CN116760100A - Isolated hydrogen production power supply system and control method thereof - Google Patents
Isolated hydrogen production power supply system and control method thereof Download PDFInfo
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- CN116760100A CN116760100A CN202310664187.4A CN202310664187A CN116760100A CN 116760100 A CN116760100 A CN 116760100A CN 202310664187 A CN202310664187 A CN 202310664187A CN 116760100 A CN116760100 A CN 116760100A
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 127
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 127
- 239000001257 hydrogen Substances 0.000 title claims abstract description 127
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000010287 polarization Effects 0.000 claims description 23
- 239000003990 capacitor Substances 0.000 claims description 14
- 238000002955 isolation Methods 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 10
- 238000004146 energy storage Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000006641 stabilisation Effects 0.000 claims description 5
- 238000011105 stabilization Methods 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims description 3
- 230000034964 establishment of cell polarity Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000009413 insulation Methods 0.000 description 8
- 238000004891 communication Methods 0.000 description 6
- 238000010248 power generation Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/60—Constructional parts of cells
- C25B9/65—Means for supplying current; Electrode connections; Electric inter-cell connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses an isolated hydrogen production power supply system and a control method thereof, wherein the system comprises a control unit and more than one power branch, each power branch comprises a non-isolated DC/DC converter and an isolated DC/DC converter, the input end of each non-isolated DC/DC converter is connected with a photovoltaic system, the output end of each non-isolated DC/DC converter is connected with the input end of the isolated DC/DC converter of the corresponding power branch, and the output end of each isolated DC/DC converter is connected with an electrolytic tank; the control unit is respectively connected with each non-isolated DC/DC converter and each isolated DC/DC converter and is used for adjusting the duty ratio of each non-isolated DC/DC converter and the gain of each isolated DC/DC converter so as to realize the voltage matching between the photovoltaic system and the electrolytic tank. The invention can realize the matching of the voltage of the photovoltaic system and the electrolytic tank and avoid the direct electrical connection of the photovoltaic system and the electrolytic tank.
Description
Technical Field
The invention mainly relates to the technical field of hydrogen production, in particular to an isolated hydrogen production power supply system and a control method thereof.
Background
In the traditional field, the electrical energy produced by photovoltaic cells is generally converted into ac electrical energy which is connected to the grid through an ac grid. The hydrogen production power supply system takes energy from an alternating current power grid, rectifies the energy into direct current for the electrolytic tank, and the efficiency is necessarily lower due to more conversion links. Wherein the ac-coupled hydrogen production power supply is shown in fig. 1.
The direct current coupled hydrogen production power supply for the hydrogen production power supply is shown in fig. 2. If the energy (direct current) is directly taken from the photovoltaic array, an intermediate conversion link can be omitted, the high-efficiency utilization of the electric energy can be realized, and the method has great significance for saving and using the energy. However, the current photovoltaic direct current coupling mode has the following 4 problems:
1. because the cathode of the photovoltaic cell array group is not grounded, and the cathode of the electrolytic tank is grounded, the problem that the two systems are not compatible with the grounding of the hydrogen production power supply system needs to be solved.
2. The nominal voltage of a conventional photovoltaic converter is DC1500V (DC bus voltage is about DC 1350V), DC1000V (DC bus voltage is about DC 850V), and for the manufacturers of main current electrolytic cells, the DC supply voltage of the current electrolytic cells is between DC200V and DC 1000V. Therefore, the photovoltaic converter cannot be directly connected into the electrolytic cell, and the voltage of the photovoltaic converter needs to be regulated to be acceptable by the electrolytic cell through at least one stage of DC/DC conversion so as to continuously supply power.
3. For the different hydrogen production requirements of the electrolytic tank, hydrogen production power supply systems with different power levels are required, the conventional thyristor hydrogen production power supply system at present has larger power, for the requirements of the low-power electrolytic tank, the common practice is to cover the requirements of the low-power supply by using a high-power thyristor power supply, and the thyristor has overlarge type selection, so that the cost of the power supply system is increased.
