CN111245263A - High-transformation-ratio wide-input-range power electronic conversion topology - Google Patents
High-transformation-ratio wide-input-range power electronic conversion topology Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention belongs to the technical field of power electronics, particularly relates to a high-transformation-ratio wide-input-range power electronic transformation topology, and aims to solve the problems that in the prior art, high-transformation-ratio wide-input-range power electronic transformation topology sub-modules are large in number, complex in structure and incapable of being directly connected with an electrolytic cell. The invention comprises the following steps: the three-phase uncontrolled rectifier bridge converts the alternating current electric energy converted from wind energy into a direct current power supply; the inductance module filters out residual alternating current electric energy in the direct current power supply; the sub-module group is used for carrying out voltage conversion to obtain a low-voltage direct-current power supply; the filter is used for filtering ripples of the low-voltage direct-current power supply, and the low-voltage instruction power supply after the ripples are filtered is directly connected with the electrolytic cell to perform off-grid hydrogen production. The invention realizes high transformation ratio voltage by combining three modes of direct current capacitor voltage division, isolated DC-DC high-frequency transformer transformation ratio and output parallel connection of the cascade subunit, has less modules and simple structure, meets the low ripple input requirement of the electrolytic cell, can be directly connected with the electrolytic cell, and has convenient system realization and stable and reliable performance.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a high-transformation-ratio wide-input-range power electronic transformation topology.
Background
The hydrogen energy is regarded as the clean energy with the most development potential in the 21 st century, and has been gradually popularized in the fields of industry, traffic, building heat supply and the like, the large-scale popularization of the hydrogen energy in a terminal application network in the future provides a new challenge for a large-scale green hydrogen production mode, the renewable energy hydrogen production is regarded as a main green hydrogen source in the future, and the utilization rate of renewable energy in China can be effectively improved, such as wind power hydrogen production, has important significance for solving the problems of local wind power consumption and development of a distributed wind power generation technology, realizing the multi-path high-efficiency utilization of the renewable energy, and is widely concerned at home and abroad, and the wind power hydrogen production technology mainly comprises the: (1) wind power integration, namely producing hydrogen from the part exceeding the power grid acceptance capacity; (2) wind power generation is the main part, and the power grid provides an auxiliary hydrogen production system; (3) a wind power hydrogen production-fuel cell micro-grid system; (4) an energy storage system for producing hydrogen based on wind power; (5) wind power is completely off-grid to produce hydrogen [1 ].
The off-grid hydrogen production technology avoids the problems of phase difference, frequency difference and the like caused by the fact that alternating current is connected to the grid, can greatly simplify a control system, delete auxiliary equipment required by grid connection, and adapt to a low-cost wind driven generator with an optimized structure, so that the cost is obviously reduced compared with a grid-connected hydrogen production system or a power grid for taking electricity and electrolyzing water to produce hydrogen. Because of the characteristics of low rated working voltage of the electrolytic cell, high requirement on current ripple indexes, high sensitivity to power fluctuation and the like, the requirements completely different from grid connection are provided for the electric energy conversion link of the whole system. With the rapid development of wind driven generators towards high power, the non-isolated DC/DC converter is restricted by the working voltage and working current range of devices, and is difficult to be applied to MW-level high-power application occasions. The comparison result of the document [2] shows that the isolated transformer is more suitable for the high-transformation-ratio application occasion of fan hydrogen production, but in order to ensure that the modularized isolated DC/DC works in the optimal working range, the voltage stability of the front end is generally required to be ensured. Therefore, the application field is generally connected with a stable direct current bus, or the input voltage is stabilized through a front DC/DC, AC/DC converter. For example, document [3] proposes a wind power hydrogen production topology scheme, which significantly reduces system cost by adopting an uncontrolled rectifier bridge, and increases the voltage/current control freedom by arranging a Buck circuit in front of an isolated DC/DC. But such circuits are also not applicable to high power applications.
