Multi-port isolation hydrogen production power supply device

Abstract

The invention discloses a multi-port isolation hydrogen production power supply device which comprises n unit modules connected in parallel, a first port, a second port, a third port and a fourth port, the first ports of the n unit modules are connected in parallel to form the first port, and the first port is connected with a photovoltaic system; the second ports of the n unit modules are connected in parallel and output three-phase alternating current after passing through the energy storage converter to form the second port which is connected with an alternating current power grid; the third ports of the n unit modules are connected in parallel to form a third port which is connected with an energy storage system; and the fourth ports of the n unit modules are connected in parallel to form the fourth port which is connected with a hydrogen production electrolytic bath. The power topology is integrated, and the structure is simple; each port can operate in two directions, the operation direction and power are flexibly configured, and the power stability of the hydrogen production electrolytic cell is effectively adjusted; the method has the advantages of low control complexity, high efficiency, high power density and the like.

Description

Technical Field

[0001] This invention relates to the field of hydrogen production technology, specifically a compact, high-efficiency, multi-port isolated hydrogen production power supply device. Background Technology

[0002] Hydrogen is a green and renewable energy source. Hydrogen storage technology is an energy storage technology developed using the interconversion of electricity, hydrogen, and electricity. Its basic principle is to electrolyze water to obtain hydrogen and oxygen, and then store the hydrogen on a large scale. Hydrogen production by water electrolysis has advantages such as high purity, pollution-free products, widely available raw materials, and a simple preparation process. In recent years, with the continuous decline in the cost of electricity from new energy sources such as photovoltaics, developing photovoltaic green energy hydrogen production technology in areas rich in solar energy resources can not only effectively absorb new energy sources but also significantly reduce the cost of hydrogen production through electrolysis.

[0003] Photovoltaic hydrogen production systems typically involve directly connecting solar photovoltaic panels to a hydrogen production power source, with the power source output directly connected to the hydrogen electrolyzer, resulting in a simple structure. However, unlike traditional power sources, photovoltaic and other green energy sources exhibit strong volatility. The intermittency and volatility of solar energy are inherent characteristics, making it difficult to achieve power balance between the photovoltaic system and the hydrogen electrolyzer. When the photovoltaic system's energy is insufficient, the electrolyzer needs to be shut down, requiring frequent switching in and out during operation, severely impacting the dynamic adaptability and operational reliability of the hydrogen electrolysis system. To dynamically maintain power balance in the hydrogen electrolyzer, current technologies typically employ a dual-power scheme of photovoltaic + grid power. This involves independent power supply from both the photovoltaic and grid sources to achieve a hybrid power supply mode, requiring multi-stage energy conversion and resulting in efficiency reduction. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a compact and highly efficient multi-port isolated hydrogen production power supply device that integrates inputs from photovoltaic, grid power, and energy storage systems. Each port can operate bidirectionally, and the operating direction and power of each port can be flexibly configured according to requirements. Dynamic adjustment ensures stable power of the hydrogen electrolyzer, thereby improving the power density and operating efficiency of the hydrogen production power supply device.

[0005] Therefore, the present invention adopts the following technical solution: a multi-port isolated hydrogen production power supply device, which includes n parallel unit modules, a first port, a second port, a third port and a fourth port;

[0006] The first ports of n unit modules are connected in parallel to form the first port, which is connected to the photovoltaic system; the second ports of n unit modules are connected in parallel to form the third port, which is connected to the AC power grid; the third ports of n unit modules are connected in parallel to form the third port, which is connected to the energy storage system; the fourth ports of n unit modules are connected in parallel to form the fourth port, which is connected to the hydrogen electrolyzer.

[0007] The four ports of the hydrogen production power supply device are connected by a symmetrical bidirectional full-bridge resonant converter and isolated by an isolation transformer. The DC power provided by the photovoltaic system is converted by the unit module and then supplied to the hydrogen electrolyzer. The AC grid and energy storage system are responsible for regulating the power stability of the hydrogen electrolyzer. When the photovoltaic system has excess energy, the corresponding symmetrical bidirectional full-bridge resonant converter operates in the forward direction, feeding power to the AC grid connected to the second port and charging the energy storage system connected to the third port. When the photovoltaic system has insufficient energy, the corresponding symmetrical bidirectional full-bridge resonant converter operates in the reverse direction, and the AC grid connected to the second port and the energy storage system connected to the third port supplement the hydrogen electrolyzer with electrical energy after being converted by the unit module.

