CN114123304A - Four-input single-output direct current series-parallel connection grid-connected switching system for wind power generation - Google Patents

Four-input single-output direct current series-parallel connection grid-connected switching system for wind power generation Download PDF

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CN114123304A
CN114123304A CN202111250375.XA CN202111250375A CN114123304A CN 114123304 A CN114123304 A CN 114123304A CN 202111250375 A CN202111250375 A CN 202111250375A CN 114123304 A CN114123304 A CN 114123304A
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mechanical switch
output
rectifier
input
series
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CN114123304B (en
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秦猛
郭小江
孙财新
付明志
李铮
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Huaneng Clean Energy Research Institute
Huaneng Offshore Wind Power Science and Technology Research Co Ltd
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Huaneng Clean Energy Research Institute
Huaneng Offshore Wind Power Science and Technology Research Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The application provides a four-input single-output direct current series-parallel connection grid-connected switching system for wind power generation, which comprises: the wind wheel is connected with a motor corresponding to the wind wheel, the wind turbine generator is connected with the input end of the converter, series-parallel connection switching can be achieved inside the converter through a mechanical switch, and the output end of the converter is connected with the grid-connected transformer. According to different working states of the change-over switch, the system can work in a direct current side series mode and a direct current side parallel mode, the direct current bus voltage grade of a system current conversion system can be improved, or the output power of the system is increased by collecting current on the basis that the direct current side voltage of the current conversion system is not changed, four network side inverters are reduced into one, the weight and the cost of equipment are reduced, the line loss of the system is reduced, the control complexity of the system is reduced, and the grid-connected power generation efficiency of the system is improved.

Description

Four-input single-output direct current series-parallel connection grid-connected switching system for wind power generation
Technical Field
The application relates to the technical field of wind power generation, in particular to a four-input single-output direct current series-parallel grid-connected switching system for wind power generation.
Background
In recent years, the annual growth rate of the global renewable energy utilization reaches 25%, the renewable energy utilization is dominated by the power industry, and the power generation proportion of non-hydraulic renewable energy is doubled. Wind power generation is used as renewable energy power generation with the most mature technology except hydroelectric power generation, the installed capacity of the wind power generation accounts for the vast majority of the installed total capacity of the whole renewable energy power generation, but the limit of the performance of power electronic devices causes certain bottleneck to the research and application of large-capacity wind turbine generators, and how to reasonably construct a grid-connected system becomes a problem to be solved in the industry urgently.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present application is to provide a four-input single-output dc series-parallel grid-connected switching system for wind power generation, so as to improve the output power of the system, reduce the weight and cost of the equipment, reduce the line loss of the system, reduce the complexity of system control, and improve the grid-connected power generation efficiency of the system.
In order to achieve the above object, an embodiment of the present application provides a four-input single-output dc series-parallel grid-connected switching system for wind power generation, including: the wind power generation system comprises a wind power generation set, a five-input-port converter and a grid-connected transformer, wherein the wind power generation set comprises a wind wheel and a motor corresponding to the wind wheel, and the five-input-port converter comprises a first rectifier, a second rectifier, a third rectifier, a fourth rectifier, an inverter and a mechanical switch; the wind wheel is connected with the motor corresponding to the wind wheel, the first output end of the wind turbine generator is connected with the input end of the first rectifier, the second output end of the wind turbine generator is connected with the input end of the second rectifier, the third output end of the wind turbine generator is connected with the input end of the third rectifier, the fourth output end of the wind turbine generator is connected with the input end of the fourth rectifier, the output positive end of the first rectifier is connected with the input positive end of the inverter, the output negative end of the first rectifier is connected with the first free end of the mechanical switch, the first parallel fixed end of the mechanical switch is connected with the input negative end of the inverter, the output positive end of the second rectifier is connected with the second free end of the mechanical switch, and the second parallel fixed end of the mechanical switch is connected with the input positive end of the inverter, the first series fixed end of the mechanical switch is connected with the second series fixed end of the mechanical switch, the output negative end of the second rectifier is connected with the third free end of the mechanical switch, the third parallel fixed end of the mechanical switch is connected with the input negative end of the inverter, the output positive end of the third rectifier is connected with the fourth free end of the mechanical switch, the fourth parallel fixed end of the mechanical switch is connected with the input positive end of the inverter, the third series fixed end of the mechanical switch is connected with the fourth series fixed end of the mechanical switch, the output negative end of the third rectifier is connected with the fifth free end of the mechanical switch, the fifth parallel fixed end of the mechanical switch is connected with the input negative end of the inverter, the output positive end of the fourth rectifier is connected with the sixth free end of the mechanical