Electrolytic hydrogen production rectifier power supply operation control method

Abstract

Disclosed in the present application is an electrolytic hydrogen production rectifier power supply operation control method, comprising an AC / DC converter first operates, and then a DC / DC converter starts; when the output voltage of a hydrogen production rectifier power supply is lower than a certain proportion value Z of a rated voltage, the DC / DC converter works in a step-down mode; and, when the output voltage of the hydrogen production rectifier power supply is greater than or equal to the certain proportion value Z of the rated voltage, the DC / DC converter exits from the step-down mode, all upper transistors of bridge arms of the DC / DC converter remain in a normally on state, all lower transistors of the bridge arms of the DC / DC converter remain in a normally off state, and the DC / DC converter remains in a pass-through state. In the method, in a low-load phase, both the AC-DC converter and the DC-DC work so as to achieve a good voltage regulation range; and in a high-load phase, the AC-DC works and the DC-DC is in a continues conduction working mode, such that the control and regulation of the output voltage changes from control by the output of the DC / DC unit to control by the output of the AD / DC unit, so as to achieve good energy-saving benefits.

Description

A method for controlling operation of a rectifier power supply for electrolytic hydrogen production

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 30, 2023, with application number 202311627519.8 and invention name “A method for controlling the operation of a rectifier power supply for electrolysis hydrogen production”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of hydrogen production technology, and in particular to a method for controlling the operation of a rectifier power supply for electrolytic hydrogen production. Background Art

[0003] Due to the large scale and high power consumption of water electrolysis hydrogen production equipment, the corresponding hydrogen production power supply has higher requirements on grid access friendliness and conversion efficiency.

[0004] Currently, there are two main types of power sources in hydrogen production devices:

[0005] One is a thyristor rectifier power supply, as shown in Figure 1, which is characterized by small size and high efficiency, but has problems such as a small adjustment range and large current harmonics. At the same time, a special rectifier transformer is required for rectification, which is relatively expensive.

[0006] The other is the IGBT rectifier power supply, as shown in Figure 2. Its characteristics are small current harmonics, wide adjustment range, and grid-friendly. However, the AC / DC+DC / DC two-stage topology has the problem of large power loss. Technical issues

[0007] The technical problem to be solved by the present application is to provide an operation control method for a rectifier power supply for electrolytic hydrogen production. The operation control method for a rectifier power supply for electrolytic hydrogen production uses an AC-DC converter plus a DC-DC converter to operate in a low-load stage, and has a good voltage regulation range; in a high-load stage, an AC-DC converter is used to operate, and the DC-DC converter is in a constant conduction working mode. The output voltage control regulation is changed from DC / DC unit output control to AD / DC unit output control, thereby saving about 50% of power loss and having good energy-saving benefits. Technical Solutions

[0008] To solve the above technical problems, the present application provides an electrolytic hydrogen production rectifier power supply operation control method, wherein the grid output is connected to a transformer, the transformer output is connected to an AC / DC converter input, the AC / DC converter output is connected to a DC / DC converter input, and the DC / DC converter output is connected to an electrolyzer. The AC / DC converter adopts a primary PFC rectifier topology; the DC / DC converter adopts a multi-way buck parallel topology, including N parallel switch tube bridge arms;

[0009] The AC / DC converter runs first, and then the DC / DC converter starts. When the output voltage of the hydrogen production rectifier power supply is lower than a certain proportion value Z of the rated voltage, the DC / DC converter operates in a step-down mode. When the output voltage of the hydrogen production rectifier power supply is greater than or equal to the certain proportion value Z of the rated voltage, the DC / DC converter exits the step-down mode, all upper tubes of the switch tube bridge arm of the DC / DC converter remain normally open, all lower tubes of the switch tube bridge arm of the DC / DC converter remain normally closed, and the DC / DC converter remains in a straight-through state.

[0010] The certain proportion value Z of the rated voltage is 70% to 90% of the rated voltage.

[0011] Preferably, the certain proportion value Z of the rated voltage is 85% of the rated voltage.

[0012] Preferably, the switch tube bridge arm used in the DC / DC converter is an IGBT bridge arm.

