AC Bus Renewable Energy Hydrogen Production Power Supply Device and Its Control Method

Abstract

This application relates to the technical field of renewable energy hydrogen production, and particularly to an AC bus renewable energy hydrogen production power supply device and its control method. Among them, the device includes: a hydrogen production power supply component, which has first to third hydrogen production modes; a matching component for matching the optimal mode of the hydrogen production power supply component from the first to third hydrogen production modes according to the user's budget, expected service life, and / or grid auxiliary service capabilities; and a control component for controlling the hydrogen production power supply component to produce hydrogen using AC bus renewable energy according to the optimal mode. Thus, the problem of the lack of existing large-capacity renewable energy hydrogen production power supply system solutions is solved, providing a practical technical solution for the design and operation of large-scale renewable energy hydrogen production power supply devices, effectively reducing the cost of hydrogen production power supply devices in the field of renewable hydrogen production. It is expected that users can select from the proposed solutions according to their own requirements, promoting industrialization.

Description

Technical Field

[0001] The present application relates to the technical field of renewable energy hydrogen production, and particularly relates to an AC bus renewable energy hydrogen production power supply device and a control method thereof. Background Art

[0002] In March 2022, the National Development and Reform Commission and the National Energy Administration jointly issued the Medium- and Long-Term Development Plan for the Hydrogen Energy Industry (2021-2035), marking that hydrogen energy has become an important part of China's energy system. Among them, renewable energy hydrogen production (green hydrogen) is one of the most promising technical routes at present because it can achieve zero carbon emissions while improving the utilization of wind / solar energy.

[0003] In related technologies, there are often biological hydrogen production, water electrolysis hydrogen production, and AC bus hydrogen production. Compared with biological hydrogen production, water electrolysis hydrogen production has become one of the potential main sources of hydrogen due to its rich and easily available raw materials. Among them, the electrolyzer is the core device of water electrolysis hydrogen production, which is mainly divided into alkaline electrolyzers, proton exchange membrane (PEM) electrolyzers, and solid oxide electrolyzers. Among them, alkaline electrolyzers have the most extensive commercial applications. As a DC load, the single-cell power of an alkaline electrolyzer can exceed 5 MW, the typical production capacity range is 20%-100%, the typical operating voltage range is 20 V-600 V, and the maximum operating current exceeds 10,000 A. It is a typical low-voltage and high-current load, and the demand for high-power hydrogen production power supply devices is very clear. However, due to the lack of engineering practice, relevant improvement and design still require a long time.

[0004] AC bus hydrogen production is a typical mode of distributed new energy hydrogen production (as Figure 1 shown). In this mode, a wind farm / solar power plant collects its energy into a 110 kV high-voltage AC bus and supplies power to the hydrogen production power supply through a 110 / 66 / 35 kV transformer from the same bus. In this mode, a hydrogen production station (including multiple electrolyzers) can be regarded as a flexible load of the system, accepting grid dispatching instructions, and deeply participating in peak shaving and frequency modulation in the medium- and long-term time scales of the system without changing the original structure of the system. Therefore, developing related technologies for this mode is of great significance for supporting the construction of a new power system. At the initial stage of the current development of renewable energy hydrogen production, it is urgent to propose a low-cost hydrogen production power supply scheme under the condition of meeting the grid-connected power quality standards of the load and the special operating requirements of the equipment itself to promote the further development of the industry and related technologies.

[0005] However, the relevant technologies are all aimed at small-capacity (1MW) renewable energy hydrogen production application scenarios. As renewable energy hydrogen production participates in the auxiliary services of new power systems, there is an urgent need to upgrade the capacity of a single hydrogen production station. According to the survey, users have different requirements for which topology to choose and which technical route to adopt to meet the large current requirements of the load, as well as the high DC bus voltage and extremely high control accuracy, which need to be solved urgently. Summary of the invention

[0006] The present application provides an AC bus renewable energy hydrogen production power supply device and a control method thereof to solve the problem of the lack of existing large-capacity renewable energy hydrogen production power supply system solutions, and provides a practical technical solution for the design and operation of large-scale renewable energy hydrogen production power supply devices, effectively reducing the cost of hydrogen production power supply devices in the field of renewable hydrogen production. It is expected that users can choose from the proposed solutions according to their own requirements to promote industrialization.