switch, mechanical switch's the parallelly connected stiff end of sixth with the input positive end of dc-to-ac converter is connected, mechanical switch's the fifth series connection stiff end with mechanical switch's the serially connected stiff end of sixth is connected, the output negative end of fourth rectifier with the input negative end of dc-to-ac converter is connected, the output of dc-to-ac converter with the transformer that is incorporated into the power networks is connected, mechanical switch's first free end switching connection mechanical switch's the parallelly connected stiff end of first parallel with mechanical switch's the serially connected stiff end of first series, mechanical switch's the second free end switching connection mechanical switch's the parallelly connected stiff end of second with mechanical switch's the serially connected stiff end of second, mechanical switch's the third free end switching connection mechanical switch's the parallelly connected stiff end of third with mechanical switch's the serially connected stiff end of third, mechanical switch's fourth is from the end switching connection mechanical switch's the parallelly connected stiff end of fourth parallel with mechanical switch's the serially connected stiff end of fourth And the fifth free end of the mechanical switch is connected in a switching manner with the fifth parallel fixed end of the mechanical switch and the fifth serial fixed end of the mechanical switch, and the sixth free end of the mechanical switch is connected in a switching manner with the sixth parallel fixed end of the mechanical switch and the sixth serial fixed end of the mechanical switch.
The embodiment of the application provides a four-input single-output direct current series-parallel connection switching system for wind power generation, a wind wheel is connected with a motor corresponding to the wind wheel, a first output end of a wind turbine generator is connected with an input end of a first rectifier, a second output end of the wind turbine generator is connected with an input end of a second rectifier, a third output end of the wind turbine generator is connected with an input end of a third rectifier, a fourth output end of the wind turbine generator is connected with an input end of a fourth rectifier, an output positive end of the first rectifier is connected with an input positive end of an inverter, an output negative end of the first rectifier is connected with a first free end of a mechanical switch, a first parallel connection fixed end of the mechanical switch is connected with an input negative end of the inverter, an output positive end of the second rectifier is connected with a second free end of the mechanical switch, a second parallel connection fixed end of the mechanical switch is connected with an input positive end of the inverter, and a first series connection fixed end of the mechanical switch is connected with a second series connection fixed end of the mechanical switch, the output negative end of the second rectifier is connected with the third free end of the mechanical switch, the third parallel fixed end of the mechanical switch is connected with the input negative end of the inverter, the output positive end of the third rectifier is connected with the fourth free end of the mechanical switch, the fourth parallel fixed end of the mechanical switch is connected with the input positive end of the inverter, the third series fixed end of the mechanical switch is connected with the fourth series fixed end of the mechanical switch, the output negative end of the third rectifier is connected with the fifth free end of the mechanical switch, the fifth parallel fixed end of the mechanical switch is connected with the input negative end of the inverter, the output positive end of the fourth rectifier is connected with the sixth free end of the mechanical switch, the sixth parallel fixed end of the mechanical switch is connected with the input positive end of the inverter, the fifth series fixed end of the mechanical switch is connected with the sixth series fixed end of the mechanical switch, the output negative end of the fourth rectifier is connected with the input negative end of the inverter, the output end of the inverter is connected with the grid-connected transformer, the first parallel fixed end of the mechanical switch and the first series fixed end of the mechanical switch are connected through the first free end of the mechanical switch in a switching mode, the second parallel fixed end of the mechanical switch and the second series fixed end of the mechanical switch are connected through the second free end of the mechanical switch in a switching mode, the third parallel fixed end of the mechanical switch and the third series fixed end of the mechanical switch are connected through the third free end of the mechanical switch in a switching mode, the fourth parallel fixed end of the mechanical switch and the fourth series fixed end of the mechanical switch are connected through the end of the mechanical switch in a switching mode, the fifth parallel fixed end of the mechanical switch and the fifth series fixed end of the mechanical switch are connected through the fifth free end of the mechanical switch in a switching mode, and the sixth parallel fixed end of the mechanical switch and the sixth series fixed end of the mechanical switch are connected through the sixth free end of the mechanical switch in a switching mode. The four-input single-output direct current series-parallel connection grid-connected switching system for wind power generation comprises six sets of mechanical selection switches, different functions of series connection boosting and parallel connection converging of the direct current side of the grid-connected system are achieved through the action of the switching switches according to the requirements of the grid-connected system, the system can work in a direct current side series connection mode and a direct current side parallel connection mode according to different working states of the switching switches, the direct current bus voltage grade of a system current conversion system can be improved, or the output power of the system is increased through collecting current on the basis that the direct current side voltage of the current conversion system is not changed, four grid-side inverters are reduced into one, the weight and the cost of equipment are reduced, the line loss of the system is reduced, the control complexity of the system is reduced, and the grid-connected power generation efficiency of the system is improved.