4. The direct connection system of the photovoltaic cell array and the electrolytic cell has no intermediate DC/DC conversion link, the voltage and the power cannot be actively controlled, the output voltage and the power of the photovoltaic cell array are subjected to illumination, temperature, weather and other environmental factors, and the characteristics of large random variability are shown, which are contrary to the application requirements of the hydrogen production system of the electrolytic cell in controllable, continuous and stable hydrogen production and reliable polarization of the electrolytic cell. The direct connection system can not only ensure that the photovoltaic array works at the maximum power point, but also can not ensure that the load of the electrolytic cell stably operates at rated voltage and current points, and even the basic polarization premise before the hydrogen production work of the electrolytic cell is influenced, so that the engineering application can not be basically realized.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems existing in the prior art, the invention provides an isolated hydrogen production power supply system for realizing mutual matching of a photovoltaic system and an electrolytic tank voltage and a control method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the isolated hydrogen production power supply system comprises a control unit and more than one power branch, when the number of the power branches is multiple, the power branches are connected in parallel, each power branch comprises a non-isolated DC/DC converter and an isolated DC/DC converter, the input end of each non-isolated DC/DC converter is connected with the output end of a photovoltaic system, the output end of each non-isolated DC/DC converter is connected with the input end of the isolated DC/DC converter of the corresponding power branch, and the output end of each isolated DC/DC converter is connected with an electrolytic tank; the control unit is respectively connected with each non-isolated DC/DC converter and each isolated DC/DC converter and is used for adjusting the duty ratio of each non-isolated DC/DC converter and the gain of each isolated DC/DC converter so as to realize the voltage matching between the photovoltaic system and the electrolytic tank.
As a further improvement of the above technical scheme:
the isolation type DC/DC converter is a half-bridge LLC resonant converter or a full-bridge LLC resonant converter or a DAB converter.
The isolated DC/DC converter is a full-bridge LLC resonant converter and specifically comprises a high-frequency inversion module, an isolation module and a rectification module which are sequentially connected, wherein the input end of the high-frequency inversion module is connected with the output end of the non-isolated DC/DC converter, and the output end of the rectification module is connected with the electrolytic tank.
The high-frequency inverter module comprises a high-frequency inverter circuit, the isolation module comprises a high-frequency transformer, the rectification module comprises a rectification circuit, and the high-frequency inverter circuit, the high-frequency transformer and the rectification circuit are sequentially connected; the input end of the high-frequency inverter circuit is connected with a supporting capacitor in parallel, a resonance capacitor is connected between the high-frequency inverter circuit and the high-frequency transformer in series, and the output end of the rectifying circuit is connected with an output capacitor in parallel.
The transformation ratio of the high-frequency transformer is 1:1 or N:1, wherein N >1.
The non-isolated DC/DC converter is a Buck chopper circuit or a Boost chopper circuit.
The system further comprises a signal detection unit, wherein the signal detection unit is connected with the control unit and is used for detecting one or more of the input voltage of the non-isolated DC/DC converter, the output voltage of the isolated DC/DC converter, the temperature of each converter, the driving control signal of each converter or the state and protection feedback signal of each converter.
The control unit comprises a plurality of controllers, and each controller is respectively in one-to-one correspondence with the power branch and is used for realizing the control of the non-isolated DC/DC converter and the isolated DC/DC converter in the corresponding power branch.
The connection point of each non-isolated DC/DC converter and the isolated DC/DC converter is connected with the energy storage battery through the DC/DC module so as to realize the stabilization of the intermediate direct current side voltage between the non-isolated DC/DC converter and the isolated DC/DC converter.
The connection point of each non-isolated DC/DC converter and the isolated DC/DC converter is connected with a power grid through a DC/AC module so as to realize the stabilization of the intermediate direct current side voltage between the non-isolated DC/DC converter and the isolated DC/DC converter.
The invention also discloses a control method based on the isolated hydrogen production power supply system, which comprises the following steps:
in the initial state, the pulse of each DC/DC converter is blocked, the photovoltaic system sends the direct-current voltage to the input side of the hydrogen production power supply system, and the voltage of the middle direct-current side and the voltage of the output side of the hydrogen production power supply system are both zero;
starting an isolated DC/DC converter to work, and converting the intermediate DC side voltage into an output side voltage multiplied by a preset gain through the isolated DC/DC converter; at this time, the voltage of the middle direct current side is temporarily zero, and the preset gain is the lowest gain of the isolated DC/DC converter under the premise of realizing the soft switching characteristic;
starting the non-isolated DC/DC converter to work, outputting a preset duty ratio to the non-isolated DC/DC converter, converting the input side voltage into a smaller middle direct current side voltage through the non-isolated DC/DC converter, and converting the smaller middle direct current side voltage into the output side voltage of the hydrogen production power supply system after multiplying the preset gain through the isolated DC/DC converter;
gradually increasing the duty ratio of the non-isolated DC/DC converter until the voltage of the output side of the hydrogen production power supply system reaches the polarization voltage of the electrolytic cell, and then enabling the hydrogen production power supply system to continuously output small current to complete the polarization of the electrolytic cell by finely adjusting the duty ratio of the non-isolated DC/DC converter after the voltage reaches the polarization voltage of the electrolytic cell;
and then the duty ratio of the non-isolated DC/DC converter is kept unchanged, and the gain of the isolated DC/DC converter is regulated, so that the current at the output side of the hydrogen production power supply system is gradually increased until the rated current of the electrolytic cell is reached, and the electrolytic cell is in a rated running state.