[0013] Preferably, the AC / DC converter includes a first switch tube T1, a second switch tube T2, a third switch tube T3, a fourth switch tube T4, a fifth switch tube T5, a sixth switch tube T6 and a first capacitor C1;

[0014] The grid output terminal U is connected to one end of the first input inductor L1, and two ends of the first inductor L1 are connected to two ends of the first switching transistor T1 and one end of the second switching transistor T2; the grid output terminal V is connected to one end of the second input inductor L2, and two ends of the second inductor L2 are connected to two ends of the third switching transistor T3 and one end of the fourth switching transistor T4; the grid output terminal W is connected to one end of the third input inductor L3, and two ends of the third inductor L3 are connected to two ends of the fifth switching transistor T5 and one end of the sixth switching transistor T6;

[0015] One end of the first switch tube T1 is simultaneously connected to one end of the third switch tube T3, one end of the fifth switch tube T5, and one end of the first capacitor C1. Two ends of the second switch tube T2 are simultaneously connected to two ends of the fourth switch tube T4, two ends of the sixth switch tube T6, and two ends of the first capacitor C1.

[0016] Preferably, the DC / DC converter includes a first switch tube Q1, a second switch tube Q2, ..., a 2n-1th switch tube Q 2n-1、 2nth switch tube Q 2n and a second capacitor C2;

[0017] The first switch tube Q1, the third switch tube Q3, ..., and the 2n-1th switch tube form the upper bridge arm of the switch tube of the multi-way buck parallel topology;

[0018] The second switch tube Q2, the fourth switch tube Q4, ..., and the 2nth switch tube form the lower bridge arm of the switch tube of the multi-way buck parallel topology;

[0019] One end of the first switch tube T1 is simultaneously connected to one end of the first switch tube Q1, one end of the third switch tube Q3, ..., one end of the 2n-1th switch tube Q 2n-1 two ends of the second switch tube T2 are simultaneously connected to the two ends of the second switch tube Q2, the two ends of the fourth switch tube Q4, ..., the 2nth switch tube Q 2n The two ends of the second capacitor C2 and the negative electrode of the electrolytic cell;

[0020] Two ends of the first switch tube Q1 are connected to one end of the second switch tube Q2 and one end of the first inductor L1, two ends of the third switch tube Q3 are connected to one end of the fourth switch tube Q4 and one end of the second inductor L2, ..., the 2n-1th switch tube Q 2n-1 The two ends of the 2nth switch tube Q 2n One end and the Nth inductor L n two ends of the first inductor L1 are connected to the two ends of the inductor on all other branches of the DC / DC converter, one end of the first capacitor C1 and the positive electrode of the electrolytic cell.

[0021] Preferably, the first switch tube Q1, the second switch tube Q2, ..., the 2n-1th switch tube Q 2n-1、 2nth switch tube Q 2n It is an IGCT, IGBT, MOS tube or diode.

[0022] Preferably, the first switch tube T1 , the second switch tube T2 , the third switch tube T3 , the fourth switch tube T4 , the fifth switch tube T5 , and the sixth switch tube T6 of the AC / DC converter are IGCTs, IGBTs, MOS tubes, or diodes.

[0023] Preferably, the DC / DC converter includes a first switch tube Q1, ..., a 2m-1th switch tube Q 2m-1、 The 2mth switch tube Q 2m、 2m+1th switch tube Q 2m+1、 2m+2 switch tube Q 2m+2、…、 No. 2n-1 switch tube Q 2n-1、 2nth switch tube Q 2n and a second capacitor C2;

[0024] The first switch tube Q1, ..., the 2m-1th switch tube Q 2m-1 , 2m+1th switch tube Q 2m+1 , ..., 2n-1th switch tube Q 2n-1 forming the upper bridge arm of the switch tube of the multi-way buck parallel topology;

[0025] The second switch tube Q2, ..., the 2mth switch tube Q 2m , 2m+2 switch tube Q 2m+2 , ..., 2nth switch tube Q 2n forming the lower bridge arm of the switch tube of the multi-way buck parallel topology;

[0026] The positive input end of the DC / DC converter is connected to one end of the first switch tube Q1, one end of the third switch tube Q3, ..., the 2m-1th switch tube Q 2m-1 One end of the 2m+1 switch tube Q 2m+1 One end, ..., the 2n-1th switch tube Q 2n-1 The negative input end of the DC / DC converter is connected to the two ends of the second switch tube Q2, the two ends of the fourth switch tube Q4, ..., the 2mth switch tube Q 2m The two ends of the 2m+2 switch tube Q 2m+2 The two ends of ..., the 2nth switch tube Q 2n Two ends of the second capacitor C2;

