CN115276433A - Hydrogen production converter - Google Patents

Hydrogen production converter Download PDF

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Publication number
CN115276433A
CN115276433A CN202210988357.XA CN202210988357A CN115276433A CN 115276433 A CN115276433 A CN 115276433A CN 202210988357 A CN202210988357 A CN 202210988357A CN 115276433 A CN115276433 A CN 115276433A
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module
current
input end
igbt
output end
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Chinese (zh)
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赵国鹏
李啸寅
徐衍会
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North China Electric Power University
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North China Electric Power University
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Priority to CN202210988357.XA priority Critical patent/CN115276433A/en
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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
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • 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
    • H02M5/10—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 transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • 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 invention relates to a hydrogen production converter, which belongs to the field of hydrogen production converters, and comprises a transformer, a thyristor rectifier stage, an IGBT inverter stage and a circulation suppression circuit, wherein the advantages of a power electronic non-full-control device and a full-control device are comprehensively considered, the topology of hybrid rectification of the transformer, the thyristor and the IGBT is adopted to realize low-voltage heavy current output, and the circulation suppression circuit is adopted to realize the circulation suppression of the hydrogen production converter.

Description

Hydrogen production converter
Technical Field
The invention relates to the field of hydrogen production converters, in particular to a hydrogen production converter.
Background
In recent years, power generation technologies based on renewable energy sources such as photovoltaic and wind power are rapidly developed, but the photovoltaic and the wind power are greatly influenced by external environments, have the characteristics of volatility and intermittency, and are difficult to be absorbed by a power system. But the perfect combination of green power generation and power utilization can be realized by utilizing renewable energy sources to produce hydrogen, and the aim of zero emission of carbon can be fulfilled. A hydrogen production converter is needed between the renewable energy source and the electrolytic cell to convert energy and then generate low-voltage large-current input needed by electrolysis.
For the research of hydrogen production current transformer, there are currently researches: a method for producing hydrogen by direct-current coupling photovoltaic of a DC-DC converter under the conditions of grain rain and scientific technology innovation is discussed [ J ], a theoretical analysis and design method of the system for producing hydrogen by direct-current coupling of the photovoltaic DC/DC converter is provided, and the design of the converter and the impedance matching of the converter and an electrolytic cell are deeply discussed. Zhouyinging, rongyurong, rongqingyan.based on coupling inductance, the staggered high step-down ratio DC/DC hydrogen production converter [ J ] integrates smart energy, provides a staggered topology capable of reducing the voltage stress of elements, and the high step-down ratio DC/DC converter can be applied to a photovoltaic hydrogen production system, thereby being beneficial to improving the efficiency of the photovoltaic hydrogen production system. The topological structure of a high-power hydrogen production converter and a control strategy thereof are researched by a power electronic technology, and a multi-module parallel Buck converter for a high-power electrolytic cell is provided, and current instructions are distributed in real time, delay angle increment is updated by detecting the running state updating parameters of all branches and controlling the number of the calculated branches, and automatic staggered control is actively realized. However, the topology proposed by the above research has no universality under the condition of high-power hydrogen production, and may have the problems of low input power at the network side, large ripple at the output low frequency at the load side, and the like. Meanwhile, the large-capacity hydrogen production converter needs to be connected in parallel to have the problem of circulating current, and the researches do not relate to the inhibition of the circulating current of the converter.
Disclosure of Invention
The invention aims to provide a hydrogen production converter to realize circulation suppression of the hydrogen production converter.
In order to achieve the purpose, the invention provides the following scheme:
a hydrogen production converter, comprising: the circuit comprises a transformer, a thyristor rectifier stage, an IGBT inverter stage and a circulating current suppression circuit;
the primary coil of the transformer is connected with a power grid, and the secondary coil of the transformer is respectively connected with the input end of the thyristor rectification stage and the input end of the IGBT rectification stage;
the output end of the thyristor rectification stage is connected with the electrolytic cell, and the thyristor rectification stage is used for generating current required by electrolysis of the electrolytic cell according to the three-phase input current to supply power to the electrolytic cell;
the output end of the IGBT rectifying stage is connected with the input end of the IGBT inverter stage, and the IGBT rectifying stage is used for absorbing the harmonic current at the alternating current side of the thyristor rectifying stage and converting the three-phase input current into direct current;
the output end of the IGBT inverter stage is respectively connected with the input end of the circulating current suppression circuit and the electrolytic cell, and the output end of the circulating current suppression circuit is connected with the control end of the IGBT inverter stage; the IGBT inverter stage is used for generating alternating current circulating current according to the direct current and transmitting the alternating current circulating current to the circulating current suppression circuit, and meanwhile, outputting high-frequency alternating current ripples to the electrolytic cell;
the circulation restraining circuit is used for generating a modulation signal by using alternating circulation and controlling the alternating circulation output by the IGBT inverter stage to be 0 according to the modulation signal.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a hydrogen production converter, which comprehensively considers the advantages of a non-fully-controlled device and a fully-controlled device of power electronics, adopts the topology of hybrid rectification of a transformer, a thyristor and an IGBT to realize low-voltage heavy current output, and realizes the circulation suppression of the hydrogen production converter through a circulation suppression circuit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a topological diagram of a hydrogen production converter provided by an embodiment of the invention;
FIG. 2 is an overall control block diagram of a hydrogen production converter provided in an embodiment of the present invention;
fig. 3 is a control block diagram of a circulating current suppression circuit according to an embodiment of the present invention;
fig. 4 is a specific control block diagram of the IGBT rectification control circuit provided in the embodiment of the present invention;
fig. 5 is a specific control block diagram of a thyristor rectification control circuit provided in an embodiment of the present invention;
fig. 6 is a simulation result diagram of the hydrogen production converter provided in the embodiment of the present invention; fig. 6 (a) is a net side a-phase current simulation diagram, fig. 6 (b) is a thyristor ac side current simulation diagram, and fig. 6 (c) is an IGBT ac side current simulation diagram;
FIG. 7 is a diagram showing simulation results of the input current of the electrolytic cell according to the embodiment of the present invention;
fig. 8 is a diagram of a simulation result of the magnitude of circulating current of an unapplied circulating current suppression circuit according to an embodiment of the present invention;
fig. 9 is a diagram of a simulation result of the magnitude of circulating current added with the circulating current suppression circuit according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a hydrogen production converter to realize circulation suppression of the hydrogen production converter.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
An embodiment of the present invention provides a hydrogen production converter, as shown in fig. 1, the hydrogen production converter includes: transformer, thyristor rectifier stage, IGBT inverter stage and circulation suppression circuit.
