CN113381624B - Hydrogen production power supply system, hydrogen production device and hydrogen production method - Google Patents

Hydrogen production power supply system, hydrogen production device and hydrogen production method Download PDF

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Publication number
CN113381624B
CN113381624B CN202110758418.9A CN202110758418A CN113381624B CN 113381624 B CN113381624 B CN 113381624B CN 202110758418 A CN202110758418 A CN 202110758418A CN 113381624 B CN113381624 B CN 113381624B
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China
Prior art keywords
alternating current
circuit
voltage
pulse width
width modulation
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CN202110758418.9A
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CN113381624A (en
Inventor
邹海晏
陶磊
吴云
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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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
    • H02M7/145—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 thyratron or thyristor type requiring extinguishing means
    • H02M7/155—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/1552—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a biphase or polyphase arrangement
    • 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
    • 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
    • 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
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • 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

Abstract

The application discloses a power supply system for hydrogen production, a device for hydrogen production and a method for hydrogen production, wherein the system comprises: a pulse width modulation rectifier and an ac/ac circuit; the input side of the alternating current/alternating current circuit is used for being connected with an alternating current power supply, and the output side of the alternating current/alternating current circuit is connected with the input side of the pulse width modulation rectifier; when the difference between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than the preset voltage, the alternating current/alternating current circuit stops working, and the input side of the pulse width modulation rectifier is connected with an alternating current power supply. Because the pulse width modulation rectifier can reduce harmonic current, the hydrogen production system does not need to be provided with an additional reactive compensation and resonance elimination device, and the hydrogen production cost is reduced. In order to avoid the influence of excessive impact current in the hydrogen production circuit on devices in the pulse width modulation rectifier, an alternating current/alternating current circuit is also used for carrying out gradual rising treatment after reducing the voltage input by the pulse width modulation rectifier.

Description

Hydrogen production power supply system, hydrogen production device and hydrogen production method
Technical Field
The application relates to the field of power supplies, in particular to a hydrogen production power supply system, a hydrogen production device and a hydrogen production method.
Background
In recent years, with the continuous aggravation of global environmental pollution, energy crisis, global warming and other problems, the hydrogen production technology is increasingly widely applied. Generally conventional hydrogen production processes require the use of direct current, and thus hydrogen production power sources typically need to include an ac/dc conversion circuit that requires rectifying the ac power to dc power.
Currently, hydrogen generation power supplies are typically implemented using thyristor phase-controlled rectifiers. The output direct-current voltage of the thyristor phase-control rectifier can be regulated by controlling the conduction angle of the thyristor, so that the input alternating current is rectified into direct current with controllable voltage.
However, the thyristor phase-controlled rectifier scheme in the prior art generates a large amount of reactive power when rectifying, and because the harmonic current content of the thyristor phase-controlled rectifier is large. In the using process of the thyristor phase control rectifier, reactive power compensation and harmonic elimination cannot be carried out, so that an additional reactive power compensation and harmonic elimination device is required to be equipped, and the power supply cost for hydrogen production is high.
Disclosure of Invention
In order to solve the technical problems, the application provides a hydrogen production power supply system, a hydrogen production device and a hydrogen production method, which can rectify by a pulse width modulation (PWM, pulse width modulation) rectifier without providing an additional reactive compensation device, thereby reducing the hydrogen production cost.
In order to achieve the above object, the technical solution provided in the embodiments of the present application is as follows:
the embodiment of the application provides a power supply system for hydrogen production, which comprises: a pulse width modulation rectifier and an ac/ac circuit;
the input side of the alternating current/alternating current circuit is used for being connected with an alternating current power supply, and the output side of the alternating current/alternating current circuit is connected with the input side of the pulse width modulation rectifier; the output side of the pulse width modulation rectifier is used for being connected with a hydrogen production tank;
the pulse width modulation rectifier is used for converting alternating current output by the alternating current/alternating current circuit into direct current;
the alternating current/alternating current circuit is used for gradually increasing the voltage of alternating current output by the alternating current power supply after the voltage is reduced and providing the alternating current/alternating current power supply for the pulse width modulation rectifier; when the difference between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage, the alternating current/alternating current circuit stops working, and the input side of the pulse width modulation rectifier is connected with the alternating current power supply.
In one possible implementation manner, the power supply system for hydrogen production provided in the embodiment of the present application further includes: a controller;
The controller is used for controlling the alternating current/alternating current circuit to step down the voltage of alternating current output by the alternating current power supply, gradually rise and supply the voltage to the pulse width modulation rectifier, and controlling the alternating current/alternating current circuit to stop working when the difference value between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage, and controlling the input side of the pulse width modulation rectifier to be connected with the alternating current power supply.
In one possible implementation manner, the power supply system for hydrogen production provided in the embodiment of the present application further includes: a branch switching circuit;
the first end of the branch switch circuit is connected with the input side of the alternating current/alternating current circuit, and the second end of the branch switch circuit is connected with the output side of the alternating current/alternating current circuit;
the controller is specifically configured to control the bypass switch circuit to be closed when a difference between an input voltage of the ac/ac circuit and an output voltage of the ac/ac circuit is smaller than the preset voltage, so that the ac/ac circuit is bypassed to exit the operation, and an input side of the pwm rectifier is connected to the ac power supply through the bypass switch circuit.
In one possible implementation manner, the power supply system for hydrogen production provided in the embodiment of the present application further includes: a series switch;
the first end of the series switch is connected with the first end of the branch switch circuit; a second end of the series switch is connected with an input side of the alternating current/alternating current circuit;
the controller is specifically configured to control the series switch to be turned off when a difference between an input voltage of the ac/ac circuit and an output voltage of the ac/ac circuit is smaller than a preset voltage; the ac/ac circuit is deactivated via the series switch.
In one possible implementation manner, the power supply system for hydrogen production provided in the embodiment of the present application further includes: a voltage detection circuit;
the voltage detection circuit is used for detecting the output voltage of the alternating current/alternating current circuit and the input voltage of the alternating current/alternating current circuit and sending the output voltage and the input voltage to the controller.