[0027] The two ends of the first switch tube Q1 are connected to one end of the second Q2 and one end of the first inductor L1, ..., the 2m-1th switch tube Q 2m-1 The two ends of the 2mth switch tube Q 2m One end and the mth inductor L m One end of the 2m+1th switch tube Q 2m+1 The two ends are connected to the 2m+2 switch tube Q 2m+2 One end and the m+1th inductor L m+1 One end, ..., the 2n-1th switch tube Q 2n-1 The two ends of the 2nth switch tube Q 2n One end and the nth inductor L n One end of the first inductor L1, two ends of the first inductor L1 are connected to two ends of the inductors on all other branches of the DC / DC converter and one end of the second inductor C2;

[0028] Among them, 1 <m<n。

[0029] Preferably, the first switch tube Q1, ..., the 2m-1th switch tube Q 2m-1 , 2mth switch tube Q 2m All are device 1, the 2m+1th switch tube Q 2m+1 , 2m+2 switch tube Q 2m+2 , ..., 2n-1th switch tube Q 2n-1 , 2nth switch tube Q 2n Both are device 2, and device 1 and device 2 are different switching tube devices.

[0030] Preferably, the first switch tube Q1, ..., the 2m-1th switch tube Q 2m-1 , 2mth switch tube Q 2m is an IGBT or IGCT without an anti-parallel freewheeling diode; the 2m+1th switch tube Q 2m+1 , 2m+2 switch tube Q 2m+2 , ..., 2n-1th switch tube Q 2n-1 , 2nth switch tube Q 2n It is an IGBT or IGCT with an anti-parallel freewheeling diode. Beneficial effects

[0031] After adopting the above method, the grid output is connected to the transformer, the transformer output is connected to the AC / DC converter input, the AC / DC converter output is connected to the DC / DC converter input, and the DC / DC converter output is connected to the electrolyzer. The AC / DC converter adopts a first-level PFC rectifier topology; the DC / DC converter adopts a multi-way buck parallel topology, including N parallel switch tube bridge arms; the AC / DC converter runs first, and then the DC / DC converter starts. When the output voltage of the hydrogen production rectifier power supply is lower than a certain proportion value Z of the rated voltage, the DC / DC converter operates in a step-down mode; when the output voltage of the hydrogen production rectifier power supply is greater than or equal to a certain proportion value Z of the rated voltage, the DC / DC converter exits the step-down mode. mode, all upper tubes of the switch tube bridge arm of the DC / DC converter remain normally open, all lower tubes of the switch tube bridge arm of the DC / DC converter remain normally closed, and the DC / DC converter remains in a straight-through state; the certain proportion value Z of the rated voltage is 70% to 90% of the rated voltage; the electrolysis hydrogen production rectifier power supply operation control method uses an AC-DC converter plus a DC-DC converter to work in a low-load stage, and has a good voltage adjustment range; uses an AC-DC converter to work in a high-load stage, the DC-DC converter is in a constant conduction working mode, and the output voltage control adjustment is changed from DC / DC unit output control to AD / DC unit output control, thereby saving about 50% of power loss and having good energy-saving benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a circuit diagram 1 of a hydrogen production rectifier power supply of the prior art;

[0033] FIG2 is a circuit diagram 2 of a hydrogen production rectifier power supply of the prior art;

[0034] FIG3 is a circuit diagram 1 of a hydrogen production power supply of the electrolysis hydrogen production rectifier power supply operation control method of the present application;

[0035] FIG4 is a control flow chart 1 of the electrolysis hydrogen production rectifier power supply operation control method of the present application;

[0036] FIG5 is a second circuit diagram of a hydrogen production power supply of the electrolysis hydrogen production rectifier power supply operation control method of the present application;

[0037] FIG6 is a second control flow chart of the operation control method of the electrolysis hydrogen production rectifier power supply of the present application;

[0038] FIG7 is a third circuit diagram of the hydrogen production power supply of the electrolysis hydrogen production rectifier power supply operation control method of the present application. Modes for Carrying Out the Invention

[0039] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0040] Example 1

[0041] Please refer to Figures 3 and 4. Figure 3 is a circuit diagram of a hydrogen production power supply of the electrolysis hydrogen production rectifier power supply operation control method of the present application. Figure 4 is a control flow chart of the electrolysis hydrogen production rectifier power supply operation control method of the present application.