[0008] Furthermore, the first port serves as an input port, where the DC voltage of the photovoltaic system is converted into a constant DC voltage after being connected to the unit module, and then stepped down to provide it to the hydrogen electrolyzer.

[0009] The second port serves as an input port, where the AC voltage from the AC power grid is converted into a constant DC voltage after being connected to the unit module, and then stepped down to supply the hydrogen electrolyzer; as an output port, the energy provided by the photovoltaic system is fed back to the AC power grid after power conversion.

[0010] The third port serves as an input port, where the DC voltage of the energy storage system is converted into a constant DC voltage after being connected to the unit module, and then stepped down to supply the hydrogen electrolyzer; it also serves as an output port, where the energy provided by the photovoltaic system is converted into power to charge the energy storage system.

[0011] The fourth port serves as an output port and is connected to the hydrogen electrolyzer.

[0012] Furthermore, each port of the hydrogen production power supply device can operate bidirectionally, and the operating direction and power of each port can be flexibly configured according to needs. The two operating modes of the hydrogen production power supply device are as follows: when the first port is connected to the photovoltaic input, the second, third, and fourth ports all serve as output ports, feeding power to the AC grid and charging the energy storage system, while providing energy to the hydrogen electrolyzer; when the photovoltaic input is not connected to the first port, the second and third ports can both serve as input ports for the output of the fourth port, so as to dynamically adjust the power balance of the hydrogen electrolyzer. The second and third ports have the ability to connect to photovoltaic, bus grid connection, energy storage, and fuel cells.

[0013] Furthermore, the power conversion units passing through the first port to the fourth port are, in sequence: DC / DC converter, symmetrical bidirectional full-bridge resonant converter, and first buck DC / DC converter.

[0014] Furthermore, the power conversion units passing through the second port to the fourth port are, in sequence: the three-phase rectifier circuit of the energy storage converter, the symmetrical bidirectional full-bridge resonant converter, and the first buck DC / DC converter.

[0015] Furthermore, the power conversion units passing through the third port to the fourth port are, in sequence: the second buck DC / DC converter, the symmetrical bidirectional full-bridge resonant converter, and the first buck DC / DC converter.

[0016] Furthermore, the power conversion units passing through the first port to the second port are, in sequence: a DC / DC converter, a symmetrical bidirectional full-bridge resonant converter, and a three-phase inverter circuit of an energy storage converter.

[0017] Furthermore, the power conversion units passing through the first port to the third port are, in sequence: a DC / DC converter, a symmetrical bidirectional full-bridge resonant converter, and a second buck DC / DC converter.

[0018] Furthermore, the multi-port isolated hydrogen production power supply device also includes a control module, which prioritizes controlling the DC power supplied by the photovoltaic system for DC conversion to power the hydrogen electrolyzer; when the energy provided by the photovoltaic system is insufficient, it controls the AC grid connected to the second port and the energy storage system connected to the third port to operate in reverse to provide supplementary electrical energy to the hydrogen electrolyzer; when the energy provided by the photovoltaic system exceeds the energy demand of the hydrogen electrolyzer, it controls the corresponding symmetrical bidirectional full-bridge resonant converter to operate in the forward direction to feed power to the AC grid connected to the second port and charge the energy storage system connected to the third port.

[0019] Furthermore, the multi-port isolated hydrogen production power supply device also includes a DC bus sampling unit connected to the control module, for monitoring the changing trend of the DC bus voltage and outputting it to the control module;

[0020] The control module inputs the changing trend of the DC bus voltage output by the DC bus sampling unit to control the energy provided by the photovoltaic system to reach a balance with the energy required by the hydrogen electrolyzer, or to control the DC bus voltage to be maintained at the photovoltaic MPPT operating point voltage.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. The present invention provides a multi-port isolated hydrogen production power supply device, in which each port can operate bidirectionally. The operating direction and power of each port can be flexibly configured according to requirements, which can effectively regulate the power stability of the hydrogen electrolyzer.

[0023] 2. The main topology of this invention adopts a two-stage DC-DC conversion method and has the MPPT control function of photovoltaic system, which effectively improves energy utilization.

