CN-122001232-A - Multi-component isomerism hydrogen production power supply and control method

CN122001232ACN 122001232 ACN122001232 ACN 122001232ACN-122001232-A

Abstract

The specification relates to the technical field of power electronics, in particular to a multi-component heterogeneous hydrogen production power supply and a control method. The power supply includes a main branch and an auxiliary branch. The main branch includes a first rectifying circuit and a Buck converter. The input end of the first rectifying circuit is connected with a first output winding of the transformer, the output end of the first rectifying circuit is connected with the input end of the Buck converter, the output end of the Buck converter is connected with the first end of the direct current bus, and the main branch is used for providing steady-state power. The first rectifying circuit is an uncontrolled rectifying circuit. The auxiliary branch comprises a second rectifying circuit and a full-bridge circuit. The input end of the second rectifying circuit is connected with a second output winding of the transformer, the output end of the second rectifying circuit is connected with the input end of the full-bridge circuit, the output end of the full-bridge circuit is connected with the first end of the direct current bus, and the auxiliary branch is used for transmitting fluctuating power or alternating current excitation. Embodiments of the present description may balance between steady state high efficiency and dynamic fast response.

Inventors

LIU JUN
WANG GUANGCHUN
LEI ZHENYUAN
ZHOU ZUXU
WANG JIE

Assignees

中电建新能源集团股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (15)

