New-energy hydrogen production power supply, and new-energy hydrogen production system and control method therefor

Abstract

Provided in the present application are a new-energy hydrogen production power supply, and a new-energy hydrogen production system and a control method therefor. The new-energy hydrogen production power supply comprises: a rectification stage, which is used for connecting to a power bus to perform conversion between an alternating current and a direct current; an energy storage stage, which is connected to a direct-current side of the rectification stage in parallel and is used for absorbing, storing and / or releasing electric energy; and a chopping stage, which is separately connected to the rectification stage and an electrolyzer and is used for increasing or reducing a direct-current voltage and providing a direct current to the electrolyzer. The control method for a new-energy hydrogen production system comprises: on the basis of the power generation condition of a power bus, controlling a new-energy hydrogen production power supply to operate in the following operating modes: a new-energy low generation mode, a new-energy hydrogen production mode, a new-energy fluctuation mode and a new-energy power-deficient mode. The new-energy hydrogen production power supply has an energy storage link, can operate in modes where the new-energy output is low or fluctuates rapidly, can absorb or send active power to maintain the operation of an electrolyzer, and can use an energy storage stage to mitigate new-energy fluctuations, thus maximizing the utilization of new-energy power.

Description

New energy hydrogen production power supply, system and control method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of water electrolysis hydrogen production, in particular to a new energy hydrogen production power supply, system and control method thereof. BACKGROUND

[0002] Hydrogen is the first element of the periodic table, and has both raw material and energy properties. When hydrogen releases energy, the main product is water, and there is no greenhouse gas emission, so hydrogen energy is the ultimate environmentally friendly energy carrier for mankind. However, the current mainstream hydrogen production methods, such as fossil energy hydrogen production and coal-fired hydrogen production, inevitably produce greenhouse gases during production, and do not achieve the purpose of carbon reduction. The entire production process of direct water electrolysis hydrogen production using new energy power generation is carbon-free, so it is an important technical route to achieve the dual carbon goal.

[0003] However, new energy power generation mainly uses wind power and solar power, which has the characteristics of volatility and poor stability, and the electrolytic cell for water electrolysis requires stable power supply. The volatility of new energy makes the electrolytic cell unable to work continuously and stably, and frequent start-stop leads to the fact that pure off-grid hydrogen production is currently not possible. This makes it urgent for new energy hydrogen production to have a hydrogen production power supply that can smooth out power fluctuations and maintain continuous production of electrolytic cells.

[0004] The above information disclosed in the background section is only used to enhance the understanding of the background of the present application, and therefore it can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] In order to solve at least one of the above problems, the present application proposes a new energy hydrogen production power supply, system and control method thereof.

[0006] According to a first aspect of the present application, at least one embodiment of the present application provides a new energy hydrogen production power supply, comprising: a rectification stage connected with a power supply bus for converting alternating current into direct current; an energy storage stage connected in parallel with the direct current side of the rectification stage for absorbing, storing and / or releasing electric energy; and a chopper stage connected with the rectification stage and an electrolytic cell respectively for increasing or decreasing direct current voltage to provide direct current for the electrolytic cell.

[0007] For example, in some embodiments of the present application, the rectification stage includes semiconductor devices connected in series and / or in parallel.

[0008] For example, in some embodiments of the present application, the energy storage stage comprises: a group of energy storage units or at least two groups of energy storage units connected in parallel, the energy storage units comprising: a battery, or a battery and a semiconductor device, or a battery and a mechanical switch, or a super capacitor, or a super capacitor and a semiconductor device, or a super capacitor and a mechanical switch.

[0009] For example, in some embodiments of the present application, the semiconductor device comprises a reversible diode.

[0010] For example, in some embodiments of the present application, the chopper stage comprises: a group of chopper units or at least two groups of chopper units connected in parallel, the chopper units comprising: a first semiconductor device, an inductor and a capacitor connected in series; a diode or a second semiconductor device connected in parallel with the inductor and the capacitor.

[0011] According to a second aspect of the present application, at least one embodiment of the present application provides a new energy hydrogen production system, comprising: a main switch connected with a power bus; a transformer connected with the main switch; a new energy hydrogen production power supply as described in any one of the first aspect, connected with the transformer.

