Hydrogen production system and control method thereof

Abstract

The invention discloses a hydrogen production system and a control method of the hydrogen production system, and belongs to the technical field of hydrogen energy manufacturing, the hydrogen production system comprises a renewable energy power generation unit, a hydrogen production rectification power supply, an energy storage unit, an electrolytic bath and a control unit, the hydrogen production rectification power supply comprises an AC / DC converter and a bimodal DC / DC converter, the control unit is respectively in communication connection with the renewable energy power generation unit, the hydrogen production rectification power supply, the energy storage unit and the electrolytic bath; and the control unit is used for controlling the working modes of the AC / DC converter and the bimodal DC / DC converter by respectively sending control instructions to the AC / DC converter and the bimodal DC / DC converter according to the hydrogen production requirement, the actual generating capacity of the renewable energy power generation unit and the energy storage state of the energy storage unit. The control unit can realize dynamic energy management of the hydrogen production system by controlling the working modes of the AC / DC converter and the bimodal DC / DC converter, so that the electric energy conversion efficiency is improved, and the adaptability and reliability of the hydrogen production system are enhanced.

Description

Technical Field

[0001] This application belongs to the field of hydrogen energy production technology, and in particular relates to a hydrogen production system and a control method for the hydrogen production system. Background Technology

[0002] In related technologies, renewable energy power generation is affected by weather and geographical location, exhibiting significant intermittency and unpredictability. During certain periods, renewable energy systems may produce more electricity than the actual load demand, while at other times they may fail to meet basic needs. This supply-demand mismatch can easily lead to problems such as energy waste and low energy conversion efficiency. Summary of the Invention

[0003] This application proposes a hydrogen production system and a control method for the hydrogen production system to solve the problems of energy waste and low energy conversion efficiency caused by supply and demand mismatch in related technologies.

[0004] In a first aspect, this application provides a hydrogen production system, including: a renewable energy power generation unit, a hydrogen production rectifier power supply, an energy storage unit, an electrolyzer, and a control unit.

[0005] The renewable energy generation unit is connected to the AC common bus.

[0006] The hydrogen production rectifier power supply includes an AC / DC converter and a dual-mode DC / DC converter. The two ends of the AC / DC converter are respectively connected to the AC common bus and the DC common bus. The input end of the dual-mode DC / DC converter is connected to the DC common bus. The first output end of the dual-mode DC / DC converter is connected to the electrolyzer. The second output end of the dual-mode DC / DC converter is connected to the energy storage unit.

[0007] The control unit is communicatively connected to the renewable energy power generation unit, the hydrogen production rectifier power supply, the energy storage unit, and the electrolyzer, respectively.

[0008] The AC / DC converter is used to convert the AC input voltage into a DC common bus voltage in response to the control command of the control unit;

[0009] The dual-mode DC / DC converter is used to respond to the control command of the control unit and perform at least one of the following: transform the DC common bus voltage to output a DC voltage and current adapted to the electrolytic cell; control the charging and discharging state of the energy storage unit by changing the current flow direction between the energy storage unit and the DC common bus; cooperate with the energy storage unit to generate a DC bus voltage and convert the DC bus voltage into a voltage higher than the back EMF of the electrolytic cell;

[0010] The control unit is used to control the operating modes of the AC / DC converter and the dual-mode DC / DC converter by sending control commands to the AC / DC converter and the dual-mode DC / DC converter respectively, based on the hydrogen production demand, the actual power generation of the renewable energy power generation unit and the energy storage status of the energy storage unit.

[0011] The hydrogen production system provided in this application embodiment includes a control unit that, based on hydrogen production demand, the actual power generation of the renewable energy power generation unit, and the energy storage status of the energy storage unit, sends control commands to the AC / DC converter and the dual-mode DC / DC converter respectively. This controls the operating modes of the AC / DC converter and the dual-mode DC / DC converter. The dual-mode DC / DC converter acts as the main rectifier, regulating and delivering appropriate electrical energy to the electrolyzer to ensure efficient hydrogen production. Furthermore, in situations of energy surplus or shortage, the dual-mode DC / DC converter can automatically switch to energy storage charging and discharging management to achieve energy efficiency. The dynamic balancing and optimized utilization of energy greatly improves the flexibility and energy efficiency of the hydrogen production system. Furthermore, the dual-mode DC / DC converter can generate a voltage higher than the back electromotive force of the electrolyzer during system shutdown or AC input voltage interruption, preventing damage to the electrolyzer from reverse current and thus improving the reliability of the hydrogen production system. By switching operating modes to achieve dynamic energy management of the hydrogen production system, the power conversion efficiency is improved, enhancing the adaptability and reliability of the hydrogen production system, and significantly reducing implementation costs. This enhances the overall efficiency and safety of producing hydrogen using renewable energy sources such as solar and wind power.

[0012] According to one embodiment of this application, the dual-mode DC / DC converter includes a first DC / DC module and a second DC / DC module. The two ends of the first DC / DC module are respectively connected to the DC common bus and the electrolytic cell, and the two ends of the second DC / DC module are respectively connected to the DC common bus and the energy storage unit.

[0013] The first DC / DC module is used to respond to the control command of the control unit, transform the DC common bus voltage, and output DC voltage and current adapted to the electrolytic cell;

[0014] The second DC / DC module adopts a bidirectional DC / DC architecture and is used to control the charging and discharging state of the energy storage unit by changing the current flow direction between the energy storage unit and the DC common bus in response to the control command of the control unit.

[0015] Alternatively, the second DC / DC module is used to cooperate with the energy storage unit to generate a DC bus voltage, and the first DC / DC module is used to convert the DC bus voltage into a voltage higher than the back electromotive force of the electrolytic cell.

[0016] In the above technical solution, the dual-mode DC / DC converter outputs voltage and current to the electrolytic cell through the first DC / DC module, controls the charging and discharging state of the energy storage unit through the second DC / DC module, generates DC bus voltage through the cooperation of the second DC / DC module and the energy storage unit, and generates a voltage higher than the back EMF of the electrolytic cell through the first DC / DC module, thus realizing free switching between main rectification, energy storage management and polarization rectification. On the one hand, the first DC / DC module acts as the main rectifier, regulating and delivering appropriate electrical energy to the electrolyzer to ensure efficient hydrogen production. On the other hand, in cases of energy surplus or shortage, the second DC / DC module can intelligently switch to energy storage charging and discharging management, achieving dynamic energy balance and optimized utilization, greatly improving the system's flexibility and energy efficiency ratio. Furthermore, during system shutdowns or AC input voltage interruptions, the second DC / DC module collaborates with the energy storage unit to generate a DC bus voltage, while the first DC / DC module operates in polarized rectification mode, generating a voltage higher than the back EMF of the electrolyzer, preventing damage to the electrolyzer from reverse current and thus improving the reliability of the hydrogen production system.

[0017] According to one embodiment of this application, the control unit is used for:

[0018] When the actual power generation of the renewable energy power generation unit matches the hydrogen production demand, a first control command is sent to the AC / DC converter. The first control command is used to instruct the AC / DC converter to convert the AC input voltage to the DC common bus voltage. A second control command is sent to the dual-mode DC / DC converter. The second control command is used to instruct the first DC / DC module to operate in rectifier mode and the second DC / DC module to not operate.