The primary coil of the transformer is connected with the power grid, and the secondary coil of the transformer is respectively connected with the input end of the thyristor rectification stage and the input end of the IGBT rectification stage. The output end of the thyristor rectification stage is connected with the electrolytic cell, and the thyristor rectification stage is used for generating current required by electrolysis of the electrolytic cell according to the three-phase input current and supplying power to the electrolytic cell. The output end of the IGBT rectifying stage is connected with the input end of the IGBT inverter stage, and the IGBT rectifying stage is used for absorbing the harmonic current at the alternating current side of the thyristor rectifying stage and converting the three-phase input current into direct current. The output end of the IGBT inverter stage is respectively connected with the input end of the circulating current suppression circuit and the electrolytic cell, and the output end of the circulating current suppression circuit is connected with the control end of the IGBT inverter stage; the IGBT inverter stage is used for generating alternating current circulating current according to the direct current and transmitting the alternating current circulating current to the circulating current suppression circuit, and meanwhile, outputting high-frequency alternating current ripples to the electrolytic cell. The circulating current suppression circuit is used for generating a modulation signal by using the alternating circulating current and controlling the alternating circulating current output by the IGBT inverter stage to be 0 according to the modulation signal.
Transformers are required because the hydrogen production system requires grounding of metal components to avoid the risk of electrical discharge and explosion, while grounding of live components requires that the power electronic conversion system must include an electrical isolation stage to isolate the hydrogen production system from the grid voltage. Considering that the characteristics of thyristor rectification are that the power factor of the input side is low while the characteristics of IGBT rectification are that the power factor of the input side is high while the capability of resisting large current is poor, and the current quality of the network side can be improved through active filtering, the advantages and the disadvantages of the thyristor rectification and the IGBT rectification are combined, so that the topology adopts a mode of thyristor rectification and IGBT parallel rectification, and the IGBT rectification and the inversion adopt a back-to-back connection mode.
The function of the transformer T1 is to electrically isolate the grid from the cell and to step down the voltage in order to rectify the power supplied to the cell. The function of the thyristor rectifier stage is to produce the low voltage, high current output required by the electrolyzer. The function of the IGBT rectifier stage is to absorb the ac side harmonic current rectified by the thyristor to approximate the grid side current to a sine and to maintain the dc side voltage. The function of the IGBT inverter stage is to realize the output of high-frequency alternating current ripples.
U in FIG. 1 a 、u b 、u c Is a three-phase AC supply voltage i a 、i b 、i c For three-phase input of the network sideStream, i sa 、i sb 、i sc Rectifying the three-phase input current on the AC side for thyristors, i va 、i vb 、i vc The three-phase input current on the alternating current side is rectified for the IGBT. i.e. i dc Rectifying the output current for the thyristor, i ac For the output current of the IGBT inverter stage, i out For the input current of the cell, V dc The dc side voltage of the IGBT rectifier stage. L is f AC side filter inductor, L, for IGBT rectifier stage 1 Output side filter inductance, L, for thyristor rectification 2 The filter inductor is the output side filter inductor of the IGBT inverter stage, and the direct current side voltage stabilizing capacitor is the direct current side voltage stabilizing capacitor of the IGBT rectifier stage.
The hydrogen production converter topology comprehensively considers the advantages of the power electronic non-fully-controlled device and the fully-controlled device, and adopts the topology of the transformer, the thyristor and the IGBT mixed rectification to realize low-voltage large-current output. Because the switching frequency of the thyristor is far lower than that of the IGBT, under the specific switching vector of PWM rectification and inversion, when the three-phase grid voltage is in a specific phase angle range, the voltage difference forming the circulating current can be generated, and the circulating current is generated. Therefore, a circulating current suppression circuit based on double half-bridge complementary current control is provided.