In a possible implementation manner, in the power supply system for producing hydrogen provided in the embodiment of the present application, when a difference between an input voltage phase of the ac/ac circuit and an output voltage phase of the ac/ac circuit is smaller than a preset voltage phase, a difference between an input voltage effective value of the ac/ac circuit and an output voltage effective value of the ac/ac circuit is smaller than a preset voltage effective value, the ac/ac circuit is taken out of operation, and an input side of the pulse width modulation rectifier is connected to the ac power supply.
In one possible implementation, the ac/ac circuit includes: any one of a thyristor phase-control AC-AC converter, a matrix converter and an AC-DC-AC converter.
In one possible implementation, the pwm rectifier operates in a pwm rectification mode;
or alternatively, the first and second heat exchangers may be,
the pwm rectifier operates in an uncontrolled rectifying mode.
In one possible implementation manner, when the pwm rectifier operates in the pwm rectification mode, the pwm rectifier is any one of the following:
single phase pwm rectifiers, two phase pwm rectifiers, three phase pwm rectifiers and four phase pwm rectifiers.
In one possible implementation manner, when the pwm rectifier operates in the pwm rectification mode, the pwm rectifier is any one of the following:
two-level pwm rectifiers, three-level pwm rectifiers, four-level pwm rectifiers, and five-level pwm rectifiers.
The embodiment of the application also provides a hydrogen production device, which comprises: a pulse width modulation rectifier, an alternating current/alternating current circuit and a hydrogen production tank;
The input side of the alternating current/alternating current circuit is used for being connected with an alternating current power supply, and the output side of the alternating current/alternating current circuit is connected with the input side of the pulse width modulation rectifier; the output side of the pulse width modulation rectifier is connected with the hydrogen production tank;
the pulse width modulation rectifier is used for converting alternating current output by the alternating current/alternating current circuit into direct current;
the alternating current/alternating current circuit is used for gradually increasing the voltage of alternating current output by the alternating current power supply after the voltage is reduced and providing the alternating current/alternating current power supply for the pulse width modulation rectifier; when the difference between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage, the alternating current/alternating current circuit stops working, and the input side of the pulse width modulation rectifier is connected with the alternating current power supply.
In one possible implementation manner, the embodiment of the application further includes: a controller;
the controller is used for controlling the alternating current/alternating current circuit to step down the voltage of alternating current output by the alternating current power supply, gradually rise and supply the voltage to the pulse width modulation rectifier, and controlling the alternating current/alternating current circuit to stop working when the difference value between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage, and controlling the input side of the pulse width modulation rectifier to be connected with the alternating current power supply.
In one possible implementation manner, the embodiment of the application further includes: a branch switching circuit;
the first end of the branch switch circuit is connected with the input side of the alternating current/alternating current circuit, and the second end of the branch switch circuit is connected with the output side of the alternating current/alternating current circuit;
the controller is specifically configured to control the bypass switch circuit to be closed when a difference between an input voltage of the ac/ac circuit and an output voltage of the ac/ac circuit is smaller than the preset voltage, so that the ac/ac circuit is bypassed to exit the operation, and an input side of the pwm rectifier is connected to the ac power supply through the bypass switch circuit.
The embodiment of the application also provides a hydrogen production method, which is applied to a hydrogen production power supply system, and comprises the following steps: a pulse width modulation rectifier and an ac/ac circuit; the input side of the alternating current/alternating current circuit is used for being connected with an alternating current power supply, and the output side of the alternating current/alternating current circuit is connected with the input side of the pulse width modulation rectifier; the output side of the pulse width modulation rectifier is used for being connected with a hydrogen production tank; the pulse width modulation rectifier is used for converting alternating current output by the alternating current/alternating current circuit into direct current; the alternating current/alternating current circuit is used for gradually increasing the voltage of alternating current output by the alternating current power supply after the voltage is reduced and providing the alternating current/alternating current power supply for the pulse width modulation rectifier; when the difference between the input voltage of the ac/ac circuit and the output voltage of the ac/ac circuit is smaller than a preset voltage, the ac/ac circuit is deactivated, and the input side of the pwm rectifier is connected to the ac power supply, the method includes:
Activating the pwm rectifier and the ac/ac circuit;
controlling the alternating current/alternating current circuit to step down the voltage of alternating current output by the alternating current power supply, gradually increasing the voltage and providing the voltage to the pulse width modulation rectifier;
when the difference between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage, the alternating current/alternating current circuit stops working, and the input side of the pulse width modulation rectifier is connected with the alternating current power supply;
the pulse width modulation rectifier dynamically adjusts the output voltage according to the hydrogen production amount requirement of the hydrogen production tank.
In one possible implementation, the hydrogen-producing power supply system further includes: a branch switching circuit; the first end of the branch switch circuit is connected with the input side of the alternating current/alternating current circuit, and the second end of the branch switch circuit is connected with the output side of the alternating current/alternating current circuit;
when the difference between the input voltage of the ac/ac circuit and the output voltage of the ac/ac circuit is smaller than a preset voltage, the ac/ac circuit is deactivated, and the input side of the pwm rectifier is connected to the ac power supply, including:
When the difference between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage, the branch switch circuit is controlled to be closed, so that the alternating current/alternating current circuit is bypassed to stop working, and the input side of the pulse width modulation rectifier is connected with the alternating current power supply through the branch switch circuit.
In one possible implementation, the enabling the pwm rectifier and the ac/ac circuit includes:
and starting the alternating current/alternating current circuit, and starting the pulse width modulation rectifier after the alternating current/alternating current circuit has output voltage.
In one possible implementation manner, when the difference between the input voltage of the ac/ac circuit and the output voltage of the ac/ac circuit is smaller than a preset voltage, the method specifically includes:
the output voltage of the pulse width modulation rectifier is larger than or equal to a threshold voltage, and when the difference between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage.
In one possible implementation, the threshold voltage is the lowest voltage that can be output after the pwm rectifier is operating stably.
In one possible implementation manner, when the difference between the input voltage of the ac/ac circuit and the output voltage of the ac/ac circuit is smaller than a preset voltage, the method specifically includes:
when the difference between the input voltage phase of the alternating current/alternating current circuit and the output voltage phase of the alternating current/alternating current circuit is smaller than the preset voltage phase, the difference between the effective value of the input voltage of the alternating current/alternating current circuit and the effective value of the output voltage of the alternating current/alternating current circuit is smaller than the preset voltage effective value.