[0019] The first DC / DC module operates in rectifier mode, including: the first DC / DC module transforms the DC common bus voltage and outputs DC voltage and current adapted to the electrolytic cell.

[0020] In the above technical solution, when the actual power generation of the renewable energy power generation unit matches the hydrogen production demand, and when the output of the renewable energy power generation unit is stable, the intervention of the energy storage battery can be avoided. The electrolysis process can be directly driven by the first DC / DC module of the hydrogen production rectifier power supply, which meets the high-efficiency hydrogen production demand of the electrolyzer while improving the energy conversion efficiency and the practicality of the hydrogen production system.

[0021] According to one embodiment of this application, the control unit is used for:

[0022] When the actual power generation of the renewable energy power generation unit does not match the hydrogen production demand, a third control command is sent to the dual-mode DC / DC converter. The third control command is used to instruct the first DC / DC module to operate in rectifier mode and to instruct the second DC / DC module to operate in energy storage regulation mode.

[0023] The first DC / DC module operates in rectifier mode, including: the first DC / DC module transforms the DC common bus voltage and outputs DC voltage and current adapted to the electrolytic cell;

[0024] The second DC / DC module operates in energy storage regulation mode, including: when the actual power generation of the renewable energy power generation unit is greater than the hydrogen production demand, the second DC / DC module controls the energy storage unit to charge and stores the excess electrical energy into the energy storage unit; when the actual power generation of the renewable energy power generation unit is less than the hydrogen production demand, the second DC / DC module controls the energy storage unit to discharge and the energy storage unit makes up the difference in power.

[0025] In the above technical solution, when the actual power generation of the renewable energy power generation unit does not match the hydrogen production demand, the control unit can adjust the working mode and parameters of the dual-mode converter in real time according to the actual output of the renewable energy power generation unit, the hydrogen production demand, and the energy storage status. It can calculate a suitable charging or discharging strategy based on real-time data and dynamically adjust the system so that the electrolyzer can operate continuously, maintain the energy supply and demand balance of the hydrogen production system, improve the autonomy and stability of the hydrogen production system, and achieve stable operation of the hydrogen production system under complex environmental changes and energy supply and demand fluctuations. This enables the hydrogen production system to maintain high-efficiency operation in diverse application scenarios and optimizes the energy utilization rate of the hydrogen production system.

[0026] According to one embodiment of this application, the control unit is used for:

[0027] In the event of a shutdown of the hydrogen production system or an interruption of the AC input voltage, a fourth control command is sent to the dual-mode DC / DC converter. This fourth control command instructs the first DC / DC module to operate in polarized rectification mode.

[0028] The first DC / DC module operates in polarized rectification mode, including: the first DC / DC module converts the first voltage established by the second DC / DC module and the energy storage unit on the DC common bus into a second voltage, the second voltage being higher than the remaining voltage across the electrolytic cell, and the second voltage being used to suppress the generation of reverse current in the electrolytic cell.

[0029] In the above technical solution, when the hydrogen production system shuts down or the AC input voltage is interrupted, the operating state of the first DC / DC converter is changed to enable it to function as a polarized rectifier. The second DC / DC module, combined with the energy storage unit, constructs a stable DC bus voltage to prevent reverse current from damaging the electrolyzer. This allows for electrolyzer protection without the need for additional independent hardware facilities when there is no external power supply, reducing implementation costs and maintenance costs of the hydrogen production system, lightening the weight and size of the hydrogen production system, and improving the integration and maintenance convenience of the hydrogen production system.

[0030] According to one embodiment of this application, the control unit is further configured to:

[0031] When the hydrogen production system returns to normal, a third control command is sent to the dual-mode DC / DC converter. The third control command is used to instruct the first DC / DC module to operate in rectifier mode and to instruct the second DC / DC module to operate in energy storage regulation mode.

[0032] In the above technical solution, when the hydrogen production system returns to normal, the control unit realizes efficient conversion, storage and flexible allocation of electrical energy by controlling the dual-mode DC / DC converter. It can be applied to different application scenarios, enabling the hydrogen production system to efficiently convert and distribute electrical energy under different operating conditions, reduce energy loss and improve the reliability, practicality and robustness of the hydrogen production system.

[0033] According to one embodiment of this application, the first DC / DC module includes at least one of the following topologies: buck single-phase Buck, multi-phase Buck, phase-shifted full-bridge, LLC resonant.

[0034] In the above technical solution, the first DC / DC module can adopt different topologies according to actual scenarios and needs, which has better applicability and flexibility.

[0035] According to one embodiment of this application, the second DC / DC module includes at least one of the following topologies: non-isolated bidirectional Buck / Boost, isolated bidirectional DAB, and bidirectional CLLC resonant.

[0036] In the above technical solution, the second DC / DC module can adopt different topologies according to actual scenarios and needs, which has better applicability and flexibility.

[0037] According to one embodiment of this application, the AC / DC converter includes at least one of the following topologies: two-level full bridge, three-level T-type, and three-level I-type.

[0038] In the above technical solutions, AC / DC converters can adopt different topologies according to actual scenarios and requirements, which has better applicability and flexibility.

[0039] Secondly, this application provides a control method for a hydrogen production system, applied to the hydrogen production system as described in the first aspect, the method comprising:

[0040] Based on the hydrogen production demand, the actual power generation of the renewable energy power generation unit, and the energy storage status of the energy storage unit, control commands are sent to the AC / DC converter and the dual-mode DC / DC converter respectively to control their operating modes.

[0041] In the above technical solution, the control unit, based on hydrogen production demand, the actual power generation of the renewable energy generation unit, and the energy storage status of the energy storage unit, sends control commands to the AC / DC converter and the dual-mode DC / DC converter respectively to control their operating modes. The dual-mode DC / DC converter acts as the main rectifier, regulating and delivering appropriate electrical energy to the electrolyzer to ensure efficient hydrogen production. Furthermore, in situations of energy surplus or shortage, the dual-mode DC / DC converter can automatically switch to energy storage charge / discharge management, realizing dynamic energy management. The dual-mode DC / DC converter achieves dynamic energy balance and optimized utilization, greatly improving the flexibility and energy efficiency of the hydrogen production system. Furthermore, it generates a voltage higher than the back electromotive force of the electrolyzer during system shutdown or AC input voltage interruption, preventing damage to the electrolyzer from reverse current and thus improving the reliability of the hydrogen production system. By switching operating modes to achieve dynamic energy management of the hydrogen production system, it improves power conversion efficiency, enhances the adaptability and reliability of the hydrogen production system, and significantly reduces implementation costs. This enhances the overall efficiency and safety of producing hydrogen from renewable energy sources such as solar and wind power.