[0024] 3. The main circuit of this invention is a symmetrical bidirectional full-bridge resonant converter with multi-port high-frequency magnetic integration, which effectively improves the power density, efficiency and controllability of the multi-port power electronic converter, making the multi-energy coupled hydrogen production system occupy less space and have higher overall efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a multi-port isolated hydrogen production power supply device according to the present invention;

[0026] Figure 2 This is a schematic diagram of the unit modules of the present invention;

[0027] Figure 3 This is another structural schematic diagram of the multi-port isolated hydrogen production power supply device of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the multi-port isolated hydrogen production power supply device of this invention will be further described in detail below with reference to the accompanying drawings.

[0029] Example 1

[0030] This embodiment provides a multi-port isolated hydrogen production power supply device, such as... Figure 1 As shown, it includes n parallel unit modules, a first port, a second port, a third port, and a fourth port.

[0031] The first ports of n unit modules are connected in parallel to form the first port, which is connected to the photovoltaic system; the second ports of n unit modules are connected in parallel to form the second port, which is connected to the AC power grid after passing through the energy storage converter; the third ports of n unit modules are connected in parallel to form the third port, which is connected to the energy storage system; the fourth ports of n unit modules are connected in parallel to form the fourth port, which is connected to the hydrogen electrolyzer.

[0032] The unit module, such as Figure 2 As shown, it includes a DC / DC converter, a bus support capacitor, a symmetrical bidirectional full-bridge resonant converter, an isolation transformer, a first DC / DC buck converter, and a second DC / DC buck converter.

[0033] The four ports of the hydrogen production power supply device are connected by a symmetrical bidirectional full-bridge resonant converter and isolated by an isolation transformer. The DC power provided by the photovoltaic system is converted by the unit module and then supplied to the hydrogen electrolyzer. The AC grid and energy storage system are responsible for regulating the power stability of the hydrogen electrolyzer. When the photovoltaic system has excess energy, the corresponding symmetrical bidirectional full-bridge resonant converter operates in the forward direction, feeding power to the AC grid connected to the second port and charging the energy storage system connected to the third port. When the photovoltaic system has insufficient energy, the corresponding symmetrical bidirectional full-bridge resonant converter operates in the reverse direction, and the AC grid connected to the second port and the energy storage system connected to the third port supplement the hydrogen electrolyzer with electrical energy after being converted by the unit module.

[0034] The first port serves as an input port. The DC voltage of the photovoltaic system is converted into a constant DC voltage after being connected to the unit module, and then stepped down to provide it to the hydrogen electrolyzer.

[0035] The second port serves as an input port, where the AC voltage from the AC power grid is converted into a constant DC voltage after being connected to the unit module, and then stepped down to supply the hydrogen electrolyzer; as an output port, the energy provided by the photovoltaic system is fed back to the AC power grid after power conversion.

[0036] The third port serves as an input port, where the DC voltage of the energy storage system is converted into a constant DC voltage after being connected to the unit module, and then stepped down to supply the hydrogen electrolyzer; it also serves as an output port, where the energy provided by the photovoltaic system is converted into power to charge the energy storage system.

[0037] The fourth port serves as an output port and is connected to the hydrogen electrolyzer.

[0038] Each port of the hydrogen production power supply device can operate bidirectionally, and the operating direction and power of each port can be flexibly configured according to needs. The two operating modes of the hydrogen production power supply device are as follows: when the first port is connected to the photovoltaic input, the second, third, and fourth ports all serve as output ports, feeding power to the AC grid and charging the energy storage system, while providing energy to the hydrogen electrolyzer; when the photovoltaic input is not connected to the first port, the second and third ports can both serve as input ports to supply the output of the fourth port, so as to dynamically adjust the power balance of the hydrogen electrolyzer. The second and third ports have the ability to connect to photovoltaic, bus grid connection, energy storage, and fuel cells.

[0039] The power conversion units passing through the first port to the fourth port are, in sequence: DC / DC converter, symmetrical bidirectional full-bridge resonant converter, and first buck DC / DC converter.

[0040] The power conversion units passing through the second port to the fourth port are, in sequence: the three-phase rectifier circuit of the energy storage converter, the symmetrical bidirectional full-bridge resonant converter, and the first step-down DC / DC converter.

[0041] The power conversion units passing through the third port to the fourth port are, in sequence: the second buck DC / DC converter, the symmetrical bidirectional full-bridge resonant converter, and the first buck DC / DC converter.

[0042] The power conversion units from the first port to the second port are, in sequence: a DC / DC converter, a symmetrical bidirectional full-bridge resonant converter, and a three-phase inverter circuit with an energy storage converter.

[0043] The power conversion units passing through the first port to the third port are, in sequence: DC / DC converter, symmetrical bidirectional full-bridge resonant converter, and second buck DC / DC converter.