According to one embodiment of the application, the mechanical switch comprises a first single pole double throw switch, a second single pole double throw switch, a third single pole double throw switch, a fourth single pole double throw switch, a fifth single pole double throw switch and a sixth single pole double throw switch.
According to one embodiment of the application, the wind turbine generator comprises a first fan and a second fan; the first fan comprises a first wind wheel and a first motor connected with the first wind wheel, the first output end of the first motor is used as the first output end of the wind turbine generator, and the second output end of the first motor is used as the second output end of the wind turbine generator; the second fan comprises a second wind wheel and a second motor connected with the second wind wheel, the first output end of the second motor serves as the third output end of the wind turbine generator, and the second output end of the second motor serves as the fourth output end of the wind turbine generator.
According to an embodiment of the application, the first and second electrical machines are double-winding single-rotor electrical machines.
According to an embodiment of the application, the first, second, third and fourth rectifiers are full power rectifiers and the inverter is a full power inverter.
According to one embodiment of the application, the motor is a permanent magnet synchronous generator and the wind wheel is a three-blade wind wheel.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a four-input single-output DC series-parallel grid-connected switching system for wind power generation according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a mechanical switch according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a wind turbine generator set in a four-input single-output direct-current series-parallel grid-connected switching system for wind power generation according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The four-input single-output direct current series-parallel grid-connected switching system for wind power generation according to the embodiment of the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a four-input single-output dc series-parallel grid-connected switching system for wind power generation according to an embodiment of the present application, and as shown in fig. 1, the four-input single-output dc series-parallel grid-connected switching system for wind power generation according to the embodiment of the present application may specifically include: wind turbine generator 101, five port converter 102 and grid-connected transformer 103, wherein:
the wind turbine 101 includes a wind rotor 1011 and a motor 1012 corresponding to the wind rotor 1011, and the five-port converter 102 includes a first rectifier 1021, a second rectifier 1022, a third rectifier 1023, a fourth rectifier 1024, an inverter 1025, and a mechanical switch 1026.
The wind wheel 1011 is connected to a motor 1012 corresponding to the wind wheel, and the wind turbine 101 is configured to output a first ac voltage signal U1 and a first ac current signal I1 through a first output terminal, output a second ac voltage signal U2 and a second ac current signal I2 through a second output terminal, output a third ac voltage signal U3 and a third ac current signal I3 through a third output terminal, and output a fourth ac voltage signal U4 and a fourth ac current signal I4 through a fourth output terminal. Wherein, the motor 1012 can be a permanent magnet synchronous generator, and the wind wheel 1011 can be a three-blade wind wheel.