[0042] According to one embodiment of this application, the step of controlling the operating modes of the AC / DC converter and the dual-mode DC / DC converter by sending control commands to the AC / DC converter and the dual-mode DC / DC converter respectively, based on hydrogen production demand, the actual power generation of the renewable energy power generation unit, and the energy storage status of the energy storage unit, includes:

[0043] In the event of a shutdown of the hydrogen production system or a loss of AC input voltage, a fourth control command is sent to the dual-mode DC / DC converter. The fourth control command is used to instruct the first DC / DC module of the dual-mode DC / DC converter to operate in polarized rectification mode.

[0044] The first DC / DC module operates in polarized rectification mode, including: the first DC / DC module converts the first voltage established by the second DC / DC module of the dual-mode DC / DC converter and the energy storage unit on the DC common bus into a second voltage, the second voltage being higher than the remaining voltage across the electrolytic cell, and the second voltage being used to suppress the generation of reverse current in the electrolytic cell.

[0045] In the above technical solution, when the hydrogen production system shuts down or the AC input voltage is interrupted, the operating state of the first DC / DC converter is changed to enable it to function as a polarized rectifier. The second DC / DC module, combined with the energy storage unit, constructs a stable DC bus voltage to prevent reverse current from damaging the electrolyzer. This allows for electrolyzer protection without the need for additional independent hardware facilities when there is no external power supply, reducing implementation costs and maintenance costs of the hydrogen production system, lightening the weight and size of the hydrogen production system, and improving the integration and maintenance convenience of the hydrogen production system.

[0046] Thirdly, this application provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the control method of the hydrogen production system as described in the second aspect.

[0047] Fourthly, this application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method for the hydrogen production system as described in the second aspect above.

[0048] Fifthly, this application provides a chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor being used to run programs or instructions to implement the control method of the hydrogen production system as described in the second aspect.

[0049] In a sixth aspect, this application provides a computer program product, including a computer program that, when executed by a processor, implements the control method for the hydrogen production system as described in the second aspect above.

[0050] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0051] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0052] Figure 1 This is one of the structural schematic diagrams of a hydrogen production system provided in the embodiments of this application;

[0053] Figure 2 This is a schematic diagram of the structure of a hydrogen production rectifier power supply provided in an embodiment of this application;

[0054] Figure 3 This is a flowchart of a control method for a hydrogen production system provided in an embodiment of this application;

[0055] Figure 4 This is a second schematic diagram of a hydrogen production system provided in an embodiment of this application;

[0056] Figure 5 This is a schematic diagram of an electronic device provided in an embodiment of this application.

[0057] Explanation of reference numerals in the attached figures:

[0058] 1: Hydrogen production system; 10: Renewable energy power generation unit; 20: Hydrogen production rectifier power supply;

[0059] 30: Energy storage unit; 40: Electrolyzer; 50: Control unit;

[0060] 60: Step-down transformer; 201: AC / DC converter; 202: Dual-mode DC / DC converter;

[0061] 2021: First DC / DC module; 2022: Second DC / DC module;

[0062] 500: Electronic device; 501: Processor; 502: Memory. Detailed Implementation

[0063] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0064] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0065] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0066] Against the backdrop of energy structure transformation, renewable energy, with its clean and sustainable characteristics, is gradually becoming a key option to replace fossil fuels. However, renewable energy power generation, especially solar and wind power, is significantly intermittent and unpredictable due to weather and geographical location. This means that at certain times, renewable energy systems may produce more electricity than local load demand, while at other times they may be unable to meet basic needs. This supply-demand mismatch not only wastes energy but also poses a serious challenge to grid stability.

[0067] To alleviate this problem, numerous research and technological innovations have focused on improving the storage and conversion efficiency of renewable energy. Among these, using surplus electricity to produce hydrogen through water electrolysis is a particularly promising method. Hydrogen energy is not only a high-energy-density clean energy source, but it can also be converted back into electricity through fuel cell technology, forming a closed-loop energy cycle system that effectively compensates for the discontinuity of renewable energy generation. However, this process is not without its obstacles, and several key technological challenges warrant in-depth discussion:

[0068] Power conversion efficiency: Traditional water electrolysis systems mostly rely on fixed DC power sources, which are inefficient for renewable energy power generation with large fluctuations. They are prone to unstable hydrogen production rates due to voltage fluctuations, increasing energy costs.

[0069] System compatibility and flexibility: Effective coupling between renewable energy power generation and hydrogen production systems requires addressing power quality matching issues, necessitating that the electrolyzer adapt to wide voltage input variations. Currently, most systems exhibit poor adaptability and struggle to meet dynamic adjustment requirements.

[0070] Electricity supply and demand balance: When renewable energy output exceeds demand, the excess electricity will be wasted if it cannot be effectively stored. While traditional battery storage is common, its capacity decays rapidly during frequent charge-discharge cycles, and its cost is also high. How to efficiently utilize this surplus electricity has become one of the factors restricting the economic efficiency of the system.

[0071] Equipment Protection Mechanism: As the core of the hydrogen production system, the safe operation of the electrolyzer is crucial. Due to the intermittent nature of renewable energy power generation, the water electrolysis hydrogen production system has to be frequently shut down. This frequent shutdown can lead to reverse currents in the highly ionicly conductive open-circuit pipes, reducing electrolysis efficiency, causing electrode degradation, and in severe cases, even damaging the electrolyzer. Existing protection measures are typically quite simple and fail to adequately consider the complexities of actual operating scenarios.

[0072] System integration and intelligent control: Efficiently integrating renewable energy generation, power conversion, energy storage, and hydrogen production, and achieving real-time intelligent management, is key to achieving high energy efficiency. However, many current systems suffer from low integration levels, limited automation, and a lack of adaptability to complex environments.

[0073] In summary, current renewable energy power generation and hydrogen production systems face numerous challenges in improving power conversion efficiency, achieving flexible matching between electricity and the system, maintaining dynamic balance between power supply and demand, establishing protection mechanisms for electrolyzers, and implementing intelligent system control. Solving these problems is crucial for promoting the effective utilization of renewable energy and fostering the development of the hydrogen economy.

[0074] To address the aforementioned problems, embodiments of this application provide a hydrogen production system and a control method for the hydrogen production system. The hydrogen production system and its control method provided in this application will be described in detail below with reference to the accompanying drawings and specific embodiments and application scenarios. The control method for the hydrogen production system can be applied to a terminal, and can be executed by hardware or software within the terminal.

[0075] Figure 1 This is one of the structural schematic diagrams of a hydrogen production system provided in an embodiment of this application. For example... Figure 1 As shown, the hydrogen production system 1 includes: a renewable energy power generation unit 10, a hydrogen production rectifier power supply 20, an energy storage unit 30, an electrolyzer 40, and a control unit 50.

[0076] It is easy to understand that the renewable energy generation unit 10 is connected to the AC common bus, and the renewable energy generation unit 10 may include components such as solar panel arrays and wind turbine generators.

[0077] The renewable energy generation unit 10, by adopting photovoltaic DC / AC inverter technology and wind power AC / AC frequency conversion regulation technology, can efficiently convert the electrical energy generated by distributed renewable energy into AC electrical energy with voltage and frequency matching.

[0078] Optionally, the hydrogen production system 1 can also integrate an automatic tracking device for solar radiation intensity and wind speed to achieve maximum power tracking of solar and wind energy, thereby improving the energy capture efficiency of the renewable energy power generation unit 10 to a better level.