The modular isolation type DC/DC series-parallel connection is a mature scheme in a high-voltage high-power occasion, wherein the input series-connection and output parallel type modular isolation type DC/DC has the advantages of expandability, high reliability, low current ripple and the like, and is particularly suitable for a high-power high-transformation-ratio voltage reduction occasion, a document [4] researches a voltage-sharing and current-sharing control strategy of the scheme, but the scheme also needs to be connected with a stable direct-current bus so as to enable the whole system to work in an optimal range, for example, a switch device of the isolation type DC/DC can continuously work in a soft switch mode, the frequency and the amplitude of the output voltage of a common permanent magnet synchronous fan change along with the wind speed, the direct-current voltage after uncontrolled rectification cannot be directly kept stable, and the type of DC/DC connection electrolytic cell cannot be directly adopted. Document [5] proposes an AC-DC converter in which the AC side is composed of cascaded subunits, and the DC side of each cascaded subunit is used as an independent input and outputs a parallel type, which provides a new idea for high-voltage AC to low-voltage DC conversion, but when this topology is applied to three-phase AC, there is a problem that the number of submodules will be increased by 3 times.
The following documents are background information related to the present invention:
[1] state of the art and development trend of wind power hydrogen production [ J ], chinese electro-mechanical engineering report, 2019, 34 (19): 4071-4083.
[2]Damien Guilbert,Stefania Maria Collura,Angel Scipioni.DC/DCconverter topologies for electrolyzers:State-of-the-art and remaining keyissues[J].International Journal of Hydrogen Energy,2017,42:23966-23985.
[3]Stefania Maria Collura,Damien Guilbert,Gianpaolo Vitale etal.Design and experimental validation of a high voltage ratio DC/DC converterfor proton exchange membrane electrolyzer applications[J].InternationalJournal of Hydrogen Energy,2019,44:7059-7072.
[4] Advanced yellow and Zhao juan, an improved interleaving control method based on an input-series output parallel phase-shifted full-bridge converter, research [ J ], report of electrotechnics and technology, 2019.
[5] Wumingzi, houniee, songsheng, jiang wei, independent input parallel output full bridge isolated DC-DC converter direct power balance control [ J ], report of chinese motor engineering, 2018, 38 (5): 1329-1337.
Disclosure of Invention
In order to solve the problems in the prior art, namely the problems that the number of high-transformation-ratio wide-input-range power electronic transformation topology submodules in the existing wind power off-grid hydrogen production system is large, the structure is complex, and the topological submodules cannot be directly connected with an electrolytic cell, the invention provides a high-transformation-ratio wide-input-range power electronic transformation topology which comprises a three-phase uncontrolled rectifier bridge, an inductance module, a submodule group and a filter;
the three-phase uncontrolled rectifier bridge is used for receiving alternating current electric energy obtained based on wind energy conversion and converting the alternating current electric energy into a direct current power supply;
the inductance module is used for isolating and filtering a direct-current power supply sent by the three-phase uncontrolled rectifier bridge and removing residual alternating-current electric energy in the direct-current power supply;
the sub-module group is used for receiving the isolated and filtered direct-current power supply sent by the inductance module and carrying out voltage conversion to obtain a low-voltage direct-current power supply;
the filter is used for receiving the low-voltage direct-current power supply sent by the submodule group, filtering out ripples and sending the ripples to the hydrogen production electrolytic cell module.
In some preferred embodiments, the alternating current input side of the three-phase uncontrolled rectifier bridge is connected with the output side of the fan, a positive direct current bus of the direct current output side is connected with one end of the inductor, and a negative direct current bus of the direct current output side is connected with the negative input end of the submodule group;
the other end of the inductor is connected with the positive input end of the sub-module group;
the positive output end of the sub-module group is connected with the positive input end of the filter, and the negative output end of the sub-module group is connected with the negative input end of the filter;
the positive output end of the filter is connected with the positive input end of the hydrogen production electrolytic cell module, and the negative output end of the filter is connected with the negative input end of the hydrogen production electrolytic cell module.
In some preferred embodiments, the set of submodules comprises n submodules;
the n sub-modules are connected in series at the input end; a first input end of a 1 st sub-module in the n sub-modules is used as a positive input end of the sub-module group, a second input end of the nth sub-module is used as a negative input end of the sub-module group, and the first input end of the nth sub-module is connected with a second input end of the (n-1) th sub-module;
the n sub-modules are connected in parallel at the output end; the first output end of each sub-module in the n sub-modules is connected together to be used as the positive output end of the sub-module group, and the second output end of each sub-module in the n sub-modules is connected together to be used as the negative output end of the sub-module group.