1. The multi-component heterogeneous hydrogen production power supply is characterized by comprising a main branch and an auxiliary branch; The main branch comprises a first rectifying circuit and a Buck converter, wherein the input end of the first rectifying circuit is connected with a first output winding of the transformer, the output end of the first rectifying circuit is connected with the input end of the Buck converter, the output end of the Buck converter is connected with a first end of a direct current bus, the main branch is used for providing steady-state power for the direct current bus, and the first rectifying circuit is an uncontrolled rectifying circuit; The auxiliary branch comprises a second rectifying circuit and a full-bridge circuit, the input end of the second rectifying circuit is connected with a second output winding of the transformer, the output end of the second rectifying circuit is connected with the input end of the full-bridge circuit, the output end of the full-bridge circuit is connected with the first end of the direct current bus, the auxiliary branch is used for transmitting fluctuating power or alternating current excitation, the second end of the direct current bus is connected with a load, and the load is a hydrogen production electrolytic tank.
2. The multi-component hydrogen production power supply according to claim 1, wherein the input winding of the transformer is connected with a power grid, and the full-bridge circuit is an IGBT full-bridge circuit.
3. The multi-component hydrogen production power supply according to claim 1, wherein the transformer is a phase-shifting transformer, the main branch comprises a plurality of first rectifying circuits, the input ends of the plurality of first rectifying circuits are connected with a plurality of first output windings of the phase-shifting transformer, and the output ends of the plurality of first rectifying circuits are connected with the input end of the Buck converter.
4. The multi-component hydrogen production power supply of claim 1, wherein the main branch comprises a plurality of Buck converters, the output of the first rectifying circuit is connected to the input of the plurality of Buck converters, and the output of the plurality of Buck converters is connected to the first end of the dc bus.
5. A control method for a multi-component hydrogen production power supply according to any one of claims 1 to 4, comprising: acquiring a load electrical signal of the load; Determining a target working mode of the multi-element heterogeneous hydrogen production power supply according to the load electric signal; and controlling the Buck converter and the full-bridge circuit according to the target working mode.
6. The method of claim 5, wherein the step of determining the position of the probe is performed, The determining the working mode of the multi-heterogeneous hydrogen production power supply comprises the following steps: Selecting a target condition in a condition set based on the load electrical signal, The condition set comprises a plurality of conditions, and the conditions in the condition set correspond to the working mode of the multi-heterogeneous hydrogen production power supply; The target working mode is a working mode corresponding to the target condition.
7. The method of claim 5, wherein the target operating mode is a steady state mode; The control of the Buck converter and the full-bridge circuit includes: Controlling the first output voltage of the Buck converter to be unchanged; And controlling a switching tube in the full-bridge circuit to be turned off.
8. The method of claim 7, wherein the load electrical signal comprises a load voltage and a load current; The determining the target working mode of the multi-heterogeneous hydrogen production power supply comprises the following steps: Determining a voltage change index according to the load voltage, and determining a current change index according to the load current; And when the voltage change index is smaller than or equal to a first threshold value and the current change index is smaller than or equal to a second threshold value, determining that the target working mode of the multi-heterogeneous hydrogen production power supply is a steady-state mode.
9. The method of claim 5, wherein the method further comprises: Acquiring a first output current of the Buck converter and a second output current of the full-bridge circuit; The control of the Buck converter and the full-bridge circuit includes: Calculating bus reference current of the direct current bus according to the load electrical signal and a preset reference voltage; Distributing the bus reference current to the main branch and the auxiliary branch according to a power distribution coefficient to obtain a first branch reference current of the main branch and a second branch reference current of the auxiliary branch; And controlling the Buck converter so that the first output current of the Buck converter reaches the first branch reference current, and controlling the full-bridge circuit so that the second output current of the full-bridge circuit reaches the second branch reference current.
10. The method of claim 9, wherein the target operating mode is a dynamic adjustment mode, the power distribution coefficient is a preset power distribution coefficient, the load electrical signal comprises a load voltage and a load current; The determining the target working mode of the multi-heterogeneous hydrogen production power supply comprises the following steps: Determining a voltage change index according to the load voltage, and determining a current change index according to the load current; and determining that the target working mode of the multi-heterogeneous hydrogen production power supply is a dynamic regulation mode when at least one of the voltage change index is larger than or equal to a third threshold value and the current change index is larger than or equal to a fourth threshold value.
11. The method of claim 9, wherein the target operating mode is a hybrid modulation mode, the power distribution coefficient is obtained by searching in a power distribution coefficient set according to the load voltage, or the power distribution coefficient is obtained by calculating according to the load voltage; The determining the target working mode of the multi-heterogeneous hydrogen production power supply comprises the following steps: Determining a voltage change index according to the load voltage, and determining a current change index according to the load current; And determining that the target working mode of the multi-heterogeneous hydrogen production power supply is a mixed modulation mode when at least one of the voltage change index is larger than the first threshold and smaller than the third threshold, and the current change index is larger than the second threshold and smaller than the fourth threshold is met.
12. The method of claim 5, wherein the target operating mode is a failure mode; The control of the Buck converter and the full-bridge circuit includes: The switching tube in the Buck converter is controlled to be turned off; And controlling a switching tube in the full-bridge circuit to be turned off.
13. The method of claim 12, wherein the load electrical signal comprises a load voltage and a load current, and wherein determining the target operating mode of the multi-heterogeneous hydrogen-producing power supply comprises: And determining the target working mode of the multi-heterogeneous hydrogen production power supply as a fault mode when at least one of load voltage is smaller than or equal to a voltage threshold value and load current is larger than or equal to a current threshold value is met.
14. The method of claim 5, wherein the target operating mode is an electrically stimulated superposition mode; The control of the Buck converter and the full-bridge circuit includes: determining a base voltage and an excitation voltage of the load; Controlling the Buck converter to enable the first output voltage of the Buck converter to reach the base voltage; and controlling the full-bridge circuit to enable the second output voltage of the full-bridge circuit to reach the excitation voltage.
15. The method of claim 14, wherein the load is a hydrogen production electrolyzer, the load electrical signal comprises a load voltage and a load current, and the determining the target operating mode of the multi-component hydrogen production power source comprises: Determining a voltage change index according to the load voltage, and determining a current change index according to the load current; And determining that the target working mode of the multi-heterogeneous hydrogen production power supply is an electric excitation superposition mode when at least one of the voltage change index is larger than or equal to a third threshold value, the voltage change index is larger than the first threshold value and smaller than the third threshold value, the current change index is larger than or equal to a fourth threshold value, and the current change index is larger than the second threshold value and smaller than the fourth threshold value.