[0079] The hydrogen production rectifier power supply 20 includes an AC / DC converter 201 and a dual-mode DC / DC converter 202. The two ends of the AC / DC converter 201 are connected to the AC common bus and the DC common bus, respectively. The input end of the dual-mode DC / DC converter 202 is connected to the DC common bus. The first output end of the dual-mode DC / DC converter 202 is connected to the electrolyzer, and the second output end of the dual-mode DC / DC converter 202 is connected to the energy storage unit.

[0080] It should be noted that the AC / DC converter 201 is the front-end section of the hydrogen production rectifier power supply 20. The AC / DC converter 201 is used to convert the AC input voltage into the DC common bus voltage in response to the control command of the control unit 50.

[0081] Optionally, the AC / DC converter 201 circuit can be a two-level full-bridge, a three-level "T" type, a three-level "I" type, or other topologies.

[0082] It is worth noting that the dual-mode DC / DC converter 202 is the downstream part of the hydrogen production rectifier power supply 20. The dual-mode DC / DC converter 202 is used to respond to the control command of the control unit 50 to perform at least one of the following: transform the DC common bus voltage to output a DC voltage and current adapted to the electrolyzer; control the charging and discharging state of the energy storage unit by changing the current flow direction between the energy storage unit and the DC common bus; cooperate with the energy storage unit to generate a DC bus voltage and convert the DC bus voltage into a voltage higher than the back EMF of the electrolyzer.

[0083] The control unit 50 is communicatively connected to the renewable energy power generation unit 10, the hydrogen production rectifier power supply 20, the energy storage unit 30, and the electrolyzer 40.

[0084] Optionally, the control unit 50 can be based on an industrial-grade PLC (Programmable Logic Controller) or an embedded computer, integrating SCADA (Supervisory Control and Data Acquisition) software to perform real-time data acquisition and analysis, and execute preset algorithm control logic.

[0085] Optionally, the control unit 50 can also be equipped with a cloud-based remote monitoring and fault warning system, supporting wireless communication protocols such as MQTT, to facilitate remote debugging and upgrades.

[0086] The control unit 50 is used to control the operating modes of the AC / DC converter and the dual-mode DC / DC converter by sending control commands to the AC / DC converter 201 and the dual-mode DC / DC converter 202 respectively, based on the hydrogen production demand, the actual power generation of the renewable energy power generation unit 10 and the energy storage status of the energy storage unit 30.

[0087] Optionally, the energy storage unit 30 can be an energy storage battery. For example, the energy storage unit 30 uses a lithium-ion battery pack, paired with a thermal management system to ensure the optimal operating temperature range. The battery management system is responsible for monitoring the battery health status, extending battery life, and optimizing the charging and discharging strategy to meet the dynamic balance of the system.

[0088] Optionally, the electrolytic cell 40 can be an alkaline electrolytic cell, a polymer electrolyte membrane (PEM) electrolytic cell, or a solid oxide electrolytic cell.

[0089] Optionally, the electrolytic cell 40 can also integrate temperature and pressure sensors, along with a feedback control strategy, to maintain better operating conditions.

[0090] The hydrogen production system provided in this application embodiment includes a control unit that, based on hydrogen production demand, the actual power generation of the renewable energy power generation unit, and the energy storage status of the energy storage unit, sends control commands to the AC / DC converter and the dual-mode DC / DC converter respectively. This controls the operating modes of the AC / DC converter and the dual-mode DC / DC converter. The dual-mode DC / DC converter acts as the main rectifier, regulating and delivering appropriate electrical energy to the electrolyzer to ensure efficient hydrogen production. Furthermore, in situations of energy surplus or shortage, the dual-mode DC / DC converter can automatically switch to energy storage charging and discharging management to achieve energy efficiency. The dynamic balancing and optimized utilization of energy greatly improves the flexibility and energy efficiency of the hydrogen production system. Furthermore, the dual-mode DC / DC converter can generate a voltage higher than the back electromotive force of the electrolyzer during system shutdown or AC input voltage interruption, preventing damage to the electrolyzer from reverse current and thus improving the reliability of the hydrogen production system. By switching operating modes to achieve dynamic energy management of the hydrogen production system, the power conversion efficiency is improved, enhancing the adaptability and reliability of the hydrogen production system, and significantly reducing implementation costs. This enhances the overall efficiency and safety of producing hydrogen using renewable energy sources such as solar and wind power.

[0091] Figure 2 This is a schematic diagram of the structure of a hydrogen production rectifier power supply 20 provided in an embodiment of this application, as shown below. Figure 2As shown, the hydrogen production rectifier power supply 20 includes an AC / DC converter 201 and a dual-mode DC / DC converter 202. The dual-mode DC / DC converter 202 includes a first DC / DC module 2021 and a second DC / DC module 2022. The two ends of the first DC / DC module 2021 are respectively connected to the DC common bus and the electrolyzer, and the two ends of the second DC / DC module 2022 are respectively connected to the DC common bus and the energy storage unit.

[0092] The first DC / DC module 2021 is used to respond to the control command of the control unit to transform the DC common bus voltage and output DC voltage and current adapted to the electrolytic cell;

[0093] The second DC / DC module 2022 adopts a bidirectional DC / DC architecture and is used to control the charging and discharging state of the energy storage unit by changing the current flow direction between the energy storage unit and the DC common bus in response to the control command of the control unit.

[0094] Alternatively, the second DC / DC module 2022 is used to cooperate with the energy storage unit to generate a DC bus voltage, and the first DC / DC module 2021 is used to convert the DC bus voltage into a voltage higher than the back EMF of the electrolytic cell.

[0095] The first DC / DC module, acting as the main rectifier, is used to respond to control commands from the control unit, transform the DC common bus voltage, and output DC voltage and current that are compatible with the electrolytic cell.

[0096] Optionally, the first DC / DC module circuit can be a buck single-phase Buck, multi-phase Buck, phase-shifted full-bridge, LLC resonant, or other topologies.

[0097] Optionally, the first DC / DC module can also be equipped with an advanced PWM (Pulse Width Modulation) controller with a built-in PID (Proportional-Integral-Derivative) control loop to adjust the duty cycle in real time, output DC voltage and current that are compatible with the electrolytic cell, and quickly respond to load changes to achieve dynamic adjustment.

[0098] The second DC / DC module adopts a bidirectional DC / DC architecture to respond to the control commands of the control unit and control the charging and discharging state of the energy storage unit by changing the current flow direction between the energy storage unit and the DC common bus.

[0099] Optionally, the second DC / DC module can adopt a bidirectional DC / DC architecture. The circuit of the second DC / DC module can be a non-isolated bidirectional Buck / Boost, an isolated bidirectional DAB (Dual Active Bridge), a bidirectional CLLC resonant topology, etc., which can realize seamless switching between charging and discharging modes. It has a built-in BMS (Battery Management System) and SOC (State of Charge) algorithm to accurately detect and control the charging and discharging state of the energy storage battery.

