A hydrogen production power supply system, a control method, a medium, and a control system

Abstract

The application discloses a hydrogen production power supply system, a control method, a medium and a control system. The hydrogen production power supply system comprises multiple power units and multiple electrolytic cells. Each power unit comprises an AC / DC module and a DC / DC module. The input ends of the AC / DC modules are connected with a power grid. The output ends of the AC / DC modules are connected with each other to form an intermediate DC loop. The input ends of the DC / DC modules are connected with the intermediate DC loop. The output ends of the DC / DC modules are connected with the electrolytic cells one by one. The control method comprises the following steps: 1) obtaining state information of the hydrogen production power supply system; and 2) distributing the power of the AC / DC modules according to the state information of the hydrogen production power supply system so that as many AC / DC modules as possible work in an optimal efficiency range, and distributing the power of the DC / DC modules to meet the demand power of the electrolytic cells. The application has the advantages of ensuring the system operation efficiency and the like.

Description

Technical Field

[0001] This invention mainly relates to the field of hydrogen production technology, specifically to a hydrogen production power supply system, control method, medium, and control system. Background Technology

[0002] Hydrogen energy is a widely available, green, and efficient secondary energy source, playing an increasingly important role in the new energy field. Hydrogen production is the primary technological step in the utilization of hydrogen energy. Currently, most commercially available water electrolysis hydrogen production technologies adopt grid rectification hydrogen production schemes, that is, directly using grid electricity, converting it through AC / DC conversion, and then supplying it to the hydrogen production cell through DC / DC conversion.

[0003] Typically, a standalone hydrogen production power supply cabinet consists of one AC / DC circuit, followed by a series DC / DC circuit, as shown in the example below. Figure 1 As shown. The patent applicant has discovered the following problems when using the above-mentioned hydrogen production power source: 1. When an electrolyzer connected to an independent hydrogen production power source malfunctions or is under maintenance, the entire AC / DC rectification circuit and DC / DC chopper circuit are disconnected. However, in reality, only the DC / DC circuit needs to be disconnected to stop power supply to the electrolyzer; shutting it all down would result in wasted AC / DC circuit equipment.

[0004] 2. When the hydrogen production demand of a certain electrolyzer decreases, the power of the corresponding DC / DC rectifier stage will generally be reduced. The input efficiency of the AC / DC stage will also decrease accordingly. When the power of the AC / DC stage drops below 70%, its efficiency will decrease rapidly, as explained below: The efficiency of the AC / DC rectifier reaches its maximum when it operates at 70%–80% of the rated power. This value varies depending on the power rating of the power supply and can be measured experimentally at different power points, but it is generally around 70%. Below this value, the efficiency of the AC / DC stage will decrease rapidly. Therefore, it is necessary to operate the AC / DC stage at a power level above the 70% optimal efficiency point to prevent a rapid decrease in efficiency. Figure 2 As shown, taking the efficiency curve of the AC / DC stage of a hydrogen production power supply as an example, its efficiency = output power / (output power + cabinet loss). The cabinet loss includes primary losses such as copper busbars, reactors, IGBTs, etc., as well as secondary auxiliary power supply losses. Therefore, the efficiency will be different when the output power is different. It is not that the efficiency is highest when the output power is the maximum.

[0005] 3. If a certain AC / DC circuit fails, the corresponding DC / DC circuit and electrolytic cell will stop working and cause losses. Summary of the Invention

[0006] The technical problem to be solved by this invention is: in view of the technical problems existing in the prior art, this invention provides a hydrogen production power system, control method, medium and control system that ensures the overall efficiency of the system.

[0007] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows: A hydrogen production power system includes multiple power units and multiple electrolyzers. Each power unit includes an AC / DC module and a DC / DC module. The input terminal of the AC / DC module of each power unit is connected to the power grid. The output terminals of each AC / DC module are interconnected to form an intermediate DC circuit. The input terminal of each DC / DC module is connected to the intermediate DC circuit. The output terminal of each DC / DC module is connected to an electrolyzer in a corresponding manner.