Referring to fig. 1, the igbt inverter stage includes: the inverter comprises a first half-bridge inverter circuit and a second half-bridge inverter circuit. The first half-bridge inverter circuit comprises a first switch tube (a switch tube V7) and a second switch tube (a switch tube V8); the second half-bridge inverter circuit comprises a third switch tube (a switch tube V9) and a fourth switch tube (a switch tube V10). The drain electrode of the first switching tube and the drain electrode of the third switching tube are both connected with the first output end of the IGBT rectification stage, the source electrode of the first switching tube is connected with the drain electrode of the second switching tube, the source electrode of the third switching tube is connected with the drain electrode of the fourth switching tube, and the drain electrode of the second switching tube and the drain electrode of the fourth switching tube are both connected with the second output end of the IGBT rectification stage; and a first common point at which the source electrode of the first switching tube is connected with the drain electrode of the second switching tube, and a second common point at which the source electrode of the third switching tube is connected with the drain electrode of the fourth switching tube are connected with the electrolytic cell. The first common point and the second common point are connected with the input end of the circulating current suppression circuit, and the grid electrode of the first switching tube, the grid electrode of the second switching tube, the grid electrode of the third switching tube and the grid electrode of the fourth switching tube are connected with the output end of the circulating current suppression circuit.
FIG. 2 is an overall control block diagram of a hydrogen production converter, wherein PLL is a phase-locked loop, theta is a power grid three-phase voltage synthesis vector angle, LPF is a low-pass filter, u is a phase-locked loop, and u is a phase-locked loop oa 、u ob 、u oc For the input side three-phase voltage u of the hydrogen production converter sa 、u sb 、u sc The input side three-phase voltage for thyristor rectification. i all right angle sd 、i sq Three-phase input current i rectified by thyristor sa 、i sb 、i sc D-axis and q-axis currents i after coordinate transformation vd 、i vq Three-phase input current i rectified for IGBT va 、i vb 、i vc D-and q-axis currents after coordinate transformation, v od 、v oq Three-phase input voltage u rectified by thyristor oa 、u ob 、u oc Voltages of d-axis and q-axis after coordinate transformation. i.e. i sdf 、i sqf Is i sd 、i sq Amount of current after passing through low pass filter, i sdh For harmonic components of thyristor d-axis input current, i c For controlling the output current value via a DC voltage i vd * 、i vq * D-axis and q-axis currents i rectified for IGBT, respectively vd 、i vq To the reference value of (c). V dc * Is a DC side voltage V dc Reference value of i ac * For the output current i of the IGBT inverter stage ac Reference value of i dc * Thyristor rectified output current i dc Of the reference value of (c). The AC side current control and the DC side voltage control obtain a required modulation wave signal through voltage and current double closed loop control, and the required PWM signal is generated through PWM modulation. The direct current side current control and the inversion side alternating current side current control are correspondingly controlled through a single current loop.
Fig. 3 is a control block diagram of the hydrogen production converter loop current suppression method, and VSI (voltage source inverter) is controlled as a constant current source. In the figure i ac For the output side current, i, of the IGBT inverter stage acdown For the output side current of the IGBT inverter stage, i carrier Is the carrier current. The circulation current of the hydrogen production converter is the sum of the current of the upper side and the current of the lower side output by the inverter:
i loop ＝i ac +i acdown
the aim of the circulating current suppression circuit is to reduce i loop The control is 0. In a general inverter control method, only the upper or lower current of the output side needs to be controlled, and thus only one modulation circuit is required. In the present topology, the upper and lower currents are different due to the presence of the loop current. Therefore, the conventional full-bridge control is disassembled into two half-bridges to independently control four IGBT switching tubes respectively, namely, one control switching tube V 7 And V 8 On/off of the other control switch tube V 9 And V 10 Is turned on and off. Two modulation circuits are used to control the current on the upper and lower sides, and then two half-bridges are supplied with current control signals with equal magnitude and opposite directions, i.e. the upper side is i ac * Lower side is-i ac * To drive the IGBT. Meanwhile, in order to reduce the control error of the upper and lower side currents, an inductor L which is the same as the upper side of the inverter output is added at the lower side of the inverter output 2 (first inductance and second inductance) in which circulating current suppression is performed.
The circulating current suppressing circuit includes: the circuit comprises a first inductor, a second inductor, a first difference module, a second difference module, a first PI regulator, a second PI regulator, a first modulation circuit and a second modulation circuit. One end of the first inductor is connected with the first common point, and the other end of the first inductor is connected with the first input end of the first difference making module; the second input end of the first difference making module inputs a current control signal i ac * The output end of the first difference making module is connected with the input end of the first PI regulator; the first differentiating module is used for converting the current control signal i ac * And the upper side current i output by the IGBT inverter stage ac The differentiated current is transmitted to the first PI regulator. The first input end of the first modulation circuit is connected with the output end of the first PI regulator, the second input end of the first modulation circuit inputs carrier current, and the two output ends of the first modulation circuit are respectively connected with the output end of the first PI regulatorThe grid electrode of the first switching tube is connected with the grid electrode of the second switching tube.