[0007] A first aspect of the present application provides an AC bus renewable energy hydrogen production power supply device, including: a hydrogen production power supply component, the hydrogen production power supply component having first to third hydrogen production modes; a matching component for matching the optimal mode of the hydrogen production power supply component from the first to third hydrogen production modes according to a user budget, an expected service life and / or grid auxiliary service capabilities; and a control component for controlling the hydrogen production power supply component to produce hydrogen using AC bus renewable energy according to the optimal mode.

[0008] Optionally, in some embodiments, the hydrogen production power supply assembly includes a first multi-winding transformer; a diode bridge rectifier circuit connected to each secondary side of the first multi-winding transformer; a plurality of first electrolytic cells, each first electrolytic cell being connected in parallel to the DC side output ends of two diode bridge rectifier circuits; and a first Buck circuit connected to the output end of the diode bridge rectifier circuit.

[0009] Optionally, in some embodiments, the number of the first Buck circuits is determined by a ratio of a power of the diode bridge rectifier circuit to a power of the first Buck circuit.

[0010] Optionally, in some embodiments, the control component is also used to: when the hydrogen production power supply component is in the first hydrogen production mode, collect the DC voltage on the output side of the first Buck circuit; process the first difference between the DC voltage and the first preset voltage through a first PI controller to obtain a reference voltage of the first Buck circuit, and compare the reference voltage with a first preset carrier to generate a trigger signal of the IGBT in the first Buck circuit to control the first Buck circuit.

[0011] Optionally, in some embodiments, the hydrogen production power supply assembly includes: a second multi-winding transformer, the secondary side of the multi-winding transformer is connected to the input end of the thyristor rectifier circuit, wherein the thyristor rectifier circuit is obtained by connecting two 6-pulse thyristor rectifier circuits in series; a plurality of second electrolyzers, each second electrolyzer is connected to the input and output ends of the thyristor rectifier circuit.

[0012] Optionally, in some embodiments, the control assembly is further configured to: when the optimal mode is the second hydrogen production mode, collect the actual DC bus voltage; process the second difference between the actual DC bus voltage and the second preset voltage corresponding to the current gear of the second multi-winding transformer through a second PI (Proportion Integration) controller to generate the trigger angle of the thyristor, and convert the trigger angle of the thyristor into a pulse signal of the thyristor; input the third difference between the trigger angle of the thyristor and the trigger angle reference value into a third PI controller to obtain the gear adjustment amount of the second multi-winding transformer, so as to adjust the second multi-winding transformer according to the gear adjustment amount.

[0013] Optionally, in some embodiments, the hydrogen production power supply assembly includes a third multi-winding transformer; a plurality of basic power units, the input ends of the plurality of basic power units are all connected to the third multi-winding transformer; a third electrolyzer, the third electrolyzer is connected to the output ends of the plurality of basic power units.

[0014] Optionally, in some embodiments, each of the plurality of basic power units is obtained by connecting a three-phase converter and a second Buck circuit.

[0015] Optionally, in some embodiments, the control assembly is further configured to: when the hydrogen production power supply assembly is in the third hydrogen production mode, control the three-phase converter to adopt double closed-loop decoupling control, the d-axis controls the DC bus voltage, and the q-axis controls the reactive power or the effective value of the voltage at the AC bus connection point to a preset value; collect the DC voltage on the output side of the second Buck circuit; process the fourth difference between the DC voltage and the third preset voltage through a fourth PI controller to obtain the reference voltage of the fourth Buck circuit, and compare the reference voltage of the fourth Buck circuit with a second preset carrier wave to generate a trigger signal for the IGBT in the fourth Buck circuit, so as to control the second Buck circuit.