In some preferred embodiments, the sub-modules comprise half-bridge sub-units, isolated DC-DC;
the first input end of the half-bridge subunit is used as the first input end of the submodule, the second input end of the half-bridge subunit is used as the second input end of the submodule, the first output end of the half-bridge subunit is connected with the anode of the isolation DC-DC input side, and the second output end of the half-bridge subunit is connected with the cathode of the isolation DC-DC input side;
and the anode of the isolated DC-DC output side is used as a first output end of the submodule, and the cathode of the isolated DC-DC output side is used as a second output end of the submodule.
In some preferred embodiments, the half-bridge subunit comprises a first capacitor, a second capacitor, a diode, and a fully-controlled device;
the anode of the first capacitor is connected with the cathode of the diode and is used as the anode of the half-bridge subunit direct current bus, and the cathode of the first capacitor is connected with the anode of the second capacitor;
the cathode of the second capacitor is connected with the emitter of the full-control device and is used as a second input end of the half-bridge subunit and a cathode of the direct-current bus of the half-bridge subunit;
and the collector of the full-control device is connected with the anode of the diode and used as a first input end of the half-bridge subunit.
In some preferred embodiments, the isolated DC-DC includes an inverting structure, a transformer, an uncontrolled rectifier bridge;
the first output end of the inversion structure is connected with the positive electrode of the input side of the transformer, and the second output end of the inversion structure is connected with the negative electrode of the input side of the transformer;
the positive pole of the output side of the transformer is connected with the first input end of the uncontrolled rectifier bridge, and the negative pole of the output side of the transformer is connected with the second input end of the uncontrolled rectifier bridge;
the positive pole and the negative pole of the direct current side of the inversion structure are used as two input ends of the isolated DC-DC, and the positive pole and the negative pole of the direct current side of the uncontrolled rectifier bridge are used as two output ends of the isolated DC-DC.
On the other hand, the invention provides a wind power off-grid hydrogen production system, which is based on the high-transformation-ratio wide-input-range power electronic transformation topology and comprises a permanent magnet fan, a high-transformation-ratio wide-input-range power electronic transformation topology and a hydrogen production electrolytic tank module;
the permanent magnet fan is used for converting wind energy into alternating current energy and sending the alternating current energy to the high-transformation-ratio wide-input-range power electronic transformation topology;
the high-transformation-ratio wide-input-range power electronic conversion topology is used for obtaining a low-voltage direct-current power supply with filtered ripples based on the alternating-current electric energy and sending the low-voltage direct-current power supply to the hydrogen production electrolytic cell module;
the hydrogen production electrolytic tank module is used for receiving the low-voltage direct-current power supply after the ripple waves are filtered out, and performing wind power off-grid hydrogen production.
In some preferred embodiments, the permanent magnet fan is a permanent magnet synchronous fan.
The invention has the beneficial effects that:
(1) the high-transformation-ratio wide-input-range power electronic conversion topology realizes high transformation-ratio voltage by combining three modes of direct-current capacitor voltage division of the cascade subunit, transformation ratio of the isolated DC-DC high-frequency transformer and output parallel connection, can realize low ripple effect of inductive current by adopting staggered control on a plurality of isolated DC-DC and adopting an output ripple cancellation method, has few modules and simple structure, meets the low ripple input requirement of an electrolytic cell, and can be directly connected with the electrolytic cell.