According to the technical scheme, the application has the following beneficial effects:
embodiments of the present application provide a hydrogen production power supply system, a hydrogen production device and a hydrogen production method, where the system includes: a pulse width modulation rectifier and an ac/ac circuit; the input side of the alternating current/alternating current circuit is used for being connected with an alternating current power supply, and the output side of the alternating current/alternating current circuit is connected with the input side of the pulse width modulation rectifier; the output side of the pulse width modulation rectifier is used for being connected with a hydrogen production tank; the pulse width modulation rectifier is used for converting alternating current output by the alternating current/alternating current circuit into direct current; the alternating current/alternating current circuit is used for reducing the voltage of alternating current output by the alternating current power supply, gradually increasing the voltage, and providing the voltage to the pulse width modulation rectifier; when the difference between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than the preset voltage, the alternating current/alternating current circuit stops working, and the input side of the pulse width modulation rectifier is connected with an alternating current power supply.
Therefore, the power supply system, the device and the method for hydrogen production can reduce harmonic current by using the pulse width modulation rectifier, and can directly compensate reactive power in the pulse width modulation rectifier, and the hydrogen production system does not need to be provided with an additional reactive compensation device, so that the cost of hydrogen production is reduced. In addition, the application finds that the pulse width modulation rectifier can generate great impact current when being connected with the hydrogen production groove, in order to avoid the influence of excessive current in the hydrogen production circuit on devices in the pulse width modulation rectifier, an alternating current/alternating current circuit is also used for carrying out voltage step-down and gradual rise treatment on the voltage input by the pulse width modulation rectifier, so that the output voltage of the pulse width modulation rectifier can be gradually increased from small to large.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a power supply system for producing hydrogen according to an embodiment of the present application;
FIG. 2 is a schematic diagram of another power supply system for producing hydrogen according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a hydrogen production tank voltage/current V/I characteristic provided in an embodiment of the present application;
FIG. 4 is an equivalent schematic diagram of electrical characteristics of a hydrogen production tank according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a power supply system for producing hydrogen according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a power supply system for producing hydrogen according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a power supply system for producing hydrogen according to an embodiment of the present disclosure;
FIG. 8 is a schematic structural view of a hydrogen production apparatus according to an embodiment of the present disclosure;
fig. 9 is a flow chart of a method for producing hydrogen according to an embodiment of the present application.
Detailed Description
In order to better understand the solution provided by the embodiments of the present application, before describing the method provided by the embodiments of the present application, a scenario of application of the solution of the embodiments of the present application is described.
In recent years, with the continuous aggravation of global environmental pollution, energy crisis, global warming and other problems, the hydrogen production technology is increasingly widely applied. Generally conventional hydrogen production processes require the use of direct current, and thus hydrogen production power sources typically need to include an ac/dc conversion circuit that requires rectifying the ac power to dc power.
Currently, hydrogen generation power supplies are typically implemented using thyristor phase-controlled rectifiers. The output direct-current voltage of the thyristor phase-control rectifier can be regulated by controlling the conduction angle of the thyristor, so that the input alternating current is rectified into direct current with controllable voltage.
However, the thyristor phase-controlled rectifier scheme in the prior art generates a large amount of reactive power when rectifying, and because the harmonic current content of the thyristor phase-controlled rectifier is large. In the using process of the thyristor phase control rectifier, reactive power compensation and harmonic elimination cannot be carried out, so that an additional reactive power compensation and harmonic elimination device is required to be equipped, and the power supply cost for hydrogen production is high.
In order to solve the technical problems, the system and the device for producing hydrogen provided by the embodiment of the application can reduce harmonic current by using the pulse width modulation rectifier, and can directly compensate reactive power in the pulse width modulation rectifier, and the hydrogen production system does not need to be provided with an additional reactive compensation device, so that the cost of producing hydrogen is reduced. In addition, the application finds that the pulse width modulation rectifier can generate great impact current when being connected with the hydrogen production tank, in order to avoid the influence of excessive current in the hydrogen production circuit on devices in the pulse width modulation rectifier, an alternating current/alternating current circuit is also used for reducing the voltage input by the pulse width modulation rectifier and gradually increasing the voltage, so that the output voltage of the pulse width modulation rectifier can be gradually increased from small to large.
In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures and detailed description are described in further detail below.
Referring to fig. 1, a schematic structure of a power supply system for producing hydrogen according to the present application is shown.
As shown in fig. 1, a power supply system for producing hydrogen according to an embodiment of the present application includes: a pulse width modulation rectifier 200 and an ac/ac circuit 300;
the input side of the ac/ac circuit 300 is used for connecting to an ac power source, and the output side of the ac/ac circuit 300 is connected to the input side of the pwm rectifier 200; the output side of the pulse width modulation rectifier 200 is used for connecting with a hydrogen production tank;
a pwm rectifier 200 for converting the ac power output from the ac/ac circuit 300 into dc power;
an ac/ac circuit 300 for stepping down the voltage of the ac power output from the ac power supply, gradually stepping up the voltage, and supplying the voltage to the pwm rectifier 200; when the difference between the input voltage of the ac/ac circuit 300 and the output voltage of the ac/ac circuit 300 is smaller than the preset voltage, the ac/ac circuit 300 is deactivated, and the input side of the pwm rectifier 200 is connected to the ac power supply.
It should be understood that the ac/ac circuit 300 in the embodiment of the present application may gradually increase the voltage of the ac power outputted from the ac power supply after the voltage of the ac power is reduced, that is, after the ac power outputted from the ac power supply is reduced to approximately 0V, the voltage is gradually increased to a value having a difference from the input voltage of the ac/ac circuit 300 as a preset voltage. As an example, the input voltage of the ac/ac circuit 300 is 100V, the preset voltage is 3V, the output voltage of the ac/ac circuit 300 may be reduced to approximately 0V first, and then gradually increased from the voltage of 0V until the output voltage of the ac/ac circuit 300 is increased to 97V (the input voltage 100V of the ac/ac circuit 300 minus the preset voltage 3V), and the ac/ac circuit 300 is deactivated.
It should be noted that, in practical applications, a negative value may occur in the difference between the output voltage of the ac/ac circuit 300 and the input voltage of the ac/ac circuit 300. As a possible implementation manner, the difference between the output voltage of the ac/ac circuit 300 and the input voltage of the ac/ac circuit 300 in the embodiment of the present application is smaller than the preset voltage, which may also include: the absolute value of the difference between the output voltage of the ac/ac circuit 300 and the input voltage of the ac/ac circuit 300 is smaller than the preset voltage.