As a further improvement of the above technical scheme:
the gain of the isolated DC/DC converter is adjusted by phase shifting or frequency modulation.
Before the output voltage of the hydrogen production power supply system reaches the polarization voltage of the electrolytic cell, the output voltage of the hydrogen production power supply system is controlled by an open loop; after the output voltage of the hydrogen production power supply system reaches the polarization voltage of the electrolytic tank, the constant small-current polarization of the electrolytic tank is realized by adjusting the duty ratio of the non-isolated DC/DC converter by the closed-loop control of the current at the output side of the hydrogen production power supply system and taking the maintained duty ratio as feedforward.
After the polarization of the electrolytic cell is completed, the closed-loop control of the output current of the hydrogen production power supply is realized by adjusting the gain of the isolated DC/DC converter, so that the output current of the hydrogen production power supply reaches the rated current of the electrolytic cell.
Compared with the prior art, the invention has the advantages that:
the isolated hydrogen production power supply system can realize the connection between the photovoltaic system and the electrolytic tank, and convert renewable solar energy into hydrogen chemical energy for storage so as to provide the hydrogen energy for the hydrogen energy utilization equipment, and simultaneously improve the photovoltaic power generation and absorption capacity; the photovoltaic cell array voltage is converted into bus voltage with a certain voltage level through the non-isolated DC/DC converter of the first stage, and then the photovoltaic system is matched with the electrolytic cell voltage through the conversion of the isolated DC/DC converter of the second stage.
According to the isolated hydrogen production power supply system, the direct electrical connection between the photovoltaic system and the electrolytic tank is disconnected through the second-stage isolated DC/DC converter, the photovoltaic system and the electrolytic tank are not directly electrically connected, the isolated hydrogen production power supply system has independent insulation characteristics to the ground, the respective insulation detection and insulation protection are not influenced, the direct electrical connection between the photovoltaic system and the electrolytic tank is avoided, and the incompatibility problem that the negative electrode of the photovoltaic converter is grounded and the negative electrode of the electrolytic tank is not grounded is solved.
The isolated hydrogen production power supply system can realize direct connection of the direct current coupled photovoltaic converter into the hydrogen production electrolytic tank, provide direct current power supply required by the electrolytic tank, improve the utilization efficiency of electric energy through direct current coupling hydrogen production, and realize hydrogen production on the power generation side of the photovoltaic system.
According to the invention, through a flexible mode of parallel connection of a plurality of power branches and a single cabinet, different power demands of the electrolytic tank are solved, rapid parallel connection of the combined cabinets can be realized, the power demands are accurately met, meanwhile, the design and development flow is greatly reduced, and meanwhile, the maintenance convenience of the hydrogen production power supply system is also increased. In addition, the multiple power branches or single cabinets are connected in parallel, so that redundancy of the hydrogen production power supply system is improved, when a single or a plurality of power branches or single cabinets fail, the corresponding failed power branch or single cabinet is cut off, the hydrogen production power supply system only loses part of power and cannot completely exit, and running stability of the hydrogen production power supply system is improved.
Drawings
FIG. 1 is a topology diagram of an AC-coupled hydrogen generation power supply in the prior art.
Fig. 2 is a topological structure diagram of a direct current coupling hydrogen production power supply in the prior art.
Fig. 3 is a topological structure diagram of an embodiment of the hydrogen-producing power supply system of the present invention.
FIG. 4 is a graph of the load characteristics of the electrolyzer of the present invention.
Fig. 5 is a schematic circuit diagram of a single cabinet embodiment of the hydrogen generation power supply system of the present invention.
Fig. 6 is one of the circuit schematic diagrams of the single power branch of the present invention in an embodiment.
Fig. 7 is a second schematic circuit diagram of a single power branch of the present invention in an embodiment.
Fig. 8 is a third schematic circuit diagram of an embodiment of a single power branch of the present invention.
Fig. 9 is a schematic diagram of signal detection of an embodiment of the signal detection unit of the present invention.