[0042] This embodiment discloses a method for controlling the operation of a rectifier power supply for hydrogen production by electrolysis. The grid output is connected to a transformer, the transformer output is connected to an AC / DC converter input, the AC / DC converter output is connected to a DC / DC converter input, and the DC / DC converter output is connected to an electrolyzer. The AC / DC converter adopts a primary PFC rectifier topology; the DC / DC converter adopts a multi-way buck parallel topology, including N parallel switch tube bridge arms.

[0043] The AC / DC converter runs first, and then the DC / DC converter starts. When the output voltage of the hydrogen production rectifier power supply is lower than a certain proportion value Z of the rated voltage, the DC / DC converter operates in a step-down mode. When the output voltage of the hydrogen production rectifier power supply is greater than or equal to the certain proportion value Z of the rated voltage, the DC / DC converter exits the step-down mode, all upper tubes of the switch tube bridge arm of the DC / DC converter remain normally open, all lower tubes of the switch tube bridge arm of the DC / DC converter remain normally closed, and the DC / DC converter remains in a straight-through state.

[0044] The certain proportion value Z of the rated voltage is 70% to 90% of the rated voltage.

[0045] Example 2

[0046] This embodiment is based on the first embodiment. In this embodiment, the certain proportion value Z of the rated voltage is 85% of the rated voltage.

[0047] Example 3

[0048] This embodiment is based on the first embodiment. In this embodiment, the switch tube bridge arm used in the DC / DC converter is an IGBT bridge arm.

[0049] Example 4

[0050] Please refer to Figures 5 and 6. Figure 5 is a circuit diagram 2 of the hydrogen production power supply of the electrolysis hydrogen production rectifier power supply operation control method of the present application, and Figure 6 is a control flow chart 2 of the electrolysis hydrogen production rectifier power supply operation control method of the present application;

[0051] This embodiment is based on the first embodiment. In this embodiment, the AC / DC converter includes a first switch tube T1, a second switch tube T2, a third switch tube T3, a fourth switch tube T4, a fifth switch tube T5, a sixth switch tube T6 and a first capacitor C1;

[0052] The grid output terminal U is connected to one end of the first input inductor L1, and two ends of the first inductor L1 are connected to two ends of the first switching transistor T1 and one end of the second switching transistor T2; the grid output terminal V is connected to one end of the second input inductor L2, and two ends of the second inductor L2 are connected to two ends of the third switching transistor T3 and one end of the fourth switching transistor T4; the grid output terminal W is connected to one end of the third input inductor L3, and two ends of the third inductor L3 are connected to two ends of the fifth switching transistor T5 and one end of the sixth switching transistor T6;

[0053] One end of the first switch tube T1 is simultaneously connected to one end of the third switch tube T3, one end of the fifth switch tube T5, and one end of the first capacitor C1. Two ends of the second switch tube T2 are simultaneously connected to two ends of the fourth switch tube T4, two ends of the sixth switch tube T6, and two ends of the first capacitor C1.

[0054] The DC / DC converter includes a first switch tube Q1, a second switch tube Q2, ..., a 2n-1th switch tube Q 2n-1、 2nth switch tube Q 2n and a second capacitor C2;

[0055] The first switch tube Q1, the third switch tube Q3, ..., and the 2n-1th switch tube form the upper bridge arm of the switch tube of the multi-way buck parallel topology;

[0056] The second switch tube Q2, the fourth switch tube Q4, ..., and the 2nth switch tube form the lower bridge arm of the switch tube of the multi-way buck parallel topology;

[0057] One end of the first switch tube T1 is simultaneously connected to one end of the first switch tube Q1, one end of the third switch tube Q3, ..., one end of the 2n-1th switch tube Q 2n-1 two ends of the second switch tube T2 are simultaneously connected to the two ends of the second switch tube Q2, the two ends of the fourth switch tube Q4, ..., the 2nth switch tube Q2n The two ends of the second capacitor C2 and the negative electrode of the electrolytic cell;

[0058] Two ends of the first switch tube Q1 are connected to one end of the second switch tube Q2 and one end of the first inductor L1, two ends of the third switch tube Q3 are connected to one end of the fourth switch tube Q4 and one end of the second inductor L2, ..., the 2n-1th switch tube Q 2n-1 The two ends of the 2nth switch tube Q 2n One end and the Nth inductor L n two ends of the first inductor L1 are connected to the two ends of the inductor on all other branches of the DC / DC converter, one end of the first capacitor C1 and the positive electrode of the electrolytic cell.