[0100] Optionally, the second DC / DC module is used to cooperate with the energy storage unit to generate a DC bus voltage. Correspondingly, the first DC / DC module is used to convert the DC bus voltage into a voltage higher than the back EMF of the electrolyzer, so that the electrolyzer will not be damaged by reverse current during system shutdown or AC input voltage interruption, thereby improving the reliability of the hydrogen production system.

[0101] In the above technical solution, the dual-mode DC / DC converter outputs voltage and current to the electrolytic cell through the first DC / DC module, controls the charging and discharging state of the energy storage unit through the second DC / DC module, generates DC bus voltage through the cooperation of the second DC / DC module and the energy storage unit, and generates a voltage higher than the back EMF of the electrolytic cell through the first DC / DC module, thus realizing free switching between main rectification, energy storage management and polarization rectification. On the one hand, the first DC / DC module acts as the main rectifier, regulating and delivering appropriate electrical energy to the electrolyzer to ensure efficient hydrogen production. On the other hand, in cases of energy surplus or shortage, the second DC / DC module can intelligently switch to energy storage charging and discharging management, achieving dynamic energy balance and optimized utilization, greatly improving the system's flexibility and energy efficiency ratio. Furthermore, during system shutdowns or AC input voltage interruptions, the second DC / DC module collaborates with the energy storage unit to generate a DC bus voltage, while the first DC / DC module operates in polarized rectification mode, generating a voltage higher than the back EMF of the electrolyzer, preventing damage to the electrolyzer from reverse current and thus improving the reliability of the hydrogen production system.

[0102] In one embodiment of this application, the control unit is used for:

[0103] When the actual power generation of the renewable energy power generation unit matches the hydrogen production demand, a first control command is sent to the AC / DC converter. The first control command is used to instruct the AC / DC converter to convert the AC input voltage to the DC common bus voltage. A second control command is sent to the dual-mode DC / DC converter. The second control command is used to instruct the first DC / DC module to operate in rectifier mode and the second DC / DC module to not operate.

[0104] The first DC / DC module operates in rectifier mode, including: the first DC / DC module transforms the DC common bus voltage and outputs DC voltage and current adapted to the electrolytic cell.

[0105] It's easy to understand that, assuming the actual power generation from renewable energy generation units matches the hydrogen production demand, the primary goal of the hydrogen production system is to maximize the conversion of electrical energy from these units into hydrogen. The system automatically adjusts based on actual hydrogen production needs to ensure the electrolyzer operates at maximum efficiency.

[0106] The control unit sends a first control command to the AC / DC converter, which instructs the AC / DC converter to convert the AC input voltage to the DC common bus voltage. The AC / DC converter of the hydrogen production rectifier power supply converts the unstable AC power (such as solar or wind power) provided by renewable energy sources into stable DC power and establishes voltage on the DC common bus.

[0107] The control unit sends a second control command to the dual-mode DC / DC converter. The second control command is used to instruct the first DC / DC module to operate in rectifier mode and the second DC / DC module to not operate, thereby enabling the hydrogen production system to enter normal hydrogen production mode.

[0108] It should be noted that the first DC / DC module operates in rectifier mode, including: the first DC / DC module converts the DC common bus voltage to DC current adapted to the electrolyzer, and precisely controls the output DC voltage and current to meet the high-efficiency hydrogen production requirements of the electrolyzer, and outputs DC voltage and current adapted to the electrolyzer.

[0109] In the above technical solution, when the actual power generation of the renewable energy power generation unit matches the hydrogen production demand, and when the output of the renewable energy power generation unit is stable, the intervention of the energy storage battery can be avoided. The electrolysis process can be directly driven by the first DC / DC module of the hydrogen production rectifier power supply, which meets the high-efficiency hydrogen production demand of the electrolyzer while improving the energy conversion efficiency and the practicality of the hydrogen production system.

[0110] In one embodiment of this application, the control unit is used for:

[0111] When the actual power generation of the renewable energy power generation unit does not match the hydrogen production demand, a third control command is sent to the dual-mode DC / DC converter. The third control command is used to instruct the first DC / DC module to operate in rectifier mode and to instruct the second DC / DC module to operate in energy storage regulation mode.

[0112] The first DC / DC module operates in rectifier mode, including: the first DC / DC module transforms the DC common bus voltage and outputs DC voltage and current adapted to the electrolytic cell;

[0113] The second DC / DC module operates in energy storage regulation mode, including: when the actual power generation of the renewable energy power generation unit is greater than the hydrogen production demand, the second DC / DC module controls the energy storage unit to charge and stores the excess electrical energy into the energy storage unit; when the actual power generation of the renewable energy power generation unit is less than the hydrogen production demand, the second DC / DC module controls the energy storage unit to discharge and the energy storage unit makes up the difference in power.

[0114] It is easy to understand that when the actual power generation of the renewable energy power generation unit does not match the hydrogen production demand, the control unit sends a third control command to the dual-mode DC / DC converter. The third control command is used to instruct the first DC / DC module to work in rectifier mode and to instruct the second DC / DC module to work in energy storage regulation mode, thereby enabling the hydrogen production system to enter the energy balance mode.

[0115] The first DC / DC module operates in rectifier mode, including: the first DC / DC module converts the DC common bus voltage and outputs DC voltage and current adapted to the electrolytic cell;

[0116] The second DC / DC module operates in energy storage regulation mode, including: when the actual power generation of the renewable energy power generation unit is greater than or equal to the hydrogen production demand, the second DC / DC module operates in buck charging mode to control the charging of the energy storage unit and store the excess power into the energy storage battery; when the actual power generation of the renewable energy power generation unit is less than or equal to the hydrogen production demand, the second DC / DC module operates in boost discharging mode to control the discharging of the energy storage unit, and the energy storage battery makes up the difference in power. The energy storage unit smooths out power fluctuations and ensures the continuous operation of the electrolyzer.

[0117] In the above technical solution, when the actual power generation of the renewable energy power generation unit does not match the hydrogen production demand, the control unit can adjust the working mode and parameters of the dual-mode converter in real time according to the actual output of the renewable energy power generation unit, the hydrogen production demand, and the energy storage status. It can calculate a suitable charging or discharging strategy based on real-time data and dynamically adjust the system so that the electrolyzer can operate continuously, maintain the energy supply and demand balance of the hydrogen production system, improve the autonomy and stability of the hydrogen production system, and achieve stable operation of the hydrogen production system under complex environmental changes and energy supply and demand fluctuations. This enables the hydrogen production system to maintain high-efficiency operation in diverse application scenarios and optimizes the energy utilization rate of the hydrogen production system.

[0118] In one embodiment of this application, the control unit is used for:

[0119] In the event of a shutdown of the hydrogen production system or an interruption of the AC input voltage, a fourth control command is sent to the dual-mode DC / DC converter. This fourth control command instructs the first DC / DC module to operate in polarized rectification mode.

[0120] The first DC / DC module operates in polarized rectification mode, including: the first DC / DC module converts the first voltage established by the second DC / DC module and the energy storage unit on the DC common bus into a second voltage, the second voltage being higher than the remaining voltage across the electrolytic cell, and the second voltage being used to suppress the generation of reverse current in the electrolytic cell.