FIG. 10 is a diagram of an embodiment of a controller according to the present invention in a specific application.
FIG. 11 is a topological structure diagram of another embodiment of the hydrogen generation power supply system of the present invention.
FIG. 12 is a block diagram of an embodiment of a control system for a hydrogen generation power supply system in accordance with the present invention.
Detailed Description
The invention is further described below with reference to the drawings and specific examples.
As shown in fig. 3, the isolated hydrogen production power supply system provided by the embodiment of the invention comprises a control unit and more than one power branch, when the number of the power branches is multiple, the power branches are connected in parallel, each power branch comprises a non-isolated DC/DC converter and an isolated DC/DC converter, the input end of each non-isolated DC/DC converter is connected with the output end of the photovoltaic system, the output end of the non-isolated DC/DC converter is connected with the input end of the isolated DC/DC converter of the corresponding power branch, and the output end of each isolated DC/DC converter is connected with the electrolytic tank; the control unit is respectively connected with each non-isolated DC/DC converter and each isolated DC/DC converter and is used for adjusting the duty ratio of each non-isolated DC/DC converter and the gain of each isolated DC/DC converter so as to realize the voltage matching between the photovoltaic system and the electrolytic tank.
The isolated hydrogen production power supply system can realize the connection between the photovoltaic system and the electrolytic tank, and convert renewable solar energy into hydrogen chemical energy for storage so as to provide the hydrogen energy for the hydrogen energy utilization equipment, and simultaneously improve the photovoltaic power generation and absorption capacity; the photovoltaic cell array voltage is converted into bus voltage with a certain voltage level through the non-isolated DC/DC converter of the first stage, and then the photovoltaic system and the electrolytic cell voltage are matched through the conversion of the isolated DC/DC converter of the second stage.
Specifically, the voltage difference of the current mainstream DC1500V photovoltaic system is matched with the voltage difference of the DC200V-DC1000V electrolytic tank, and the current mainstream DC1500V photovoltaic system and the current mainstream DC200V-DC1000V electrolytic tank cannot be directly connected and applied. The duty ratio of the non-isolated DC/DC converter is adjustable, and the DC0-1500V of the output voltage can be adjusted by only changing the duty ratio of the non-isolated DC/DC converter without changing hardware parameters, so that the input requirement of the follow-up isolated DC/DC converter is met; through the duty ratio of the non-isolated DC/DC converter and the gain adjustment of the isolated DC/DC converter, the voltage matching between the photovoltaic system and the electrolytic tank is finally realized, and the stable operation of the electrolytic tank is ensured.
According to the isolated hydrogen production power supply system, the direct electrical connection between the photovoltaic system and the electrolytic tank is disconnected through the second-stage isolated DC/DC converter, the photovoltaic system and the electrolytic tank are not directly electrically connected, the isolated hydrogen production power supply system has independent insulation characteristics to the ground, the respective insulation detection and insulation protection are not influenced, the direct electrical connection between the photovoltaic system and the electrolytic tank is avoided, the problem of incompatibility of the grounding of the negative electrode of the photovoltaic converter and the non-grounding of the negative electrode of the electrolytic tank is solved (wherein the direct current negative electrode of the photovoltaic system is directly grounded, the negative electrode of the electrolytic tank is not grounded, and the grounding insulation of the electrolytic tank is influenced if the direct electrical connection of the photovoltaic system and the electrolytic tank is adopted, so that insulation detection faults and even accidents are caused).
The isolated hydrogen production power supply system can realize direct connection of the direct current coupled photovoltaic converter into the hydrogen production electrolytic tank, provide direct current power supply required by the electrolytic tank, improve the utilization efficiency of electric energy through direct current coupling hydrogen production, and realize hydrogen production on the power generation side of the photovoltaic system.
In a specific embodiment, the isolated DC/DC converter is a half-bridge LLC resonant converter or a full-bridge LLC resonant converter or a DAB converter. Specifically, the isolation type DC/DC converter is a full-bridge LLC resonant converter, and specifically comprises a high-frequency inversion module, an isolation module and a rectification module which are sequentially connected, wherein the input end of the high-frequency inversion module is connected with the output end of the non-isolation type DC/DC converter, and the output end of the rectification module is connected with the electrolytic tank. The high-frequency inverter module comprises a high-frequency inverter circuit, the isolation module comprises a high-frequency transformer, the rectification module comprises a rectification circuit, and the high-frequency inverter circuit, the high-frequency transformer and the rectification circuit are sequentially connected; the input end of the high-frequency inverter circuit is connected with a supporting capacitor in parallel, a resonance capacitor is connected between the high-frequency inverter circuit and the high-frequency transformer in series, and the output end of the rectifying circuit is connected with an output capacitor in parallel.