[0012] For example, in some embodiments of the present application, further comprising: a filter connected between the transformer and the new energy hydrogen production power supply to reduce the amount of harmonic generation.

[0013] According to a third aspect of the present application, at least one embodiment of the present application provides a control method for a new energy hydrogen production system as described, comprising: according to the power generation condition of the power bus, controlling the new energy hydrogen production power supply to work in the following working modes: in the case that the power generation power of the power bus is lower than the first running load of the electrolytic cell and there is no power generation fluctuation, controlling the new energy hydrogen production power supply to enter a new energy low generation mode; in the case that the power generation power of the power bus is higher than the first running load and there is no power generation fluctuation, controlling the new energy hydrogen production power supply to enter a new energy hydrogen production mode; in the case that the power generation of the power bus fluctuates, controlling the new energy hydrogen production power supply to enter a new energy fluctuation mode; in the case that the power bus has no power generation, controlling the new energy hydrogen production power supply to enter a new energy no power mode.

[0014] For example, in some embodiments of the present application, the control of the new energy hydrogen production power supply to enter the new energy low generation mode comprises: controlling the rectifier stage to work in a rectification mode and output a first voltage to charge the energy storage stage; controlling the chopper stage to stop working; in the case that the storage capacity of the energy storage stage is higher than a preset first threshold, controlling the energy storage stage to stop charging.

[0015] For example, in some embodiments of the present application, the control of the new energy hydrogen production power supply into the new energy hydrogen production mode includes: controlling the rectifier stage to work in a rectification mode; controlling the chopping stage to work in a chopping mode, and modulating the power output by the rectifier stage to the working voltage of the electrolytic cell; and controlling the energy storage stage to stop working, and generating power from the power supply bus to provide power to the electrolytic cell.

[0016] For example, in some embodiments of the present application, the control of the new energy hydrogen production power supply into the new energy fluctuation mode includes: controlling the rectifier stage to work in a rectification mode; controlling the chopping stage to work in a chopping mode, and modulating the power output by the rectifier stage to the working voltage of the electrolytic cell; in the case that the storage power of the energy storage stage is higher than a preset second threshold, controlling the energy storage stage to discharge, and controlling the chopping stage to increase the output power to consume the storage power of the energy storage stage; and in the case that the storage power of the energy storage stage is lower than the second threshold, controlling the energy storage stage to charge, and controlling the chopping stage to reduce the output power to control the output voltage of the rectifier stage to supply power to the energy storage stage.

[0017] For example, in some embodiments of the present application, the control of the new energy hydrogen production power supply into the new energy fluctuation mode includes: controlling the rectifier stage to work in a rectification mode; controlling the chopping stage to work in a chopping mode, and modulating the power output by the rectifier stage to the working voltage of the electrolytic cell; in the case that the storage power of the energy storage stage is higher than a preset second threshold, controlling the energy storage stage to discharge, and controlling the chopping stage to increase the output power to consume the storage power of the energy storage stage; and in the case that the storage power of the energy storage stage is lower than the second threshold, controlling the energy storage stage to charge, and controlling the chopping stage to reduce the output power to control the output voltage of the rectifier stage to supply power to the energy storage stage.

[0018] For example, in some embodiments of the present application, further comprising: in the case that the storage power of the energy storage stage is lower than a preset third threshold, controlling the electrolytic cell to stop producing hydrogen, and controlling the electrolytic cell to be in a hot standby state; and in the case that the storage power of the energy storage stage is lower than a preset fourth threshold, controlling the electrolytic cell to stop running.

[0019] For example, in some embodiments of the present application, the control of the new energy hydrogen production power supply in the working mode according to the power generation condition of the power supply bus further includes: in the case of fluctuation or failure of the power system, controlling the new energy hydrogen production power supply to enter a grid-connected mode.