Referring to fig. 2, a schematic structural diagram of another power supply system for producing hydrogen according to an embodiment of the present application is shown.
In the embodiment of the present application, as a possible implementation manner, the power supply system for producing hydrogen may further include: a controller 100; the controller 100 is configured to control the ac/ac circuit 300 to step down the voltage of the ac power output by the ac power supply, gradually increase the voltage, and provide the voltage to the pwm rectifier 200, and when the difference between the input voltage of the ac/ac circuit 300 and the output voltage of the ac/ac circuit 300 is smaller than a preset voltage, control the ac/ac circuit 300 to operate, and control the input side of the pwm rectifier 200 to be connected to the ac power supply.
It can be understood that the technical scheme in the embodiment of the application adopts the pulse width modulation rectifier to convert the alternating current into the direct current, so that the reactive power consumed by a hydrogen production power supply system can be reduced, and the power grid is more friendly.
In this embodiment of the present application, when the difference between the input voltage phase of the ac/ac circuit and the output voltage phase of the ac/ac circuit is smaller than the preset voltage phase, the difference between the input voltage effective value of the ac/ac circuit and the output voltage effective value of the ac/ac circuit is smaller than the preset voltage effective value, the ac/ac circuit is out of operation, and the input side of the pwm rectifier is connected to the ac power supply. It should be understood that the scheme provided by the embodiment of the application can determine whether the ac/ac circuit needs to be taken out of operation through at least one of the phase, the effective value and the amplitude of the ac, and the input side of the pwm rectifier is connected to the ac power supply. In the embodiment of the application, the alternating current/alternating current circuit steps down the voltage of alternating current output by the alternating current power supply, gradually increases the voltage and provides the voltage to the pulse width modulation rectifier, so that the output voltage of the pulse width modulation rectifier can gradually increase from small to large. In this embodiment, the pwm rectifier may operate in an uncontrolled rectification mode during a gradual rise in the ac/ac circuit output after the voltage step-down, and the output voltage of the pwm rectifier may rise as the ac/ac circuit output voltage rises.
It should be appreciated that the voltage output by the ac/ac circuit at the beginning of operation may be approximately 0V and then gradually increase from small to large until the difference between the input voltage phase of the ac/ac circuit and the output voltage phase of the ac/ac circuit is less than the preset voltage phase, and the difference between the effective value of the input voltage of the ac/ac circuit and the effective value of the output voltage of the ac/ac circuit is less than the preset voltage effective value.
As a possible implementation manner, the power supply system for hydrogen production in the embodiment of the present application may further include: a voltage detection circuit; the voltage detection circuit is used for detecting the output voltage of the alternating current/alternating current circuit and the input voltage of the alternating current/alternating current circuit and sending the output voltage and the input voltage to the controller. It should be noted that the PWM rectifier in the embodiments of the present application may be a two-phase PWM rectifier, a three-phase PWM rectifier, or a PWM rectifier with other phase numbers. The phase number of the PWM rectifier is not limited in the embodiment of the present application, and of course, the level number of the PWM rectifier is not limited.
Referring to fig. 3, a schematic diagram of a hydrogen production tank voltage/current V/I characteristic is provided in an embodiment of the present application.
The abscissa of the graph is the current I of the hydrogen production tank, and the ordinate is the voltage V of the hydrogen production tank. The graph shows the current-voltage characteristics of the hydrogen production tank. As shown in fig. 3, the present application found that the current-voltage characteristics of the hydrogen production tank were approximately linear when the voltage of the hydrogen production tank was less than the breakover voltage Vt. Therefore, the technical scheme of the application equivalent the electrical characteristics of the hydrogen production tank to a variable capacitor and a variable resistor in parallel. As a possible implementation manner, the controller in the embodiment of the present application is further configured to control the output voltage of the pwm rectifier. It should be appreciated that the controller in the embodiments of the present application controls the output voltage of the pwm rectifier to be less than the breakover voltage Vt when the ac/ac circuit has not been deactivated; when the ac/ac circuit is out of operation, the controller in the embodiment of the present application may control the output voltage of the pwm rectifier to be greater than the breakover voltage Vt in order to increase the hydrogen production efficiency of the hydrogen production tank.
Referring to fig. 4, an electrical characteristic equivalent schematic diagram of a hydrogen production tank according to an embodiment of the present application is shown.
As shown in fig. 4, the hydrogen production tank in the embodiment of the present application is equivalent to a capacitor C connected in parallel to a resistor R, where the capacitor C may be a capacitor with a variable capacitance, and the resistor R may be a resistor with a variable resistance. It will be appreciated that when the output side of the pwm rectifier is connected to both inputs of the hydrogen generating tank, the amount of charge due to the capacitor C at this time is 0. Thus, at the moment the output side of the pwm rectifier is connected to the hydrogen generating tank, the output side of the pwm rectifier will be shorted by the capacitor C, and a large rush current will be generated in the loop of the output side of the pwm rectifier, which will damage the devices in the pwm rectifier, such as the power switching transistor devices or switching devices.
Therefore, in order to avoid that the device in the pulse width modulation rectifier is influenced by excessive impact current in the hydrogen production circuit, the embodiment of the application also uses the voltage step-down and gradual step-up treatment of the alternating current/alternating current circuit on the voltage input by the pulse width modulation rectifier. It should be understood that, because the ac/ac circuit can control the output voltage thereof, before the input end of the pwm rectifier in the embodiment of the present application is connected to the ac power supply, the ac/ac circuit is used to step down the voltage of the ac power supply output ac and then gradually increase the voltage, so that the output voltage of the pwm rectifier in the present application gradually increases from small to large, and thus charges the hydrogen production tank without generating a large impact current, and the voltage of the equivalent capacitor C in the hydrogen production tank gradually increases.
It will be appreciated that the purpose of controlling the connection of the input side of the pwm rectifier to the ac power supply is to avoid unnecessary shocks of the pwm rectifier due to abrupt changes in the voltage at the input side thereof until the difference between the input voltage of the ac/ac circuit and the output voltage of the ac/ac circuit is less than a predetermined voltage.