(2) The invention has high transformation ratio and wide input range, has less total control devices, reduces the system cost, adopts a modular structure, is convenient to realize redundant configuration and improves the system reliability, and simultaneously, the topology adopts low-voltage conventional parts, has simple and convenient topology structure and high reliability, and is convenient to realize.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of the high transformation ratio wide input range power electronic conversion topology of the present invention;
FIG. 2 is a schematic diagram of the sub-module configuration of an embodiment of the high transformation ratio wide input range power electronic conversion topology of the present invention;
FIG. 3 is a schematic diagram of a sub-module structure of an embodiment of a high transformation ratio wide input range power electronic conversion topology of the present invention;
fig. 4 is a schematic diagram of a half-bridge subunit and isolated DC-DC structure of an embodiment of the high transformation ratio wide input range power electronic conversion topology of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The invention discloses a high-transformation-ratio wide-input-range power electronic conversion topology, which comprises a three-phase uncontrolled rectifier bridge, an inductance module, a submodule group and a filter;
the three-phase uncontrolled rectifier bridge is used for receiving alternating current electric energy obtained based on wind energy conversion and converting the alternating current electric energy into a direct current power supply;
the inductance module is used for isolating and filtering a direct-current power supply sent by the three-phase uncontrolled rectifier bridge and removing residual alternating-current electric energy in the direct-current power supply;
the sub-module group is used for receiving the isolated and filtered direct-current power supply sent by the inductance module and carrying out voltage conversion to obtain a low-voltage direct-current power supply;
the filter is used for receiving the low-voltage direct-current power supply sent by the submodule group, filtering out ripples and sending the ripples to the hydrogen production electrolytic cell module.
In order to more clearly describe the high transformation ratio wide input range power electronic conversion topology of the present invention, details of each module in the embodiment of the present invention are described below with reference to fig. 1.
The invention discloses a high-transformation-ratio wide-input-range power electronic conversion topology which comprises a three-phase uncontrolled rectifier bridge, an inductance module, a submodule group and a filter, wherein the modules are described in detail as follows:
the three-phase uncontrolled rectifier bridge is used for receiving alternating current electric energy obtained based on wind energy conversion and converting the alternating current electric energy into a direct current power supply. The alternating current input side of the three-phase uncontrolled rectifier bridge is connected with the output side of the fan, a positive direct current bus of the direct current output side is connected with one end of the inductor, and a negative direct current bus of the direct current output side is connected with the negative input end of the submodule group.
The uncontrolled rectifier bridge only needs a plurality of thyristors and trigger circuits, does not need wide pulse or double pulse triggering, has simple and economical lines, convenient adjustment and uncontrollable output voltage, is determined only by the voltage of a power grid, and is mainly used in power devices with medium capacity or without reversible dragging.
The inductance module is used for isolating and filtering the direct-current power supply sent by the three-phase uncontrolled rectifier bridge and removing residual alternating-current electric energy in the direct-current power supply. One end of the inductor is connected with a positive direct current bus at the direct current output side of the three-phase uncontrolled rectifier bridge, and the other end of the inductor is connected with the positive input end of the sub-module group.
The sub-module group is used for receiving the isolated and filtered direct-current power supply sent by the inductance module and carrying out voltage conversion to obtain a low-voltage direct-current power supply. The positive output end of the sub-module group is connected with the positive input end of the filter, the negative output end of the sub-module group is connected with the negative input end of the filter, the positive input end of the sub-module group is connected with the inductor, and the negative input end of the sub-module group is connected with the negative direct current bus at the direct current output side of the three-phase uncontrolled rectifier bridge.
The filter is used for receiving the low-voltage direct-current power supply sent by the sub-module group, filtering out ripples and sending the ripples to the hydrogen production electrolytic cell module. The positive output end of the filter is connected with the positive input end of the hydrogen production electrolytic cell module, and the negative output end of the filter is connected with the negative input end of the hydrogen production electrolytic cell module.
The output side of the fan 6 is connected with the alternating current input side of the three-phase uncontrolled rectifier bridge 1, a positive direct current bus 11 of the direct current output side of the three-phase uncontrolled rectifier bridge is connected with one side 13 of an inductor, the other side 14 of the inductor is connected with a first input end 15 of the submodule group, and a negative direct current bus 12 of the direct current output side of the three-phase uncontrolled rectifier bridge is connected with a second input end 16 of the submodule group. The first output end 17 of the sub-module group is connected with the first input end 19 of the filter, the second output end 18 of the sub-module group is connected with the second input end 20 of the filter, the first output end 21 of the filter is connected with the first input end 23 of the hydrogen-making electrolytic cell module, and the second output end 22 of the filter is connected with the second input end 24 of the hydrogen-making electrolytic cell module.