One end of the second inductor is connected with the second common point, and the other end of the second inductor is connected with the first input end of the second difference making module; the second input end of the second difference making module inputs a current control signal-i ac * The output end of the second difference making module is connected with the input end of the second PI regulator; the second differentiating module is used for converting the current control signal-i ac * And the lower side current i output by the IGBT inverter stage acdown The differentiated current is transmitted to the second PI regulator. The first input end of the second modulation circuit is connected with the output end of the second PI regulator, the second input end of the second modulation circuit inputs carrier current, and the two output ends of the second modulation circuit are respectively connected with the grid electrode of the third switch tube and the grid electrode of the fourth switch tube.
Referring to fig. 1, the hydrogen generation converter further includes: DC side voltage-stabilizing capacitor and inductor L 1 And three inductors L f . One end of the direct current side voltage-stabilizing capacitor is connected with the first output end of the IGBT rectifying stage, the drain electrode of the first switch tube and the drain electrode of the third switch tube respectively, and the other end of the direct current side voltage-stabilizing capacitor is connected with the second output end of the IGBT rectifying stage, the drain electrode of the second switch tube and the drain electrode of the fourth switch tube respectively. Inductor L 1 Is arranged on a connecting circuit of the thyristor rectification stage and the electrolytic cell. Three inductors L f The three-phase connecting lines of the transformer and the IGBT rectifying stage are respectively arranged in a one-to-one correspondence mode.
FIG. 4 is a detailed control block diagram of a VSC (voltage source converter) in a hydrogen-producing power supply, the VSC being controlled as a constant voltage source. Harmonic current i of SCR sdh And i sqh Is the total current i in the slave SCR sd And i sq Minus the DC component i of the total current sdf And i sqf Is obtained in which i sdf And i sqf Leading out by a low-pass filter:
i sdh ＝i sd -i sdf
i sqh ＝i sq -i sqf
d-axis reference current of VSC is represented by i sdh And i c Composition, q-axisReference current is given by sqh Composition i sdh And i sqh The ac side current of the VSC is regulated to compensate for the harmonic current of the SCR, which mainly includes 5 th, 7 th, 11 th, 13 th harmonics, etc. i all right angle c From the DC side voltage V dc And the difference is obtained between the reference voltage and the direct current side voltage, and then the difference is led out through a PI regulator to maintain the direct current side voltage stable.
Referring to fig. 2, the hydrogen generation converter further includes: IGBT rectification switching circuit and IGBT rectification control circuit. The input end of the IGBT rectification switching circuit is respectively connected with the secondary coil of the transformer, the input end of the thyristor rectification stage and the input end of the IGBT rectification stage. The first input end of the IGBT rectification control circuit is connected with the output end of the IGBT rectification switching circuit, the second input end of the IGBT rectification control circuit is connected with the direct-current side voltage-stabilizing capacitor, and the output end of the IGBT rectification control circuit is connected with the control end of the IGBT rectification stage.
Specifically, the IGBT rectification conversion circuit includes: the device comprises a phase-locked loop, an abc/dq conversion module, a first low-pass filter, a second low-pass filter, a third difference module and a fourth difference module. The input end of the phase-locked loop is connected with the secondary coil of the transformer. The input end of the abc/dq conversion module is connected with the output end of the phase-locked loop, the secondary coil of the transformer, the input end of the thyristor rectification stage and the input end of the IGBT rectification stage respectively, and the output end of the abc/dq conversion module is connected with the input end of the first low-pass filter, the input end of the second low-pass filter, the first input end of the third differencing module, the first input end of the fourth differencing module and the first input end of the IGBT rectification control circuit respectively. The abc/dq conversion module is used for converting three-phase input current i of a thyristor rectification stage sa 、i sb 、i sc Into d-axis current i sd And q-axis current i sq And applying the d-axis current i sd Respectively transmitted to a first low-pass filter and a third difference module to convert the q-axis current i sq And respectively transmitted to a second low-pass filter and a fourth difference module. The abc/dq conversion module is also used for converting the three-phase input voltage u of the thyristor rectification stage oa 、u ob 、u oc Converted to d-axis voltage v od And q-axis voltage v oq And the three-phase input of the IGBT rectifier stage is chargedStream i va 、i vb 、i vc Into d-axis current i vd And q-axis current i vq While simultaneously applying the d-axis voltage v od Q-axis voltage v oq D axis current i vd And q-axis current i vq All transmitted to the IGBT rectification control circuit.
The second input end of the third difference making module is connected with the output end of the first low-pass filter, and the output end of the third difference making module is connected with the third input end of the IGBT rectification control circuit; the third difference making module is used for making d-axis current i sd Making difference with the current quantity output by first low-pass filter to obtain harmonic component i of d-axis input current of thyristor rectification stage sdh And combine the harmonic component i sdh And transmitting the signal to an IGBT rectification control circuit. The second input end of the fourth difference making module is connected with the output end of the second low-pass filter, and the output end of the fourth difference making module is connected with the fourth input end of the IGBT rectification control circuit; the fourth differentiating module is used for differentiating the q-axis current i sq Making difference with the current quantity output by second low-pass filter to obtain harmonic component i of q-axis input current of thyristor rectification stage sqh And harmonic component i sqh And transmitting the signal to an IGBT rectification control circuit.