[0020] For example, in some embodiments of the present application, the control of the new energy hydrogen production power supply into the network mode includes: controlling the new energy hydrogen production power supply to work at a preset control voltage and control frequency in an equivalent voltage source mode; in the case that the frequency of the power system exceeds the preset control frequency, controlling the rectification stage to continuously convert alternating current into direct current and store in the energy storage stage; in the case that the frequency of the power system is lower than the preset control frequency, controlling the rectification stage to continuously convert direct current into alternating current and release the electrical energy in the energy storage stage to support the grid frequency and provide inertia support; in the case that the voltage of the power system exceeds the preset control voltage, controlling the rectification stage to continuously absorb reactive power to reduce the system voltage; in the case that the voltage of the power system is lower than the preset control voltage, controlling the rectification stage to continuously emit reactive power to increase the system voltage.

[0021] The present application provides a hydrogen production power supply with an energy storage link, which uses full-controlled devices as main power switching devices, can realize high-frequency turn-on or turn-off control, and achieve millisecond-level fast regulation purpose. Moreover, the new energy hydrogen production power supply has an energy storage link, can work in a mode with small new energy output and rapid output fluctuation, absorbs or emits active power, maintains the production of electrolytic cells, uses the energy storage stage to suppress new energy fluctuation, and maximizes the use of new energy power.

[0022] The present application provides a new energy hydrogen production system and a control method thereof, the power supply bus can work in four working states of active output, active input, reactive output and reactive input, has fast response speed, good harmonic characteristics and four-quadrant working capability. Moreover, the system has the functions of stabilizing grid frequency and voltage and suppressing grid power oscillation. In the case of power supply rapid fluctuation, the system can also smooth the output on the direct current side, so that the electrolytic cell can slowly change according to the set regulation speed, and maintain the normal working state of the electrolytic cell.

[0023] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description of example embodiments thereof, taken in conjunction with the accompanying drawings. The drawings described below are only some embodiments of the present application, not a limitation of the present application.

[0025] FIG. 1 shows a schematic diagram of a new energy hydrogen production power supply device structure with an energy storage link according to an example embodiment;

[0026] FIG. 2 shows a schematic diagram of a new energy hydrogen production power supply topology with an energy storage link according to an example embodiment;

[0027] FIG. 3 shows a second exemplary new energy hydrogen production power supply topology with energy storage link;

[0028] FIG. 4 shows a third exemplary new energy hydrogen production power supply topology with energy storage link;

[0029] FIG. 5 shows a fourth exemplary new energy hydrogen production power supply topology with energy storage link;

[0030] FIG. 6 shows a fifth exemplary new energy hydrogen production power supply topology with energy storage link;

[0031] FIG. 7 shows a new energy hydrogen production system topology of an exemplary embodiment;

[0032] FIG. 8 shows a control method flow chart for a new energy hydrogen production system of an exemplary embodiment. DETAILED DESCRIPTION

[0033] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the description.

[0034] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the techniques described can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, methods, devices, implementations, materials, and so forth have not been described in detail in order to avoid obscuring aspects of the disclosure.

[0035] The flow diagrams shown in the Figures are merely examples and are not necessarily to be construed as having any dependencies, or any order, unless explicitly stated. For example, some operations or steps can be performed at the same time, or in a different order. Consequently, the order of execution of the operations or steps can be changed, and / or two or more operations or steps can be performed concurrently.

[0036] The terms "first", "second", and the like in the description and in the claims of the present application and in the above drawings are used to distinguish between similar objects, not to describe a particular sequential order. Moreover, the terms "include", and "have", and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a list of steps or units is not necessarily limited to the listed steps or units, but can optionally further include additional steps or units not listed, or can optionally further include other steps or units inherent to such process, method, product, or device.

[0037] Those skilled in the art can understand that the drawings are only schematic views of the example embodiments, and the modules or flows in the drawings are not necessarily essential for implementing the present application, and therefore cannot be used to limit the protection scope of the present application.

[0038] Figure 1 shows a schematic diagram of a new energy hydrogen production power supply device structure with an energy storage link according to an example embodiment.

[0039] As shown in Figure 1, the new energy hydrogen production power supply with an energy storage link includes a rectification stage 4, an energy storage stage 5, and a chopping stage 6. The rectification stage 4 is used to connect with the power supply bus, and to realize AC / DC conversion through control of semiconductor devices to convert AC power and DC power. The energy storage stage 5 is connected in parallel with the DC side of the rectification stage 4, and is used to absorb, store, and / or release electric energy. The chopping stage 6 is connected with the rectification stage 4 and the electrolytic cell 7, respectively, and is used to raise or lower the DC voltage, to realize full-range adjustment of the DC by modulating the output of the rectification stage and the energy storage stage, and to provide DC power for the electrolytic cell 7 to meet the hydrogen production demand of the electrolytic cell.