[0008] Preferably, the AC / DC converter is a rectifier circuit composed of fully controllable components; the DC / DC module is a chopper circuit composed of fully controllable components.

[0009] The present invention also discloses a control method based on the hydrogen production power system described above, comprising the following steps: 1) Obtain the status information of the hydrogen production power system, including fault information of each AC / DC module, DC / DC module and electrolyzer, rated power of each normal AC / DC module and required power of each normal electrolyzer; 2) Allocate the power of the AC / DC modules according to the status information of the hydrogen production power system so that as many AC / DC modules as possible operate within the optimal efficiency range, while allocating the power of the DC / DC modules to meet the power requirements of the electrolyzer.

[0010] Preferably, in step 1), the power of each normal AC / DC module at its optimal efficiency point is added together to obtain the total power Pr_all, and the required power of each normal electrolytic cell is added together to obtain the total required power Pc_all; In step 2), the total power Pr_all is compared with the total demand power Pc_all; when the total demand power Pc_all is greater than the total power Pr_all, the difference between the two is calculated as Pc_all-Pr_all, and the power corresponding to the difference is allocated to some AC / DC modules, while other AC / DC modules operate at their optimal efficiency point, and all normal DC / DC modules control the electrolytic cell to operate at its rated power. When the total power demand Pc_all is less than the total power Pr_all, the power of one AC / DC module is reduced, while the other normal AC / DC modules operate at their optimal efficiency point; all normal DC / DC modules control the electrolytic cell to operate at its rated power.

[0011] Preferably, in step 1), when one or more AC / DC modules fail, the rated power of each normal AC / DC module is added together to obtain the total rated power Pr_max, and the required power of each electrolytic cell is added together to obtain the total required power Pc_all. In step 2), the total rated power Pr_max is compared with the total demand power Pc_all; when the total rated power Pr_max is less than the total demand power Pc_all, all normal AC / DC modules operate at rated power, while the power of the DC / DC module corresponding to the faulty AC / DC module is reduced, and other DC / DC modules control the electrolytic cell to operate at rated power. When the total rated power Pr_max is greater than the total demand power Pc_all, the total power Pr_all is compared with the total demand power Pc_all; when the total demand power Pc_all is greater than the total power Pr_all, the difference between the two is calculated as Pc_all-Pr_all, and the power corresponding to the difference is allocated to some AC / DC modules, while other AC / DC modules operate at their optimal efficiency point, and all normal DC / DC modules control the electrolytic cell to operate at its rated power. When the total demand power Pc_all is less than the total power Pr_all, the power of one AC / DC module is reduced to make the total demand power Pc_all equal to the total power Pr_all, and all other AC / DC modules operate at their optimal efficiency point; all normal DC / DC modules control the electrolytic cell to operate at its rated power.

[0012] Preferably, in step 1), when the AC / DC module is not faulty, but one or more DC / DC modules or electrolytic cells are faulty, the power of each normal AC / DC module at its optimal efficiency point is added together to obtain the total power Pr_all, and the required power of each normal electrolytic cell is added together to obtain the total required power Pc_all. In step 2), the total power Pr_all is compared with the total demand power Pc_all; when the total demand power Pc_all is greater than the total power Pr_all, the difference between the two is calculated as Pc_all-Pr_all, and the power corresponding to the difference is allocated to some AC / DC modules, while other AC / DC modules operate at their optimal efficiency point, and all normal DC / DC modules control the electrolytic cell to operate at its rated power. When the total demand power Pc_all is less than the total power Pr_all, the power of one AC / DC module is reduced to make the total demand power Pc_all equal to the total power Pr_all, and all other AC / DC modules operate at their optimal efficiency point; all normal DC / DC modules control the electrolytic cell to operate at its rated power.