The submodule group comprises n submodules;
the n sub-modules are connected in series at the input end; the first input end of the 1 st sub-module in the n sub-modules is used as the positive input end of the sub-module group, the second input end of the nth sub-module is used as the negative input end of the sub-module group, and the first input end of the nth sub-module is connected with the second input end of the (n-1) th sub-module;
the n sub-modules are connected in parallel at the output end; the first output end of each sub-module in the n sub-modules is connected together to be used as the positive output end of the sub-module group, and the second output end of each sub-module in the n sub-modules is connected together to be used as the negative output end of the sub-module group.
As shown in fig. 2, a schematic diagram of a sub-module group configuration according to an embodiment of the power electronic conversion topology with high transformation ratio and wide input range of the present invention includes n sub-modules: the first input 21 of the submodule 1 is used as the first input of the submodule group, the second input 22 of the submodule 1 is connected to the first input 23 of the submodule 2, and so on, the second input 25 of the submodule n-1 is connected to the first input 26 of the submodule n, and the second input 27 of the submodule n is used as the second input of the submodule group. The first output ends of the submodules 1 to n are connected together to serve as the first output end of the submodule group, and the second output ends of the submodules 1 to n are connected together to serve as the second output end of the submodule group.
The sub-module comprises a half-bridge sub-unit and an isolation DC-DC;
the first input end of the half-bridge subunit is used as the first input end of the submodule, the second input end of the half-bridge subunit is used as the second input end of the submodule, the first output end of the half-bridge subunit is connected with the anode of the isolation DC-DC input side, and the second output end of the half-bridge subunit is connected with the cathode of the isolation DC-DC input side;
and the anode of the isolated DC-DC output side is used as a first output end of the submodule, and the cathode of the isolated DC-DC output side is used as a second output end of the submodule.
As shown in fig. 3, a schematic view of a sub-module structure of an embodiment of a high transformation ratio wide input range power electronic conversion topology of the present invention includes a half-bridge sub-unit, an isolated DC-DC: the first input terminal 41 of the half-bridge subunit serves as a submodule first input terminal, and the second input terminal 42 of the half-bridge subunit serves as a submodule second input terminal; a positive direct-current bus (first output end) 43 of the half-bridge subunit is connected with an isolated DC-DC input side positive electrode 45, and a negative direct-current bus (second output end) 44 of the half-bridge subunit is connected with an isolated DC-DC input side negative electrode 46; the isolated DC-DC output side positive pole 47 serves as a first output terminal of the submodule, and the isolated DC-DC output side negative pole 48 serves as a second output terminal of the submodule.
The half-bridge subunit comprises a first capacitor, a second capacitor, a diode and a full-control device;
the anode of the first capacitor is connected with the cathode of the diode and used as the anode of a direct current bus of the half-bridge subunit, and the cathode of the first capacitor is connected with the anode of the second capacitor;
the cathode of the second capacitor is connected with the emitter of the full-control device and used as a second input end of the half-bridge subunit and the cathode of the direct-current bus of the half-bridge subunit;
and the collector of the full-control device is connected with the anode of the diode and used as a first input end of the half-bridge subunit.
The isolated DC-DC comprises an inversion structure, a transformer and an uncontrolled rectifier bridge;
the first output end of the inversion structure is connected with the positive electrode of the input side of the transformer, and the second output end of the inversion structure is connected with the negative electrode of the input side of the transformer;
the positive pole of the output side of the transformer is connected with the first input end of the uncontrolled rectifier bridge, and the negative pole of the output side of the transformer is connected with the second input end of the uncontrolled rectifier bridge;
the positive pole and the negative pole of the direct current side of the inversion structure are used as two input ends of the isolated DC-DC, and the positive pole and the negative pole of the direct current side of the uncontrolled rectifier bridge are used as two output ends of the isolated DC-DC.