A first output end of the wind turbine generator 101 is connected with an input end of a first rectifier 1021 through a three-phase line, a second output end of the wind turbine generator 101 is connected with an input end of a second rectifier 1022 through a three-phase line, a third output end of the wind turbine generator 101 is connected with an input end of a third rectifier 1023 through a three-phase line, a fourth output end of the wind turbine generator 101 is connected with an input end of a fourth rectifier 1024 through a three-phase line, an output positive end of the first rectifier 1021 is connected with an input positive end of an inverter 1025 through a direct current bus, an output negative end of the first rectifier 1021 is connected with a first free end 201 (shown in fig. 2) of a mechanical switch 1026 through a direct current bus, a first parallel fixed end 202 (shown in fig. 2) of the mechanical switch 1026 is connected with an input negative end of the inverter 1025 through a direct current bus, an output positive end of the second rectifier 1022 is connected with a second free end 203 (shown in fig. 2) of the mechanical switch 1026 through a direct current bus, the second parallel fixed end 204 (shown in fig. 2) of the mechanical switch 1026 is connected to the positive input terminal of the inverter 1024 via a dc bus, the first series fixed end 205 (shown in fig. 2) of the mechanical switch 1026 is connected to the second series fixed end 206 (shown in fig. 2) of the mechanical switch 1026 via a dc bus, the output negative terminal of the second rectifier 1022 is connected to the third free end 207 (shown in fig. 2) of the mechanical switch 1026 via a dc bus, the third parallel fixed end 208 (shown in fig. 2) of the mechanical switch 1026 is connected to the input negative terminal of the inverter 1025 via a dc bus, the output positive terminal of the third rectifier 1023 is connected to the fourth free end 209 (shown in fig. 2) of the mechanical switch 1026 via a dc bus, the fourth parallel fixed end 210 (shown in fig. 2) of the mechanical switch 1026 is connected to the positive input terminal of the inverter 1025 via a dc bus, and the third series fixed end 211 (shown in fig. 2) of the mechanical switch 1026 is connected to the fourth series fixed end 206 (shown in fig. 2) of the mechanical switch via a dc bus The coupling end 212 (as shown in fig. 2) is connected, the output negative end of the third rectifier 1023 is connected with the fifth free end 213 of the mechanical switch 1026 through a dc bus, the fifth parallel fixed end 214 of the mechanical switch 1026 is connected with the input negative end of the inverter 1025 through a dc bus, the output positive end of the fourth rectifier 1024 is connected with the sixth free end 215 of the mechanical switch 1026 through a dc bus, the sixth parallel fixed end 216 of the mechanical switch 1026 is connected with the input positive end of the inverter 1025 through a dc bus, the fifth series fixed end 217 of the mechanical switch 1026 is connected with the sixth series fixed end 218 of the mechanical switch 1026, the output negative end of the fourth rectifier 1024 is connected with the input negative end of the inverter 1025 through a dc bus, and the output end of the inverter 1205 is connected with the grid-connected transformer 103 through a dc bus.
The first free end 201 (shown in fig. 2) of the mechanical switch 1026 switchably connects the first parallel fixed end 202 (shown in fig. 2) of the mechanical switch 1026 and the first series fixed end 205 (shown in fig. 2) of the mechanical switch 1026, the second free end 203 (shown in fig. 2) of the mechanical switch 1026 switchably connects the second parallel fixed end 204 (shown in fig. 2) of the mechanical switch 1026 and the second series fixed end 206 (shown in fig. 2) of the mechanical switch 1026, the third free end 207 (shown in fig. 2) of the mechanical switch 1026 switchably connects the third parallel fixed end 208 (shown in fig. 2) of the mechanical switch 1026 and the third series fixed end 211 (shown in fig. 2) of the mechanical switch 1026, the fourth free end 209 (shown in fig. 2) of the mechanical switch 1026 switchably connects the fourth parallel fixed end 210 (shown in fig. 2) of the mechanical switch 1026 and the fourth series fixed end 212 (shown in fig. 2) of the mechanical switch 1026, the fifth free end 213 (shown in fig. 2) of the mechanical switch 1026 can be switched to connect the fifth parallel fixed end 214 (shown in fig. 2) of the mechanical switch 1026 and the fifth series fixed end 217 (shown in fig. 2) of the mechanical switch 1026, and the sixth free end 215 (shown in fig. 2) of the mechanical switch 1026 can be switched to connect the sixth parallel fixed end 216 (shown in fig. 2) of the mechanical switch 1026 and the sixth series fixed end 218 (shown in fig. 2) of the mechanical switch 1026, so that the system shares two working states of parallel connection (state 1, i.e., the end point corresponding to 1 in fig. 1 is selectively connected) and series connection (state 2, i.e., the end point corresponding to 2 in fig. 1 is selectively connected), and different functions of series-voltage boosting and parallel-current converging on the dc side of the grid-connected system are realized by the action of the switch according to the requirements of the grid-connected system. The first rectifier 1021 may be a full power rectifier, the second rectifier 1022 may be a full power rectifier, the third rectifier 1023 may be a full power rectifier, the fourth rectifier 1024 may be a full power rectifier, and the inverter 1025 may be a full power inverter.