The IGBT rectification control circuit comprises: the device comprises a first summing module, an alternating current side current control module, a direct current side voltage control module, a dq/abc conversion module and a sine pulse width modulation module. The first input end of the direct current side voltage control module is connected with the direct current side voltage-stabilizing capacitor, the second input end of the direct current side voltage control module inputs a direct current side voltage reference value, and the output end of the direct current side voltage control module is connected with the first input end of the first summing module. The second input end of the first summing module is connected with the output end of the third difference making module, and the output end of the first summing module is connected with the first input end of the alternating current side current control module; the first summation module is used for outputting a current value i output by the direct current side voltage control module c And the harmonic component i sdh Adding to obtain a d-axis current reference value i of the IGBT rectifying stage vd * . The second input end of the AC side current control module is connected with the output end of the fourth difference making module, and the third input end of the AC side current control module is connected with the output end of the fourth difference making moduleThe input ends of the abc/dq conversion modules are connected; the alternating current side current control module is used for controlling a d-axis current reference value i according to the IGBT rectification stage vd * Harmonic component i sqh D-axis voltage v od Q-axis voltage v oq D axis current i vd And q-axis current i vq Generating d-axis voltage u d And q-axis voltage u q . The output end of the abc/dq conversion module is connected with the input end of the sinusoidal pulse width modulation module, and the abc/dq conversion module is used for converting the d-axis voltage u d And q-axis voltage u q Converted into three-phase voltages u a 、u b And u c . The output end of the sine pulse width modulation module is connected with the control end of the IGBT rectification stage, and the sine pulse width modulation module is used for controlling the three-phase voltage u a 、u b And u c And generating a modulation wave signal, and further controlling the IGBT rectification stage by using the modulation wave signal. Harmonic component i sqh I in FIG. 2 vq * 。
Wherein, exchange the side current control module and include: the device comprises a second summing module, a third PI regulator, a fourth PI regulator, a first decoupling module, a second decoupling module, a first operation module and a second operation module. The first input end of the second summing module is connected with the output end of the first summing module, the second input end of the second summing module is connected with the output end of the abc/dq conversion module, and the output end of the second summing module is connected with the input end of the third PI regulator; the output end of the third PI regulator is connected with the first input end of the first operation module. The first input end of the third summing module is connected with the output end of the fourth differencing module, the second input end of the third summing module is connected with the output end of the abc/dq conversion module, and the output end of the third summing module is connected with the input end of the fourth PI regulator; and the output end of the fourth PI regulator is connected with the first input end of the second operation module. The input end of the first decoupling module and the input end of the second decoupling module are both connected with the output end of the abc/dq conversion module, and the first decoupling module is used for acquiring d-axis current i output by the abc/dq conversion module vd And applying the d-axis current i vd Multiplying by omega L to obtain d-axis voltage; a second decoupling module for obtaining abc/dq-axis current i output by q-conversion module vq And applying the q-axis current i vq Multiplied by ω L to obtain the q-axis voltage. The second input end of the first operation module is connected with the output end of the abc/dq conversion module, and the third input end of the first operation module is connected with the output end of the second decoupling module; the first operation module is used for converting the d-axis voltage v output by the abc/dq conversion module od Subtracting the control voltage output by the third PI regulator and then subtracting the q-axis voltage output by the second decoupling module to obtain a d-axis voltage u d . A second input end of the second operation module is connected with an output end of the abc/dq conversion module, and a third input end of the second operation module is connected with an output end of the first decoupling module; the second operation module is used for converting the q-axis voltage v output by the abc/dq conversion module oq Adding the d-axis voltage output by the first decoupling module and then subtracting the control voltage output by the fourth PI regulator to obtain a q-axis voltage u q 。
The direct current side voltage control module comprises: a fifth difference module and a fifth PI regulator. The first input end of the fifth difference making module is connected with the direct current side voltage stabilizing capacitor, the second input end of the fifth difference making module inputs a direct current side voltage reference value, the output end of the fifth difference making module is connected with the input end of the fifth PI regulator, and the output end of the fifth PI regulator is connected with the first input end of the first summing module.
Fig. 5 is a specific control block diagram of an SCR (thyristor) in the hydrogen production power supply, and the SCR is controlled as a constant current source. Thyristor commutation needs to be controlled by a trigger pulse, V in the figure angle Is a firing angle value, V angle * Is composed of And a firing angle reference value, wherein alpha is a firing angle. The SCR actual current output value i dc And a large current reference value i required by a hydrogen production power supply dc * And comparing, performing error control through a PI regulator, calculating the trigger angle of the actual thyristor after the PI regulator and the reference trigger angle, and performing phase-shifting triggering by matching with a three-phase voltage synchronous signal to form low-voltage large-current output.