[0016] A control method for an AC bus renewable energy hydrogen production power supply device according to a second aspect of the present application includes the following steps: obtaining the user budget, the expected service life, and / or the grid ancillary service capacity; matching the optimal mode of the hydrogen production power supply component according to the user budget, the expected service life, and / or the grid ancillary service capacity; and controlling the hydrogen production power supply component to produce hydrogen using AC bus renewable energy according to the optimal mode.

[0017] Thus, through the hydrogen production power supply component, there are first to third hydrogen production modes; a matching component for matching the optimal mode of the hydrogen production power supply component from the first to third hydrogen production modes according to the user budget, the expected service life, and / or the grid ancillary service capacity; and a control component for controlling the hydrogen production power supply component to produce hydrogen using AC bus renewable energy according to the optimal mode. Thus, the problem of the lack of solutions for large-capacity renewable energy hydrogen production power supply systems is solved, providing a practical technical solution for the design and operation of large-scale renewable energy hydrogen production power supply devices, effectively reducing the cost of hydrogen production power supply devices in the field of renewable hydrogen production. It is expected that users can select from the proposed solutions according to their own requirements, promoting industrialization.

[0018] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0019] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the drawings, where:

[0020] Figure 1 A schematic diagram of the hydrogen production mode of the AC bus in the related art;

[0021] Figure 2 A block diagram of the AC bus renewable energy hydrogen production power supply device according to an embodiment of the present application;

[0022] Figure 3 A schematic diagram of the first hydrogen production mode according to an embodiment of the present application;

[0023] Figure 4 A schematic diagram of the second hydrogen production mode according to an embodiment of the present application;

[0024] Figure 5 A schematic diagram of the third hydrogen production mode according to an embodiment of the present application;

[0025] Figure 6 A flowchart of the generation of control instructions for the AC bus renewable energy hydrogen production power supply device according to an embodiment of the present application;

[0026] Figure 7 It is a flowchart of a method for producing hydrogen from renewable energy for an AC bus according to an embodiment of the present application. Detailed implementation manners

[0027] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as a limitation of the present application.

[0028] The AC bus renewable energy hydrogen production power supply device and its control method according to the embodiments of the present application will be described below with reference to the accompanying drawings. Aiming at solving the problem of the lack of solutions for existing large-capacity renewable energy hydrogen production power supply systems mentioned in the above background technology, the present application provides an AC bus renewable energy hydrogen production power supply device. In this device, through a hydrogen production power supply component, there are first to third hydrogen production modes; a matching component for matching the optimal mode of the hydrogen production power supply component from the first to third hydrogen production modes according to the user budget, expected service life, and / or grid auxiliary service capabilities; and a control component for controlling the hydrogen production power supply component to produce hydrogen using AC bus renewable energy according to the optimal mode. Thus, the problem of the lack of solutions for existing large-capacity renewable energy hydrogen production power supply systems is solved, providing a practical technical solution for the design and operation of large-scale renewable energy hydrogen production power supply devices, effectively reducing the cost of hydrogen production power supply devices in the field of renewable hydrogen production. It is expected that users can select from the proposed solutions according to their own requirements, promoting industrialization.

[0029] Specifically, Figure 2 It is a block diagram of an AC bus renewable energy hydrogen production power supply device provided by an embodiment of the present application.

[0030] As Figure 2 shown, the AC bus renewable energy hydrogen production power supply device 10 includes: a hydrogen production power supply component 100, a matching component 200, and a control component 300.

[0031] Among them, the hydrogen production power supply component 100 has first to third hydrogen production modes; the matching component 200 is used to match the optimal mode of the hydrogen production power supply component 100 from the first to third hydrogen production modes according to the user budget, expected service life, and / or grid auxiliary service capabilities; and the control component 300 is used to control the hydrogen production power supply component 100 to produce hydrogen using AC bus renewable energy according to the optimal mode.

