CN116742965A - Hydrogen production power supply device based on alternating current voltage regulation and control method thereof - Google Patents

Hydrogen production power supply device based on alternating current voltage regulation and control method thereof Download PDF

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Publication number
CN116742965A
CN116742965A CN202310652293.0A CN202310652293A CN116742965A CN 116742965 A CN116742965 A CN 116742965A CN 202310652293 A CN202310652293 A CN 202310652293A CN 116742965 A CN116742965 A CN 116742965A
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Prior art keywords
voltage
module
current
alternating current
power supply
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CN202310652293.0A
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Inventor
梅文庆
甘韦韦
陈洁莲
翁星方
蔡宇峰
王雄
陶洪亮
高原
宋乾儒
谷涛
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Zhuzhou CRRC Times Electric Co Ltd
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Zhuzhou CRRC Times Electric Co Ltd
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Priority to CN202310652293.0A priority Critical patent/CN116742965A/en
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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
    • 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
    • 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
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • 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
    • C25B15/00—Operating or servicing cells
    • C25B15/02—Process control or regulation
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0012—Control circuits using digital or numerical techniques
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/25—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/257—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M5/2573—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with control circuit
    • H02M5/2576—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with control circuit with digital control
    • 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
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Abstract

The invention discloses a hydrogen production power supply device based on alternating current voltage regulation and a control method thereof. The invention is suitable for large current or ultra-large current scenes, and has the advantages of simple structure, easy realization, and the like, and can give consideration to the problems of cost and balance control.

Description

Hydrogen production power supply device based on alternating current voltage regulation and control method thereof
Technical Field
The invention relates to the technical field of water electrolysis hydrogen production power supplies, in particular to a hydrogen production power supply device based on alternating current voltage regulation and a control method thereof.
Background
The hydrogen energy is a secondary energy source and an important industrial raw material which are wide in source, clean, free of carbon, flexible, efficient and rich in application scene. The method for preparing hydrogen by electrolyzing water is a relatively convenient method for preparing hydrogen, has the characteristics of environmental protection, flexible production, high purity and the like, and is an ideal green hydrogen production mode. The hydrogen production power supply device is a key device in the water electrolysis hydrogen production system and is used for outputting the alternating current of the power grid to the direct current matched with the hydrogen production electrolytic tank through alternating-current-direct-current conversion. The performance quality and reliability of the hydrogen production power supply device are directly related to the efficiency and safety of the whole hydrogen production system.
The output current of the hydrogen production power supply device covers the demand range of thousands of amperes to tens of kiloamperes, and even the power supply demand of hundred kiloamperes level can be achieved. In the prior art, the hydrogen production power supply device is usually realized by three modes of thyristor rectification, diode rectification, IGBT chopping and full IGBT rectification and chopping, wherein the diode rectification, IGBT chopping mode is realized by combining a diode rectification circuit with an IGBT chopping circuit, and the full IGBT rectification, chopping mode is realized by combining a full IGBT rectification circuit with a chopping circuit, and the three modes adopt direct current voltage regulation modes, namely voltage regulation is carried out on a direct current side.
However, the diode rectification and IGBT chopping mode and the full IGBT rectification and chopping mode are adopted to meet the requirements of different current levels by adopting a multi-branch parallel connection mode, when the current exceeds a certain limit, a plurality of devices are required to be adopted to carry out output parallel connection on site, and the problems of very large whole volume, high cost, large site installation workload and the like of the complete set of devices exist. The thyristor rectifying mode is generally formed by parallel connection of more than three phase full-control bridges by being configured into 18 pulse waves or 24 pulse waves, and the output current capacity is required to be further improved by the mode of parallel connection of thyristor elements under the application working condition of high current or ultra-high current. However, the large-current thyristor rectification not only needs to pay attention to the current sharing among parallel elements of the same bridge arm, but also needs to pay attention to the inter-bridge current sharing of different rectifying bridges, and when the number of parallel connection exceeds three, the current sharing control difficulty of the thyristor rectification is high, and the higher the number of parallel connection, the more difficult the current sharing degree is ensured. For example, in the current sharing control between parallel elements of the same bridge arm, element parameter matching, assembly impedance matching, pulse consistency and the like need to be considered, and the current sharing control is difficult to realize. Meanwhile, because electromagnetic interference is very serious in a high-current application scene, a control system is easy to interfere, and current sharing control among parallel elements and current sharing control among bridges can be influenced.