The first rectifier 1021 is used for generating a first direct current voltage signal Ud1 according to the first alternating current voltage signal U1 and generating a first direct current signal Id1 according to the first alternating current signal I1, the output power of the first rectifier 1021 is P1, and the work efficiency is eta1And then:
Figure BDA0003322409500000051
the second rectifier 1022 is used for generating a second dc voltage signal Ud2 according to the second ac voltage signal U2 and generating a second dc current signal Id2 according to the second ac current signal I2, the output power of the second rectifier 1022 is P2, and the operating efficiency is η2And then:
Figure BDA0003322409500000061
the third rectifier 1023 is used for generating a third dc voltage signal Ud3 according to the third ac voltage signal U3 and a third dc current signal Id3 according to the third ac current signal I3, the third rectifier 1023 has an output power P3 and an operating efficiency η3And then:
Figure BDA0003322409500000062
the fourth rectifier 1024 is used for generating a fourth dc voltage signal Ud4 according to the fourth ac voltage signal U4 and generating a fourth dc current signal Id4 according to the fourth ac current signal I4, the output power of the fourth rectifier 1024 is P4, and the operating efficiency is η4And then:
Figure BDA0003322409500000063
the first rectifier 1021, the second rectifier 1022, the third rectifier 1023, and the fourth rectifier 1024 are connected on the dc side, and further connected to the dc input terminal of the inverter 1025, and the dc side of the inverter 1025 inputs the fifth dc voltage signal Ud5 and the fifth dc current signal Id5, wherein the mechanical switch can realize the following two working states by switching:
when the mechanical switch is in the first operation state, the first rectifier 1021, the second rectifier 1022, the third rectifier 1023 and the fourth rectifier 1024 are connected in series on the dc side, and the fifth dc voltage signal Ud5 and the fifth dc current signal Id5 can be obtained based on the following formulas:
Id5＝Id4＝Id3＝Id2＝Id1
Figure BDA0003322409500000064
when the mechanical switch is in the second operation state, the first rectifier 1021, the second rectifier 1022, the third rectifier 1023 and the fourth rectifier 1024 are connected in parallel on the dc side, and the fifth dc voltage signal Ud5 and the fifth dc current signal Id5 can be obtained based on the following formulas:
Ud5＝Ud4＝Ud3＝Ud2＝Ud1
Figure BDA0003322409500000065
the inverter 1025 is configured to generate a fifth ac voltage signal U5 according to the fifth dc voltage signal Ud5, generate a fifth ac current signal I5 according to the fifth dc current signal Id5, and input the fifth ac voltage signal U5 and the fifth ac current signal I5 to the grid-connected transformer 103. Optionally, the inverter 1025 has an operating efficiency η5And the output power is P5, then:
Figure BDA0003322409500000066
optionally, the wind turbine 101 in the embodiment of the present application may include a first wind turbine and a second wind turbine, as shown in fig. 3, the wind turbines may include a first wind turbine 3011 in the first wind turbine and a second wind turbine 3012 in the second wind turbine, and the motors may include a first motor 3021 in the first wind turbine and a second motor 3022 in the second wind turbine, where the first motor 3021 and the second motor 3022 may be a double-winding single-rotor motor including a first stator winding and a second stator winding of a rotor.
In the first fan, a first wind wheel 3011 is connected to a first motor 3021 (specifically, the first wind wheel 3011 is connected to a rotor of the first motor 3021), a first output end of the first motor 3021 is used as a first output end of the wind turbine generator 101, and a second output end of the first motor 3021 is used as a second output end of the wind turbine generator 101. The first wind wheel 3011 rotates under the effect of wind power to drive the rotor of the first motor 3021 to rotate, so that the first motor 3021, specifically, the first stator winding in the first motor 3021, outputs a first ac voltage signal U1 and a first ac current signal I1 from a first output terminal of the first motor 3021, that is, a first output terminal of the wind turbine generator 101, when the first wind wheel 3011 drives the rotor of the first motor 3021 to rotate, and simultaneously, the first motor 3021, specifically, the second stator winding in the first motor 3021, outputs a second ac voltage signal U2 and a second ac current signal I2 from a second output terminal of the first motor 3021, that is, a second output terminal of the wind turbine generator 101, when the first wind wheel 3011 drives the rotor of the first motor 3021 to rotate.