[0013] Preferably, the specific process of allocating the power corresponding to the difference to part of the AC / DC modules is: if Pc_all-Pr_all<Pr1-P1, allocate the excess power to the AC / DC module of the P1 branch, and all the remaining n-1 AC / DC modules operate at the optimal efficiency point power; if Pr1-P1<Pc_all-Pr_all<(Pr1-P1)+(Pr2-P2), allocate the excess power to the AC / DC modules of the P1 and P2 branches, and all the remaining n-2 AC / DC modules operate at the optimal efficiency point power; the powers corresponding to all AC / DC modules when located at the optimal efficiency point are sorted in descending order as P1, P2...Pn; the rest can be deduced by analogy until the excess power is completely allocated, and all remaining AC / DC modules operate at the optimal efficiency point.

[0014] Preferably, when the total required power Pc_all is less than the total power Pr_all, reduce the power of the AC / DC module in the P1 branch so that the total required power Pc_all is equal to the total power Pr_all, wherein the power of the AC / DC module in the P1 branch is P1-(Pr_all-Pc_all).

[0015] The present invention also discloses a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, performs the steps of the method described above.

[0016] The present invention further discloses a control system for a hydrogen production power supply system, comprising a memory and a processor connected to each other, wherein a computer program is stored on the memory, and the computer program, when executed by the processor, performs the steps of the method described above.

[0017] Compared with the prior art, the advantages of the present invention are: In the hydrogen production power supply system of the present invention, the intermediate DC links of each power branch are electrically connected to form an intermediate DC circuit; when an electrolytic cell is cut off, the corresponding AC / DC link is not cut off, but instead supplies power to the DC / DC modules of other power branches, avoiding the waste caused by shutdown of the AC / DC link; at the same time, the extra AC / DC module can also be used to reduce the power that other AC / DC modules need to bear, so that as many AC / DC modules as possible operate at the maximum efficiency point, ensuring the overall operation efficiency of the system.

[0018] This invention ensures that when an electrolyzer malfunctions or is under maintenance, the AC / DC modules of the faulty branch do not shut down. By distributing the total power demand of the normal electrolyzers to all AC / DC modules, the AC / DC modules in the faulty branch remain operational, with the maximum number of AC / DC modules reaching their maximum efficiency power, thus guaranteeing the overall system efficiency. Similarly, when the hydrogen production demand of an electrolyzer decreases, this invention also ensures that the maximum number of AC / DC modules reach their maximum efficiency power, guaranteeing the overall system efficiency. Furthermore, when an AC / DC module in a hydrogen production power source fails, this invention does not disconnect the corresponding power branch's DC / DC modules and electrolyzers. Power is supplied through other power branches, and this also ensures that the maximum number of AC / DC modules reach their maximum efficiency power, guaranteeing the overall system efficiency. Attached Figure Description

[0019] Figure 1 This is a topology diagram of a current hydrogen production power system.

[0020] Figure 2 This is an efficiency-load percentage curve for the AC / DC module.

[0021] Figure 3 This is a topology diagram of the hydrogen production power system of the present invention in an embodiment.

[0022] Figure 4 This is a flowchart of the control method of the present invention in an embodiment.

[0023] Figure 5 This is a flowchart of the control method of the present invention in a specific application. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 3 As shown, the hydrogen production power system provided in this embodiment of the invention includes multiple power units (or power branches) and multiple electrolyzers. Each power unit includes an AC / DC module and a DC / DC module. The input terminal of the AC / DC module of each power unit is connected to the power grid. The output terminals of each AC / DC module are interconnected to form an intermediate DC circuit. The input terminal of each DC / DC module is connected to the intermediate DC circuit. The output terminal of each DC / DC module is connected to the electrolyzer in a corresponding manner.