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 the hydrogen production power supply device based on alternating current voltage regulation, which has the advantages of simple structure, easy realization and capability of considering the cost and balance control problem, and the control method thereof, and can be suitable for the hydrogen production power supply device which has low cost and no current sharing problem and is applicable to application scenes such as heavy current or ultra-heavy current.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the utility model provides a hydrogen manufacturing power supply device based on exchange pressure regulating, includes the high-voltage alternating current pressure regulating module, fixed depressurization module and the rectifier module that connect gradually, the alternating current power supply is connected to the input of high-voltage alternating current pressure regulating module, the electrolysis trough is connected to the output of rectifier module, high-voltage alternating current pressure regulating module inserts alternating current power supply and carries out voltage regulation, obtains the alternating current after adjusting, fixed depressurization module is right the alternating current after adjusting carries out the depressurization of predetermineeing the proportion, and the alternating current after the depressurization is through the rectifier module carries out alternating current-direct current conversion, obtains final required direct current and provides the electrolysis trough.
Further, the high-voltage alternating current voltage regulating module comprises a control unit and a voltage regulating unit which are connected with each other, wherein the control unit is also connected with the output side of the rectifying module and is used for controlling and regulating the output size of the voltage regulating unit according to the output size of the rectifying module.
Further, the control unit comprises a PI controller, and the input end of the PI controller is connected to the direct current voltage/current output by the rectifying module and the given reference voltage/current value respectively for comparison, and generates a control signal according to the comparison result to control and regulate the output of the voltage regulating unit, so that the output of the rectifying module tracks the given reference voltage/current.
Further, the voltage regulating unit is an inverse thyristor alternating current voltage regulating circuit or a chopper control alternating current voltage regulating circuit.
Further, the rectifying module is a diode rectifying circuit.
Further, the fixed step-down module is a step-down transformer with primary side voltage higher than secondary side voltage and primary side current lower than secondary side current.
Furthermore, the input side of the high-voltage alternating current voltage regulation module is also provided with a filter loop.
Further, the output voltage adjusting range of the high-voltage alternating current voltage regulating module is 0-Un, the output direct current voltage range of the rectifying module is 0-Un (Un x K1)/N, wherein Un is the accessed alternating current power supply voltage, K1 is the proportionality coefficient of the rectifying module, N is the primary-secondary side turns ratio of the transformer in the fixed step-down module, and N is more than 1.
The control method for the hydrogen production power supply device based on alternating current voltage regulation comprises the following steps:
obtaining direct-current voltage/current output by the rectifying module and a given reference voltage/current value;
comparing the direct current voltage/current output by the rectifying module with a given reference voltage/current value;
and generating a control signal according to the comparison result to control and regulate the output of the high-voltage alternating current voltage regulating module, so that the output of the rectifying module tracks the target voltage/current.
Further, the given reference voltage/current value is set according to the voltage regulation requirement of the electrolytic cell, so that the hydrogen production power supply device outputs direct current meeting the requirement to the electrolytic cell.
Further, the output voltage of the rectifying module is calculated according to the following formula:
wherein U is Ref For a given reference voltage U dc K is the output voltage of the rectifying module p +K i And/s is the transfer function of the PI control unit in the high-voltage AC voltage regulating module,is the transfer function of the voltage regulating unit in the high-voltage alternating-current voltage regulating module, 1/N is the proportionality coefficient of the fixed voltage reducing module, N is the primary-secondary side turns ratio of the voltage reducing transformer in the fixed voltage reducing module, and N>And 1, K1 is the proportionality coefficient of the rectifying module.
Compared with the prior art, the invention has the advantages that:
1. the hydrogen production power supply device is realized by adopting a mode of combining high-voltage side alternating current voltage regulation and voltage reduction rectification, and because the regulation and control part is arranged at the high-voltage side, the high-voltage side current can be regulated and controlled to be very small, the current level is greatly reduced, and a large number of branches or elements of a main loop are not required to be connected in parallel, so that the current sharing problem does not exist, the control is very easy even if the current sharing exists, and the hydrogen production power supply device is particularly suitable for large-current or ultra-large-current application scenes.