[0032] Optionally, in some embodiments, the hydrogen production power supply assembly 100 includes a first multi-winding transformer; a diode bridge rectifier circuit correspondingly connected to each secondary side of the first multi-winding transformer; a plurality of first electrolyzers, each first electrolyzer being connected in parallel to the DC side output terminals of two diode bridge rectifier circuits; and a first Buck circuit connected to the output terminal of the diode bridge rectifier circuit.

[0033] Optionally, in some embodiments, the number of the first Buck circuits is determined by the ratio of the power of the diode bridge rectifier circuit to the power of the first Buck circuit.

[0034] Optionally, in some embodiments, the control assembly 300 is further configured to: when the hydrogen production power supply assembly 100 is in the first hydrogen production mode, collect the DC voltage on the output side of the first Buck circuit; process the first difference between the DC voltage and the first preset voltage through a first PI controller to obtain the reference voltage of the first Buck circuit, and compare the reference voltage with the first preset carrier wave to generate the trigger signal of the IGBT in the first Buck circuit, so as to control the first Buck circuit.

[0035] Specifically, Figure 3 FIG. shows a schematic diagram of the first hydrogen production mode. In the embodiments of the present application, a first multi-winding phase-shifting transformer (preferably with 1 primary side and 4 secondary sides) is adopted. Each secondary side is connected to 1 diode bridge rectifier circuit, and the DC side output terminals of every two bridge rectifier circuits are connected in parallel for one first electrolyzer to use. Since diodes are used as the front-stage rectification end, the embodiments of the present application do not require the primary side of the transformer to have an on-load voltage regulation function, and can ensure the relevant national standards of the AC grid connection group. To increase the DC output current level, multiple sets of the first Buck circuits at the rear stage are connected in parallel to the output terminal of the front-stage diode rectifier bridge. The number of Buck modules is determined by the ratio of the power of the bridge rectifier circuit to the power of the Buck module and a redundancy is reserved. A DC filter inductor is added to the output of the first Buck circuit to suppress the DC current fluctuation.

[0036] In the embodiments of the present application, the control assembly 300 collects the DC voltage on the output side of the first Buck circuit, subtracts it from the different DC voltage reference values of the load, and passes the error signal through a PI link to obtain the reference voltage of the first Buck circuit, and generates the trigger signal of the IGBT (Insulated Gate Bipolar Transistor) through carrier wave comparison. The IGBT trigger signals of multiple Buck modules connected to the same DC bus can reduce the DC current ripple through carrier phase shifting (360° / N). In addition, to further reduce the current ripple and the inductor volume and improve the fault tolerance and reliability, a three-phase interleaved Buck converter can also be adopted at the rear stage. At this time, the phase shift angle between the switches is 360° / N.

[0037] Optionally, in some embodiments, the hydrogen production power supply assembly 100 includes: a second multi-winding transformer, the secondary side of the multi-winding transformer is connected to the input end of the thyristor rectifier circuit, wherein the thyristor rectifier circuit is obtained by connecting two 6-pulse thyristor rectifier circuits in series; a plurality of second electrolyzers, each second electrolyzer is connected to the input and output ends of the thyristor rectifier circuit.

[0038] Optionally, in some embodiments, the control assembly 300 is further configured to: when the optimal mode is the second hydrogen production mode, collect the actual DC bus voltage; process the second difference between the actual DC bus voltage and the second preset voltage corresponding to the current gear of the second multi-winding transformer through a second PI controller to generate the trigger angle of the thyristor, and convert the trigger angle of the thyristor into a pulse signal of the thyristor; input the third difference between the trigger angle of the thyristor and the trigger angle reference value into a third PI controller to obtain the gear adjustment amount of the second multi-winding transformer, so as to adjust the second multi-winding transformer according to the gear adjustment amount.