[0059] Example 5

[0060] This embodiment is based on the fourth embodiment. In this embodiment, the first switch tube Q1, the second switch tube Q2, ..., the 2n-1th switch tube Q 2n-1、 2nth switch tube Q 2n It is IGCT or IGBT or MOS tube or diode;

[0061] The first switch tube T1 , the second switch tube T2 , the third switch tube T3 , the fourth switch tube T4 , the fifth switch tube T5 , and the sixth switch tube T6 of the AC / DC converter are IGCTs, IGBTs, MOS tubes, or diodes.

[0062] Example 6

[0063] Please refer to FIG7 , which is a circuit diagram 3 of the hydrogen production power supply of the electrolysis hydrogen production rectifier power supply operation control method of the present application;

[0064] This embodiment is based on the first embodiment. In this embodiment, the DC / DC converter includes a first switch tube Q1, ..., a 2m-1th switch tube Q 2m-1、 The 2mth switch tube Q 2m、 2m+1th switch tube Q 2m+1、 2m+2 switch tube Q 2m+2、…、 No. 2n-1 switch tube Q 2n-1、 2nth switch tube Q 2n and a second capacitor C2;

[0065] The first switch tube Q1, ..., the 2m-1th switch tube Q 2m-1 , 2m+1th switch tube Q 2m+1 , ..., 2n-1th switch tube Q 2n-1 forming the upper bridge arm of the switch tube of the multi-way buck parallel topology;

[0066] The second switch tube Q2, ..., the 2mth switch tube Q 2m , 2m+2 switch tube Q 2m+2 , ..., 2nth switch tube Q 2n forming the lower bridge arm of the switch tube of the multi-way buck parallel topology;

[0067] The positive input end of the DC / DC converter is connected to one end of the first switch tube Q1, one end of the third switch tube Q3, ..., the 2m-1th switch tube Q 2m-1 One end of the 2m+1 switch tube Q 2m+1 One end, ..., the 2n-1th switch tube Q 2n-1 The negative input end of the DC / DC converter is connected to the two ends of the second switch tube Q2, the two ends of the fourth switch tube Q4, ..., the 2mth switch tube Q 2m The two ends of the 2m+2 switch tube Q 2m+2 The two ends of ..., the 2nth switch tube Q 2n Two ends of the second capacitor C2;

[0068] The two ends of the first switch tube Q1 are connected to one end of the second Q2 and one end of the first inductor L1, ..., the 2m-1th switch tube Q 2m-1 The two ends of the 2mth switch tube Q 2m One end and the mth inductor L m One end of the 2m+1th switch tube Q 2m+1 The two ends are connected to the 2m+2 switch tube Q 2m+2 One end and the m+1th inductor L m+1 One end, ..., the 2n-1th switch tube Q 2n-1 The two ends of the 2nth switch tube Q 2n One end and the nth inductor L n One end of the first inductor L1, two ends of the first inductor L1 are connected to two ends of the inductors on all other branches of the DC / DC converter and one end of the second inductor C2;

[0069] Among them, 1 <m<n。

[0070] In this embodiment, the first switch tube Q1, ..., the 2m-1th switch tube Q 2m-1 , 2mth switch tube Q 2m All are device 1, the 2m+1th switch tube Q 2m+1 , 2m+2 switch tube Q 2m+2 , ..., 2n-1th switch tube Q 2n-1 , 2nth switch tube Q 2n Both are device 2, and device 1 and device 2 are different types of switching tube devices.

[0071] In this embodiment, different devices are used to set the switch bridge arms in the DC-DC converter, which makes voltage regulation more flexible, reduces power loss, and achieves better energy-saving benefits.

[0072] Example 7

[0073] This embodiment is based on the sixth embodiment. In this embodiment, the first switch tube Q1, ..., the 2m-1th switch tube Q 2m-1 , 2mth switch tube Q 2m is an IGBT or IGCT without an anti-parallel freewheeling diode; the 2m+1th switch tube Q 2m+1 , 2m+2 switch tube Q 2m+2 , ..., 2n-1th switch tube Q 2n-1 , 2nth switch tube Q 2n It is an IGBT or IGCT with an anti-parallel freewheeling diode.