[0026] Specifically, such as Figure 3As shown, there are n power branches, where the AC / DC converters are rectifier circuits composed of fully controllable devices, allowing control over their power output. Power is drawn from the AC grid and rectified into intermediate DC. The n AC / DC converters can have the same power rating or different power ratings.

[0027] The intermediate DC circuit connects the output side of the AC / DC converter and the input side of the DC / DC converter of the n branches, as well as the intermediate DC bus of different branches.

[0028] The DC / DC module is a chopper circuit composed of fully controllable components, which can control its power output. It chops the intermediate DC current into the voltage and current corresponding to the power required by the electrolytic cell (the electrolytic cell specifications can be the same or different).

[0029] The control unit can receive fault messages from each AC / DC converter, DC / DC converter, and electrolytic cell via communication, and can also input the required power value for each electrolytic cell.

[0030] The hydrogen production power system of the present invention connects the intermediate DC links of each power branch to form an intermediate DC circuit. When a certain electrolyzer is cut off, the corresponding AC / DC link is not cut off, but instead supplies power to the DC / DC modules of other power branches, avoiding the waste of AC / DC link downtime. At the same time, the extra AC / DC module can be used to reduce the power required by other AC / DC modules (originally all AC / DC modules were running at 100% rated power), allowing as many AC / DC modules as possible to run at their maximum efficiency point (such as 70% of rated power).

[0031] Furthermore, in the original topology, when there was no parallel connection between the cabinets, if the AC / DC link failed, the corresponding DC / DC link and the electrolytic cell would shut down and become inoperable. Now, with the intermediate DC links of each power branch electrically connected to form an intermediate DC loop, it can be powered by other AC / DC modules. The extra power provided by each AC / DC module is allocated to allow as many AC / DC modules as possible to operate at 70% of their maximum efficiency. Of course, this is on the premise that the maximum total power of all other AC / DC modules can withstand the extra power of the electrolytic cell; if it cannot, then the electrolytic cell cannot operate at full power and should operate within the limit of its maximum input power.

[0032] like Figure 4 As shown, the present invention also discloses a control method based on the hydrogen production power system described above, comprising the following steps: 1) Obtain the status information of the hydrogen production power system, including fault information of each AC / DC module, DC / DC module and electrolyzer, rated power of each normal AC / DC module and required power of each normal electrolyzer; 2) Allocate the power of the AC / DC modules according to the status information of the hydrogen production power system so that as many AC / DC modules as possible operate within the optimal efficiency range, while allocating the power of the DC / DC modules to meet the power requirements of the electrolyzer.

[0033] Specifically, when a certain electrolyzer malfunctions or is under maintenance, or when the DC / DC module is damaged, or when the required hydrogen production power of the electrolyzer changes, the operation of its corresponding AC / DC module is not stopped. The power allocation value is calculated to ensure that the most AC / DC modules operate at the power point corresponding to the optimal efficiency value.

[0034] When a certain AC / DC module fails, the operation of its corresponding DC / DC module and electrolyzer is not stopped. Charging is supported by AC / DC modules from other circuits. At the same time, the power allocation value can be calculated to ensure that the maximum number of AC / DC modules operate at the power point corresponding to the optimal efficiency value. Furthermore, if the rated total power of all AC / DC modules is less than the total power demand of all electrolyzers, the power of the DC / DC module in the faulty circuit is reduced to control the hydrogen production of the corresponding electrolyzer.