In the second fan, the second wind wheel 3012 is connected to the second motor 3022 (specifically, the second wind wheel 3012 is connected to the rotor of the second motor 3022), the first output end of the second motor 3022 serves as the third output end of the wind turbine generator 101, and the second output end of the second motor 3022 serves as the fourth output end of the wind turbine generator 101. The second wind wheel 3012 rotates under the effect of wind power to drive the rotor of the second motor 3022 to rotate, so that the second motor 3022, specifically, the first stator winding in the second motor 3022, outputs a third ac voltage signal U3 and a third ac current signal I3 from the first output terminal of the second motor 3022, that is, the third output terminal of the wind turbine generator 101, when the second wind wheel 3012 drives the rotor of the second motor 3022 to rotate, and simultaneously, the second motor 3022, specifically, the second stator winding in the second motor 3022, outputs a fourth ac voltage signal U4 and a fourth ac current signal I4 from the second output terminal of the second motor 3022, that is, the fourth output terminal of the wind turbine generator 101, when the second wind wheel 3012 drives the rotor of the second motor 3022 to rotate.
The embodiment of the application provides a four-input single-output direct current series-parallel connection switching system for wind power generation, a wind wheel is connected with a motor corresponding to the wind wheel, a first output end of a wind turbine generator is connected with an input end of a first rectifier, a second output end of the wind turbine generator is connected with an input end of a second rectifier, a third output end of the wind turbine generator is connected with an input end of a third rectifier, a fourth output end of the wind turbine generator is connected with an input end of a fourth rectifier, an output positive end of the first rectifier is connected with an input positive end of an inverter, an output negative end of the first rectifier is connected with a first free end of a mechanical switch, a first parallel connection fixed end of the mechanical switch is connected with an input negative end of the inverter, an output positive end of the second rectifier is connected with a second free end of the mechanical switch, a second parallel connection fixed end of the mechanical switch is connected with an input positive end of the inverter, and a first series connection fixed end of the mechanical switch is connected with a second series connection fixed end of the mechanical switch, the output negative end of the second rectifier is connected with the third free end of the mechanical switch, the third parallel fixed end of the mechanical switch is connected with the input negative end of the inverter, the output positive end of the third rectifier is connected with the fourth free end of the mechanical switch, the fourth parallel fixed end of the mechanical switch is connected with the input positive end of the inverter, the third series fixed end of the mechanical switch is connected with the fourth series fixed end of the mechanical switch, the output negative end of the third rectifier is connected with the fifth free end of the mechanical switch, the fifth parallel fixed end of the mechanical switch is connected with the input negative end of the inverter, the output positive end of the fourth rectifier is connected with the sixth free end of the mechanical switch, the sixth parallel fixed end of the mechanical switch is connected with the input positive end of the inverter, the fifth series fixed end of the mechanical switch is connected with the sixth series fixed end of the mechanical switch, the output negative end of the fourth rectifier is connected with the input negative end of the inverter, the output end of the inverter is connected with the grid-connected transformer, the first parallel fixed end of the mechanical switch and the first series fixed end of the mechanical switch are connected through the first free end of the mechanical switch in a switching mode, the second parallel fixed end of the mechanical switch and the second series fixed end of the mechanical switch are connected through the second free end of the mechanical switch in a switching mode, the third parallel fixed end of the mechanical switch and the third series fixed end of the mechanical switch are connected through the third free end of the mechanical switch in a switching mode, the fourth parallel fixed end of the mechanical switch and the fourth series fixed end of the mechanical switch are connected through the end of the mechanical switch in a switching mode, the fifth parallel fixed end of the mechanical switch and the fifth series fixed end of the mechanical switch are connected through the fifth free end of the mechanical switch in a switching mode, and the sixth parallel fixed end of the mechanical switch and the sixth series fixed end of the mechanical switch are connected through the sixth free end of the mechanical switch in a switching mode. The four-input single-output direct current series-parallel connection grid-connected switching system for wind power generation comprises six sets of mechanical selection switches, different functions of series connection boosting and parallel connection converging of the direct current side of the grid-connected system are achieved through the action of the switching switches according to the requirements of the grid-connected system, the system can work in a direct current side series connection mode and a direct current side parallel connection mode according to different working states of the switching switches, the direct current bus voltage grade of a system current conversion system can be improved, or the output power of the system is increased through collecting current on the basis that the direct current side voltage of the current conversion system is not changed, four grid-side inverters are reduced into one, the weight and the cost of equipment are reduced, the line loss of the system is reduced, the control complexity of the system is reduced, and the grid-connected power generation efficiency of the system is improved.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims (6)