The thyristor rectification control circuit comprises a sixth difference module, a sixth PI regulator, an amplitude limiter, a seventh difference module and three-phase powerThe device comprises a voltage synchronization module and a three-phase-shifting trigger module. The input end of the three-phase voltage synchronization module is connected with the input end of the thyristor rectification stage, and the output end of the three-phase voltage synchronization module is connected with the first input end of the three-phase-shifting trigger module. The first input end of the sixth difference making module is connected with the output end of the thyristor rectification stage, and the second input end of the sixth difference making module inputs a current reference value i required by the hydrogen production power supply dc * The output end of the sixth difference making module is connected with the input end of the sixth PI regulator; the sixth differential module is used for outputting the actual current output value i of the SCR dc And a large current reference value i required by a hydrogen production power supply dc * Making a difference. The input end of the amplitude limiter is connected with the output end of the sixth PI regulator, the output end of the amplitude limiter is connected with the first input end of the seventh difference making module, and the second input end of the seventh difference making module inputs the trigger angle reference value V angle * The output end of the seventh difference making module is connected with the second input end of the three-phase-shifting trigger module; the seventh difference making module is used for making a difference according to the trigger angle value V output by the amplitude limiter angle And a firing angle reference value V angle * The firing angle alpha of the thyristor is obtained. The output end of the three-phase-shift trigger module is connected with the control end of the thyristor rectification stage.
The converter topology provided by the invention can effectively absorb harmonic waves on the alternating current side of the thyristor, improve the current quality of a power grid and generate low-voltage large-current input required by an electrolytic stack. And meanwhile, the circulation current is effectively restrained.
In fig. 6, the currents of the network side, the alternating current side of the thyristor and the alternating current side of the IGBT are shown from top to bottom, and it can be seen from the simulation result that the harmonic current of the alternating current side rectified by the thyristor is effectively absorbed, and the network side current is approximately sinusoidal. Figure 7 is the cell input current, from the simulation results it can be seen that a large current input of 1000A can be generated. Fig. 8 and 9 show the magnitude of the circulating current before and after the circulating current suppression method is added, respectively, and it can be seen from the simulation result that the circulating current suppression method provided by the present invention has a significant effect.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (10)

1. A hydrogen production converter, characterized in that it comprises: the circuit comprises a transformer, a thyristor rectifier stage, an IGBT inverter stage and a circulating current suppression circuit;
the primary coil of the transformer is connected with a power grid, and the secondary coil of the transformer is respectively connected with the input end of the thyristor rectification stage and the input end of the IGBT rectification stage;
the output end of the thyristor rectification stage is connected with the electrolytic cell, and the thyristor rectification stage is used for generating current required by electrolysis of the electrolytic cell according to the three-phase input current and supplying power to the electrolytic cell;
the output end of the IGBT rectifying stage is connected with the input end of the IGBT inverter stage, and the IGBT rectifying stage is used for absorbing the harmonic current at the alternating current side of the thyristor rectifying stage and converting the three-phase input current into direct current;
the output end of the IGBT inverter stage is respectively connected with the input end of the circulating current suppression circuit and the electrolytic cell, and the output end of the circulating current suppression circuit is connected with the control end of the IGBT inverter stage; the IGBT inverter stage is used for generating alternating current circulating current according to the direct current and transmitting the alternating current circulating current to the circulating current suppression circuit, and meanwhile, outputting high-frequency alternating current ripples to the electrolytic cell;
the circulation restraining circuit is used for generating a modulation signal by using alternating circulation and controlling the alternating circulation output by the IGBT inverter stage to be 0 according to the modulation signal.
2. The hydrogen-producing converter according to claim 1, wherein the IGBT inverter stage comprises: the first half-bridge inverter circuit and the second half-bridge inverter circuit;
the first half-bridge inverter circuit comprises a first switch tube and a second switch tube; the second half-bridge inverter circuit comprises a third switching tube and a fourth switching tube;
the drain electrode of the first switching tube and the drain electrode of the third switching tube are both connected with the first output end of the IGBT rectification stage, the source electrode of the first switching tube is connected with the drain electrode of the second switching tube, the source electrode of the third switching tube is connected with the drain electrode of the fourth switching tube, and the drain electrode of the second switching tube and the drain electrode of the fourth switching tube are both connected with the second output end of the IGBT rectification stage; a first common point at which the source electrode of the first switching tube is connected with the drain electrode of the second switching tube, and a second common point at which the source electrode of the third switching tube is connected with the drain electrode of the fourth switching tube are connected with the electrolytic cell;
the first common point and the second common point are connected with the input end of the circulating current suppression circuit, and the grid electrode of the first switching tube, the grid electrode of the second switching tube, the grid electrode of the third switching tube and the grid electrode of the fourth switching tube are connected with the output end of the circulating current suppression circuit.
3. The hydrogen producing converter of claim 2, wherein the circulating current suppression circuit comprises: the circuit comprises a first inductor, a second inductor, a first difference module, a second difference module, a first PI regulator, a second PI regulator, a first modulation circuit and a second modulation circuit;
one end of the first inductor is connected with the first common point, and the other end of the first inductor is connected with the first input end of the first difference making module; the second input end of the first difference module inputs a current control signal i ac * The output end of the first difference making module is connected with the input end of the first PI regulator; the first differential module is used for transmitting a current control signal i ac * And the upper side current i output by the IGBT inverter stage ac Transmitting the current after the difference to a first PI regulator;
a first input end of the first modulation circuit is connected with an output end of the first PI regulator, a second input end of the first modulation circuit inputs carrier current, and two output ends of the first modulation circuit are respectively connected with a grid electrode of the first switch tube and a grid electrode of the second switch tube;
one end of the second inductor is connected with the second common point, and the other end of the second inductor is connected with the first input end of the second difference making module; the second input end of the second difference making module inputs a current control signal-i ac * The output end of the second difference making module is connected with the input end of the second PI regulator; the second difference making module is used for making a current control signal-i ac * And the lower side current i output by the IGBT inverter stage acdown The current after the difference is transmitted to a second PI regulator;
the first input end of the second modulation circuit is connected with the output end of the second PI regulator, the second input end of the second modulation circuit inputs carrier current, and the two output ends of the second modulation circuit are respectively connected with the grid electrode of the third switching tube and the grid electrode of the fourth switching tube.