[0121] In the event of a shutdown of the hydrogen production system or a loss of AC input voltage, the control unit sends a fourth control command to the dual-mode DC / DC converter. The fourth control command is used to instruct the first DC / DC module to operate in polarized rectification mode.

[0122] It should be noted that when the external AC input is interrupted, the first DC / DC module no longer works as the main rectifier. The hydrogen production system uses the voltage established by the second DC / DC module and the energy storage battery on the DC common bus to switch to polarized rectification control.

[0123] The first DC / DC module operates in polarized rectification mode, including: the first DC / DC module converts the first voltage established by the second DC / DC module and the energy storage unit on the DC common bus into a second voltage. The second voltage is higher than the remaining voltage across the electrolytic cell. The second voltage is used to suppress the generation of reverse current in the electrolytic cell and protect the electrolytic cell from damage.

[0124] It is worth noting that when the hydrogen production system shuts down, it enters a low-power standby state, maintaining only necessary monitoring and protection circuits while waiting for external conditions to recover. It quickly resumes normal operation when conditions permit.

[0125] In the above technical solution, when the hydrogen production system shuts down or the AC input voltage is interrupted, the operating state of the first DC / DC converter is changed to enable it to function as a polarized rectifier. The second DC / DC module, combined with the energy storage unit, constructs a stable DC bus voltage to prevent reverse current from damaging the electrolyzer. This allows for electrolyzer protection without the need for additional independent hardware facilities when there is no external power supply, reducing implementation costs and maintenance costs of the hydrogen production system, lightening the weight and size of the hydrogen production system, and improving the integration and maintenance convenience of the hydrogen production system.

[0126] In one embodiment of this application, the control unit is further configured to:

[0127] When the hydrogen production system returns to normal, a third control command is sent to the dual-mode DC / DC converter. The third control command is used to instruct the first DC / DC module to operate in rectifier mode and to instruct the second DC / DC module to operate in energy storage regulation mode.

[0128] It is easy to understand that when the hydrogen production system returns to normal, the control unit sends a third control command to the dual-mode DC / DC converter. The third control command is used to instruct the first DC / DC module to operate in rectifier mode and to instruct the second DC / DC module to operate in energy storage regulation mode, thereby enabling the hydrogen production system to enter energy balance mode.

[0129] Optionally, when the hydrogen production system returns to normal, the control unit is also used to send a first control command to the AC / DC converter and a second control command to the dual-mode DC / DC converter, thereby enabling the hydrogen production system to enter the normal hydrogen production mode.

[0130] The control unit controls the operating mode of the hydrogen production system based on the actual power generation of the renewable energy power generation unit and the hydrogen production demand.

[0131] In the above technical solution, when the hydrogen production system returns to normal, the control unit realizes efficient conversion, storage and flexible allocation of electrical energy by controlling the dual-mode DC / DC converter. It can be applied to different application scenarios, enabling the hydrogen production system to efficiently convert and distribute electrical energy under different operating conditions, reduce energy loss and improve the reliability, practicality and robustness of the hydrogen production system.

[0132] In one embodiment of this application, the first DC / DC module includes at least one of the following topologies: buck single-phase Buck, multi-phase Buck, phase-shifted full-bridge, and LLC resonant.

[0133] Optionally, when the topology of the first DC / DC module is a buck single-phase Buck converter, the first DC / DC module can control the average value of the input voltage through a single switch, thereby controlling the output voltage.

[0134] Optionally, when the topology of the first DC / DC module is multiphase Buck, the multiphase Buck can use multiple parallel single-phase Buck circuits, which can improve current capability and efficiency.

[0135] Optionally, when the topology of the first DC / DC module is a phase-shifted full-bridge, the first DC / DC module achieves current balance and harmonic suppression by alternately controlling the switches in multiple full-bridge circuits, thereby reducing the stress and power loss of the switching devices.

[0136] Optionally, when the topology of the first DC / DC module is LLC resonance, LLC resonance combines the advantages of inductor-capacitor filtering and resonant circuits, and has high efficiency, low electromagnetic interference, wide input-output range and good dynamic response.

[0137] In the above technical solution, the first DC / DC module can adopt different topologies according to actual scenarios and needs, which has better applicability and flexibility.

[0138] In one embodiment of this application, the second DC / DC module includes at least one of the following topologies: non-isolated bidirectional Buck / Boost, isolated bidirectional DAB, and bidirectional CLLC resonant.

[0139] Optionally, when the topology of the second DC / DC module is a non-isolated bidirectional Buck / Boost, the power can be stepped down by controlling the switching transistor when the input voltage is higher than the output voltage; conversely, it can be stepped up by appropriate control methods.

[0140] Optionally, when the topology type of the second DC / DC module is an isolated bidirectional DAB, high-efficiency bidirectional power conversion can be achieved by using two full-bridge topologies and high-frequency transformers to isolate the input and output.

[0141] Optionally, when the topology of the second DC / DC module is bidirectional CLLC resonance, the CLLC resonance topology combines the characteristics of inductor-capacitor and capacitor-inductor circuits, achieving a balance between high efficiency and low electromagnetic interference.

[0142] In the above technical solution, the second DC / DC module can adopt different topologies according to actual scenarios and needs, which has better applicability and flexibility.

[0143] In one embodiment of this application, the AC / DC converter includes at least one of the following topologies: two-level full-bridge, three-level T-type, and three-level I-type.

[0144] Optionally, when the AC / DC converter topology is a two-level full-bridge, it consists of three full-bridge circuits composed of six switches, with each full-bridge including two switching transistors. By properly controlling these switching transistors, the power conversion between the input and output can be achieved.

[0145] Optionally, when the AC / DC converter topology is a three-level T-type, each phase consists of four switching transistors and two capacitors, forming a T-shaped structure. With appropriate switching control, it is possible to switch between two voltage levels (positive, zero, and negative), thereby producing a smoother output waveform than a two-level topology.

[0146] Optionally, when the AC / DC converter is a three-level 1-word topology, each phase consists of four switching transistors and two clamping diodes, which can generate three different voltage levels (positive, zero, and negative), enabling smooth switching between different voltages to achieve efficient power conversion and reduce electromagnetic interference.

[0147] In the above technical solutions, AC / DC converters can adopt different topologies according to actual scenarios and requirements, which has better applicability and flexibility.

[0148] This application also provides a control method for a hydrogen production system. Figure 3 This is a flowchart of a control method for a hydrogen production system provided in an embodiment of this application, such as... Figure 3 As shown, the control method of the hydrogen production system includes step 310.

[0149] Step 310: Based on the hydrogen production demand, the actual power generation of the renewable energy power generation unit, and the energy storage status of the energy storage unit, control the operating modes of the AC / DC converter and the dual-mode DC / DC converter by sending control commands to them respectively.

[0150] Figure 4 This is a second schematic diagram of a hydrogen production system provided in an embodiment of this application, as shown below. Figure 4 As shown, the hydrogen production system 1 includes a renewable energy power generation unit 10, a hydrogen production rectifier power supply 20, an energy storage unit 30, an electrolyzer 40, a control unit 50, and a step-down transformer 60.