In this way, the solution provided by the present application can protect the devices in the system from damaging by the impact current.
Referring to fig. 5, a schematic structural diagram of another power supply system for producing hydrogen according to an embodiment of the present application is shown.
Considering that when the difference between the input voltage of the ac/ac circuit and the output voltage of the ac/ac circuit is smaller than the preset voltage, the ac/ac circuit needs to be controlled to be out of operation, and the input side of the pwm rectifier is controlled to be connected to the ac power supply, as a possible implementation manner, the hydrogen production system provided by the embodiment of the present application may further include: and a branch switching circuit K.
As shown in fig. 5, a first end of the branch switching circuit K is connected to an input side of the ac/ac circuit 300, and a second end of the branch switching circuit K is connected to an output side of the ac/ac circuit 300;
accordingly, the controller in the embodiment of the present application is specifically configured to control the bypass switch circuit K to be closed when the difference between the input voltage of the ac/ac circuit 300 and the output voltage of the ac/ac circuit 300 is smaller than the preset voltage, so that the ac/ac circuit 300 is bypassed and short-circuited to exit the operation, and the pwm rectifier 200 is connected to the ac power supply through the bypass switch circuit K. It should be noted that, the controller in the embodiment of the present application is omitted and is not illustrated in fig. 5, but the on or off of the bypass switch circuit in the embodiment of the present application is controlled by the controller.
Referring to fig. 6, a schematic structural diagram of another power supply system for producing hydrogen according to an embodiment of the present application is shown.
As one possible implementation manner, the system for producing hydrogen provided in the embodiment of the present application may further include: and a series switch Q.
The first end of the series switch Q is connected with the first end of the branch switch circuit K; a second terminal of the series switch Q is connected to an input side of the ac/ac circuit 300;
a controller, specifically configured to control the series switch Q to be turned off when a difference between an input voltage of the ac/ac circuit 300 and an output voltage of the ac/ac circuit 300 is smaller than a preset voltage; the ac/ac circuit 300 is deactivated by the series switch. It should be understood that the ac/ac circuit 300 is still connected to the ac power supply after the hydrogen-making power supply system enters into normal operation, and the ac/ac circuit 300 may consume power to affect the operation of subsequent circuits, so in the embodiment of the present application, after the ac/ac circuit 300 is shorted, the ac/ac circuit is disconnected from the ac power supply by the series switch Q, so that the ac/ac circuit 300 is completely removed from operation, and the consumption of redundant power or the influence on other devices is avoided.
In an embodiment of the present application, in order to control the output current of the ac/ac circuit, the controller may be specifically configured to control the output current of the ac/ac circuit to be less than the threshold current; the threshold current is the maximum current allowed by the ac/ac circuit. It will be appreciated that the controller may control the output current of the ac/ac circuit to be less than a threshold current, which is the maximum current allowed by the ac/ac circuit, in order that the current at the output side of the ac/ac circuit does not damage devices in the circuit. Further, for convenience in controlling the output circuit of the ac/ac circuit, the controller may be specifically configured to control the output current of the ac/ac circuit to be a constant value.
In the embodiment of the application, the preset voltage should be smaller in order to stop the ac/ac circuit. It should be appreciated that this is to avoid unnecessary shocks of the pwm rectifier due to abrupt changes in the voltage at its input side.
As an example, the ac/ac circuit in embodiments of the present application may be a thyristor phase-controlled ac-to-ac converter. As another example, the ac/ac circuit in the embodiment of the present application may be a matrix conversion circuit. It should be understood that the embodiment of the present application is not limited to a specific form of ac/ac circuit, and the ac/ac circuit in the embodiment of the present application may be any circuit capable of controlling the magnitude of the output ac voltage.
It should be noted that, the bypass switching circuit in the embodiments of the present application may be a single switching device, or may be a switch formed by combining a plurality of switching devices, which is not limited herein. The alternating current/alternating current circuit in the embodiment of the application comprises: any one of a thyristor phase-control AC-AC converter, a matrix converter and an AC-DC-AC converter.
Referring to fig. 7, a schematic structural diagram of a power supply system for producing hydrogen according to an embodiment of the present application is shown.
As shown in fig. 7, the power supply system for hydrogen production provided in the embodiment of the present application includes a pulse width modulation rectifier 200, an ac/ac circuit 300, and a bypass switching circuit K.
The input side of the ac/ac circuit 300 is connected to an ac power supply, and only a three-phase three-level ac power supply is taken as an example in the drawing, and the number of phases of the ac power supply is not limited in the embodiments of the present application, and the number of levels of the PWM rectifier is not limited. The ac/ac circuit 300 and the branch switching circuit K are connected in parallel and then connected to the input side of the pwm rectifier 200, and when the branch switching circuit K is turned off, the pwm rectifier 200 and the ac/ac circuit 300 are connected in series; when the bypass switching circuit K is closed, the ac/ac circuit 300 is shorted and the pwm rectifier 200 is directly connected to the ac power supply.
In the embodiment of the application, the pulse width modulation rectifier works in a pulse width modulation rectification mode; alternatively, the pwm rectifier operates in an uncontrolled rectifying mode. In this embodiment, when the pwm rectifier operates in the pwm rectification mode, the pwm rectifier is any one of the following: single phase pwm rectifiers, two phase pwm rectifiers, three phase pwm rectifiers and four phase pwm rectifiers. In this embodiment, when the pwm rectifier operates in the pwm rectification mode, the pwm rectifier is any one of the following: two-level pwm rectifiers, three-level pwm rectifiers, four-level pwm rectifiers, and five-level pwm rectifiers.
It will be appreciated that the power system of fig. 7, which illustrates hydrogen production, may be connected to the output side of pwm rectifier 200 prior to start-up. When starting, the pulse width modulation rectifier 200 realizes an uncontrollable rectification operation mode through a diode which is reversely connected in parallel with the IGBT of the power device; the ac/ac circuit 300 operates in a phase-controlled ac mode, i.e., the control of the magnitude of the output voltage is achieved by controlling the conduction angle of each thyristor.
When the output voltage of the ac/ac circuit 300 increases gradually from 0, the output voltage of the pwm rectifier 200 (which performs the uncontrollable rectifying operation by the anti-parallel diode of the IGBT) increases synchronously, that is, the voltage of the hydrogen production tank connected to the output side of the pwm rectifier 200 increases synchronously.