Description

Multi-component isomerism hydrogen production power supply and control method Technical Field The specification relates to the technical field of power electronics, in particular to a multi-component heterogeneous hydrogen production power supply and a control method. Background With the development of new energy technology, a power supply system plays an increasingly important role in the field of power electronics as a key link of energy conversion. In particular, in high-power application scenes such as hydrogen production systems, higher requirements are put on the efficiency, reliability and control flexibility of the power supply system. In the related art, implementations of a power supply system include an Insulated Gate Bipolar Transistor (IGBT) scheme and a diode scheme. In the insulated gate bipolar transistor scheme, a PWM (Pulse Width Modulation ) rectifying circuit constituted by an insulated gate bipolar transistor is employed. However, the on-state loss of the insulated gate bipolar transistor is large, resulting in lower energy conversion efficiency and higher cost of the power supply system. In the diode scheme, a diode first rectifying circuit is employed. However, the output voltage of the diode scheme is not controllable, resulting in poor dynamic response of the multi-heterogeneous hydrogen generation power supply. How to achieve balance between high steady-state efficiency and dynamic quick response is a technical problem to be solved currently. Disclosure of Invention Embodiments of the present disclosure provide a multi-component heterogeneous hydrogen generation power supply and control method to balance between steady-state high efficiency and dynamic fast response. The embodiment of the specification provides a multi-isomerism hydrogen production power supply, which comprises a main branch and an auxiliary branch; The main branch comprises a first rectifying circuit and a Buck converter, wherein the input end of the first rectifying circuit is connected with a first output winding of the transformer, the output end of the first rectifying circuit is connected with the input end of the Buck converter, the output end of the Buck converter is connected with a first end of a direct current bus, the main branch is used for providing steady-state power for the direct current bus, and the first rectifying circuit is an uncontrolled rectifying circuit; The auxiliary branch comprises a second rectifying circuit and a full-bridge circuit, the input end of the second rectifying circuit is connected with a second output winding of the transformer, the output end of the second rectifying circuit is connected with the input end of the full-bridge circuit, the output end of the full-bridge circuit is connected with the first end of the direct current bus, the auxiliary branch is used for transmitting fluctuating power or alternating current excitation, the second end of the direct current bus is connected with a load, and the load is a hydrogen production electrolytic tank. In some embodiments, the input winding of the transformer is connected with a power grid, and the full-bridge circuit is an IGBT full-bridge circuit. In some embodiments, the transformer is a phase-shifting transformer, the main branch comprises a plurality of first rectifying circuits, the input ends of the plurality of first rectifying circuits are connected with a plurality of first output windings of the phase-shifting transformer, and the output ends of the plurality of first rectifying circuits are connected with the input ends of the Buck converter. In some embodiments, the main branch includes a plurality of Buck converters, and the output terminal of the first rectifying circuit is connected to the input terminals of the plurality of Buck converters, and the output terminals of the plurality of Buck converters are connected to the first terminal of the dc bus. The embodiment of the specification also provides a control method applied to the multi-element heterogeneous hydrogen production power supply, which comprises the following steps: acquiring a load electrical signal of the load; Determining a target working mode of the multi-element heterogeneous hydrogen production power supply according to the load electric signal; and controlling the Buck converter and the full-bridge circuit according to the target working mode. In some embodiments, the determining the operating mode of the multi-heterogeneous hydrogen generation power supply comprises: Selecting a target condition in a condition set based on the load electrical signal, The condition set comprises a plurality of conditions, and the conditions in the condition set correspond to the working mode of the multi-heterogeneous hydrogen production power supply; The target working mode is a working mode corresponding to the target condition. In some embodiments, the target operating mode is a steady state mode; The control of the Buck converter and the full-bridge