[0035] The present invention will be further described below with reference to a complete specific embodiment: Let the rated power of the AC / DC module on the x-th power branch be Prx, then the total rated power of all AC / DC links is: Pr_max = Pr1 + Pr2 + ... + Prn The maximum efficiency point is achieved at 70% of Prx, meaning the power point corresponding to the optimal efficiency point is Px = Prx * 0.7. Arranging Px in descending order as P1, P2...Pn, the total power corresponding to all AC / DC modules being at their optimal efficiency points is: Pr_all = P1 + P2 + ... + Pn The power requirement of the electrolytic cells on the xth power branch can be set as Pcx. Then the total power requirement of all electrolytic cells is: Pc_all = Pc1 + Pc2 + ... + Pcn like Figure 5 As shown, when the hydrogen production power system starts working, the initial power value required by each electrolyzer is input to the control unit. If the hydrogen production changes and the required power changes, it needs to be re-entered; if it remains unchanged, it does not need to be re-entered. determining whether there is a faulty AC / DC module; if yes, it indicates that the number of AC / DC modules is less than that of DC / DC modules at this time, calculating the total demanded power Pc_all of all electrolytic cells in n power branches, and calculating the total rated power Pr_max of AC / DC modules obtained by removing the faulty power branch from the n power branches; then comparing the total rated power Pr_max with the total demanded power Pc_all; if Pr_max is less than Pc_all, it indicates that the total rated power Pr_max of all AC / DC modules cannot meet the total demanded power Pc_all of all electrolytic cells, controlling non-faulty AC / DC modules to operate at rated power at this time, reducing the power of the DC / DC module corresponding to the faulty branch to (Pr_max - the sum of rated powers of DC / DC modules in non-faulty branches), and controlling the electrolytic cells corresponding to DC / DC modules in other normal power branches to operate at rated voltage, rated current and rated power.

[0036] if Pr_max is greater than Pc_all, further comparing the total power Pr_all with the total demanded power Pc_all of the electrolytic cells; if Pr_all is greater than Pc_all, it indicates that when all AC / DC modules operate at the optimal operating point, the total power thereof is greater than the power required by the electrolytic cells, so the power of a certain AC / DC module must be reduced to equalize the input power and output power. Therefore, all normal AC / DC modules except those on the P1 branch operate at the optimal efficiency point power, and the power output by the AC / DC module on the P1 branch is P1-(Pr_all-Pc_all). All non-faulty DC / DC modules control the corresponding electrolytic cells to operate under the rated voltage, rated current and rated power, so as to ensure sufficient hydrogen production; when Pr_all is not greater than Pc_all, a further comparison is performed: if Pc_all-Pr_all < Pr1-P1, it indicates that the extra power only needs to be distributed to the AC / DC module of the P1 branch, and all the remaining n-1 AC / DC modules operate at the optimal efficiency point power.

[0037] if Pc_all-Pr_all > Pr1-P1 and Pc_all-Pr_all < (Pr1-P1)+(Pr2-P2), it indicates that the extra power only needs to be distributed to the AC / DC modules of the P1 and P2 branches, and all the remaining n-2 AC / DC modules operate at the optimal efficiency point power.

[0038] other cases can be deduced by analogy, until the extra power is completely distributed, and all the remaining AC / DC modules operate at the optimal efficiency point; wherein all non-faulty DC / DC modules control the electrolytic cells to operate at the rated voltage, rated current and rated power.

[0039] Similarly, when there is no fault in the AC / DC module, and the DC / DC module or the electrolyzer reports a fault, it indicates that the number of AC / DC modules is more than that of DC / DC modules at this time. Calculate the total required power Pc_all of the electrolyzer after removing the faulty power branches from n faulty branches; then compare the total power Pr_all with the total required power Pc_all of the electrolyzer; if Pr_all is greater than Pc_all, it indicates that when all AC / DC modules operate at their optimal points, the total power is greater than the power required by the electrolyzer, it is necessary to reduce the power of a certain AC / DC module at this time, so that the input power equals the output power. Therefore, the normal AC / DC modules except those in the P1 branch all operate at the optimal efficiency point power, and the power operated by the AC / DC module in the P1 branch is P1-(Pr_all-Pc_all); all fault-free DC / DC modules control the corresponding electrolyzers to operate at rated voltage, current and rated power, so as to ensure sufficient hydrogen production; when Pr_all is not greater than Pc_all, further comparison is carried out, If Pc_all-Pr_all<Pr1-P1, it indicates that the excess power only needs to be distributed to the AC / DC module of the P1 branch, and the remaining n-1 AC / DC modules all operate at the optimal efficiency point power.