[0040] Figure 2 shows an example schematic diagram of a new energy hydrogen production power supply topology with an energy storage link according to an example embodiment.

[0041] As shown in Figure 2, the rectification stage 4 includes semiconductor devices connected in series and / or in parallel.

[0042] The semiconductor devices include field effect tubes, and can be composed of fully controlled devices such as IGBTs or IGCTs and their associated circuits, and the fully controlled devices are controlled to be quickly turned on or turned off to change the DC side voltage or current, as shown in Figure 2. The rectification stage 4 can also use semi-controlled or non-controlled devices to realize the rectification function. When a semi-controlled or non-controlled device is used in the rectification circuit, low-order harmonics are generated, reactive power is consumed, and the ability to work in four quadrants is not possessed. The semiconductor devices use semi-controlled devices, including thyristors, as shown in Figure 4; and the semiconductor devices use non-controlled devices, including diodes, as shown in Figure 5.

[0043] The energy storage stage 5 includes a group of energy storage units, and the energy storage units include batteries. The energy storage stage 5 is connected in parallel with the DC output side of the rectification stage 4.

[0044] Optionally, the energy storage unit includes a battery and a semiconductor device, and the energy storage stage 5 is connected in parallel to the DC output side of the rectification stage 4. The semiconductor device is connected in series with the battery, wherein the semiconductor device is a reversible conduction device. The semiconductor device is configured to control whether the energy storage stage is connected to the new energy hydrogen production power source. The semiconductor device includes a power electronic device.

[0045] Optionally, the energy storage unit includes a battery and a mechanical switch. The mechanical switch is connected in series with the battery, and the mechanical switch is controlled to control whether the energy storage stage is connected to the new energy hydrogen production power source. The energy storage unit can also include a super capacitor, or a super capacitor and a semiconductor device, or a super capacitor and a mechanical switch. The present application is only an example, but is not limited thereto.

[0046] When the new energy power generation of the power bus rapidly drops or rises, the reversible conduction device of the energy storage stage can release or absorb energy, without affecting the electrolytic tank to work normally; when the new energy power generation of the power bus suddenly disappears, the energy storage stage releases energy to support the electrolytic tank to adjust at a predetermined speed; when the frequency of the new energy power generation of the power bus fluctuates, the energy storage stage absorbs and releases energy to provide damping to suppress frequency rise and oscillation.

[0047] The chopper stage 6 includes a group of chopper units. The chopper unit includes a first semiconductor device, an inductor and a capacitor connected in series.

[0048] The chopper stage 6 further includes a diode connected in parallel with the inductor and the capacitor, and a full-controlled device such as an IGBT and the diode form a DC voltage reduction chopper circuit, as shown in FIG. 2. The chopper stage 6 further includes a second semiconductor device connected in parallel with the inductor and the capacitor, and all full-controlled devices form a DC voltage boost-chopper current, having a boost-buck function, as shown in FIG. 3.

[0049] According to some embodiments, the rectification stage 4 can further include at least two groups of semiconductor device units connected in parallel, each semiconductor device unit including semiconductor devices connected in series and / or in parallel. The energy storage stage 5 can further include at least two groups of energy storage units connected in parallel. The chopper stage 6 can further include at least two groups of chopper units connected in parallel. As shown in FIG. 6, to increase the capacity of the hydrogen production power source and increase the current. The number of semiconductor device units of the rectification stage 4, energy storage units of the energy storage stage 5 and chopper units of the chopper stage 6 can be consistent, or can be set by themselves, and the present application does not limit them.

[0050] The present application provides a hydrogen production power source with an energy storage link, which uses full-controlled devices as main power switching devices, can realize high-frequency on or off control, and achieve millisecond-level rapid regulation purposes. Moreover, the new energy hydrogen production power source has an energy storage link, can work in a mode of small new energy output and rapid output fluctuation, absorb or emit active power, maintain the production of the electrolytic tank, use the energy storage stage to suppress new energy fluctuations, and maximize the use of new energy power.

