Water electrolysis hydrogen production power supply control system and method

Abstract

The present application discloses a water electrolysis hydrogen production power supply control system and method, which relates to the technical field of water electrolysis hydrogen production using renewable energy. The system includes: a controller, a rectifier transformer, at least two rectifier cabinets and an electrolyzer; the controller controls the rectifier transformer and the at least two rectifier cabinets; the primary side of the rectifier transformer is used to connect to a renewable energy power generation device; the secondary side of the rectifier transformer is connected to the at least two rectifier cabinets; the at least two rectifier cabinets supply power to the electrolyzer; the controller is used to control one or more of the at least two rectifier cabinets according to the real-time power generation of the renewable energy power generation device. The problem of low performance and waste in the water electrolysis hydrogen production power supply control system in the prior art is solved, and the number of working rectifier cabinets can be controlled according to the real-time power generation, thereby improving system performance and avoiding waste.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen production by water electrolysis using renewable energy, and in particular to a power supply control system and method for hydrogen production by water electrolysis. Background Art

[0002] In recent years, with the increasing global environmental pollution, energy crisis and global warming, the application and development of renewable energy have received more and more attention. Generating electricity through renewable energy for users has become an important research topic.

[0003] In the existing scheme, in order to ensure that the water electrolysis hydrogen production power supply control system can process the power generation of the renewable energy power generation device, it is usually configured according to the maximum power generation of the renewable energy power generation device. However, depending on the actual situation, the amount of electricity generated by the renewable energy power generation device at different times is different, and usually the maximum power generation may not be reached. This leads to the low performance of the above-mentioned water electrolysis hydrogen production power supply control system and a certain waste of resources. Summary of the invention

[0004] The purpose of the present application is to provide a water electrolysis hydrogen production power supply control system and method, which is used to solve the problem that the water electrolysis hydrogen production power supply control system in the prior art has low performance and certain resource waste.

[0005] The purpose of this application is achieved by the following technical solutions:

[0006] In a first aspect, a water electrolysis hydrogen production power supply control system is provided, the system comprising: a controller, a rectifier transformer, at least two rectifier cabinets and an electrolyzer;

[0007] The controller controls the rectifier transformer and the at least two rectifier cabinets;

[0008] The primary side of the rectifier transformer is used to be connected to a renewable energy power generation device;

[0009] The secondary side of the rectifier transformer is connected to the at least two rectifier cabinets;

[0010] The at least two rectifier cabinets supply power to the electrolyzer;

[0011] The controller is used to control the operation of one or more of the at least two rectifier cabinets according to the real-time power generation of the renewable energy power generation device.

[0012] By providing a control system with the above structure, the problem of low performance and waste in the prior art of water electrolysis hydrogen production power supply control system is solved, and the number of working rectifier cabinets can be controlled according to the real-time power generation, thereby improving the system performance and avoiding the problem of poor gas purity caused by ultra-low load operation of an ultra-large electrolytic cell.

[0013] Optionally, the phases of the secondary windings of the rectifier transformer differ by a preset angle, and each secondary winding corresponds to a rectifier cabinet. The number of rectifier cabinets is at least two, and the phases of the secondary windings corresponding to each rectifier cabinet differ by a preset angle, so that different numbers of rectifier cabinets can be operated to be equivalent to 6-pulse, 12-pulse, 18-pulse, 24-pulse, etc. multi-pulse rectifiers.

[0014] Optionally, the initial phase of each secondary winding is a preset phase with an arbitrary value. By setting the initial phase of each secondary winding to a preset phase with an arbitrary value, the flexibility of control system settings is increased.

[0015] Optionally, the electrolytic cell includes an electrolytic cell corresponding to each rectifier cabinet in the at least two rectifier cabinets. By providing a corresponding electrolytic cell for each rectifier cabinet, the problem of poor gas purity caused by ultra-low load operation of an oversized electrolytic cell can be avoided.