[0074] The electrolytic hydrogen production rectifier power supply operation control method uses an AC-DC converter plus a DC-DC converter to operate in a low-load stage, and has a good voltage regulation range. In a high-load stage, the AC-DC converter is used to operate, and the DC-DC converter is in a constant conduction working mode. The output voltage control regulation is changed from DC / DC unit output control to AD / DC unit output control, which saves about 50% of power loss and has good energy-saving benefits.

[0075] The preferred embodiments of the present application are described above with reference to the accompanying drawings, but are not intended to limit the scope of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present application shall fall within the scope of the present application.

Claims

1. A method for controlling the operation of a rectifier power supply for hydrogen production by electrolysis, characterized in that: The grid output is connected to the transformer, the transformer output is connected to the AC / DC converter input, the AC / DC converter output is connected to the DC / DC converter input, and the DC / DC converter output is connected to the electrolyzer. The AC / DC converter adopts a primary PFC rectifier topology; the DC / DC converter adopts a multi-channel buck parallel topology, including N parallel switch tube bridge arms; The AC / DC converter runs first, and then the DC / DC converter starts. When the output voltage of the hydrogen-producing rectifier power supply is lower than a certain proportion value Z of the rated voltage, the DC / DC converter operates in a step-down mode; when the output voltage of the hydrogen-producing rectifier power supply is greater than or equal to a certain proportion value Z of the rated voltage, the DC / DC converter exits the step-down mode, all upper tubes of the switch tube bridge arm of the DC / DC converter remain normally open, all lower tubes of the switch tube bridge arm of the DC / DC converter remain normally closed, and the DC / DC converter remains in a straight-through state; The certain proportion value Z of the rated voltage is 70% to 90% of the rated voltage.

2. The method for controlling the operation of a rectifier power supply for hydrogen production by electrolysis according to claim 1, characterized in that: The certain proportion value Z of the rated voltage is 85% of the rated voltage.

3. The method for controlling the operation of a rectifier power supply for hydrogen production by electrolysis according to claim 1, characterized in that: The switch tube bridge arm used in the DC / DC converter is an IGBT bridge arm.

4. The method for controlling the operation of a rectifier power supply for hydrogen production by electrolysis according to claim 1, characterized in that: The AC / DC converter includes a first switch tube T1, a second switch tube T2, a third switch tube T3, a fourth switch tube T4, a fifth switch tube T5, a sixth switch tube T6 and a first capacitor C1; The grid output terminal U is connected to one end of the first input inductor L1, and two ends of the first inductor L1 are connected to two ends of the first switch tube T1 and one end of the second switch tube T2; the grid output terminal V is connected to one end of the second input inductor L2, and two ends of the second inductor L2 are connected to two ends of the third switch tube T3 and one end of the fourth switch tube T4; the grid output terminal W is connected to one end of the third input inductor L3, and two ends of the third inductor L3 are connected to two ends of the fifth switch tube T5 and one end of the sixth switch tube T6; One end of the first switch tube T1 is simultaneously connected to one end of the third switch tube T3, one end of the fifth switch tube T5, and one end of the first capacitor C1, and two ends of the second switch tube T2 are simultaneously connected to two ends of the fourth switch tube T4, two ends of the sixth switch tube T6, and two ends of the first capacitor C1.

5. The method for controlling the operation of a rectifier power supply for hydrogen production by electrolysis according to claim 4, characterized in that: The DC / DC converter includes a first switch tube Q1, a second switch tube Q2, ..., a 2n-1th switch tube Q 2n-1 、 The 2nth switch tube Q 2n and a second capacitor C2; The first switch tube Q1, the third switch tube Q3, ..., and the 2n-1th switch tube form an upper bridge arm of the switch tubes of the multi-way buck parallel topology; The second switch tube Q2, the fourth switch tube Q4, ..., and the 2nth switch tube form the switch tube lower bridge arm of the multi-way buck parallel topology; One end of the first switch tube T1 is simultaneously connected to one end of the first switch tube Q1, one end of the third switch tube Q3, ..., one end of the 2n-1th switch tube Q 2n-1 two ends of the second switch tube T2 are simultaneously connected to the two ends of the second switch tube Q2, the two ends of the fourth switch tube Q4, ..., the 2nth switch tube Q 2n Two ends of the second capacitor C2 and the negative electrode of the electrolytic cell; Two ends of the first switch tube Q1 are connected to one end of the second switch tube Q2 and one end of the first inductor L1, two ends of the third switch tube Q3 are connected to one end of the fourth switch tube Q4 and one end of the second inductor L2, ..., the 2n-1th switch tube Q 2n-1 The two ends of the 2nth switch tube Q 2n One end and the Nth inductor L n two ends of the first inductor L1 are connected to the two ends of the inductor on all other branches of the DC / DC converter, one end of the first capacitor C1 and the positive electrode of the electrolytic cell.