[0051] The application also provides a new energy hydrogen production system. As shown in FIG. 1, the new energy hydrogen production system comprises a main switch 2, a transformer 3 and the hydrogen production power supply with an energy storage link as described above. The main switch 2 is connected with the power supply bus 1. The transformer 3 is connected with the main switch 2. The new energy hydrogen production power supply is connected with the transformer 3. The electrolytic tank 7 is connected with the new energy hydrogen production power supply to receive the electric energy output by the new energy hydrogen production power supply for working.

[0052] According to some embodiments, the new energy hydrogen production system further comprises a filter connected between the transformer 3 and the new energy hydrogen production power supply to reduce the harmonic generation amount of the new energy hydrogen production system, as shown in FIG. 6 and FIG. 7. The filter comprises an inductor and a capacitor.

[0053] FIG. 8 shows a flow chart of a control method for the new energy hydrogen production system according to an exemplary embodiment.

[0054] The application also proposes a control method for the new energy hydrogen production system as described above, which comprises steps S601-S605.

[0055] In step S601, according to the power generation condition of the power supply bus, the new energy hydrogen production power supply is controlled to work in the following working modes.

[0056] In step S602, when the power generation power of the power supply bus is lower than the first running load of the electrolytic tank and there is no power generation fluctuation, the new energy hydrogen production power supply is controlled to enter the new energy low generation mode.

[0057] According to some embodiments, the first running load can be the minimum running load of the electrolytic tank.

[0058] S6021, control the main switch to close;

[0059] S6022, control the new energy hydrogen production power supply to enter the new energy low generation mode, comprising:

[0060] controlling the rectification stage to work in the rectification mode to convert alternating current into direct current and output a first voltage to the energy storage stage for charging, and controlling the chopper stage to stop working.

[0061] When the storage capacity of the energy storage stage is higher than a preset first threshold value, the energy storage stage is controlled to stop charging.

[0062] In step S603, when the power generation power of the power supply bus is higher than the first running load and there is no power generation fluctuation, the new energy hydrogen production power supply is controlled to enter the new energy hydrogen production mode.

[0063] S6031, control the main switch to close;

[0064] S6032, control the new energy hydrogen production power supply to enter the new energy hydrogen production mode, including:

[0065] Control the rectifier stage to work in the rectification mode. Control the chopper stage to work in the chopping mode, and modulate the power output by the rectifier stage to the working voltage of the electrolytic cell. Control the energy storage stage to stop working, and generate power from the power bus to provide power to the electrolytic cell to maintain the operation of the electrolytic cell equipment.

[0066] In step S604, in the case of power bus power fluctuation, control the new energy hydrogen production power supply to enter the new energy fluctuation mode.

[0067] S6041, control the main switch to close;

[0068] S6042, control the new energy hydrogen production power supply to enter the new energy fluctuation mode, including:

[0069] Control the rectifier stage to work in the rectification mode. Control the chopper stage to work in the chopping mode, and modulate the power output by the rectifier stage to the working voltage of the electrolytic cell.

[0070] In the case where the storage capacity of the energy storage stage is higher than the preset second threshold, control the energy storage stage to discharge, and control the chopper stage to increase the output power to consume the storage capacity of the energy storage stage.

[0071] In the case where the storage capacity of the energy storage stage is lower than the preset second threshold, control the energy storage stage to charge, and control the chopper stage to reduce the output power to control the output voltage of the rectifier stage to power the energy storage stage.

[0072] In step S605, in the case of no power generation of the power bus, control the new energy hydrogen production power supply to enter the new energy no power mode.

[0073] S6051, control the main switch to close;

[0074] S6052, control the new energy hydrogen production power supply to enter the new energy no power mode, including:

[0075] Control the rectifier stage to stop working. Control the energy storage stage to work. Control the chopper stage to work in the chopping mode, and modulate the power output by the energy storage stage to the working voltage of the electrolytic cell.

[0076] S6053, in the case where the storage capacity of the energy storage stage is lower than the preset third threshold, control the electrolytic cell to stop hydrogen production, control the electrolytic cell to be in a hot standby state, and the output capacity of the energy storage stage is only used to maintain the internal temperature and pressure of the electrolytic cell.