The half-bridge sub-unit and the isolated DC-DC may be formed in various forms, as shown in fig. 4, which is a schematic structural diagram of the half-bridge sub-unit and the isolated DC-DC according to an embodiment of the power electronic conversion topology with a high transformation ratio and a wide input range of the present invention. The half-bridge subunit includes: the half-bridge subunit direct current control circuit comprises a first capacitor 51, a second capacitor 52, a diode 53 and a full-control device 54, wherein the anode of the first capacitor is connected with the cathode of the diode and serves as the anode of a half-bridge subunit direct current bus, the cathode of the first capacitor is connected with the anode of the second capacitor, the cathode of the second capacitor is connected with the emitter of the full-control device and serves as the second input end of the half-bridge subunit, the cathode of the half-bridge subunit direct current bus is formed by connecting the cathode of the second capacitor with the emitter of the full-control device, and the collector of the full-control device is connected with the anode. The isolated DC-DC includes: the direct current side anode and cathode of the inversion structure are used as two input ends for isolating the DC-DC, the alternating current side of the inversion structure is connected with the input end of the transformer, the output end of the transformer is connected with the alternating current side of the single-phase uncontrolled rectifier bridge, and the direct current side anode and cathode of the single-phase uncontrolled rectifier bridge are used as the output end for isolating the DC-DC.
It should be noted that, the power electronic conversion topology with high transformation ratio and wide input range provided by the above embodiment is only illustrated by the division of the above functional modules, and in practical applications, the above functions may be distributed by different functional modules according to needs, that is, the modules in the embodiment of the present invention are further decomposed or combined, for example, the modules in the above embodiment may be combined into one module, or may be further split into multiple sub-modules, so as to complete all or part of the above described functions. The names of the modules involved in the embodiments of the present invention are only for distinguishing the modules, and are not to be construed as an improper limitation of the present invention.
The wind power off-grid hydrogen production system of the second embodiment of the invention is based on the high transformation ratio wide input range power electronic transformation topology, and comprises a permanent magnet fan, a high transformation ratio wide input range power electronic transformation topology and a hydrogen production electrolytic cell module;
the permanent magnet fan is used for converting wind energy into alternating current energy and sending the alternating current energy to a high-transformation-ratio wide-input-range power electronic conversion topology; wherein, the permanent magnet fan is a permanent magnet synchronous fan.
The high-transformation-ratio wide-input-range power electronic conversion topology is used for acquiring a direct-current power supply with set frequency based on alternating-current electric energy and sending the direct-current power supply to the hydrogen production electrolytic cell module;
the hydrogen production electrolytic tank module is used for receiving a direct current power supply with set frequency and performing wind power off-grid hydrogen production.
The off-grid hydrogen production by wind power is a completely different technical path from the grid connection of wind power or partial grid connection of partial hydrogen production, and the produced hydrogen can be supplied to different fields of industry, traffic, and the like. The off-grid hydrogen production technology avoids the problems of phase difference, frequency difference and the like caused by the fact that alternating current is connected to the grid, so that the control system can be greatly simplified, auxiliary equipment required by grid connection can be omitted, the low-cost wind driven generator with the optimized structure can be adapted, and the cost is obviously reduced compared with a grid-connected hydrogen production system or a power grid for taking electricity, electrolyzing water and producing hydrogen.
The terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing or implying a particular order or sequence.
The terms "comprises," "comprising," or any other similar term 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.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (8)
1. A high-transformation-ratio wide-input-range power electronic conversion topology is characterized by comprising a three-phase uncontrolled rectifier bridge, an inductance module, a submodule group and a filter;
the three-phase uncontrolled rectifier bridge is used for receiving alternating current electric energy obtained based on wind energy conversion and converting the alternating current electric energy into a direct current power supply;
the inductance module is used for isolating and filtering a direct-current power supply sent by the three-phase uncontrolled rectifier bridge and removing residual alternating-current electric energy in the direct-current power supply;
the sub-module group is used for receiving the isolated and filtered direct-current power supply sent by the inductance module and carrying out voltage conversion to obtain a low-voltage direct-current power supply;
the filter is used for receiving the low-voltage direct-current power supply sent by the submodule group, filtering out ripples and sending the ripples to the hydrogen production electrolytic cell module.