[0151] It should be noted that the step-down transformer 60 converts the AC side DC bus voltage (e.g., 33KV) into a voltage that matches the hydrogen production rectifier power supply (e.g., 500-600V).

[0152] In the above technical solution, the control unit, based on hydrogen production demand, the actual power generation of the renewable energy generation unit, and the energy storage status of the energy storage unit, sends control commands to the AC / DC converter and the dual-mode DC / DC converter respectively to control their operating modes. The dual-mode DC / DC converter acts as the main rectifier, regulating and delivering appropriate electrical energy to the electrolyzer to ensure efficient hydrogen production. Furthermore, in situations of energy surplus or shortage, the dual-mode DC / DC converter can automatically switch to energy storage charge / discharge management, realizing dynamic energy management. The dual-mode DC / DC converter achieves dynamic energy balance and optimized utilization, greatly improving the flexibility and energy efficiency of the hydrogen production system. Furthermore, it generates a voltage higher than the back electromotive force of the electrolyzer during system shutdown or AC input voltage interruption, preventing damage to the electrolyzer from reverse current and thus improving the reliability of the hydrogen production system. By switching operating modes to achieve dynamic energy management of the hydrogen production system, it improves power conversion efficiency, enhances the adaptability and reliability of the hydrogen production system, and significantly reduces implementation costs. This enhances the overall efficiency and safety of producing hydrogen from renewable energy sources such as solar and wind power.

[0153] In one embodiment of this application, the step of controlling the operating modes of the AC / DC converter and the dual-mode DC / DC converter by sending control commands to the AC / DC converter and the dual-mode DC / DC converter respectively, based on hydrogen production demand, the actual power generation of the renewable energy power generation unit, and the energy storage status of the energy storage unit, includes:

[0154] In the event of a shutdown of the hydrogen production system or a loss of AC input voltage, a fourth control command is sent to the dual-mode DC / DC converter. The fourth control command is used to instruct the first DC / DC module of the dual-mode DC / DC converter to operate in polarized rectification mode.

[0155] The first DC / DC module operates in polarized rectification mode, including: the first DC / DC module converts the first voltage established by the second DC / DC module of the dual-mode DC / DC converter and the energy storage unit on the DC common bus into a second voltage, the second voltage being higher than the remaining voltage across the electrolytic cell, and the second voltage being used to suppress the generation of reverse current in the electrolytic cell.

[0156] In the above technical solution, when the hydrogen production system shuts down or the AC input voltage is interrupted, the operating state of the first DC / DC converter is changed to enable it to function as a polarized rectifier. The second DC / DC module, combined with the energy storage unit, constructs a stable DC bus voltage to prevent reverse current from damaging the electrolyzer. This allows for electrolyzer protection without the need for additional independent hardware facilities when there is no external power supply, reducing implementation costs and maintenance costs of the hydrogen production system, lightening the weight and size of the hydrogen production system, and improving the integration and maintenance convenience of the hydrogen production system.

[0157] Optionally, the control method for the hydrogen production system further includes:

[0158] When the hydrogen production system returns to normal, a third control command is sent to the dual-mode DC / DC converter. The third control command is used to instruct the first DC / DC module to operate in rectifier mode and to instruct the second DC / DC module to operate in energy storage regulation mode.

[0159] Optionally, the dual-mode DC / DC converter includes a first DC / DC module and a second DC / DC module. The two ends of the first DC / DC module are respectively connected to the DC common bus and the electrolytic cell, and the two ends of the second DC / DC module are respectively connected to the DC common bus and the energy storage unit.

[0160] The first DC / DC module is used to respond to the control command of the control unit, transform the DC common bus voltage, and output DC voltage and current adapted to the electrolytic cell;

[0161] The second DC / DC module adopts a bidirectional DC / DC architecture and is used to control the charging and discharging state of the energy storage unit by changing the current flow direction between the energy storage unit and the DC common bus in response to the control command of the control unit.

[0162] Optionally, the control method for the hydrogen production system further includes:

[0163] When the actual power generation of the renewable energy power generation unit matches the hydrogen production demand, a first control command is sent to the AC / DC converter. The first control command is used to instruct the AC / DC converter to convert the AC input voltage to the DC common bus voltage. A second control command is sent to the dual-mode DC / DC converter. The second control command is used to instruct the first DC / DC module to operate in rectifier mode and the second DC / DC module to not operate.

[0164] The first DC / DC module operates in rectifier mode, including: the first DC / DC module transforms the DC common bus voltage and outputs DC voltage and current adapted to the electrolytic cell.

[0165] Optionally, the control method for the hydrogen production system further includes:

[0166] When the actual power generation of the renewable energy power generation unit does not match the hydrogen production demand, a third control command is sent to the dual-mode DC / DC converter. The third control command is used to instruct the first DC / DC module to operate in rectifier mode and to instruct the second DC / DC module to operate in energy storage regulation mode.

[0167] The first DC / DC module operates in rectifier mode, including: the first DC / DC module transforms the DC common bus voltage and outputs DC voltage and current adapted to the electrolytic cell;

[0168] The second DC / DC module operates in energy storage regulation mode, including: when the actual power generation of the renewable energy power generation unit is greater than the hydrogen production demand, the second DC / DC module controls the energy storage unit to charge and stores the excess electrical energy into the energy storage unit; when the actual power generation of the renewable energy power generation unit is less than the hydrogen production demand, the second DC / DC module controls the energy storage unit to discharge and the energy storage unit makes up the difference in power.

[0169] Optionally, the first DC / DC module includes at least one of the following topologies: buck single-phase Buck, multi-phase Buck, phase-shifted full-bridge, LLC resonant.

[0170] Optionally, the second DC / DC module includes at least one of the following topologies: non-isolated bidirectional Buck / Boost, isolated bidirectional DAB, and bidirectional CLLC resonant.

[0171] Optionally, the AC / DC converter includes at least one of the following topologies: two-level full-bridge, three-level T-type, and three-level I-type.

[0172] For an understanding of the control method of the above hydrogen production system, please refer to the description in the aforementioned hydrogen production system embodiments, which can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0173] The control unit in this application embodiment can be implemented in software or in hardware. When implemented in hardware, it can be implemented by a processor, which can include general-purpose processors, special-purpose processors, etc., such as central processing unit (CPU), microprocessor, digital signal processor (DSP), artificial intelligence (AI) processor, graphics processing unit (GPU), application specific integrated circuit (ASIC), network processor (NP), field-programmable gate array (FPGA), or other programmable logic devices, gate circuits, transistors, discrete hardware components, etc.

[0174] In some embodiments, such as Figure 5 As shown, this application embodiment also provides an electronic device 500, including a processor 501, a memory 502, and a computer program stored in the memory 502 and executable on the processor 501. When the program is executed by the processor 501, it implements the various processes of the control method embodiment of the hydrogen production system described above and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0175] This application also provides a non-transitory computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the various processes of the control method embodiment of the hydrogen production system described above and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0176] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0177] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the control method of the hydrogen production system described above.