[0016] Optionally, the positive electrode of the electrolytic cell corresponding to each rectifier cabinet is connected to the rectifier cabinet, and the negative electrode is connected to the secondary winding corresponding to the rectifier cabinet. Through the above connection method, the electrolytic cell can perform electrolysis operation.

[0017] Optionally, the system further comprises a gas-liquid separation device, and the gas-liquid separation device is shared by the at least two electrolyzers. By sharing one gas-liquid separation device for at least two electrolyzers, the investment cost of the water electrolysis hydrogen production system is reduced, and the system is suitable for large-scale application.

[0018] Optionally, the number of the rectifier cabinets is 4;

[0019] When any single rectifier cabinet is in operation, the single rectifier cabinet is a 6-pulse rectifier;

[0020] When any two rectifier cabinets are in operation, the two rectifier cabinets are equivalent to 12-pulse rectifiers;

[0021] When any three rectifier cabinets are in operation, the three rectifier cabinets are equivalent to 18-pulse rectifiers;

[0022] When any four rectifier cabinets are in operation, the four rectifier cabinets are equivalent to 24-pulse rectifiers.

[0023] In a second aspect, a method for controlling a power supply for hydrogen production by water electrolysis is provided, the method being used in the control system as described in the first aspect, the method comprising:

[0024] Obtaining the real-time power generation of the renewable energy power generation device;

[0025] One or more rectifier cabinets are controlled to operate according to the real-time power generation.

[0026] By obtaining the real-time power generation of the renewable energy power generation device and controlling one or more rectifier cabinets to work according to the real-time power generation, the problem of low performance and waste of water electrolysis hydrogen production power control system in the prior art is solved, and the number of working rectifier cabinets can be controlled according to the real-time power generation, thereby improving system performance and avoiding waste.

[0027] Optionally, controlling one or more rectifier cabinets to operate according to the real-time power generation includes:

[0028] Determine the target number of rectifier cabinets required to work according to the relationship between the real-time power generation and the unit power consumption; the unit power consumption is the power that can be consumed by a rectifier cabinet;

[0029] Control the target number of rectifier cabinets to operate.

[0030] By determining the target number of rectifier cabinets to work in the above manner, the effect of improving the working performance of the above control system can be achieved without wasting resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0032] Figure 1 It is a system schematic diagram of a water electrolysis hydrogen production power supply control system provided in an embodiment of the present application;

[0033] Figure 2 It is a system schematic diagram of a water electrolysis hydrogen production power supply control system provided in an embodiment of the present application;

[0034] Figure 3 It is a system schematic diagram of a water electrolysis hydrogen production power supply control system provided in an embodiment of the present application;

[0035] Figure 4 It is a system schematic diagram of a water electrolysis hydrogen production power supply control system provided in an embodiment of the present application;

[0036] Figure 5 is a method flow chart of a water electrolysis hydrogen production power supply control method provided in an embodiment of the present application;

[0037] Figure 6 It is a flow chart of a method for controlling one or more operations in a rectifier cabinet provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] Below, the present application is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0039] Please refer to Figure 1 , which shows a system schematic diagram of a water electrolysis hydrogen production power supply control system provided by an embodiment of the present application, such as Figure 1 As shown, the system includes: a controller 11, a rectifier transformer 12, at least two rectifier cabinets 13 and an electrolytic cell 14;

[0040] The controller 11 controls the rectifier transformer 12 and the at least two rectifier cabinets 13;

[0041] The primary side of the rectifier transformer 12 is used to be connected to a renewable energy power generation device;

[0042] The secondary side of the rectifier transformer 12 is connected to the at least two rectifier cabinets 13;

[0043] The at least two rectifier cabinets 13 perform electrolysis through the electrolytic cell 14;

[0044] The controller 11 is used to control the operation of one or more of the at least two rectifier cabinets 13 according to the real-time power generation of the renewable energy power generation device.