1. A four-input single-output direct current series-parallel connection grid-connection switching system for wind power generation is characterized by comprising: the wind power generation system comprises a wind power generation set, a five-port converter and a grid-connected transformer, wherein the wind power generation set comprises a wind wheel and a motor corresponding to the wind wheel, and the five-input-port converter comprises a first rectifier, a second rectifier, a third rectifier, a fourth rectifier, an inverter and a mechanical switch;
the wind wheel is connected with the motor corresponding to the wind wheel;
the first output end of the wind turbine generator is connected with the input end of the first rectifier, the second output end of the wind turbine generator is connected with the input end of the second rectifier, the third output end of the wind turbine generator is connected with the input end of the third rectifier, the fourth output end of the wind turbine generator is connected with the input end of the fourth rectifier, the positive output end of the first rectifier is connected with the positive input end of the inverter, the negative output end of the first rectifier is connected with the first free end of the mechanical switch, the first parallel fixed end of the mechanical switch is connected with the negative input end of the inverter, the positive output end of the second rectifier is connected with the second free end of the mechanical switch, the second parallel fixed end of the mechanical switch is connected with the input end of the inverter, the first serial fixed end of the mechanical switch is connected with the second serial fixed end of the mechanical switch, the output negative end of the second rectifier is connected with the third free end of the mechanical switch, the third parallel fixed end of the mechanical switch is connected with the input negative end of the inverter, the output positive end of the third rectifier is connected with the fourth free end of the mechanical switch, the fourth parallel fixed end of the mechanical switch is connected with the input positive end of the inverter, the third series fixed end of the mechanical switch is connected with the fourth series fixed end of the mechanical switch, the output negative end of the third rectifier is connected with the fifth free end of the mechanical switch, the fifth parallel fixed end of the mechanical switch is connected with the input negative end of the inverter, the output positive end of the fourth rectifier is connected with the sixth free end of the mechanical switch, the sixth parallel fixed end of the mechanical switch is connected with the input positive end of the inverter, the fifth series fixed end of the mechanical switch is connected with the sixth series fixed end of the mechanical switch, the output negative terminal of the fourth rectifier is connected with the input negative terminal of the inverter, the output terminal of the inverter is connected with the grid-connected transformer, the first free terminal of the mechanical switch is connected with the first parallel fixed terminal of the mechanical switch and the first series fixed terminal of the mechanical switch, the second free terminal of the mechanical switch is connected with the second parallel fixed terminal of the mechanical switch and the second series fixed terminal of the mechanical switch, the third free terminal of the mechanical switch is connected with the third parallel fixed terminal of the mechanical switch and the third series fixed terminal of the mechanical switch, the fourth free terminal of the mechanical switch is connected with the fourth parallel fixed terminal of the mechanical switch and the fourth series fixed terminal of the mechanical switch, and the fifth free terminal of the mechanical switch is connected with the fifth parallel fixed terminal of the mechanical switch and the fifth series fixed terminal of the mechanical switch, and the sixth free end of the mechanical switch is switched and connected with the sixth parallel fixed end of the mechanical switch and the sixth series fixed end of the mechanical switch.
2. The four-input single-output direct-current series-parallel grid-connection switching system for wind power generation according to claim 1, wherein the mechanical switch includes a first single-pole double-throw switch, a second single-pole double-throw switch, a third single-pole double-throw switch, a fourth single-pole double-throw switch, a fifth single-pole double-throw switch, and a sixth single-pole double-throw switch.
3. The four-input single-output direct current series-parallel grid-connected switching system for wind power generation according to claim 1, wherein the wind turbine generator comprises a first fan and a second fan;
the first fan comprises a first wind wheel and a first motor connected with the first wind wheel, the first output end of the first motor is used as the first output end of the wind turbine generator, and the second output end of the first motor is used as the second output end of the wind turbine generator;
the second fan comprises a second wind wheel and a second motor connected with the second wind wheel, the first output end of the second motor serves as the third output end of the wind turbine generator, and the second output end of the second motor serves as the fourth output end of the wind turbine generator.
4. The four-input single-output direct-current series-parallel grid-connected switching system for wind power generation according to claim 3, wherein the first motor and the second motor are double-winding single-rotor motors.
5. The system of claim 1, wherein the first, second, third and fourth rectifiers are full power rectifiers and the inverter is a full power inverter.
6. The four-input single-output direct-current series-parallel grid-connected switching system for wind power generation according to claim 1, wherein the motor is a permanent magnet synchronous generator, and the wind wheel is a three-blade wind wheel.
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