2. According to the invention, the output of the high-voltage side alternating current voltage regulation is regulated according to the output of the rectification module, so that automatic voltage regulation can be realized at the high-voltage side, and the variable voltage regulation of the high-voltage alternating current voltage regulation module and the fixed voltage regulation of the fixed voltage reduction module are combined to regulate the input voltage of the rectification module, so that the output voltage of the rectification module is indirectly regulated, the required direct current can be accurately generated, the output requirements of various hydrogen production power supply devices under a large current or ultra-large current scene are met, and the problem of current sharing in the hydrogen production power supply device is avoided.
3. Compared with thyristor rectification, when the multi-rectifying bridge or multi-element parallel connection is carried out by adopting uncontrollable diode rectification, the current sharing control between parallel bridges and multi-element of the same bridge arm can be realized more easily by only focusing on element parameter consistency matching and assembly impedance consistency matching, and the current sharing control problem can be further avoided.
4. Compared with the traditional controllable rectifying mode which has electromagnetic interference problem under the scene of high current and ultra-high current, the controllable rectifying module provided by the invention has the advantages that the reliability and the accuracy of the controllable rectifier pulse control are affected, and the difficulty of current sharing control is further increased.
Drawings
Fig. 1 is a schematic structural diagram of a hydrogen production power supply device based on ac voltage regulation in this embodiment.
Fig. 2 is a schematic diagram of a first single-phase ac voltage regulating circuit employed in a specific application embodiment.
Fig. 3 is a schematic diagram of a second single-phase ac voltage regulating circuit employed in a specific application embodiment.
Fig. 4 is a schematic diagram of a three-phase ac voltage regulating circuit employed in a specific application embodiment.
Fig. 5 is a schematic diagram of the control of a hydrogen-producing power supply device in a specific application embodiment of the invention.
Legend description: 1. a high voltage ac voltage regulation module; 101. a control unit; 102. a pressure regulating unit; 2. fixing a depressurization module; 3. and a rectifying module.
Detailed Description
The invention is further described below in connection with the drawings and the specific preferred embodiments, but the scope of protection of the invention is not limited thereby.
As shown in fig. 1, the hydrogen production power supply device based on ac voltage regulation in this embodiment includes a high-voltage ac voltage regulation module 1, a fixed voltage reduction module 2 and a rectification module 3, which are sequentially connected, wherein an input end of the high-voltage ac voltage regulation module 1 is connected with an ac power supply, an output end of the rectification module 3 is connected with an electrolytic tank, the high-voltage ac voltage regulation module 1 is connected with the ac power supply to perform voltage regulation, so as to obtain regulated ac, the fixed voltage reduction module 2 performs voltage reduction of a preset proportion on the regulated ac, and ac after voltage reduction is subjected to ac-dc conversion by the rectification module 3, so as to obtain a finally required dc power to be supplied to the electrolytic tank.
The hydrogen production power supply device is realized by adopting a mode of combining high-voltage side alternating current voltage regulation and voltage reduction rectification, the voltage regulation and control are realized by the high-voltage alternating current voltage regulation module 1, the fixed proportion voltage reduction is carried out by combining the fixed voltage reduction module 2, and the rectification module 3 is used for rectifying to obtain the required direct current. Because the regulation and control part is arranged at the high-voltage side, the current at the high-voltage side can be regulated to be very small, for example, when the direct current output of a hydrogen production power supply device is tens of thousands of amperes, the current at the position of the high-voltage alternating current voltage regulation module 1 can reach hundreds of amperes, the current level is greatly reduced, and furthermore, a large number of branches or elements of a main loop are not required to be connected in parallel, so that the current sharing problem does not exist, the current sharing is very easy to control even if the current sharing exists, and the device is particularly suitable for a scene of heavy current or ultra-heavy current.