[0039] Specifically, Figure 4 FIG. is a schematic diagram of the second hydrogen production mode. In the example of the present application, a single second electrolyzer is connected to the output end of a 12-pulse thyristor rectifier formed by connecting two 6-pulses in series. When two groups of 12-pulses work simultaneously, it is equivalent to 24-pulse rectification and is respectively connected to a secondary side of the second multi-winding transformer; this topology can enable a single second electrolyzer to operate to meet the national standard that the total harmonic distortion (THD) of the grid-connected current is less than 5%, and by reasonably controlling the on-load tap-changing gear of the primary side of the transformer, the power factor at the grid connection point is close to 1, thereby reducing the reactive power capacity of the transformer and lowering the hydrogen production cost.

[0040] In the embodiments of the present application, the main control objective of the control assembly 300 is to control the thyristor trigger angle to be close to zero to reduce the reactive power demand at the AC grid connection point when the second electrolyzer is at different DC voltage levels (i.e., gears or production capacity ranges (continuously adjustable from 20% - 100%)). By taking the difference between the actual DC bus voltage and the DC voltage reference value corresponding to the gear, generating the trigger angle through a second PI controller, and then converting it into a pulse signal of the thyristor; setting the trigger angle reference value to 0, taking the difference from the actual value of the trigger angle, and sending the result to a third PI controller to output the gear adjustment amount, which is used as the adjustment amount of the on-load tap-changing gear of the transformer. In addition, the mapping relationship between different DC bus voltage levels and the on-load tap-changing range of the transformer can also be determined through simulation and stored in the memory for use by the device operators.

[0041] Optionally, in some embodiments, the hydrogen production power supply assembly 100 includes a third multi-winding transformer; a plurality of basic power units, the input ends of the plurality of basic power units are all connected to the third multi-winding transformer; a third electrolyzer, the third electrolyzer is connected to the output ends of the plurality of basic power units.

[0042] Optionally, in some embodiments, multiple basic power units are obtained by connecting a three-phase converter and a second Buck circuit.

[0043] Optionally, in some embodiments, the control component 300 is further configured to: when the hydrogen production power supply component 100 is in the third hydrogen production mode, control the three-phase converter to adopt double closed-loop decoupling control, where the d-axis controls the DC bus voltage, and the q-axis controls the reactive power or the effective value of the voltage at the AC bus connection point to a preset value; collect the DC voltage on the output side of the second Buck circuit; process the fourth difference between the DC voltage and the third preset voltage through a fourth PI controller to obtain the reference voltage of the fourth Buck circuit, and compare the reference voltage of the fourth Buck circuit with a second preset carrier wave to generate the trigger signal of the IGBT in the fourth Buck circuit, so as to control the second Buck circuit.

[0044] Specifically, Figure 5 The schematic diagram showing the third hydrogen production mode. In the embodiments of the present application, a fully controlled two-level or three-level converter is connected back-to-back with the subsequent second Buck circuit as the basic power unit. First, the number of power units is determined according to the ratio of the total power of the hydrogen production station to the basic unit and redundancy is reserved; a power frequency transformer is used to obtain a low-voltage AC voltage for the front-stage fully controlled converter to access. Filter capacitors are added to the DC bus of each power unit to suppress the DC voltage fluctuation and achieve decoupling between the front and rear stages. A DC filter inductor is added to the output of the second Buck circuit to suppress the DC current fluctuation.

[0045] In the embodiments of the present application, the control component 300 is used to adopt double closed-loop decoupling control for the front-stage fully controlled AC / DC rectifier. The d-axis controls the DC bus voltage, and the q-axis controls the reactive power or the effective value of the voltage at the AC bus connection point to a given value. Therefore, it can ensure that the hydrogen production power supply is connected to the grid with a unity power factor during normal operation, and when a new energy power station experiences a fault ride-through, it can accept the grid dispatching instruction and provide rapid reactive power support to the grid; the control method of the subsequent Buck circuit is similar to the corresponding control method of the diode scheme; the reference voltage generates the pulse signal of each IGBT through the method of carrier comparison. For the three-phase rectifiers and the second Buck circuits of all power units, they can be phase-shifted by 360° / P according to the number of power units (P) to reduce the switching frequency harmonics at the AC connection point and the DC current harmonics on the output side.