The isolation is realized by the high-frequency isolation transformer inside the isolated DC/DC converter, so that the electric isolation of the cathode of the photovoltaic converter and the cathode of the hydrogen production electrolytic tank is realized by grounding the cathode of the photovoltaic converter and not grounding the cathode of the hydrogen production electrolytic tank.
Specifically, the non-isolated DC/DC converter is a Buck chopper circuit or a Boost chopper circuit, and can be three-level or two-level.
In a specific embodiment, for different electrolytic tank requirements, the configuration of the hydrogen production power supply system meeting different power requirements can be realized by connecting a plurality of power branches in parallel. Wherein a plurality of power branches are arranged in a single cabinet. As an example, fig. 12 is a control system block diagram of a typical 6MW hydrogen production power system (6 MW is a typical hydrogen production power requirement, and under different power requirements, a single cabinet may be reduced or multiple cabinets may be added correspondingly). Through the above-mentioned parallelly connected nimble mode of a plurality of power branches and single cabinet, solve the different power demands of electrolysis trough, can realize parallelly connected group's cabinet fast, the accurate power demand that satisfies simultaneously, greatly reduced design development flow has also increased hydrogen manufacturing power supply system maintenance convenience simultaneously. In addition, the multiple power branches or single cabinets are connected in parallel, so that redundancy of the hydrogen production power supply system is improved, when a single or a plurality of power branches or single cabinets fail, the corresponding failed power branch or single cabinet is cut off, the hydrogen production power supply system only loses part of power and cannot completely exit, and running stability of the hydrogen production power supply system is improved.
In addition, the output ends of the isolated DC/DC converters of the power branches are connected with each other, so that the isolated DC/DC converters or the non-isolated DC/DC converters of the power branches can be mutually redundant on the basis that the power branches can be mutually redundant, the redundancy of the hydrogen production power supply system is further improved, and the working reliability of the hydrogen production power supply system is ensured.
Fig. 12 is a control system block diagram of an isolated hydrogen production power supply system, wherein an internal power branch (75 kW) of a single cabinet is connected to a communication manager through an RS485, and the communication manager communicates with a master control PLC ethernet. The master control PLC is used as a communication terminal between the hydrogen production power supply system and the outside, and is in real-time communication with a remote control system of a hydrogen production station of a user in an RS485 and Ethernet mode, wherein the communication modes are standby.
As shown in fig. 10, the control unit includes a plurality of controllers, each of which is in one-to-one correspondence with a power branch, for implementing control of the non-isolated DC/DC converter and the isolated DC/DC converter of the corresponding power branch. Wherein each controller is respectively connected with the master control PLC in a communication way. The controllers work independently and are not affected by each other, so that independent work among each power branch is realized; after a certain power branch fails, only the failed power branch is needed to be cut off, the work of other power branches is not affected, and the redundancy and the usability of the hydrogen production power supply are improved.
As shown in fig. 9, the DC/DC converter further comprises a signal detection unit connected to the control unit for detecting the input voltage U of the non-isolated DC/DC converter i (two input half voltages, i.e. C in1 And C in2 Voltage on) and output voltage U of non-isolated DC/DC converter d Output voltage U of isolated DC/DC converter o One or more of temperature on each converter power module, IGBT gate drive control signal for each converter, or IGBT status and protection feedback signal for each converter. The signal detection unit is used for detecting each signal, so that the overall monitoring and control of the hydrogen production power supply system are realized.
In specific application, the corresponding set of 6MW isolated hydrogen production power supply system is formed by connecting 4 single cabinets (1.5 MW) in parallel. Each single cabinet consists of 20 power branches (75 kW), as shown in fig. 5. The DC input voltage of the single power branch is DC1500V, and the single power branch is sent to a non-isolated DC/DC converter (the first dotted line box on the left in fig. 6) to DC0V-DC750V (the duty ratio is 0.5, and according to practical requirements, the duty ratio is changed to realize DC200-DC1000V output), and then sent to the isolated DC/DC converter to perform high-frequency inversion (the second dotted line box from the left), isolation (the third dotted line box from the left) and rectification (the fourth dotted line box from the left) and then output DC0V-DC750V (hereinafter, the output DC750V is described as an example), and after the multiple power branches are connected in parallel, the electrolytic tank is supplied with power.