In this embodiment, the high-voltage ac voltage regulating module 1 includes a control unit 101 and a voltage regulating unit 102 that are connected to each other, where the control unit 101 is further connected to an output side of the rectifying module 3, so as to control and regulate an output size of the voltage regulating unit 102 according to an output size of the rectifying module 3. The control unit 101 adjusts the output of the voltage adjusting unit 102 according to the output of the rectifying module 3 (the output of the hydrogen production power supply device), namely, the output of the high-voltage alternating current voltage adjusting module 1, so that the position of the high-voltage alternating current voltage adjusting module 1 at the high voltage side can realize automatic voltage adjustment which automatically changes along with the output of the device, an automatic and variable high-voltage alternating current voltage adjusting mode is formed, the variable voltage at the position of the high-voltage alternating current voltage adjusting module 1 and the fixed voltage adjusting of the fixed voltage reducing module 2 are combined to adjust the input voltage of the rectifying module 3, the output voltage of the rectifying module 3 is indirectly adjusted, direct currents with different sizes can be accurately generated, the output requirements of various hydrogen production power supply devices under a large current or ultra-large current scene are met, and meanwhile, the current equalizing problem inside the hydrogen production power supply device is avoided.
In this embodiment, the control unit 101 specifically adopts a PI controller, and the input end of the PI controller is connected to the dc voltage/current output by the rectifying module 3 and a given reference voltage/current value respectively for comparison, and generates a control signal according to the comparison result to control and regulate the output of the high-voltage ac voltage regulating module 1, so that the output of the rectifying module 3 (i.e. the final output of the hydrogen production power supply device) tracks the given reference voltage/current, and then the output of the hydrogen production power supply device can be accurately regulated by regulating the given reference voltage/current value.
In a specific application embodiment, the ac power supply (i.e., ac power grid) may be a three-phase ac power supply or a single-phase ac power supply, and the ac power grid may be a standard power grid or a micro-grid with different voltage systems generated by transforming a standard power grid with a transformer. When the alternating current power supply is three-phase power, all modules (the high-voltage alternating current voltage regulating module 1, the fixed voltage reducing module 2 and the rectifying module 3) in the hydrogen production power supply device are three-phase equipment, and when the alternating current power supply is single-phase power, all modules (the high-voltage alternating current voltage regulating module 1, the fixed voltage reducing module 2 and the rectifying module 3) in the hydrogen production power supply device are single-phase equipment. The electrolytic tank can adopt various types or various parameters according to actual requirements.
In a specific application embodiment, the voltage regulating unit 102 is specifically a power electronic voltage regulating circuit, and may be a voltage regulating circuit of various types such as an inverse thyristor ac voltage regulating circuit or a chopper ac voltage regulating circuit or a derivative circuit thereof. Specifically, if the ac power supply is single-phase ac, a single-phase ac voltage regulating circuit as shown in fig. 2, a phase control voltage regulating circuit composed of thyristors connected in anti-parallel, or a single-phase ac voltage regulating circuit as shown in fig. 3, a chopper control voltage regulating circuit composed of IGBT modules and diodes may be used. If the ac power supply is three-phase ac, a three-phase ac voltage regulating circuit as shown in fig. 4 may be used, and a three-phase control voltage regulating circuit composed of thyristors connected in anti-parallel with three phases. Typical voltages for the AC input of the voltage regulating unit 102 are e.g. AC6kV, AC10kV, AC21kV, AC27.5kV, AC35kV etc.
In this embodiment, the rectifying module 3 is specifically a diode rectifying circuit, that is, a rectifying circuit formed by connecting diodes. Compared with thyristor rectification, when multiple rectifier bridges or multi-element parallel connection is carried out by adopting uncontrollable diode rectification, the current sharing control between parallel bridges and multi-element of the same bridge arm can be easily realized by only focusing on element parameter consistency matching and assembly impedance consistency matching. For a large-current direct-current power supply, the influence of electromagnetic interference on a control loop is a non-negligible problem, and the reliability and accuracy of the pulse control of the controllable rectifier can be influenced by the electromagnetic interference problem in a large-current and ultra-large-current scene by the traditional controllable rectification mode, so that the difficulty of current sharing control is increased. In the embodiment, the diode rectifying circuit is adopted, so that a pulse control loop is not involved, and the adverse effect of high-current electromagnetic interference on current sharing control is effectively avoided.
It can be understood that the diode rectifying circuit of the rectifying module 3 can specifically adopt circuits with various pulse numbers of 6 pulse waves, 12 pulse waves, 24 pulse waves and the like according to actual requirements.
In this embodiment, the fixed step-down module 2 is specifically a step-down transformer with a primary voltage higher than a secondary voltage and a primary current lower than a secondary current, so that step-down with a fixed ratio can be realized.