[0178] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0179] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the control method embodiment of the hydrogen production system described above, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0180] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0181] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0182] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0183] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

[0184] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0185] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A hydrogen production system, characterized in that, include: Renewable energy power generation unit, hydrogen production rectifier power supply, energy storage unit, electrolyzer and control unit, The renewable energy generation unit is connected to the AC common bus. The hydrogen production rectifier power supply includes an AC / DC converter and a dual-mode DC / DC converter. The two ends of the AC / DC converter are respectively connected to the AC common bus and the DC common bus. The input end of the dual-mode DC / DC converter is connected to the DC common bus. The first output end of the dual-mode DC / DC converter is connected to the electrolyzer. The second output end of the dual-mode DC / DC converter is connected to the energy storage unit. The control unit is communicatively connected to the renewable energy power generation unit, the hydrogen production rectifier power supply, the energy storage unit, and the electrolyzer, respectively. The AC / DC converter is used to convert the AC input voltage into a DC common bus voltage in response to the control command of the control unit; The dual-mode DC / DC converter is used to respond to the control command of the control unit and perform at least one of the following: transform the DC common bus voltage to output a DC voltage and current adapted to the electrolytic cell; control the charging and discharging state of the energy storage unit by changing the current flow direction between the energy storage unit and the DC common bus; cooperate with the energy storage unit to generate a DC bus voltage and convert the DC bus voltage into a voltage higher than the back EMF of the electrolytic cell; The control unit is used to control the operating modes of the AC / DC converter and the dual-mode DC / DC converter by sending control commands to the AC / DC converter and the dual-mode DC / DC converter respectively, based on the hydrogen production demand, the actual power generation of the renewable energy power generation unit and the energy storage status of the energy storage unit.

2. The hydrogen production system according to claim 1, characterized in that, The dual-mode DC / DC converter includes a first DC / DC module and a second DC / DC module. The two ends of the first DC / DC module are respectively connected to the DC common bus and the electrolytic cell, and the two ends of the second DC / DC module are respectively connected to the DC common bus and the energy storage unit. The first DC / DC module is used to respond to the control command of the control unit, transform the DC common bus voltage, and output DC voltage and current adapted to the electrolytic cell; The second DC / DC module adopts a bidirectional DC / DC architecture and is used to control the charging and discharging state of the energy storage unit by changing the current flow direction between the energy storage unit and the DC common bus in response to the control command of the control unit. Alternatively, the second DC / DC module is used to cooperate with the energy storage unit to generate a DC bus voltage, and the first DC / DC module is used to convert the DC bus voltage into a voltage higher than the back electromotive force of the electrolytic cell.

3. The hydrogen production system according to claim 2, characterized in that, The control unit is used for: When the actual power generation of the renewable energy power generation unit matches the hydrogen production demand, a first control command is sent to the AC / DC converter. The first control command is used to instruct the AC / DC converter to convert the AC input voltage to the DC common bus voltage. A second control command is sent to the dual-mode DC / DC converter. The second control command is used to instruct the first DC / DC module to operate in rectifier mode and the second DC / DC module to not operate. The first DC / DC module operates in rectifier mode, including: the first DC / DC module transforms the DC common bus voltage and outputs DC voltage and current adapted to the electrolytic cell.

4. The hydrogen production system according to claim 2, characterized in that, The control unit is used for: When the actual power generation of the renewable energy power generation unit does not match the hydrogen production demand, a third control command is sent to the dual-mode DC / DC converter. The third control command is used to instruct the first DC / DC module to operate in rectifier mode and to instruct the second DC / DC module to operate in energy storage regulation mode. The first DC / DC module operates in rectifier mode, including: the first DC / DC module transforms the DC common bus voltage and outputs DC voltage and current adapted to the electrolytic cell; The second DC / DC module operates in energy storage regulation mode, including: when the actual power generation of the renewable energy power generation unit is greater than the hydrogen production demand, the second DC / DC module controls the energy storage unit to charge and stores the excess electrical energy into the energy storage unit; when the actual power generation of the renewable energy power generation unit is less than the hydrogen production demand, the second DC / DC module controls the energy storage unit to discharge and the energy storage unit makes up the difference in power.

5. The hydrogen production system according to any one of claims 2-4, characterized in that, The control unit is used for: In the event of a shutdown of the hydrogen production system or an interruption of the AC input voltage, a fourth control command is sent to the dual-mode DC / DC converter. This fourth control command instructs the first DC / DC module to operate in polarized rectification mode. The first DC / DC module operates in polarized rectification mode, including: the first DC / DC module converts the first voltage established by the second DC / DC module and the energy storage unit on the DC common bus into a second voltage, the second voltage being higher than the remaining voltage across the electrolytic cell, and the second voltage being used to suppress the generation of reverse current in the electrolytic cell.

6. The hydrogen production system according to claim 5, characterized in that, The control unit is also used for: When the hydrogen production system returns to normal, a third control command is sent to the dual-mode DC / DC converter. The third control command is used to instruct the first DC / DC module to operate in rectifier mode and to instruct the second DC / DC module to operate in energy storage regulation mode.

7. The hydrogen production system according to any one of claims 2-4 and 6, characterized in that, The first DC / DC module includes at least one of the following topologies: buck single-phase Buck, multi-phase Buck, phase-shifted full-bridge, LLC resonant.

8. The hydrogen production system according to any one of claims 2-4 and 6, characterized in that, The second DC / DC module includes at least one of the following topologies: non-isolated bidirectional Buck / Boost, isolated bidirectional DAB, and bidirectional CLLC resonant.

9. The hydrogen production system according to any one of claims 1-4 and 6, characterized in that, The AC / DC converter includes at least one of the following topologies: two-level full bridge, three-level T-type, and three-level I-type.

10. A control method for a hydrogen production system, characterized in that, Applied to a hydrogen production system as described in any one of claims 1-9, the method comprises: Based on the hydrogen production demand, the actual power generation of the renewable energy power generation unit, and the energy storage status of the energy storage unit, control commands are sent to the AC / DC converter and the dual-mode DC / DC converter respectively to control their operating modes.

11. The control method for the hydrogen production system according to claim 10, characterized in that, The step of controlling the operating modes of the AC / DC converter and the dual-mode DC / DC converter by sending control commands to the AC / DC converter and the dual-mode DC / DC converter respectively, based on hydrogen production demand, the actual power generation of the renewable energy power generation unit, and the energy storage status of the energy storage unit, includes: In the event of a shutdown of the hydrogen production system or a loss of AC input voltage, a fourth control command is sent to the dual-mode DC / DC converter. The fourth control command is used to instruct the first DC / DC module of the dual-mode DC / DC converter to operate in polarized rectification mode. The first DC / DC module operates in polarized rectification mode, including: the first DC / DC module converts the first voltage established by the second DC / DC module of the dual-mode DC / DC converter and the energy storage unit on the DC common bus into a second voltage, the second voltage being higher than the remaining voltage across the electrolytic cell, and the second voltage being used to suppress the generation of reverse current in the electrolytic cell.

12. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the control method for the hydrogen production system as described in any one of claims 10-11.

Images