The non-isolated DC/DC converter in the power branch circuit adopts a chopper circuit, as shown in fig. 6, wherein the chopper circuit consists of a switching tube, a chopper inductor and an input/output capacitor, and is specifically a three-level bidirectional DC/DC module, when energy flows from left to right, the non-isolated DC/DC converter is a three-level step-down chopper circuit, and the chopper output voltage is DC0V-DC750V.
By varying the duty cycle of the three-level buck chopper circuit, it is possible to buck the input DC1500V (nominal voltage of the photovoltaic) to any desired direct voltage.
In particular, for the non-isolated DC/DC converter, the three-level step-down chopper circuit may be changed to a two-level step-down chopper circuit as shown in fig. 7.
The isolated DC/DC converter in the power branch adopts a full-bridge LLC resonant converter, and the full-bridge LLC resonant converter is composed of a supporting capacitor C b (shared with chopper output capacitor), main switching tube (IGBT), resonant capacitor C r High-frequency transformer T r Secondary rectifying circuit and output capacitor C o Composition is prepared.
The resonant circuit converts the output voltage (DC 0V-DC 750V) of the front stage into high-frequency square wave voltage through high frequency conversion, realizes energy transmission, voltage conversion and electric isolation through a high-frequency transformer, and obtains stable DC0V-DC750V voltage through a rectifying and filtering circuit. The transformation ratio of the high-frequency transformer is 1:1, and the parameters are as follows:
high frequency transformer parameters:
in particular, if the voltage change ratio cannot be effectively adjusted only by adjusting the duty ratio of the front-stage step-down chopper circuit at this time in the case where the difference between the DC photovoltaic voltage and the voltage of the electrolytic cell is large, for example, the photovoltaic DC voltage is DC1500V and the voltage of the electrolytic cell is DC200V, it is considered that the high-frequency transformer change ratio is adjusted to n:1 (where N is generally selected from 1 to 4, N >1 in this embodiment), as shown in fig. 8:
in another embodiment, the connection point (the middle direct current side bus port) of each non-isolated DC/DC converter and the isolated DC/DC converter is connected with the energy storage battery through the DC/DC module so as to realize the stability of the voltage between the non-isolated DC/DC converter and the isolated DC/DC converter.
Further, the connection point of each non-isolated DC/DC converter and the isolated DC/DC converter is connected with the power grid through the DC/AC module, so that the voltage stability of the middle side of the non-isolated DC/DC converter and the isolated DC/DC converter is realized.
The bus port is led out from the middle direct current side of the hydrogen production power supply system, and then the bus port is connected with the energy storage battery through the DC/DC module or connected with the power grid through the DC/AC module, so that an energy flow channel between the hydrogen production power supply system and the energy storage battery as well as the power grid is increased, and better energy flow and renewable energy utilization are realized through reasonable control. Specifically, after the polarization of the electrolytic cell is completed, the voltage stabilization control can be performed through a DC/DC module connected with an energy storage battery or a DC/AC module connected with a power grid, so that the voltage of the middle direct current side is stabilized at a level which is easy to realize and has better system performance.
Further, when the photovoltaic cell array (photovoltaic system) cannot work normally at night or under other severe weather conditions, the energy storage battery and the grid-connected four-quadrant DC/AC module can continuously support the middle direct-current side voltage of the hydrogen production power supply system, and the electrolytic cell can continue to operate without synchronous stopping, so that the utilization rate of the electrolytic cell and the average hydrogen production rate are improved.
The embodiment of the invention also provides a control method based on the isolated hydrogen production power supply system, which comprises the following steps:
in the initial state, all DC/DC converters are blocked by pulse, the photovoltaic system sends direct-current voltage to the input side of the hydrogen production power supply system, and the voltage of the middle direct-current side and the voltage of the output side of the hydrogen production power supply system are zero;
starting an isolated DC/DC converter to work, and converting the intermediate DC side voltage into an output side voltage multiplied by a preset gain through the isolated DC/DC converter; at this time, the intermediate side voltage is temporarily zero, and the preset gain is the lowest gain of the isolated DC/DC converter on the premise of realizing the soft switching characteristic;
starting the non-isolated DC/DC converter to work, outputting a preset duty ratio to the non-isolated DC/DC converter, converting the input side voltage of the hydrogen production power supply system into a smaller middle direct current side voltage through the non-isolated DC/DC converter, and converting the middle direct current side voltage into the output side voltage of the hydrogen production power supply system multiplied by the preset increment through the isolated DC/DC converter;
gradually increasing the duty ratio of the non-isolated DC/DC converter until the output side voltage of the hydrogen production power supply system reaches the polarization voltage of the electrolytic cell, and after reaching the polarization voltage of the electrolytic cell (corresponding to the voltage corresponding to the K point in fig. 4, the load current of the electrolytic cell is smaller at the moment), continuously outputting small current by the hydrogen production power supply system to complete the polarization of the electrolytic cell by fine tuning the duty ratio of the non-isolated DC/DC converter; wherein the typical load characteristic of the electrolyzer is shown in FIG. 4;
and then the duty ratio of the non-isolated DC/DC converter is kept unchanged, the gain of the isolated DC/DC converter is regulated (the regulation of the gain of the isolated DC/DC converter is realized through phase shifting or frequency modulation in the soft switching characteristic range), so that the current of the output side of the hydrogen production power supply system is gradually increased until the rated current of the electrolytic tank is reached, the rated operation state is reached, and the operation is kept.