The hydrogen production power supply device inevitably brings a certain electric energy quality problem to the alternating current power grid, and in the embodiment, a filter loop is further arranged on the input side of the high-voltage alternating current voltage regulation module 1, so that the electric energy quality of the alternating current power grid can be further improved. The filter loop can be specifically designed according to main characteristic subharmonics of the hydrogen production power supply device, so that the harmonic waves injected into the alternating current power grid by the hydrogen production power supply device meet the requirements.
In this embodiment, the output voltage adjustment range of the high-voltage ac voltage regulation module 1 is 0 to Un, the output dc voltage range of the rectification module 3 is 0 to (un×k1)/N, where Un is the ac power supply voltage to be connected, K1 is the proportionality coefficient of the rectification module 3, N is the primary-secondary side turns ratio of the transformer in the fixed voltage reduction module 2, and N >1. The output direct-current voltage range of the hydrogen production power supply device is 0 to (Un x K1)/N, and the hydrogen production power supply device has the capacity of adjusting from 0V, so that the hydrogen production power supply device can adapt to the voltage adjusting requirements of various hydrogen production electrolytic tank loads.
The control method for the hydrogen production power supply device based on alternating current voltage regulation in the embodiment comprises the following steps:
obtaining direct-current voltage/current output by the rectifying module 3 and a given reference voltage/current value;
comparing the direct voltage/current output by the rectifying module 3 with a given reference voltage/current value;
a control signal is generated according to the comparison result to control and regulate the output of the high-voltage alternating current voltage regulating module 1, so that the output of the rectifying module 3 tracks the target voltage/current.
The given reference voltage/current value is specifically set according to the voltage regulation requirement of the electrolytic cell, so that the hydrogen production power supply device outputs direct current meeting the requirement to the electrolytic cell.
As shown in fig. 5, the whole control process of the hydrogen production power supply device in this embodiment includes four links, namely, a PI regulation link, a voltage regulator link, a transformer link and a diode rectifier link, where the PI regulation link and the voltage regulator link are implemented by a high-voltage ac voltage regulation module 1, the transformer link corresponds to a fixed voltage reduction module 2, the diode rectifier link corresponds to a rectification module 3, and the transformer link and the diode rectifier link are all purely proportional links. The transfer function of the PI regulating link (1) is specifically K p +K i /s，K p Is a proportional gain, K i Is integral gain, and the voltage regulator link (2) isFirst order inertial element, transfer function thereofK 0 The gain constant of the voltage regulator is that Ts is the time constant of the voltage regulator, the step-down rectifier transformer links are pure proportion links (corresponding links (3)), the proportion coefficient number is 1/N, the diode rectifier is also a pure proportion link (corresponding links (4)), the proportion coefficient is K1, and the proportion coefficients of different rectifying circuits are different. The hydrogen production power supply device outputs a pulse by comparing a given reference voltage with the real-time output voltage of the device, and the output pulse of the controller is regulated after the PI regulation link is calculated, so that the power electronic device in the voltage regulator is controlled to be disconnected, the output voltage of the voltage regulator is regulated, and the final output effect of the hydrogen production power supply device can be controlled by regulating the output of the high-voltage alternating-current voltage regulator.
In this embodiment, the output voltage of the rectifying module 3 may be specifically calculated according to the following formula:
wherein Uref is given reference voltage, udc is output voltage of diode rectifier, K p +K i S is the transfer function of the PI regulating unit,is the transfer function of the voltage regulator, 1/N is the proportionality coefficient of the step-down rectifier transformer, N is the primary-secondary side turns ratio of the step-down rectifier transformer, and N>And 1, K1 is the proportionality coefficient of the rectifying module 3.
Through the control, the output voltage adjusting range of the alternating current voltage regulator is 0-Un (Un is the alternating current grid voltage), and the output direct current voltage range of the hydrogen production power supply device is 0- (Un is K1)/N, so that the regulating capability of regulating from 0V is provided, and the regulating capability can be suitable for the voltage regulating requirements of various hydrogen production electrolytic tank loads.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall fall within the scope of the technical solution of the present invention.