4. The hydrogen producing current transformer of claim 2, further comprising: DC side voltage-stabilizing capacitor and inductor L 1 And three inductors L f ；
One end of the direct current side voltage-stabilizing capacitor is respectively connected with the first output end of the IGBT rectifying stage, the drain electrode of the first switch tube and the drain electrode of the third switch tube, and the other end of the direct current side voltage-stabilizing capacitor is respectively connected with the second output end of the IGBT rectifying stage, the drain electrode of the second switch tube and the drain electrode of the fourth switch tube;
inductor L 1 The thyristor rectifier stage is arranged on a connecting circuit of the thyristor rectifier stage and the electrolytic cell;
three inductors L f The three-phase connecting lines are respectively arranged on the transformer and the IGBT rectifying stage in a one-to-one correspondence manner.
5. The hydrogen producing current transformer of claim 4, further comprising: the IGBT rectifying conversion circuit and the IGBT rectifying control circuit;
the input end of the IGBT rectification switching circuit is respectively connected with the secondary coil of the transformer, the input end of the thyristor rectification stage and the input end of the IGBT rectification stage;
the first input end of the IGBT rectification control circuit is connected with the output end of the IGBT rectification switching circuit, the second input end of the IGBT rectification control circuit is connected with the direct-current side voltage-stabilizing capacitor, and the output end of the IGBT rectification control circuit is connected with the control end of the IGBT rectification stage.
6. The hydrogen-producing converter according to claim 5, wherein the IGBT commutating conversion circuit comprises: the device comprises a phase-locked loop, an abc/dq conversion module, a first low-pass filter, a second low-pass filter, a third difference making module and a fourth difference making module;
the input end of the phase-locked loop is connected with a secondary coil of the transformer;
the input end of the abc/dq conversion module is respectively connected with the output end of the phase-locked loop, the secondary coil of the transformer, the input end of the thyristor rectification stage and the input end of the IGBT rectification stage, and the output end of the abc/dq conversion module is respectively connected with the input end of the first low-pass filter, the input end of the second low-pass filter, the first input end of the third difference making module, the first input end of the fourth difference making module and the first input end of the IGBT rectification control circuit;
the abc/dq conversion module is used for converting three-phase input current i of a thyristor rectification stage sa 、i sb 、i sc Into d-axis current i sd And q-axis current i sq And applying the d-axis current i sd Respectively transmitted to a first low-pass filter and a third difference module to obtain a q-axis current i sq Respectively transmitting the signals to a second low-pass filter and a fourth difference module;
the abc/dq conversion module is further used for rectifying three-phase input voltage u of a thyristor stage oa 、u ob 、u oc Converted to d-axis voltage v od And q-axis voltage v oq And three-phase input current i of IGBT rectification stage va 、i vb 、i vc Into d-axis current i vd And q-axis current i vq While simultaneously applying the d-axis voltage v od Q-axis voltage v oq D-axis current i vd And q-axis current i vq All transmitted to the IGBT rectification control circuit;
second input end and first input end of third difference moduleThe output end of the low-pass filter is connected, and the output end of the third difference making module is connected with the third input end of the IGBT rectification control circuit; the third difference making module is used for making d-axis current i sd Making difference with the current quantity output by first low-pass filter to obtain harmonic component i of d-axis input current of thyristor rectification stage sdh And combine the harmonic component i sdh Transmitting the signal to an IGBT rectification control circuit;
the second input end of the fourth difference making module is connected with the output end of the second low-pass filter, and the output end of the fourth difference making module is connected with the fourth input end of the IGBT rectification control circuit; the fourth difference making module is used for making q-axis current i sq Making difference with the current quantity output by second low-pass filter to obtain harmonic component i of q-axis input current of thyristor rectification stage sqh And harmonic component i sqh And transmitting the signal to the IGBT rectification control circuit.