[0044] Example 2

[0045] The structure of the multi-port isolated hydrogen production power supply device of the present invention is as follows: Figure 3 As shown, the device includes n parallel unit modules, four ports (first port, second port, third port, and fourth port), a control module, and a DC bus sampling unit connected to the control module. Each unit module includes a DC / DC converter, a bus support capacitor, a symmetrical bidirectional full-bridge resonant converter, a multi-winding isolation transformer, a first step-down DC / DC converter, and a second step-down DC / DC converter. The first ports of the n unit modules are connected in parallel to form the first port of the hydrogen production power supply, which is connected to a photovoltaic system. The second ports of the n unit modules are connected in parallel, and after passing through a PCS (Power Control System), they output three-phase AC power, forming the second port of the hydrogen production power supply, which is connected to the AC power grid. The third ports of the n unit modules are connected in parallel to form the third port of the hydrogen production power supply, which is connected to an energy storage system. The fourth ports of the n unit modules are connected in parallel to form the fourth port of the hydrogen production power supply, which is connected to a hydrogen electrolyzer. The four ports are connected via a symmetrical bidirectional full-bridge resonant converter (CLLC) and isolated by an isolation transformer. The hydrogen production power unit converts the DC power supplied by the photovoltaic system connected to the first port through a power conversion module, and then supplies power to the hydrogen electrolyzer connected to the fourth port. The AC grid and energy storage system are responsible for regulating the power stability of the hydrogen electrolyzer. When the photovoltaic system has excess energy, the corresponding symmetrical bidirectional full-bridge resonant converter operates in the forward direction, feeding power to the AC grid connected to the second port and charging the energy storage system connected to the third port. When the photovoltaic system has insufficient energy, the corresponding symmetrical bidirectional full-bridge resonant converter operates in the reverse direction, and the AC grid connected to the second port and the energy storage system connected to the third port replenish the hydrogen electrolyzer with electrical energy after power conversion by the unit module.

[0046] The method for determining the number of unit modules is as follows:

[0047] The number of unit modules depends primarily on the rated power of the hydrogen production power unit, and the unit modules are connected in parallel. Assume the rated power of the hydrogen production power unit is P. j The operating voltage range is U j_min ~U j_max The maximum effective current value of the power switching devices used in the unit module is Ij. Considering the requirement of 1.2 times short-time overpower operation of the hydrogen production power supply unit and the design margin k of the effective current value of the power switching devices, the required number of unit modules is calculated as follows:

[0048]

[0049] A schematic diagram of a single unit module is shown below. Figure 2 As shown, the ports are connected by a symmetrical bidirectional full-bridge resonant converter (CLLC) and isolated by a transformer.

[0050] The multi-port isolated hydrogen production power supply device allows each port to operate bidirectionally, with flexible configuration of the operating direction and power of each port according to requirements. The implementation process is as follows: the first port serves as the input port, connected to the photovoltaic system; the second and third ports can function as both input and output ports, with the second port connected to the AC grid and the third port connected to the energy storage system; the fourth port serves as the output port, connected to the hydrogen electrolyzer. Two common operating modes are: when the photovoltaic system connected to the first port has excess energy, the second, third, and fourth ports can all function as output ports, feeding energy to the grid and storing energy in the energy storage system, while simultaneously providing energy to the hydrogen electrolyzer; when the photovoltaic system connected to the first port has insufficient energy, the second and third ports can both function as input ports, supplying power to the fourth port's output, thus dynamically adjusting the power balance of the hydrogen electrolyzer.

[0051] The first port of the multi-port isolated hydrogen production power supply device is connected to a photovoltaic system as an input port. After the DC voltage from the photovoltaic system is input, it is first converted by a DC / DC converter to obtain a constant DC voltage. This constant DC voltage is then output as a constant DC voltage by a symmetrical bidirectional full-bridge resonant converter, simultaneously achieving electrical isolation between the photovoltaic system and the hydrogen electrolyzer. This constant DC voltage is then connected to a first step-down DC / DC converter to power the hydrogen electrolyzer connected to the fourth port. The control module within the multi-port isolated hydrogen production power supply device prioritizes controlling the DC power provided by the photovoltaic system for DC-DC conversion to power the hydrogen electrolyzer connected to the fourth port. When the energy provided by the photovoltaic system is insufficient, it controls the AC grid connected to the second port and the energy storage system connected to the third port to operate in reverse to provide supplementary power to the hydrogen electrolyzer. When the energy provided by the photovoltaic system exceeds the energy demand of the hydrogen electrolyzer, it controls the corresponding symmetrical bidirectional full-bridge resonant converter to operate in the forward direction, feeding power to the AC grid connected to the second port and charging the energy storage system connected to the third port. Simultaneously, the DC bus voltage after the DC voltage of the photovoltaic system is converted by the DC / DC converter is collected by the DC bus sampling unit, the changing trend of the DC bus voltage is monitored, and the result is output to the control module. The control module inputs the changing trend of the DC bus voltage to control the energy provided by the photovoltaic system to reach a balance with the energy required by the hydrogen electrolyzer, or to control the DC bus voltage to be maintained at the operating point voltage of the photovoltaic MPPT.