Claims (11)

1. The utility model provides a hydrogen manufacturing power supply device based on alternating current voltage regulation, its characterized in that includes high-voltage alternating current voltage regulation module (1), fixed depressurization module (2) and rectifier module (3) that connect gradually, alternating current power supply is connected to the input of high-voltage alternating current voltage regulation module (1), the electrolysis trough is connected to the output of rectifier module (3), high-voltage alternating current voltage regulation module (1) inserts alternating current power supply and carries out voltage regulation, obtains the alternating current after the regulation, fixed depressurization module (2) is right the alternating current after the regulation carries out the depressurization of predetermineeing the proportion, and alternating current after the depressurization is through rectifier module (3) carries out alternating current-direct current conversion, obtains final required direct current and provides the electrolysis trough.
2. The alternating current voltage regulation-based hydrogen production power supply device according to claim 1, wherein the high voltage alternating current voltage regulation module (1) comprises a control unit (101) and a voltage regulation unit (102) which are connected with each other, the control unit (101) is further connected with the output side of the rectifying module (3) for controlling and regulating the output size of the voltage regulation unit (102) according to the output size of the rectifying module (3).
3. The hydrogen production power supply device based on alternating current voltage regulation according to claim 2, wherein the control unit (101) comprises a PI controller, and the input end of the PI controller is connected to the direct current voltage/current output by the rectifying module (3) respectively, and a given reference voltage/current value is compared, and a control signal is generated according to the comparison result to control and regulate the output of the voltage regulation unit (102), so that the output of the rectifying module (3) tracks the given reference voltage/current.
4. The hydrogen production power supply device based on alternating current voltage regulation according to claim 2, wherein the voltage regulation unit (102) is an inverse thyristor alternating current voltage regulation circuit or a chopper control alternating current voltage regulation circuit.
5. The hydrogen generation power supply device based on alternating current voltage regulation according to claim 1, wherein the rectifying module (3) is a diode rectifying circuit.
6. The hydrogen generation power supply device based on alternating current voltage regulation according to claim 1, wherein the fixed step-down module (2) is a step-down transformer with a primary voltage higher than a secondary voltage and a primary current lower than a secondary current.
7. The hydrogen production power supply device based on ac voltage regulation according to any one of claims 1 to 6, characterized in that the input side of the high voltage ac voltage regulation module (1) is further provided with a filter loop.
8. The ac voltage-regulating based hydrogen generation power supply device according to any one of claims 1 to 6, wherein the output voltage regulation range of the high-voltage ac voltage-regulating module (1) is 0 to Un, the output dc voltage range of the rectifying module (3) is 0 to (Un x K1)/N, where Un is the ac power supply voltage to be connected, K1 is the proportionality coefficient of the rectifying module (3), N is the primary-secondary side turns ratio of the transformer in the fixed step-down module (2), and N >1.
9. A control method for the ac voltage-regulating-based hydrogen production power supply apparatus as claimed in any one of claims 1 to 8, characterized by comprising the steps of:
obtaining direct current voltage/current output by the rectifying module (3) and a given reference voltage/current value;
comparing the direct voltage/current output by the rectifying module (3) with a given reference voltage/current value;
and generating a control signal according to the comparison result to control and regulate the output of the high-voltage alternating current voltage regulating module (1) so that the output of the rectifying module (3) tracks the target voltage/current.
10. The control method according to claim 9, wherein the given reference voltage/current value is set according to a voltage regulation requirement of the electrolytic cell so that the hydrogen production power supply device outputs a direct current according to the requirement to the electrolytic cell.
11. The control method according to claim 9 or 10, characterized in that the output voltage of the rectifying module (3) is calculated according to the following formula:
wherein U is Ref For a given reference voltage U dc For the output voltage, K, of the rectifying module (3) p +K i And s is the transfer function of the PI control unit in the high-voltage alternating-current voltage regulating module (1),is the transfer function of the voltage regulating unit (102) in the high-voltage alternating current voltage regulating module (1), 1/N is the proportionality coefficient of the fixed voltage reducing module (2), N is the primary-secondary side turns ratio of the voltage reducing transformer in the fixed voltage reducing module (2), and N>And 1, K1 is the proportionality coefficient of the rectifying module (3).
CN202310652293.0A 2023-06-02 2023-06-02 Hydrogen production power supply device based on alternating current voltage regulation and control method thereof Pending CN116742965A (en)

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