[0045] The renewable energy power generation device includes at least one of the following: a hydrogen energy power generation device, a wind energy power generation device, a hydropower power generation device, a solar power generation device, a tidal power generation device, a geothermal power generation device, a wave power generation device, and an ocean power generation device. Unless otherwise specified, the renewable energy power generation device is illustrated as a hydrogen energy power generation device, but its specific power generation type is not limited. After generating electricity, the renewable energy power generation device is used to supply power to the rectifier transformer 12. Optionally, please refer to Figure 1 , the renewable energy power generation device can supply power to the rectifier transformer 12 through the high-voltage bus.

[0046] The primary side of the rectifier transformer 12 is connected to the renewable energy power generation device, and the secondary side is connected to at least two rectifier cabinets 13. Optionally, the rectifier transformer 12 is provided with n secondary windings, where n is the number of rectifier cabinets 13, and each secondary winding is used to connect one rectifier cabinet 13.

[0047] In a possible implementation, the phases of the secondary windings differ by a preset angle. The preset angle is an angle set according to different application scenarios. In actual implementation, the preset angle can be 15°. Of course, according to different application requirements, it can also be an angle of other values, which is not limited in this embodiment. In addition, the initial phase of each secondary winding is a preset phase of any value. For example, the preset phase can be 0°, 60°, or 45°, etc. In a possible implementation, when the preset phase is 0° and the preset angle is 15°, the phases of the four secondary windings are 0°, 15°, 30°, and 45°, respectively; when the preset phase is 5° and the preset angle is 15°, the phases of the four secondary windings are 5°, 20°, 35°, and 50°, respectively; and when the preset phase is 60° and the preset angle is 15°, the phases of the four secondary windings are 60°, 75°, 90°, and 105°, respectively. In addition, when n=4 and the phase difference of each secondary winding is a preset angle, by running different numbers of rectifier cabinets 13, it can be equivalent to a 6-pulse, 12-pulse, 18-pulse, or 24-pulse rectifier. Specifically:

[0048] When any single rectifier cabinet 13 is in operation, the single rectifier cabinet 13 is a 6-pulse rectifier;

[0049] When any two rectifier cabinets 13 are in operation, the two rectifier cabinets 13 are equivalent to 12-pulse rectifiers;

[0050] When any three rectifier cabinets 13 are in operation, the three rectifier cabinets 13 are equivalent to 18-pulse rectifiers;

[0051] When any four rectifier cabinets 13 are in operation, the four rectifier cabinets 13 are equivalent to 24-pulse rectifiers.

[0052] The above only uses the phase difference of each secondary winding by a preset angle as an example. In another possible embodiment, the phases of each secondary winding may be the same, for example, all are 40°, or all are 65°, which is not limited here.

[0053] Each rectifier cabinet 13 can be electrolyzed by an electrolytic cell 14. In actual implementation, each rectifier cabinet 13 uses an electrolytic cell 14 independently, that is, the electrolytic cell 14 mentioned above includes the electrolytic cell corresponding to each rectifier cabinet 13. By providing an independent electrolytic cell 14 for each rectifier cabinet 13, the problem of poor gas purity of hydrogen obtained by electrolysis due to ultra-low load operation of an oversized electrolytic cell 14 is avoided. When an independent electrolytic cell 14 is provided for each rectifier cabinet 13, the positive electrode of the electrolytic cell 14 corresponding to each rectifier cabinet 13 is connected to the rectifier cabinet 13, and the negative electrode is connected to the secondary winding corresponding to the rectifier cabinet 13. Please refer to Figure 2 , which shows a schematic structural diagram of the above control system when there are 4 rectifier cabinets.

[0054] When the renewable energy power generation device is a hydrogen energy power generation device, after the gas is obtained by electrolysis, gas-liquid separation is usually required, that is, the above-mentioned control system may also include a gas-liquid separation device. Optionally, in this embodiment, the gas-liquid separation device can be shared by each electrolyzer. That is to say, the present application can reduce the investment cost of the overall equipment by sharing the gas-liquid separation device, which is suitable for large-scale applications. In addition, when the above-mentioned control system includes a gas-liquid separation device, in order to realize the control of the above-mentioned gas-liquid separation device, the above-mentioned gas-liquid separation device can be connected to a controller.