[0040] If Pc_all-Pr_all>Pr1-P1, and Pc_all-Pr_all<(Pr1-P1)+(Pr2-P2), it indicates that the excess power only needs to be distributed to the AC / DC modules of the P1 and P2 branches, and the remaining n-2 AC / DC modules all operate at the optimal efficiency point power; Other situations can be deduced by analogy, until the excess power is completely distributed, and the remaining AC / DC modules all operate at the optimal efficiency point; wherein all fault-free DC / DC modules control the electrolyzers to operate at rated voltage, current and rated power.

[0041] In the present invention, when a certain electrolyzer has a fault or is under maintenance, the AC / DC modules in the faulty branch do not shut down. By overall distributing the total required power of normal electrolyzers to each AC / DC module, the AC / DC modules in the faulty branch do not shut down, and the maximum number of AC / DC modules can reach or exceed the power of their maximum efficiency point, thereby ensuring the overall efficiency of the system.

[0042] In the present invention, when the hydrogen production demand of a certain electrolyzer decreases, by overall distributing the total required power of normal electrolyzers to each AC / DC module, the maximum number of AC / DC modules can reach or exceed the power of their maximum efficiency point, thereby ensuring the overall efficiency of the system.

[0043] When the AC / DC module of a hydrogen production power source fails, this invention does not disconnect the DC / DC module and electrolyzer of the corresponding power branch, but supplies power through other power branches. Moreover, it can enable the most AC / DC modules to reach power above their maximum efficiency point, thus ensuring the overall efficiency of the system.

[0044] This invention also discloses a computer-readable storage medium storing a computer program thereon, which, when run by a processor, executes the steps of the method described above. This invention further discloses a control system for a hydrogen production power system, including an interconnected memory and a processor, wherein the memory stores a computer program that, when run by a processor, executes the steps of the method described above. The medium and control system of this invention correspond to the control methods described above and also possess the advantages described above.

[0045] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A control method based on a hydrogen production power system, characterized in that, The hydrogen production power system includes multiple power units and multiple electrolyzers. Each power unit includes an AC / DC module and a DC / DC module. The input terminal of the AC / DC module of each power unit is connected to the power grid. The output terminals of each AC / DC module are interconnected to form an intermediate DC loop. The input terminal of each DC / DC module is connected to the intermediate DC loop. The output terminal of each DC / DC module is connected to the electrolyzer in a corresponding manner. The control method includes the following steps: 1) Obtain the status information of the hydrogen production power system, including fault information of each AC / DC module, DC / DC module and electrolyzer, rated power of each normal AC / DC module and required power of each normal electrolyzer; 2) Allocate the power of the AC / DC modules according to the status information of the hydrogen production power system so that as many AC / DC modules as possible operate within the optimal efficiency range, while allocating the power of the DC / DC modules to meet the power requirements of the electrolyzer. In step 1), the power of each normal AC / DC module at its optimal efficiency point is added together to obtain the total power Pr_all, and the power demand of each normal electrolytic cell is added together to obtain the total demand power Pc_all. In step 2), the total power Pr_all is compared with the total demand power Pc_all; when the total demand power Pc_all is greater than the total power Pr_all, the difference between the two is calculated as Pc_all-Pr_all, and the power corresponding to the difference is allocated to some AC / DC modules, while other AC / DC modules operate at their optimal efficiency point, and all normal DC / DC modules control the electrolytic cell to operate at its rated power. When the total power demand Pc_all is less than the total power Pr_all, the power of one AC / DC module is reduced, while the other normal AC / DC modules operate at their optimal efficiency point; all normal DC / DC modules control the electrolytic cell to operate at its rated power. In step 1), when one or more AC / DC modules fail, the rated power of each normal AC / DC module is added together to obtain the total rated power Pr_max, and the required power of each electrolytic cell is added together to obtain the total required power Pc_all. In step 2), the total rated power Pr_max is compared with the total demand power Pc_all; when the total rated power Pr_max is less than the total demand power Pc_all, all normal AC / DC modules operate at rated power, while the power of the DC / DC module corresponding to the faulty AC / DC module is reduced, and other DC / DC modules control the electrolytic cell to operate at rated power. When the total rated power Pr_max is greater than the total required power Pc_all, comparing the total power Pr_all with the total required power Pc_all; when the total required power Pc_all is greater than the total power Pr_all, calculating the difference Pc_all-Pr_all between the two, distributing the power corresponding to the difference to some AC / DC modules, operating the other AC / DC modules at the optimal efficiency point, and controlling the electrolyzer to operate at rated power by all normal DC / DC modules; When the total required power Pc_all is less than the total power Pr_all, reducing the power of one AC / DC module to equalize the total required power Pc_all and the total power Pr_all, operating all other AC / DC modules at the optimal efficiency point; and controlling the electrolyzer to operate at rated power by all normal DC / DC modules.