[0046] In the embodiments of the present application, the user can make a reasonable selection from the three proposed AC bus renewable energy hydrogen production modes from perspectives such as budget, expected service life, or the ability to participate in grid ancillary services.

[0047] Among them, from the comparison of control complexity / difficulty, the first hydrogen production mode is less than the third hydrogen production mode which is less than the second hydrogen production mode;

[0048] In terms of construction cost, the third hydrogen production mode is higher than the first hydrogen production mode, which is much higher than the second hydrogen production mode;

[0049] In terms of power quality, theoretically all three can meet the national standards. However, for the first hydrogen production mode, since there is a dedicated control degree of freedom to control the reactive power of the AC grid connection point to 0 and the PWM equivalent frequency is relatively high, the power quality is the best;

[0050] From the perspective of comparing the response speeds of participating in power grid frequency modulation and voltage regulation, the third hydrogen production mode and the first hydrogen production mode are much higher than the second hydrogen production mode (but theoretically the second hydrogen production mode can meet the command changes at the 15-minute level. Limited by the response speed of the on-load tap changer, it cannot complete the emergency response at the second level);

[0051] From the perspective of comparing reliability and maintenance cost, the second hydrogen production mode is better than the first hydrogen production mode, which is better than the third hydrogen production mode;

[0052] From the perspective of comparing losses, the third hydrogen production mode is less than the first hydrogen production mode, which is less than the third hydrogen production mode;

[0053] From the perspective of comparing technical maturity, all three have the potential to be quickly put into practical applications;

[0054] From the perspective of comparing the control accuracy of the DC bus (the control accuracy of the DC bus has a relatively high impact on the normal operation of the electrolyzer), the third hydrogen production mode is slightly better than the first hydrogen production mode (the two are close) and higher than the second hydrogen production mode;

[0055] From the perspective of comparing the influence of suppressing the volatility of renewable energy on small-signal stability and the small-signal stability of the converter control system, the first hydrogen production mode is better than the second hydrogen production mode, which is better than the third hydrogen production mode.

[0056] Therefore, after the matching component 200 matches the optimal mode of the hydrogen production power supply component 100 from the first to the third hydrogen production modes according to the user's budget, expected service life, and / or grid auxiliary service capabilities, the control component 300 can control the hydrogen production power supply component 100 to produce hydrogen using the AC bus renewable energy according to the optimal mode. Figure 5 For the control instruction generation flowchart of the AC bus renewable energy hydrogen production power supply device, first collect the new energy output, then obtain the DC voltage of the electrolyzer, calculate the reference voltage of the converter, and finally generate the pulse signal.

[0057] To enable those skilled in the art to further understand the AC bus renewable energy hydrogen production power supply device of the present application embodiment, the following will be elaborated with specific embodiments.

[0058] The AC bus renewable energy hydrogen production power supply device of the present application embodiment can be designed and implemented according to the following steps.

[0059] Step 1: Selection of the hydrogen production power supply scheme using renewable energy.

[0060] After the contractor obtains the qualification to invest in building a hydrogen production station, based on indicators such as budget and expected lifespan, select a type from the three proposed hydrogen production schemes to determine the overall technical route.

[0061] Step 2: Simulation of the hydrogen production power supply scheme using renewable energy.

[0062] The contractor coordinates with the management agency of the power grid to be connected and contacts the converter / transformer manufacturer and the electrolyzer manufacturer to obtain the specific parameters of the three parties, form a detailed simulation model, and verify whether the power quality of the hydrogen production power supply connected to the grid, the overall system efficiency, the output-side DC bus voltage / current ripple, the participation in grid ancillary services and control methods and their response speeds, etc. in the selected technical route can meet the system operation requirements. If not, the converter / transformer manufacturer should be contacted first to adjust the customized parameters; if the converter / transformer manufacturer cannot meet the requirements, the contractor should consider changing the technical route or appropriately reducing the expected system operation standard.

[0063] Step 3: Commissioning of the hydrogen production power supply scheme using renewable energy.