2. The high-transformation-ratio wide-input-range power electronic conversion topology of claim 1, wherein an alternating current input side of the three-phase uncontrolled rectifier bridge is connected with an output side of a fan, a positive direct current bus of a direct current output side is connected with one end of the inductor, and a negative direct current bus of the direct current output side is connected with a negative input end of the submodule group;
the other end of the inductor is connected with the positive input end of the sub-module group;
the positive output end of the sub-module group is connected with the positive input end of the filter, and the negative output end of the sub-module group is connected with the negative input end of the filter;
the positive output end of the filter is connected with the positive input end of the hydrogen production electrolytic cell module, and the negative output end of the filter is connected with the negative input end of the hydrogen production electrolytic cell module.
3. A high-ratio wide-input-range power electronic conversion topology according to claim 1 or 2, wherein the sub-module group comprises n sub-modules;
the n sub-modules are connected in series at the input end; a first input end of a 1 st sub-module in the n sub-modules is used as a positive input end of the sub-module group, a second input end of the nth sub-module is used as a negative input end of the sub-module group, and the first input end of the nth sub-module is connected with a second input end of the (n-1) th sub-module;
the n sub-modules are connected in parallel at the output end; the first output end of each sub-module in the n sub-modules is connected together to be used as the positive output end of the sub-module group, and the second output end of each sub-module in the n sub-modules is connected together to be used as the negative output end of the sub-module group.
4. A high transformation ratio wide input range power electronic conversion topology according to claim 3, wherein said sub-modules comprise half-bridge sub-units, isolated DC-DC;
the first input end of the half-bridge subunit is used as the first input end of the submodule, the second input end of the half-bridge subunit is used as the second input end of the submodule, the first output end of the half-bridge subunit is connected with the anode of the isolation DC-DC input side, and the second output end of the half-bridge subunit is connected with the cathode of the isolation DC-DC input side;
and the anode of the isolated DC-DC output side is used as a first output end of the submodule, and the cathode of the isolated DC-DC output side is used as a second output end of the submodule.
5. The high-transformation-ratio wide-input-range power electronic conversion topology according to claim 4, wherein the half-bridge sub-unit comprises a first capacitor, a second capacitor, a diode, and a fully-controlled device;
the anode of the first capacitor is connected with the cathode of the diode and is used as the anode of the half-bridge subunit direct current bus, and the cathode of the first capacitor is connected with the anode of the second capacitor;
the cathode of the second capacitor is connected with the emitter of the full-control device and is used as a second input end of the half-bridge subunit and a cathode of the direct-current bus of the half-bridge subunit;
and the collector of the full-control device is connected with the anode of the diode and used as a first input end of the half-bridge subunit.
6. The high transformation ratio wide input range power electronic conversion topology of claim 4, wherein the isolated DC-DC comprises an inverting structure, a transformer, an uncontrolled rectifier bridge;
the first output end of the inversion structure is connected with the positive electrode of the input side of the transformer, and the second output end of the inversion structure is connected with the negative electrode of the input side of the transformer;
the positive pole of the output side of the transformer is connected with the first input end of the uncontrolled rectifier bridge, and the negative pole of the output side of the transformer is connected with the second input end of the uncontrolled rectifier bridge;
the positive pole and the negative pole of the direct current side of the inversion structure are used as two input ends of the isolated DC-DC, and the positive pole and the negative pole of the direct current side of the uncontrolled rectifier bridge are used as two output ends of the isolated DC-DC.
7. A wind power off-grid hydrogen production system is characterized in that based on the high-transformation-ratio wide-input-range power electronic transformation topology of any one of claims 1-6, the system comprises a permanent magnet fan, a high-transformation-ratio wide-input-range power electronic transformation topology and a hydrogen production electrolytic cell module;
the permanent magnet fan is used for converting wind energy into alternating current energy and sending the alternating current energy to the high-transformation-ratio wide-input-range power electronic transformation topology;
the high-transformation-ratio wide-input-range power electronic conversion topology is used for obtaining a low-voltage direct-current power supply with filtered ripples based on the alternating-current electric energy and sending the low-voltage direct-current power supply to the hydrogen production electrolytic cell module;
the hydrogen production electrolytic tank module is used for receiving the low-voltage direct-current power supply after the ripple waves are filtered out, and performing wind power off-grid hydrogen production.
8. The wind-powered off-grid hydrogen production system according to claim 7, wherein the permanent magnet fan is a permanent magnet synchronous fan.
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