2. The control method according to claim 1, characterized in that, In step 1), when the AC / DC modules have no fault, but one or more DC / DC modules or electrolyzers are in fault, obtaining the total power Pr_all by adding up the power at the optimal efficiency point of each normal AC / DC module, and obtaining the total required power Pc_all by adding up the required power of each normal electrolyzer; In step 2), comparing the total power Pr_all with the total required power Pc_all; when the total required power Pc_all is greater than the total power Pr_all, calculating the difference Pc_all-Pr_all between the two, distributing the power corresponding to the difference to some AC / DC modules, operating the other AC / DC modules at the optimal efficiency point, and controlling the electrolyzer to operate at rated power by all normal DC / DC modules; When the total required power Pc_all is less than the total power Pr_all, reducing the power of one AC / DC module to equalize the total required power Pc_all and the total power Pr_all, operating all other AC / DC modules at the optimal efficiency point; and controlling the electrolyzer to operate at rated power by all normal DC / DC modules.

3. The control method according to claim 1 or 2, characterized in that, The specific process of distributing the power corresponding to the difference to some AC / DC modules is as follows: if Pc_all-Pr_all<Pr1-P1, distributing the excess power to the AC / DC module of the P1 branch, and operating all the remaining n-1 AC / DC modules at the optimal efficiency point power; Pr1 is the rated power of the AC / DC module on the P1 branch; If Pr1-P1<Pc_all-Pr_all<(Pr1-P1)+(Pr2-P2), distributing the excess power to the AC / DC modules of the P1 and P2 branches, and operating all the remaining n-2 AC / DC modules at the optimal efficiency point power; Pr2 is the rated power of the AC / DC module on the P2 branch; the corresponding power of all AC / DC modules when located at the optimal efficiency point is sorted in descending order as P1, P2...Pn; The rest can be deduced by analogy until the excess power is completely distributed, and all remaining AC / DC modules operate at the optimal efficiency point.

4. The control method according to claim 3, characterized in that, When the total demand power Pc_all is less than the total power Pr_all, the power of the AC / DC module in branch P1 is reduced to make the total demand power Pc_all equal to the total power Pr_all, where the power of the AC / DC module in branch P1 is P1 - (Pr_all - Pc_all).

5. The control method according to claim 1, characterized in that, The AC / DC converter is a rectifier circuit composed of fully controlled components; the DC / DC module is a chopper circuit composed of fully controlled components.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, The computer program, when run by a processor, performs the steps of the method as described in any one of claims 1-5.

7. A control system for a hydrogen production power system, comprising a memory and a processor interconnected, wherein the memory stores a computer program, characterized in that, The computer program, when run by a processor, performs the steps of the method as described in any one of claims 1-5.

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