[0064] Test whether the operating functions of the designed renewable energy hydrogen production device under different operating conditions meet the expectations; report the test results to the power grid management agency to confirm the ability of the hydrogen production station to participate in grid ancillary services or provide demand response; detect whether the power quality meets the corresponding national standards on the system side, and if not, additional power quality compensation devices need to be installed.

[0065] Step 4: Operation of the hydrogen production power supply scheme using renewable energy.

[0066] Collect information such as new energy output on a daily basis to arrange the daily hydrogen production plan, which is transformed into changes in the DC bus power level at different time periods; when receiving a system command, generate the reference voltage of each converter from the high / low voltage DC bus voltage levels and the grid connection point reactive power commands corresponding to the production plans of each time period and transform them into trigger signals, and send them to the IGBT / thyristor; when receiving a system shutdown command, block the pulses of all fully controlled devices and stop the calculation and acquisition functions of the remaining control system commands.

[0067] The hydrogen production power supply device for renewable energy on the AC bus according to the embodiment of the present application has a first to third hydrogen production mode through a hydrogen production power supply component; a matching component for matching the optimal mode of the hydrogen production power supply component from the first to third hydrogen production modes according to the user's budget, expected service life, and / or grid auxiliary service capacity; and a control component for controlling the hydrogen production power supply component to produce hydrogen using the renewable energy on the AC bus according to the optimal mode. Thus, the problem of the lack of solutions for large-capacity renewable energy hydrogen production power supply systems is solved, providing a practical technical solution for the design and operation of large-scale renewable energy hydrogen production power supply devices, effectively reducing the cost of hydrogen production power supply devices in the field of renewable hydrogen production. It is expected that users can select from the proposed solutions according to their own requirements, promoting industrialization.

[0068] Next, a control method for the hydrogen production power supply device for renewable energy on the AC bus according to the embodiment of the present application will be described with reference to the accompanying drawings.

[0069] Figure 7 It is a flowchart of the control method for the hydrogen production power supply device for renewable energy on the AC bus according to the embodiment of the present application.

[0070] As Figure 7 shown, the control method for the hydrogen production power supply device for renewable energy on the AC bus includes the following steps:

[0071] In step S701, the user's budget, expected service life, and / or grid auxiliary service capacity are obtained.

[0072] In step S702, the optimal mode of the hydrogen production power supply component is matched according to the user's budget, expected service life, and / or grid auxiliary service capacity.

[0073] In step S703, the hydrogen production power supply component is controlled to produce hydrogen using the renewable energy on the AC bus according to the optimal mode.

[0074] It should be noted that the foregoing explanation of the embodiment of the hydrogen production power supply device for renewable energy on the AC bus also applies to the control method for the hydrogen production power supply device for renewable energy on the AC bus in this embodiment, and will not be repeated here.

[0075] The control method of the AC bus renewable energy hydrogen production power supply device proposed according to the embodiments of the present application has a first to third hydrogen production mode through the hydrogen production power supply component; a matching component for matching the optimal mode of the hydrogen production power supply component from the first to third hydrogen production modes according to the user's budget, expected service life, and / or grid auxiliary service capacity; and a control component for controlling the hydrogen production power supply component to use the AC bus renewable energy to produce hydrogen according to the optimal mode. Thereby, the problem of the lack of solutions for existing large-capacity renewable energy hydrogen production power supply systems is solved, and a practical technical solution is provided for the design and operation of large-scale renewable energy hydrogen production power supply devices, effectively reducing the cost of hydrogen production power supply devices in the field of renewable hydrogen production. It is expected that users can select from the proposed solutions according to their own requirements, promoting industrialization.

[0076] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0077] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "N" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0078] Any process or method description shown in the flowchart or described in other ways herein can be understood as representing a module, segment, or part of code including one or more executable instructions for implementing a customized logical function or process. The scope of the preferred embodiments of the present application includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in a reverse order according to the involved functions, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0079] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or used in combination with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion (electronic device) having one or N wirings, a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then storing it in a computer memory.