When the input voltage and the output voltage of the ac/ac circuit 300 are consistent, that is, when each thyristor in the ac/ac circuit 300 runs at a full conduction angle, the branch switch circuit K is closed, the ac/ac circuit 300 is taken out of operation, the voltage on the input side of the pwm rectifier 200 does not break before and after the input side is connected to the ac power supply through the branch switch circuit K, that is, no impact current is generated at the moment when the branch switch circuit K is closed. After the branch switch circuit K is closed, the pwm rectifier 200 operates in the pwm rectification mode, and then dynamically adjusts the output voltage according to the hydrogen output of the hydrogen production tank.
In summary, the system for producing hydrogen provided by the embodiment of the application can reduce harmonic current by using the pulse width modulation rectifier, and can directly compensate reactive power in the pulse width modulation rectifier, so that the system for producing hydrogen does not need to be provided with an additional reactive compensation device, and the cost of producing hydrogen is reduced. In addition, the application finds that the pulse width modulation rectifier can generate great impact current when being connected with the hydrogen production tank, in order to avoid the influence of excessive current in the hydrogen production circuit on devices in the pulse width modulation rectifier, an alternating current/alternating current circuit is also used for reducing the voltage input by the pulse width modulation rectifier and gradually increasing the voltage, so that the output voltage of the pulse width modulation rectifier can be gradually increased from small to large.
According to the power supply system for hydrogen production provided by the embodiment, the embodiment of the application also provides a device for hydrogen production.
Referring to fig. 8, a schematic structural diagram of an apparatus for producing hydrogen according to an embodiment of the present application is shown.
As shown in fig. 8, the hydrogen production apparatus in the embodiment of the present application includes: pulse width modulated rectifier 200, ac/ac circuit 300, and hydrogen production tank 400;
the input side of the ac/ac circuit 300 is used for connecting to an ac power source, and the output side of the ac/ac circuit 300 is connected to the input side of the pwm rectifier 200; the output side of the pulse width modulation rectifier 200 is connected with a hydrogen production tank 400;
A pwm rectifier 200 for converting the ac power output from the ac/ac circuit 300 into dc power;
an ac/ac circuit 300 for stepping down the voltage of the ac power output from the ac power supply, gradually stepping up the voltage, and supplying the voltage to the pwm rectifier 200; when the difference between the input voltage of the ac/ac circuit 300 and the output voltage of the ac/ac circuit 300 is smaller than the preset voltage, the ac/ac circuit 300 is deactivated, and the input side of the pwm rectifier 200 is connected to the ac power supply.
In this embodiment, as a possible implementation manner, the apparatus for producing hydrogen further includes: a controller; and the controller is used for controlling the alternating current/alternating current circuit to step down the voltage of the alternating current output by the alternating current power supply, gradually increasing the voltage and providing the voltage to the pulse width modulation rectifier, and controlling the alternating current/alternating current circuit to stop working when the difference value between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage, and controlling the input side of the pulse width modulation rectifier to be connected with the alternating current power supply.
In this embodiment, as a possible implementation manner, the apparatus for producing hydrogen further includes: a branch switching circuit; the first end of the branch switching circuit is connected with the input side of the alternating current/alternating current circuit, and the second end of the branch switching circuit is connected with the output side of the alternating current/alternating current circuit; and the controller is specifically used for controlling the branch switch circuit to be closed when the difference between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage, so that the alternating current/alternating current circuit is bypassed to stop working, and the input side of the pulse width modulation rectifier is connected with an alternating current power supply through the branch switch circuit.
As one possible implementation manner, the device for producing hydrogen in the embodiment of the application further includes: a series switch; the first end of the series switch is connected with the first end of the branch switch circuit; the second end of the series switch is connected with the input side of the alternating current/alternating current circuit; the controller is specifically used for controlling the series switch to be disconnected when the difference value between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage; the ac/ac circuit is deactivated by the series switch.
In summary, the device for producing hydrogen provided by the embodiment of the application can reduce harmonic current by using the pulse width modulation rectifier, and can directly compensate reactive power in the pulse width modulation rectifier, so that the hydrogen production system does not need to be provided with an additional reactive compensation device, and the cost of producing hydrogen is reduced. In addition, the application finds that the pulse width modulation rectifier can generate great impact current when being connected with the hydrogen production tank, in order to avoid the influence of excessive current in the hydrogen production circuit on devices in the pulse width modulation rectifier, an alternating current/alternating current circuit is also used for reducing the voltage input by the pulse width modulation rectifier and gradually increasing the voltage, so that the output voltage of the pulse width modulation rectifier can be gradually increased from small to large.
According to the power supply system and the device for hydrogen production provided by the embodiment, the embodiment of the application also provides a method for hydrogen production.
Referring to fig. 9, a flow chart of a method for producing hydrogen is provided in an embodiment of the present application.
As shown in fig. 9, the method for producing hydrogen provided in the embodiment of the present application is applied to a power supply system for producing hydrogen, where the power supply system for producing hydrogen includes: a pulse width modulation rectifier and an ac/ac circuit; the input side of the alternating current/alternating current circuit is used for being connected with an alternating current power supply, and the output side of the alternating current/alternating current circuit is connected with the input side of the pulse width modulation rectifier; the output side of the pulse width modulation rectifier is used for being connected with a hydrogen production tank; the pulse width modulation rectifier is used for converting alternating current output by the alternating current/alternating current circuit into direct current; the alternating current/alternating current circuit is used for reducing the voltage of alternating current output by the alternating current power supply, gradually increasing the voltage, and providing the voltage to the pulse width modulation rectifier; when the difference between the input voltage of the AC/AC circuit and the output voltage of the AC/AC circuit is smaller than the preset voltage, the AC/AC circuit stops working, and the input side of the pulse width modulation rectifier is connected with an AC power supply, the method comprises the following steps:
S901: the pwm rectifier and ac/ac circuit are enabled.
S902: the AC/AC circuit is controlled to step down the voltage of the AC power outputted by the AC power supply, gradually increase the voltage and supply the voltage to the pulse width modulation rectifier.
S903: when the difference between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than the preset voltage, the alternating current/alternating current circuit stops working, and the input side of the pulse width modulation rectifier is connected with an alternating current power supply.