[0077] S6054, in the case where the storage capacity of the energy storage stage is lower than the preset fourth threshold, the storage capacity of the energy storage stage is insufficient to maintain the electrolytic cell in a hot standby state, control the electrolytic cell to stop running and enter a shutdown state.

[0078] According to some embodiments, the fourth threshold is lower than the third threshold.

[0079] The new energy hydrogen production system provided in the application has a grid forming function. By controlling the hydrogen production power supply to operate in an ideal voltage source mode, inertia support is provided when the power supply of the power system fluctuates or fails.

[0080] In step S606, the new energy hydrogen production power supply is controlled to enter a grid forming mode in the case of power system fluctuation or failure.

[0081] According to an example embodiment, controlling the new energy hydrogen production power supply to enter a grid forming mode includes controlling the new energy hydrogen production power supply to operate in a preset control voltage and control frequency in an equivalent voltage source mode, wherein:

[0082] In the case that the frequency of the power system exceeds the preset control frequency, the rectification stage is controlled to continuously convert alternating current into direct current and store in the energy storage stage; in the case that the frequency of the power system is lower than the preset control frequency, the rectification stage is controlled to continuously convert direct current into alternating current and release the energy in the energy storage stage to support the grid frequency and provide inertia support. In the case that the voltage of the power system exceeds the preset control voltage, the rectification stage is controlled to continuously absorb reactive power to reduce the system voltage; in the case that the voltage of the power system is lower than the preset control voltage, the rectification stage is controlled to continuously emit reactive power to increase the system voltage.

[0083] The application provides a new energy hydrogen production system and a control method thereof. The power supply bus can work in four working states of active output, active input, reactive output and reactive input, has fast response speed, good harmonic characteristics and four-quadrant working capability. The system has the functions of stabilizing the grid frequency and voltage and can suppress the power oscillation of the grid. In the case of rapid fluctuation of the power supply, the system can also smooth the output on the direct current side, so that the electrolytic tank can change slowly according to the set adjustment speed, and the normal working state of the electrolytic tank can be maintained.

[0084] It should be clearly understood that the application describes how to form and use specific examples, but the application is not limited to any details of these examples. On the contrary, based on the teachings of the disclosure of the application, these principles can be applied to many other embodiments.

[0085] In addition, it should be noted that the above figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the application, and are not for limiting purposes. It is easy to understand that the processes shown in the above figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be executed synchronously or asynchronously, for example, in multiple modules.

[0086] The exemplary embodiments of this application are specifically illustrated and described herein. But, it is to be understood that the application is not limited to the details of the illustrated implementations; rather, this application is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A new energy hydrogen production power supply, characterized in that, Comprising: a rectification stage for connecting with a power bus, converting alternating current into direct current; a storage stage connected in parallel with a direct current side of the rectification stage, for absorbing, storing and / or releasing electric energy; a chopper stage connected with the rectification stage and an electrolytic cell respectively, for raising or lowering direct current voltage, providing direct current for the electrolytic cell.

2. The new energy hydrogen production power supply of claim 1, wherein, The rectification stage comprises semiconductor devices connected in series and / or in parallel.

3. The new energy hydrogen production power supply of claim 1, wherein, The storage stage comprises: a group of storage units or at least two groups of storage units connected in parallel, the storage units comprising: a battery, or a battery and a semiconductor device, or a battery and a mechanical switch, or a super capacitor, or a super capacitor and a semiconductor device, or a super capacitor and a mechanical switch.

4. The new energy hydrogen production power supply of claim 3, wherein, The semiconductor device comprises a reversible conducting device.

5. The new energy hydrogen production power supply of claim 1, wherein, The chopper stage comprises: a group of chopper units or at least two groups of chopper units connected in parallel, the chopper units comprising: a first semiconductor device, an inductor and a capacitor connected in series; a diode or a second semiconductor device connected in parallel with the inductor and the capacitor.

6. A new energy hydrogen production system, characterized in that, Comprising: a main switch connected with a power bus; a transformer connected with the main switch; a new energy hydrogen production power source according to any one of claims 1-5, connected with the transformer.

7. The new energy hydrogen production system of claim 6, wherein, Further comprising: a filter connected between the transformer and the new energy hydrogen production power source to reduce the amount of harmonic waves generated.