[0052] The second port of the multi-port isolated hydrogen production power supply device is connected to the AC power grid and can serve as both an input and output port. When the photovoltaic system connected to the first port of the multi-port isolated hydrogen production power supply device provides insufficient energy, the second port acts as an input port. The AC voltage from the AC power grid is rectified by the three-phase rectifier circuit of the energy storage converter to obtain a DC voltage. This DC voltage is then output as a constant DC voltage by a symmetrical bidirectional full-bridge resonant converter, simultaneously achieving electrical isolation between the AC power grid and the hydrogen electrolyzer. The constant DC voltage is then connected to the first step-down DC / DC converter to supply energy to the hydrogen electrolyzer connected to the fourth port. When the photovoltaic system connected to the first port of the multi-port isolated hydrogen production power supply device provides excess energy, the second port acts as an output port. The DC voltage from the photovoltaic system is first converted by a DC / DC converter to obtain a constant DC voltage. This constant DC voltage is then output as a constant DC voltage by a symmetrical bidirectional full-bridge resonant converter, simultaneously achieving electrical isolation between the photovoltaic system and the AC power grid. The constant DC voltage is then inverted by the three-phase inverter circuit of the energy storage converter (PCS) and fed back to the AC power grid.

[0053] The third port of the multi-port isolated hydrogen production power supply device is connected to the energy storage system and can serve as both an input and output port. When the photovoltaic system connected to the first port of the multi-port isolated hydrogen production power supply device provides insufficient energy, the third port acts as the input port. The DC voltage from the energy storage system is first converted by a second step-down DC / DC converter, and then output as a constant DC voltage by a symmetrical bidirectional full-bridge resonant converter. This constant DC voltage also serves to achieve electrical isolation between the energy storage system and the hydrogen electrolyzer. The constant DC voltage is then connected to a first step-down DC / DC converter to power the hydrogen electrolyzer connected to the fourth port. When the photovoltaic system connected to the first port of the multi-port isolated hydrogen production power supply device provides excess energy, the third port acts as the output port. The DC voltage from the photovoltaic system is first converted by a DC / DC converter to obtain a constant DC voltage. This constant DC voltage is then output as a constant DC voltage by a symmetrical bidirectional full-bridge resonant converter, simultaneously achieving electrical isolation between the photovoltaic system and the energy storage system. The constant DC voltage is then converted by a second step-down DC / DC converter to charge the energy storage system.

[0054] The fourth port of the multi-port isolated hydrogen production power supply device is connected to the hydrogen electrolyzer and serves as the output port.

[0055] The multi-port isolated hydrogen production power supply device may also include more ports, and the multi-winding isolation transformer may also include more windings.

[0056] The above embodiments are specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. A multi-port isolated hydrogen production power supply device, characterized in that, It includes n parallel unit modules, a first port, a second port, a third port, and a fourth port; The first ports of n unit modules are connected in parallel to form the first port, which is connected to the photovoltaic system; the second ports of n unit modules are connected in parallel to form the third port, which is connected to the AC power grid; the third ports of n unit modules are connected in parallel to form the third port, which is connected to the energy storage system; the fourth ports of n unit modules are connected in parallel to form the fourth port, which is connected to the hydrogen electrolyzer. The four ports of the hydrogen production power supply device are connected by a symmetrical bidirectional full-bridge resonant converter and isolated by an isolation transformer. The DC power provided by the photovoltaic system is converted by the unit module and then supplied to the hydrogen electrolyzer. The AC grid and energy storage system are responsible for regulating the power stability of the hydrogen electrolyzer. When the photovoltaic system has excess energy, the corresponding symmetrical bidirectional full-bridge resonant converter operates in the forward direction, feeding power to the AC grid connected to the second port and charging the energy storage system connected to the third port. When the photovoltaic system has insufficient energy, the corresponding symmetrical bidirectional full-bridge resonant converter operates in the reverse direction, and the AC grid connected to the second port and the energy storage system connected to the third port supplement the hydrogen electrolyzer with electrical energy after being converted by the unit module.