S904: the pulse width modulation rectifier dynamically adjusts the output voltage according to the hydrogen production amount requirement of the hydrogen production tank.
As one possible implementation, the power supply system for producing hydrogen further includes: a branch switching circuit; the first end of the branch switch circuit is connected with the input side of the alternating current/alternating current circuit, and the second end of the branch switch circuit is connected with the output side of the alternating current/alternating current circuit. When the difference between the input voltage of the AC/AC circuit and the output voltage of the AC/AC circuit is smaller than the preset voltage, the AC/AC circuit stops working, the input side of the pulse width modulation rectifier is connected with an AC power supply, and the method comprises the following steps: when the difference between the input voltage of the AC/AC circuit and the output voltage of the AC/AC circuit is smaller than the preset voltage, the branch switch circuit is controlled to be closed, so that the AC/AC circuit is bypassed to stop working, and the input side of the pulse width modulation rectifier is connected with an AC power supply through the branch switch circuit.
As one possible implementation, the start-up pwm rectifier and the ac/ac circuit, comprises: the AC/AC circuit is started, and after the AC/AC circuit has output voltage, the pulse width modulation rectifier is started.
As one possible implementation manner, when the difference between the input voltage of the ac/ac circuit and the output voltage of the ac/ac circuit is smaller than a preset voltage, the method specifically includes: the output voltage of the pulse width modulation rectifier is larger than or equal to the threshold voltage, and when the difference between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than the preset voltage.
As a possible implementation, the threshold voltage is the lowest voltage that can be output after the pwm rectifier is operating stably.
As one possible implementation manner, when the difference between the input voltage of the ac/ac circuit and the output voltage of the ac/ac circuit is smaller than a preset voltage, the method specifically includes: when the difference between the input voltage phase of the AC/AC circuit and the output voltage phase of the AC/AC circuit is smaller than the preset voltage phase, the difference between the effective value of the input voltage of the AC/AC circuit and the effective value of the output voltage of the AC/AC circuit is smaller than the preset voltage effective value.
From the above description of embodiments, it will be apparent to those skilled in the art that all or part of the steps of the above described example methods may be implemented in software plus necessary general purpose hardware platforms. Based on such understanding, the technical solutions of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to perform the method of the embodiments or parts of the embodiments of the present application.
It should be noted that, in the present description, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different manner from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the method disclosed in the embodiment, since it corresponds to the system disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the system part.
It should also be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing description of the disclosed embodiments, as well as many modifications to those embodiments to enable any person skilled in the art to make or use the disclosure, will be readily apparent to those of ordinary skill in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (19)

1. A power supply system for producing hydrogen, comprising: a pulse width modulation rectifier and an ac/ac circuit;
the input side of the alternating current/alternating current circuit is used for being connected with an alternating current power supply, and the output side of the alternating current/alternating current circuit is connected with the input side of the pulse width modulation rectifier; the output side of the pulse width modulation rectifier is used for being connected with a hydrogen production tank;
the pulse width modulation rectifier is used for converting alternating current output by the alternating current/alternating current circuit into direct current;
the alternating current/alternating current circuit is used for gradually increasing the voltage of alternating current output by the alternating current power supply after reducing the voltage and providing the alternating current/alternating current power supply for the pulse width modulation rectifier; when the difference between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage, the alternating current/alternating current circuit stops working, and the input side of the pulse width modulation rectifier is connected with the alternating current power supply.
2. The system of claim 1, further comprising: a controller;
the controller is used for controlling the alternating current/alternating current circuit to step down the voltage of alternating current output by the alternating current power supply, gradually rise and supply the voltage to the pulse width modulation rectifier, and controlling the alternating current/alternating current circuit to stop working when the difference value between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage, and controlling the input side of the pulse width modulation rectifier to be connected with the alternating current power supply.
3. The system of claim 2, further comprising: a branch switching circuit;
the first end of the branch switch circuit is connected with the input side of the alternating current/alternating current circuit, and the second end of the branch switch circuit is connected with the output side of the alternating current/alternating current circuit;
the controller is specifically configured to control the bypass switch circuit to be closed when a difference between an input voltage of the ac/ac circuit and an output voltage of the ac/ac circuit is smaller than the preset voltage, so that the ac/ac circuit is bypassed to exit the operation, and an input side of the pwm rectifier is connected to the ac power supply through the bypass switch circuit.
4. A system according to claim 3, further comprising: a series switch;
the first end of the series switch is connected with the first end of the branch switch circuit; a second end of the series switch is connected with an input side of the alternating current/alternating current circuit;
the controller is specifically configured to control the series switch to be turned off when a difference between an input voltage of the ac/ac circuit and an output voltage of the ac/ac circuit is smaller than a preset voltage; the ac/ac circuit is deactivated via the series switch.
5. The system of claim 2, further comprising: a voltage detection circuit;
the voltage detection circuit is used for detecting the output voltage of the alternating current/alternating current circuit and the input voltage of the alternating current/alternating current circuit and sending the output voltage and the input voltage to the controller.
6. The system of claim 1, wherein the ac/ac circuit is deactivated when a difference between an input voltage phase of the ac/ac circuit and an output voltage phase of the ac/ac circuit is less than a predetermined voltage phase, a difference between an input voltage effective value of the ac/ac circuit and an output voltage effective value of the ac/ac circuit is less than a predetermined voltage effective value, and an input side of the pwm rectifier is connected to the ac power supply.
7. The system of any one of claims 1 to 6, wherein the ac/ac circuit comprises: any one of a thyristor phase-control AC-AC converter, a matrix converter and an AC-DC-AC converter.
8. The system of claim 1, wherein the pwm rectifier operates in a pwm rectification mode;
or alternatively, the first and second heat exchangers may be,
The pwm rectifier operates in an uncontrolled rectifying mode.
9. The system of claim 2, wherein the pwm rectifier is operated in a pwm rectification mode, the pwm rectifier being any of:
single phase pwm rectifiers, two phase pwm rectifiers, three phase pwm rectifiers and four phase pwm rectifiers.
10. The system of claim 2, wherein the pwm rectifier is operated in a pwm rectification mode, the pwm rectifier being any of:
two-level pwm rectifiers, three-level pwm rectifiers, four-level pwm rectifiers, and five-level pwm rectifiers.