[0080] It should be understood that various parts of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0081] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the method of implementing the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0082] In addition, each functional unit in various embodiments of the present application may be integrated into one processing module, or each unit may exist physically alone, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0083] The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disc, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

Claims

1. An AC bus renewable energy hydrogen production power supply device, characterized in that, Including: A hydrogen production power supply assembly, which has first to third hydrogen production modes; A matching assembly for matching the optimal mode of the hydrogen production power supply assembly from the first to third hydrogen production modes according to the user budget, expected service life, and / or grid auxiliary service capacity; And A control assembly for controlling the hydrogen production power supply assembly to produce hydrogen using AC bus renewable energy according to the optimal mode, The hydrogen production power supply assembly includes: A first multi-winding transformer; A diode bridge rectifier circuit correspondingly connected to each secondary side of the first multi-winding transformer; Multiple first electrolyzers, each first electrolyzer being connected in parallel to the DC side output terminals of two diode bridge rectifier circuits; A first Buck circuit connected to the output terminal of the diode bridge rectifier circuit; When the hydrogen production power supply assembly is in the first hydrogen production mode, collecting the DC voltage on the output side of the first Buck circuit; Processing the first difference between the DC voltage and a first preset voltage through a first PI controller to obtain the reference voltage of the first Buck circuit, and comparing the reference voltage with a first preset carrier wave to generate a trigger signal for the IGBT in the first Buck circuit to control the first Buck circuit; The hydrogen production power supply assembly includes: A second multi-winding transformer, the secondary side of the multi-winding transformer being connected to the input terminal of a thyristor rectifier circuit, where the thyristor rectifier circuit is obtained by connecting two 6-pulse thyristor rectifier circuits in series The control assembly is further configured to: When the optimal mode is the second hydrogen production mode, collecting the actual DC bus voltage; Processing the second difference between the actual DC bus voltage and a second preset voltage corresponding to the current gear of the second multi-winding transformer through a second PI controller to generate a trigger angle for the thyristor, and converting the trigger angle of the thyristor into a pulse signal of the thyristor; Inputting the third difference between the trigger angle of the thyristor and a trigger angle reference value into a third PI controller to obtain a gear adjustment amount for the second multi-winding transformer, so as to adjust the second multi-winding transformer according to the gear adjustment amount; The hydrogen production power supply assembly includes: A third multi-winding transformer; Multiple basic power units, the input terminals of the multiple basic power units being all connected to the third multi-winding transformer; A third electrolyzer, the third electrolyzer being connected to the output terminals of the multiple basic power units The control assembly is further configured to: When the hydrogen production power supply assembly is in the third hydrogen production mode, controlling the three-phase converter to adopt double closed-loop decoupling control, with the d-axis controlling the DC bus voltage and the q-axis controlling the reactive power or voltage effective value at the AC bus connection point to a preset value; Collecting the DC voltage on the output side of the second Buck circuit; Processing the fourth difference between the DC voltage and a third preset voltage through a fourth PI controller to obtain the reference voltage of the fourth Buck circuit, and comparing the reference voltage of the fourth Buck circuit with a second preset carrier wave to generate a trigger signal for the IGBT in the fourth Buck circuit to control the second Buck circuit.

2. The device according to claim 1, wherein The number of the first Buck circuits is determined by the ratio of the power of the diode bridge rectifier circuit to the power of the first Buck circuits.

3. The device according to claim 1, characterized in that, The multiple basic power units are all obtained by connecting a three-phase converter and a second Buck circuit.

4. A control method for a hydrogen production power supply device using renewable energy for an AC bus, characterized in that, Using the AC bus renewable energy hydrogen production power supply device according to claim 1, the method includes the following steps: Obtain the user budget, the expected service life, and / or the grid auxiliary service capacity; Match the optimal mode of the hydrogen production power supply component according to the user budget, the expected service life, and / or the grid auxiliary service capacity; and Control the hydrogen production power supply component to produce hydrogen using the AC bus renewable energy according to the optimal mode.

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