[0055] Please refer to Figure 3 For example, there are 4 rectifier cabinets, each rectifier cabinet has an independent electrolytic cell, and each electrolytic cell is 500 cubic meters. Please refer to Figure 3 , which shows a system schematic diagram of a possible control system. Figure 3 As shown, the renewable energy power generation device inputs the power generation into the rectifier transformer through the high-voltage incoming line. The secondary side of the rectifier transformer is connected to 4 rectifier cabinets through a copper busbar. Each rectifier cabinet is connected to the electrolyzer through a copper busbar. In a possible embodiment, each electrolyzer can be a single-tank 500 cubic or more hydrogen production electrolyzer, and the rear end of each electrolyzer is connected to a common gas-liquid separation device. For example, please refer to Figure 3 The gas-liquid separation device can be a gas-liquid separation frame of 2000 cubic meters or more for a water electrolysis hydrogen production device. In order to achieve control, the controller can control each rectifier cabinet, the electrolyzer corresponding to each rectifier cabinet, and the gas-liquid separation device through a control signal.

[0056] Figure 3 Take the example of 4 rectifier cabinets, please refer to Figure 4 , which shows a schematic diagram of the structure when there are two rectifier cabinets and each electrolytic cell has a capacity of 1000 cubic meters. This embodiment will not be described in detail here. Figure 4 Each electrolytic cell can be a single 1000 cubic cell, or can be an electrolytic cell after two 500 cubic cell electrolytic cells, which will not be described in detail here.

[0057] In the above structure, the controller can control one or more of the at least two rectifier cabinets to work according to the real-time power generation of the renewable energy power generation device. That is, the controller can put the rectifier cabinets into operation one by one according to the increase of the real-time power generation, or the controller can cut off the operation of the rectifier cabinets one by one according to the decrease of the real-time power generation. Optionally, the controller can determine the target number of rectifier cabinets required to work according to the relationship between the real-time power generation and the unit power consumption; the unit power consumption is the power that can be consumed by a rectifier cabinet; and control the target number of rectifier cabinets to work. For example, assuming that the unit power consumption of a single rectifier cabinet is A, when the real-time power generation of the renewable energy power generation device is B, the number of rectifier cabinets required to be put into operation is B / A. Optionally, when B and A cannot be divided evenly, the number of rectifier cabinets put into operation is B / A rounded + 1. This embodiment is not limited here. The number of connected rectifier cabinets is controlled by the controller, so that multiple rectifier cabinets can work simultaneously, thereby achieving the effect of improving the power factor and reducing the harmonic content.

[0058] In summary, a water electrolysis hydrogen production power supply control system is provided, which includes a controller, a rectifier transformer, at least two rectifier cabinets and an electrolyzer; the controller controls the rectifier transformer and the at least two rectifier cabinets; the primary side of the rectifier transformer is used to connect to a renewable energy power generation device; the secondary side of the rectifier transformer is connected to the at least two rectifier cabinets; the at least two rectifier cabinets supply power to the electrolyzer; the controller is used to control one or more of the at least two rectifier cabinets according to the real-time power generation of the renewable energy power generation device. The problem of low performance and waste in the water electrolysis hydrogen production power supply control system in the prior art is solved, and the number of working rectifier cabinets can be controlled according to the real-time power generation, thereby improving system performance and avoiding the problem of poor gas purity caused by the ultra-low load operation of an ultra-large electrolyzer.

[0059] Please refer to Figure 5 , which shows a method flow chart of a water electrolysis hydrogen production power supply control method provided by an embodiment of the present application, the control method can be used for Figures 1 to 4 In the control system shown in Figure 5 As shown, the method includes:

[0060] Step 501, obtaining the real-time power generation of the renewable energy power generation device;

[0061] Step 502: Control one or more rectifier cabinets to operate according to the real-time power generation.