11. An apparatus for producing hydrogen, comprising: a pulse width modulation rectifier, an alternating current/alternating current circuit and a hydrogen production tank;
the input side of the alternating current/alternating current circuit is used for being connected with an alternating current power supply, and the output side of the alternating current/alternating current circuit is connected with the input side of the pulse width modulation rectifier; the output side of the pulse width modulation rectifier is connected with the hydrogen production tank;
The pulse width modulation rectifier is used for converting alternating current output by the alternating current/alternating current circuit into direct current;
the alternating current/alternating current circuit is used for gradually increasing the voltage of alternating current output by the alternating current power supply after the voltage is reduced and providing the alternating current/alternating current power supply for the pulse width modulation rectifier; when the difference between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage, the alternating current/alternating current circuit stops working, and the input side of the pulse width modulation rectifier is connected with the alternating current power supply.
12. The apparatus as recited in claim 11, further comprising: a controller;
the controller is used for controlling the alternating current/alternating current circuit to step down the voltage of alternating current output by the alternating current power supply, gradually rise and supply the voltage to the pulse width modulation rectifier, and controlling the alternating current/alternating current circuit to stop working when the difference value between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage, and controlling the input side of the pulse width modulation rectifier to be connected with the alternating current power supply.
13. The apparatus as recited in claim 12, further comprising: a branch switching circuit;
The first end of the branch switch circuit is connected with the input side of the alternating current/alternating current circuit, and the second end of the branch switch circuit is connected with the output side of the alternating current/alternating current circuit;
the controller is specifically configured to control the bypass switch circuit to be closed when a difference between an input voltage of the ac/ac circuit and an output voltage of the ac/ac circuit is smaller than the preset voltage, so that the ac/ac circuit is bypassed to exit the operation, and an input side of the pwm rectifier is connected to the ac power supply through the bypass switch circuit.
14. A method of producing hydrogen, the method being applied to a power system for producing hydrogen, the power system for producing hydrogen comprising: a pulse width modulation rectifier and an ac/ac circuit; the input side of the alternating current/alternating current circuit is used for being connected with an alternating current power supply, and the output side of the alternating current/alternating current circuit is connected with the input side of the pulse width modulation rectifier; the output side of the pulse width modulation rectifier is used for being connected with a hydrogen production tank; the pulse width modulation rectifier is used for converting alternating current output by the alternating current/alternating current circuit into direct current; the alternating current/alternating current circuit is used for gradually increasing the voltage of alternating current output by the alternating current power supply after the voltage is reduced and providing the alternating current/alternating current power supply for the pulse width modulation rectifier; when the difference between the input voltage of the ac/ac circuit and the output voltage of the ac/ac circuit is smaller than a preset voltage, the ac/ac circuit is deactivated, and the input side of the pwm rectifier is connected to the ac power supply, the method includes:
Activating the pwm rectifier and the ac/ac circuit;
controlling the alternating current/alternating current circuit to step down the voltage of alternating current output by the alternating current power supply, gradually increasing the voltage and providing the voltage to the pulse width modulation rectifier;
when the difference between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage, the alternating current/alternating current circuit stops working, and the input side of the pulse width modulation rectifier is connected with the alternating current power supply;
the pulse width modulation rectifier dynamically adjusts the output voltage according to the hydrogen production amount requirement of the hydrogen production tank.
15. The method of claim 14, wherein the hydrogen-producing power supply system further comprises: a branch switching circuit; the first end of the branch switch circuit is connected with the input side of the alternating current/alternating current circuit, and the second end of the branch switch circuit is connected with the output side of the alternating current/alternating current circuit;
when the difference between the input voltage of the ac/ac circuit and the output voltage of the ac/ac circuit is smaller than a preset voltage, the ac/ac circuit is deactivated, and the input side of the pwm rectifier is connected to the ac power supply, including:
When the difference between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage, the branch switch circuit is controlled to be closed, so that the alternating current/alternating current circuit is bypassed to stop working, and the input side of the pulse width modulation rectifier is connected with the alternating current power supply through the branch switch circuit.
16. The method of claim 14, wherein said enabling said pwm rectifier and said ac/ac circuit comprises:
and starting the alternating current/alternating current circuit, and starting the pulse width modulation rectifier after the alternating current/alternating current circuit has output voltage.
17. The method according to claim 14, wherein when the difference between the input voltage of the ac/ac circuit and the output voltage of the ac/ac circuit is smaller than a preset voltage, specifically comprising:
the output voltage of the pulse width modulation rectifier is larger than or equal to a threshold voltage, and when the difference between the input voltage of the alternating current/alternating current circuit and the output voltage of the alternating current/alternating current circuit is smaller than a preset voltage.
18. The method of claim 17, wherein the threshold voltage is a minimum voltage that the pwm rectifier can output after stable operation.
19. The method according to any one of claims 14 to 18, wherein said step of when the difference between the input voltage of said ac/ac circuit and the output voltage of said ac/ac circuit is less than a preset voltage, comprises in particular:
when the difference between the input voltage phase of the alternating current/alternating current circuit and the output voltage phase of the alternating current/alternating current circuit is smaller than the preset voltage phase, the difference between the effective value of the input voltage of the alternating current/alternating current circuit and the effective value of the output voltage of the alternating current/alternating current circuit is smaller than the preset voltage effective value.
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CN112410801A (en) * 2021-01-22 2021-02-26 四川大学 Water electrolysis hydrogen production system of current source type PWM rectifier and control method
WO2021082423A1 (en) * 2019-10-28 2021-05-06 阳光电源股份有限公司 Direct-current coupling hydrogen production system and control method therefor
CN112953268A (en) * 2021-01-29 2021-06-11 上海师范大学 Hydrogen production converter topological structure suitable for being connected into single-phase alternating current system and control method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02197263A (en) * 1989-01-23 1990-08-03 Fuji Electric Co Ltd Pulse width modulation control system for ac/dc converter
JP2007249341A (en) * 2006-03-14 2007-09-27 Hitachi Ltd Hydrogen production system
CN102185496A (en) * 2011-05-20 2011-09-14 上海交通大学 AC-DC converter with bidirectional energy flow
EP3211782A1 (en) * 2016-02-24 2017-08-30 Hydrogenics Europe NV Configurable ac dc converter
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