6. The method for controlling the operation of a rectifier power supply for hydrogen production by electrolysis according to claim 5, characterized in that: The first switch tube Q1, the second switch tube Q2, ..., the 2n-1th switch tube Q 2n-1 、 The 2nth switch tube Q 2n It is IGCT or IGBT or MOS tube or diode.

7. The method for controlling the operation of a rectifier power supply for hydrogen production by electrolysis according to claim 4, characterized in that: The first switch tube T1, the second switch tube T2, the third switch tube T3, the fourth switch tube T4, the fifth switch tube T5 and the sixth switch tube T6 of the AC / DC converter are IGCTs or IGBTs or MOS tubes or diodes.

8. The method for controlling the operation of a rectifier power supply for hydrogen production by electrolysis according to claim 1, characterized in that: The DC / DC converter includes a first switch tube Q1, ..., a 2m-1th switch tube Q 2m-1 、 The 2mth switch tube Q 2m 、 The 2m+1 switch tube Q 2m+1 、 The 2m+2 switch tube Q 2m+2 、…、 The 2n-1th switch tube Q 2n-1 、 The 2nth switch tube Q 2n and a second capacitor C2; The first switch tube Q1, ..., the 2m-1th switch tube Q 2m-1 、2m+1th switch tube Q 2m+1 , ..., 2n-1th switch tube Q 2n-1 Forming the upper bridge arm of the switch tube of the multi-way buck parallel topology; The second switch tube Q2, ..., the 2mth switch tube Q 2m 、2m+2th switch tube Q 2m+2 , ..., 2nth switch tube Q 2n Forming the lower bridge arm of the switch tube of the multi-way buck parallel topology; The positive input end of the DC / DC converter is simultaneously connected to one end of the first switch tube Q1, one end of the third switch tube Q3, ..., the 2m-1th switch tube Q 2m-1 One end of the 2m+1 switch tube Q 2m+1 One end, ..., the 2n-1th switch tube Q 2n-1 The negative input end of the DC / DC converter is connected to two ends of the second switch tube Q2, two ends of the fourth switch tube Q4, ..., the 2mth switch tube Q 2m The two ends of the 2m+2 switch tube Q 2m+2 The two ends of, ..., the 2nth switch tube Q 2n Two ends of and two ends of a second capacitor C2; The two ends of the first switch tube Q1 are connected to one end of the second Q2 and one end of the first inductor L1, ..., the 2m-1th switch tube Q 2m-1 The two ends of the 2mth switch tube Q 2m One end and the mth inductor L m One end of the 2m+1th switch tube Q 2m+1 The two ends are connected to the 2m+2 switch tube Q 2m+2 One end and the m+1th inductor L m+1 One end, ..., the 2n-1th switch tube Q 2n-1 The two ends of the 2nth switch tube Q 2n One end and the nth inductor L n One end of the first inductor L1, two ends of the first inductor L1 are connected to two ends of the inductors on all other branches of the DC / DC converter and one end of the second inductor C2; Among them, 1 <m<n。 9. The method for controlling the operation of a rectifier power supply for hydrogen production by electrolysis according to claim 8, characterized in that: The first switch tube Q1, ..., the 2m-1th switch tube Q 2m-1 、2mth switch tube Q 2m All are device 1, the 2m+1th switch tube Q 2m+1 、2m+2th switch tube Q 2m+2 , ..., 2n-1th switch tube Q 2n-1 , 2nth switch tube Q 2n Both are device 2, and device 1 and device 2 are different switch tube devices.

10. The method for controlling the operation of a rectifier power supply for hydrogen production by electrolysis according to claim 9, characterized in that: The first switch tube Q1, ..., the 2m-1th switch tube Q 2m-1 、2mth switch tube Q 2m is an IGBT or IGCT without an anti-parallel freewheeling diode; the 2m+1th switch tube Q 2m+1 、2m+2th switch tube Q 2m+2 , ..., 2n-1th switch tube Q 2n-1 , 2nth switch tube Q 2n It is an IGBT or IGCT with an anti-parallel freewheeling diode.

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