In the above process, the segment switching control is specifically adopted, specifically: before the hydrogen production power supply system reaches the polarization voltage of the electrolytic cell, the output voltage of the hydrogen production power supply system is controlled in an open loop mode. Specifically, the intermediate DC side voltage is the hydrogen production power supply system input side voltage×duty cycle, that is, udc_mid=d×udc_in, the hydrogen production power supply system output side voltage is the intermediate DC side voltage×minimum gain Amin, that is, udc_out=amin×udc_mid=amin×d×udc_in, and the controller gradually increases the intermediate DC side voltage and the hydrogen production power supply system output side voltage by gradually increasing the duty cycle D of the isolated DC/DC converter from 0 until the hydrogen production power supply system output side voltage reaches the electrolytic cell polarization voltage;
after the output side voltage of the hydrogen production power supply system reaches the polarization voltage of the electrolytic cell, constant small-current polarization of the electrolytic cell is realized by adopting closed-loop control of the output side current of the hydrogen production power supply system and taking the kept duty ratio as feedforward to adjust the duty ratio of the non-isolated DC/DC converter;
after polarization is completed, the gain (frequency modulation or phase shift) of the isolated DC/DC converter is regulated to carry out closed-loop control on the current at the output side of the hydrogen production power supply system, so that the electrolytic tank achieves the rated current hydrogen production operation.
In addition, in the application system that the middle direct current side of the hydrogen production power supply is connected into an energy storage battery through a DC/DC module or is connected into a power grid through a DC/AC module, the non-isolated DC/DC converter adopts closed-loop control of voltage at the input side of the hydrogen production power supply system and MPPT control of the photovoltaic cell array group, the energy of the photovoltaic power generation system is utilized to the maximum extent, and meanwhile, the isolated DC/DC converter adopts closed-loop control of output current based on rated current of the electrolytic tank, so that continuous and stable hydrogen production operation of the electrolytic tank is realized.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (14)
1. The isolated hydrogen production power supply system is characterized by comprising a control unit and more than one power branch, wherein when the number of the power branches is more than one, the power branches are connected in parallel, each power branch comprises a non-isolated DC/DC converter and an isolated DC/DC converter, the input end of each non-isolated DC/DC converter is connected with the output end of a photovoltaic system, the output end of each non-isolated DC/DC converter is connected with the input end of the isolated DC/DC converter of the corresponding power branch, and the output end of each isolated DC/DC converter is connected with an electrolytic tank; the control unit is respectively connected with each non-isolated DC/DC converter and each isolated DC/DC converter and is used for adjusting the duty ratio of each non-isolated DC/DC converter and the gain of each isolated DC/DC converter so as to realize the voltage matching between the photovoltaic system and the electrolytic tank.
2. The isolated hydrogen production power supply system of claim 1, wherein the isolated DC/DC converter is a half-bridge LLC resonant converter or a full-bridge LLC resonant converter or a DAB converter.
3. The isolated hydrogen production power supply system according to claim 2, wherein the isolated DC/DC converter is a full-bridge LLC resonant converter, and specifically comprises a high-frequency inversion module, an isolation module and a rectification module which are sequentially connected, wherein an input end of the high-frequency inversion module is connected with an output end of the non-isolated DC/DC converter, and an output end of the rectification module is connected with an electrolytic tank.
4. An isolated hydrogen production power supply system as claimed in claim 3, wherein the high frequency inverter module comprises a high frequency inverter circuit, the isolation module comprises a high frequency transformer, the rectifier module comprises a rectifier circuit, and the high frequency inverter circuit, the high frequency transformer and the rectifier circuit are connected in sequence; the input end of the high-frequency inverter circuit is connected with a supporting capacitor in parallel, a resonance capacitor is connected between the high-frequency inverter circuit and the high-frequency transformer in series, and the output end of the rectifying circuit is connected with an output capacitor in parallel.