7. The hydrogen producing converter of claim 5, wherein the IGBT commutation control circuit comprises: the device comprises a first summing module, an alternating current side current control module, a direct current side voltage control module, a dq/abc conversion module and a sine pulse width modulation module;
a first input end of the direct current side voltage control module is connected with the direct current side voltage-stabilizing capacitor, a second input end of the direct current side voltage control module inputs a direct current side voltage reference value, and an output end of the direct current side voltage control module is connected with a first input end of the first summing module;
the second input end of the first summing module is connected with the output end of the third difference making module, and the output end of the first summing module is connected with the first input end of the alternating current side current control module; the first summation module is used for outputting a current value i output by the direct current side voltage control module c And the harmonic component i sdh Adding to obtain a d-axis current reference value i of the IGBT rectifying stage vd * ；
The second input end of the alternating current side current control module is connected with the output end of the fourth difference making module, and the third input end of the alternating current side current control module is connected with the input end of the abc/dq conversion module; the alternating current side current control moduleBlock d-axis current reference i for rectification stage according to IGBT vd * Harmonic component i sqh D-axis voltage v od Q-axis voltage v oq D axis current i vd And q-axis current i vq Generating d-axis voltage u d And q-axis voltage u q ；
The output end of the abc/dq conversion module is connected with the input end of the sinusoidal pulse width modulation module, and the abc/dq conversion module is used for converting the d-axis voltage u d And q-axis voltage u q Converted to three-phase voltage u a 、u b And u c ；
The output end of the sine pulse width modulation module is connected with the control end of the IGBT rectification stage, and the sine pulse width modulation module is used for controlling the three-phase voltage u according to a 、u b And u c And generating a modulation wave signal, and further controlling the IGBT rectification stage by using the modulation wave signal.
8. The hydrogen producing converter of claim 7, wherein the ac side current control module comprises: the system comprises a first summing module, a second summing module, a third PI regulator, a fourth PI regulator, a first decoupling module, a second decoupling module, a first operation module and a second operation module;
the first input end of the second summing module is connected with the output end of the first summing module, the second input end of the second summing module is connected with the output end of the abc/dq conversion module, and the output end of the second summing module is connected with the input end of the third PI regulator; the output end of the third PI regulator is connected with the first input end of the first operation module;
the first input end of the third summing module is connected with the output end of the fourth differencing module, the second input end of the third summing module is connected with the output end of the abc/dq conversion module, and the output end of the third summing module is connected with the input end of the fourth PI regulator; the output end of the fourth PI regulator is connected with the first input end of the second operation module;
the input end of the first decoupling module and the input end of the second decoupling module are both connected with the output end of the abc/dq conversion module, and the first decoupling moduleFor obtaining d-axis current i output by abc/dq conversion module vd And applying the d-axis current i vd Multiplying by omega L to obtain d-axis voltage; the second decoupling module is used for acquiring a q-axis current i output by the abc/dq conversion module vq And applying the q-axis current i vq Multiplying by omega L to obtain a q-axis voltage;
the second input end of the first operation module is connected with the output end of the abc/dq conversion module, and the third input end of the first operation module is connected with the output end of the second decoupling module; the first operation module is used for converting the d-axis voltage v output by the abc/dq conversion module od Subtracting the control voltage output by the third PI regulator and then subtracting the q-axis voltage output by the second decoupling module to obtain a d-axis voltage u d ；
A second input end of the second operation module is connected with an output end of the abc/dq conversion module, and a third input end of the second operation module is connected with an output end of the first decoupling module; the second operation module is used for converting the q-axis voltage v output by the abc/dq conversion module oq Adding the d-axis voltage output by the first decoupling module and then subtracting the control voltage output by the fourth PI regulator to obtain a q-axis voltage u q 。
9. The hydrogen converter of claim 7, wherein the dc side voltage control module comprises: a fifth difference module and a fifth PI regulator;
the first input end of the fifth difference making module is connected with the direct current side voltage stabilizing capacitor, the second input end of the fifth difference making module inputs a direct current side voltage reference value, the output end of the fifth difference making module is connected with the input end of the fifth PI regulator, and the output end of the fifth PI regulator is connected with the first input end of the first summing module.
10. The hydrogen producing converter of claim 1 further comprising: a thyristor rectification control circuit;
the thyristor rectification control circuit comprises a sixth difference module, a sixth PI regulator, an amplitude limiter, a seventh difference module, a three-phase voltage synchronization module and a three-phase-shifting trigger module;
the input end of the three-phase voltage synchronization module is connected with the input end of the thyristor rectification stage, and the output end of the three-phase voltage synchronization module is connected with the first input end of the three-phase-shifting trigger module;
the first input end of the sixth difference making module is connected with the output end of the thyristor rectification stage, and the second input end of the sixth difference making module inputs a current reference value i required by the hydrogen production power supply dc * The output end of the sixth difference making module is connected with the input end of the sixth PI regulator; the sixth difference making module is used for making the actual current output value i of the SCR dc And a large current reference value i required by a hydrogen production power supply dc * Making a difference;
the input end of the amplitude limiter is connected with the output end of the sixth PI regulator, the output end of the amplitude limiter is connected with the first input end of the seventh difference making module, and the second input end of the seventh difference making module inputs a trigger angle reference value V angle * The output end of the seventh difference making module is connected with the second input end of the three-phase-shifting trigger module; the seventh difference making module is used for making a difference according to the trigger angle value V output by the amplitude limiter angle And a firing angle reference value V angle * Obtaining a trigger angle alpha of the thyristor;
the output end of the three-phase-shift trigger module is connected with the control end of the thyristor rectification stage.
CN202210988357.XA 2022-08-17 2022-08-17 Hydrogen production converter Pending CN115276433A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116247952A (en) * 2023-05-08 2023-06-09 国网山西省电力公司临汾供电公司 Three-phase bridge rectifier converter with controllable three bridge arm power

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116247952A (en) * 2023-05-08 2023-06-09 国网山西省电力公司临汾供电公司 Three-phase bridge rectifier converter with controllable three bridge arm power

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