolysis as described in claim 4, characterized in that: When the relationship between the total wind and solar power generation and the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer does not satisfy equations (1), (4), and (5) respectively, and the relationship between the total wind and solar power generation, the rated operating power of the ALK electrolyzer, the output power of the energy storage battery unit, and the state of charge satisfies equation (6) but not equation (7), then the total wind and solar power generation is compared with the rated operating 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, causing the PEM electrolyzer to reach βP pem ~P pem The system operates under load and controls the shutdown of the ALK electrolyzer: P WT+PV +P bat ≥βP pem (8) In the formula, P WT+PV P represents the total power generated by wind and solar power. pem P represents the rated operating power of the PEM electrolyzer, β represents the minimum operating power coefficient of the PEM electrolyzer, and β is 0.05 to 0.

1. bat This represents the output power of the energy storage battery unit; If the relationship between the total power of wind and solar power generation, 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 shall be shut down.

6. The control system for hydrogen production based on wind and solar power synergistic hybrid electrolysis according to claim 5, characterized in that: When the state of charge in the energy storage battery cell satisfies the following formula, it indicates that the energy storage battery cell is not charging; otherwise, it indicates that the energy storage battery cell is charging. SOC=SOC max (9) In the formula, SOC represents the state of charge of the energy storage battery cell, with SOC ranging from 0.1 to 0.

9. max This represents the highest state of charge of the energy storage battery cell.

7. A control method for a wind-solar power generation synergistic hybrid electrolysis hydrogen production control system as described in claim 1, characterized in that: It includes the following: The total wind and solar power input from the photovoltaic power generation unit and the wind power generation unit is compared with the rated operating power of the ALK electrolyzer and the rated operating power of the PEM electrolyzer, respectively. The comparison results are used to determine whether the wind and solar power of the photovoltaic power generation unit and the wind power generation unit is sufficient. The operating status of the ALK electrolytic cell and the PEM electrolytic cell is adjusted according to whether the wind and solar power generated by the photovoltaic power generation unit and the wind power generation unit is sufficient.

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