8. A control method for the new energy hydrogen production system according to claim 6 or 7, characterized in that, Comprising: controlling the new energy hydrogen production power source to work in the following working modes according to the power generation of the power bus: in the case that the power generation of the power bus is lower than the first running load of the electrolytic cell and there is no power generation fluctuation, controlling the new energy hydrogen production power source to enter a new energy low generation mode; in the case that the power generation of the power bus is higher than the first running load and there is no power generation fluctuation, controlling the new energy hydrogen production power source to enter a new energy hydrogen production mode; in the case that there is power generation fluctuation of the power bus, controlling the new energy hydrogen production power source to enter a new energy fluctuation mode; in the case that there is no power generation of the power bus, controlling the new energy hydrogen production power source to enter a new energy no power mode.

9. The control method according to claim 8, characterized by, The control of the new energy hydrogen production power source to enter the new energy low generation mode comprises: controlling the rectification stage to work in a rectification mode and output a first voltage to charge the storage stage; controlling the chopper stage to stop working; in the case that the storage capacity of the storage stage is higher than a preset first threshold, controlling the storage stage to stop charging.

10. The control method according to claim 8, characterized by, The control of the new energy hydrogen production power source to enter the new energy hydrogen production mode comprises: controlling the rectification stage to work in a rectification mode; controlling the chopper stage to work in a chopping mode, modulating the electric energy output by the rectification stage to the working voltage of the electrolytic cell; controlling the storage stage to stop working, and providing electric energy for the electrolytic cell by power generation of the power bus.

11. The control method according to claim 8, characterized by, The control of the new energy hydrogen production power source to enter the new energy fluctuation mode comprises: controlling the rectification stage to work in a rectification mode; controlling the chopper stage to work in a chopping mode, modulating the electric energy output by the rectification stage to the working voltage of the electrolytic cell; In a case where the storage capacity of the energy storage stage is higher than a preset second threshold, the energy storage stage is controlled to discharge, and the chopping stage is controlled to increase the output power, so as to consume the storage capacity of the energy storage stage; In a case where the storage capacity of the energy storage stage is lower than the second threshold, the energy storage stage is controlled to charge, and the chopping stage is controlled to reduce the output power, so as to control the rectifier stage to output the voltage to supply power to the energy storage stage.

12. The control method according to claim 8, characterized by, The control of the new energy hydrogen production power supply into the new energy powerless mode comprises: controlling the rectifier stage to stop working; controlling the energy storage stage to work; controlling the chopping stage to work in the chopping mode, and modulating the electrical energy output by the energy storage stage to the working voltage of the electrolytic cell.

13. The control method according to claim 12, characterized by, Further comprising: In a case where the storage capacity of the energy storage stage is lower than a preset third threshold, the electrolytic cell is controlled to stop producing hydrogen, and the electrolytic cell is controlled to be in a hot standby state; In a case where the storage capacity of the energy storage stage is lower than a preset fourth threshold, the electrolytic cell is controlled to stop running.

14. The control method according to claim 8, characterized by, The control of the new energy hydrogen production power supply in the following working modes according to the power generation condition of the power supply bus further comprises: In a case of power system fluctuation or failure, the new energy hydrogen production power supply is controlled to enter the grid-connected mode.

15. The control method according to claim 14, characterized by, The control of the new energy hydrogen production power supply into the grid-connected mode comprises: controlling the new energy hydrogen production power supply to work in the equivalent voltage source mode at a preset control voltage and control frequency, wherein: In a case where the frequency of the power system exceeds a preset control frequency, the rectifier stage is controlled to continuously convert alternating current into direct current and store in the energy storage stage; In a case where the frequency of the power system is lower than the preset control frequency, the rectifier stage is controlled to continuously convert direct current into alternating current, and release the electrical energy in the energy storage stage, so as to support the grid frequency and provide inertia support; In a case where the voltage of the power system exceeds a preset control voltage, the rectifier stage is controlled to continuously absorb reactive power, so as to reduce the system voltage; In a case where the voltage of the power system is lower than the preset control voltage, the rectifier stage is controlled to continuously emit reactive power, so as to increase the system voltage.

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