2. The multi-port isolated hydrogen production power supply device according to claim 1, characterized in that, The first port serves as an input port. The DC voltage of the photovoltaic system is converted into a constant DC voltage after being connected to the unit module, and then stepped down to provide it to the hydrogen electrolyzer. The second port serves as an input port, where the AC voltage from the AC power grid is converted into a constant DC voltage after being connected to the unit module, and then stepped down to supply the hydrogen electrolyzer; as an output port, the energy provided by the photovoltaic system is fed back to the AC power grid after power conversion. The third port serves as an input port, where the DC voltage of the energy storage system is converted into a constant DC voltage after being connected to the unit module, and then stepped down to supply the hydrogen electrolyzer; it also serves as an output port, where the energy provided by the photovoltaic system is converted into power to charge the energy storage system. The fourth port serves as an output port and is connected to the hydrogen electrolyzer.

3. The multi-port isolated hydrogen production power supply device according to claim 1, characterized in that, Each port of the hydrogen production power supply device can operate bidirectionally, and the operating direction and power of each port can be flexibly configured according to needs. The two operating modes of the hydrogen production power supply device are as follows: when the first port is connected to the photovoltaic input, the second, third, and fourth ports all serve as output ports, feeding power to the AC grid and charging the energy storage system, while providing energy to the hydrogen electrolyzer; when the photovoltaic input is not connected to the first port, the second and third ports can both serve as input ports to supply the output of the fourth port, so as to dynamically adjust the power balance of the hydrogen electrolyzer. The second and third ports have the ability to connect to photovoltaic, bus grid connection, energy storage, and fuel cells.

4. The multi-port isolated hydrogen production power supply device according to claim 1, characterized in that, The power conversion units passing through the first port to the fourth port are, in sequence: DC / DC converter, symmetrical bidirectional full-bridge resonant converter, and first buck DC / DC converter.

5. The multi-port isolated hydrogen production power supply device according to claim 1, characterized in that, The power conversion units passing through the second port to the fourth port are, in sequence: the three-phase rectifier circuit of the energy storage converter, the symmetrical bidirectional full-bridge resonant converter, and the first step-down DC / DC converter.

6. The multi-port isolated hydrogen production power supply device according to claim 1, characterized in that, The power conversion units passing through the third port to the fourth port are, in sequence: the second buck DC / DC converter, the symmetrical bidirectional full-bridge resonant converter, and the first buck DC / DC converter.

7. The multi-port isolated hydrogen production power supply device according to claim 1, characterized in that, The power conversion units from the first port to the second port are, in sequence: a DC / DC converter, a symmetrical bidirectional full-bridge resonant converter, and a three-phase inverter circuit with an energy storage converter.

8. The multi-port isolated hydrogen production power supply device according to claim 1, characterized in that, The power conversion units passing through the first port to the third port are, in sequence: DC / DC converter, symmetrical bidirectional full-bridge resonant converter, and second buck DC / DC converter.

9. The multi-port isolated hydrogen production power supply device according to any one of claims 1-8, characterized in that, It also includes a control module for prioritizing the DC power supplied by the photovoltaic system for DC-DC conversion to power the hydrogen electrolyzer; when the energy provided by the photovoltaic system is insufficient, controlling the AC grid connected to the second port and the energy storage system connected to the third port to operate in reverse to provide supplementary power to the hydrogen electrolyzer; when the energy provided by the photovoltaic system exceeds the energy demand of the hydrogen electrolyzer, controlling the corresponding symmetrical bidirectional full-bridge resonant converter to operate in the forward direction to feed power to the AC grid connected to the second port and charge the energy storage system connected to the third port.

10. The multi-port isolated hydrogen production power supply device according to claim 9, characterized in that, It also includes a DC bus sampling unit connected to the control module to monitor the changing trend of the DC bus voltage and output it to the control module; the control module inputs the changing trend of the DC bus voltage output by the DC bus sampling unit to control the energy provided by the photovoltaic system to reach a balance with the energy required by the hydrogen electrolyzer, or to control the DC bus voltage to be maintained at the photovoltaic MPPT operating point voltage.

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