[0062] Optional, please refer to Figure 6 , step 502 may include:

[0063] Step 5021, determining the target number of rectifier cabinets required to work according to the relationship between the real-time power generation and the unit power consumption; the unit power consumption is the power that can be consumed by a rectifier cabinet;

[0064] Step 5022, controlling the target number of rectifier cabinets to operate.

[0065] The specific implementation of the above steps is similar to the control steps of the controller in the above embodiment. Please refer to the above embodiment for detailed technical details, which will not be repeated here.

[0066] In summary, by obtaining the real-time power generation of the renewable energy power generation device and controlling one or more rectifier cabinets to work according to the real-time power generation, the problem of low performance and waste of water electrolysis hydrogen production power supply control system in the prior art is solved, and the number of working rectifier cabinets can be controlled according to the real-time power generation, thereby improving system performance and avoiding waste.

[0067] This application is explained from the perspectives of purpose of use, effectiveness, progress and novelty. The practical progress it has is in line with the functional enhancement and usage requirements emphasized by the Patent Law. The above description and drawings of this application are only the preferred embodiments of this application, and are not intended to limit this application. Therefore, all structures, devices, features, etc. that are similar or identical to those of this application, that is, all equivalent replacements or modifications made in accordance with the scope of the patent application of this application, should fall within the scope of protection of the patent application of this application.

Claims

1. A water electrolysis hydrogen production power supply control system, characterized in that: The system comprises: a controller, a rectifier transformer, at least two rectifier cabinets and an electrolytic cell; The controller controls the rectifier transformer and the at least two rectifier cabinets; The primary side of the rectifier transformer is used to be connected to a renewable energy power generation device; The secondary side of the rectifier transformer is connected to the at least two rectifier cabinets; The at least two rectifier cabinets supply power to the electrolyzer; The controller is used to control one or more operations of the at least two rectifier cabinets according to the real-time power generation of the renewable energy power generation device; The phases of the secondary windings of the rectifier transformer differ by a preset angle, and each secondary winding corresponds to a rectifier cabinet; the initial phase of each secondary winding is a preset phase with an arbitrary value; The electrolytic cell includes an electrolytic cell corresponding to each rectifier cabinet of the at least two rectifier cabinets.

2. The system according to claim 1, characterized in that The positive pole of the electrolytic cell corresponding to each rectifier cabinet is connected to the rectifier cabinet, and the negative pole is connected to the secondary winding corresponding to the rectifier cabinet.

3. The system according to claim 1, characterized in that The system further comprises a gas-liquid separation device, which is shared by the at least two electrolytic cells.

4. The system according to claim 1, characterized in that The number of the rectifier cabinets is 4; When any single rectifier cabinet is in operation, the single rectifier cabinet is a 6-pulse rectifier; When any two rectifier cabinets are in operation, the two rectifier cabinets are equivalent to 12-pulse rectifiers; When any three rectifier cabinets are in operation, the three rectifier cabinets are equivalent to 18-pulse rectifiers; When any four rectifier cabinets are in operation, the four rectifier cabinets are equivalent to 24-pulse rectifiers.

5. A method for controlling a power supply for producing hydrogen by water electrolysis, characterized in that: The method is used in a control system as claimed in any one of claims 1 to 4, and the method comprises: Obtaining the real-time power generation of the renewable energy power generation device; One or more rectifier cabinets are controlled to operate according to the real-time power generation.

6. The method according to claim 5, characterized in that The controlling one or more rectifier cabinets to work according to the real-time power generation includes: Determine the target number of rectifier cabinets required to work and the load corresponding to each rectifier cabinet according to the real-time power generation; The target number of rectifier cabinets are controlled to operate according to the load corresponding to each of the rectifier cabinets.

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