5. The isolated hydrogen-producing power supply system of claim 3 or 4, wherein the high-frequency transformer has a transformation ratio of 1:1 or N:1, wherein N >1.
6. The isolated hydrogen production power supply system of any of claims 1-4, wherein the non-isolated DC/DC converter is a Buck chopper or a Boost chopper.
7. The isolated hydrogen production power supply system as in any one of claims 1-4, further comprising a signal detection unit coupled to the control unit for detecting one or more of an input voltage of the non-isolated DC/DC converter, an output voltage of the isolated DC/DC converter, a temperature of each converter, a drive control signal for each converter, or a status and protection feedback signal for each converter.
8. The isolated hydrogen production power supply system as in any one of claims 1-4, wherein the control unit comprises a plurality of controllers, each of the controllers being in one-to-one correspondence with the power branches, respectively, for effecting control of the non-isolated DC/DC converter and the isolated DC/DC converter in the corresponding power branches.
9. An isolated hydrogen production power supply system as defined in any one of claims 1-4, wherein the connection point of each of said non-isolated DC/DC converters and isolated DC/DC converter is connected to an energy storage battery via a DC/DC module to achieve stabilization of the intermediate DC side voltage between the non-isolated DC/DC converter and isolated DC/DC converter.
10. An isolated hydrogen production power supply system as in any of claims 1-4 wherein the connection point of each of said non-isolated DC/DC converters to the isolated DC/DC converter is connected to the grid via a DC/AC module to achieve stabilization of the intermediate DC side voltage between the non-isolated DC/DC converter and the isolated DC/DC converter.
11. A control method based on the isolated hydrogen production power supply system as claimed in any one of claims 1 to 10, comprising the steps of:
in the initial state, the pulse of each DC/DC converter is blocked, the photovoltaic system sends the direct-current voltage to the input side of the hydrogen production power supply system, and the voltage of the middle direct-current side and the voltage of the output side of the hydrogen production power supply system are both zero;
starting an isolated DC/DC converter to work, and converting the intermediate DC side voltage into an output side voltage multiplied by a preset gain through the isolated DC/DC converter; at this time, the voltage of the middle direct current side is temporarily zero, and the preset gain is the lowest gain of the isolated DC/DC converter under the premise of realizing the soft switching characteristic;
starting the non-isolated DC/DC converter to work, outputting a preset duty ratio to the non-isolated DC/DC converter, converting the input side voltage into a smaller middle direct current side voltage through the non-isolated DC/DC converter, and converting the smaller middle direct current side voltage into the output side voltage of the hydrogen production power supply system after multiplying the preset gain through the isolated DC/DC converter;
gradually increasing the duty ratio of the non-isolated DC/DC converter until the voltage of the output side of the hydrogen production power supply system reaches the polarization voltage of the electrolytic cell, and then enabling the hydrogen production power supply system to continuously output small current to complete the polarization of the electrolytic cell by finely adjusting the duty ratio of the non-isolated DC/DC converter after the voltage reaches the polarization voltage of the electrolytic cell;
and then the duty ratio of the non-isolated DC/DC converter is kept unchanged, and the gain of the isolated DC/DC converter is regulated, so that the current at the output side of the hydrogen production power supply system is gradually increased until the rated current of the electrolytic cell is reached, and the electrolytic cell is in a rated running state.
12. The control method according to claim 11, characterized in that the adjustment of the gain of the isolated DC/DC converter is achieved by phase shifting or frequency modulation.
13. The control method according to claim 11 or 12, wherein the hydrogen production power supply system output voltage is subjected to open loop control before the hydrogen production power supply system output voltage reaches the electrolytic cell polarization voltage; after the output voltage of the hydrogen production power supply system reaches the polarization voltage of the electrolytic tank, the constant small-current polarization of the electrolytic tank is realized by adjusting the duty ratio of the non-isolated DC/DC converter by the closed-loop control of the current at the output side of the hydrogen production power supply system and taking the maintained duty ratio as feedforward.
14. The control method according to claim 13, wherein after the polarization of the electrolytic cell is completed, the closed-loop control of the hydrogen production power supply output current is realized by adjusting the gain of the isolated DC/DC converter so that the hydrogen production power supply output current reaches the rated current of the electrolytic cell.
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