CN113915064A - Direct-current parallel four-input double-output unified grid-connected wind power generation system - Google Patents

Direct-current parallel four-input double-output unified grid-connected wind power generation system Download PDF

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CN113915064A
CN113915064A CN202111250401.9A CN202111250401A CN113915064A CN 113915064 A CN113915064 A CN 113915064A CN 202111250401 A CN202111250401 A CN 202111250401A CN 113915064 A CN113915064 A CN 113915064A
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inverter
rectifier
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grid
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秦猛
郭小江
李春华
孙财新
付明志
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Huaneng Clean Energy Research Institute
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/20—Wind motors characterised by the driven apparatus
    • F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
    • F03D9/255—Wind motors characterised by the driven apparatus the apparatus being an electrical generator connected to electrical distribution networks; Arrangements therefor
    • 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
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
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  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Abstract

The application provides a direct current connects in parallel four input dual output unified grid-connected wind power generation system, includes: the wind wheel is connected with the motor corresponding to the wind wheel, the output end of the wind turbine generator is connected with the input end of the rectifier, the output positive end of the rectifier is connected with the input positive ends of the first inverter and the second inverter, the output negative end of the rectifier is connected with the input negative ends of the first inverter and the second inverter, the output end of the first inverter is connected with the first input end of the grid-connected transformer, and the output end of the second inverter is connected with the second input end of the grid-connected transformer. The double-winding single-rotor permanent magnet synchronous generator is adopted, so that the energy density and the generating efficiency of the generator set are improved, and the fault redundancy and the reliability of a system are enhanced; on the basis that the direct-current side voltage of the converter system is not changed, the output power of the system is increased by collecting current, four grid-side inverters are reduced to two, the weight and the cost of equipment are reduced, the system loss is reduced, and the grid-connected power generation efficiency is improved.

Description

Direct-current parallel four-input double-output unified grid-connected wind power generation system
Technical Field
The application relates to the technical field of wind power generation, in particular to a direct-current parallel four-input double-output unified grid-connected wind power generation system.
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 dc parallel four-input dual-output unified grid-connected wind power generation system, so as to improve the energy density and the power generation efficiency of a unit, enhance the redundancy and reliability of system faults, increase the output power of the system, reduce the weight and cost of equipment, reduce the system loss, and improve the grid-connected power generation efficiency.
In order to achieve the above object, an embodiment of the first aspect of the present application provides a dc parallel four-input dual-output unified grid-connected wind power generation system, which includes: the wind power generation system comprises a wind power generation set, a six-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, the six-port converter comprises a first rectifier, a second rectifier, a third rectifier, a fourth rectifier, a first inverter and a second inverter, and the grid-connected transformer is a double-split transformer; the wind wheel with the motor that the wind wheel corresponds is connected the first output of wind turbine generator system with the input of first rectifier is connected, the second output of wind turbine generator system with the input of second rectifier is connected, the third output of wind turbine generator system with the input of third rectifier is connected, the fourth output of wind turbine generator system with the input of fourth rectifier is connected, the positive output end of first rectifier respectively with the positive input end of first dc-to-ac converter with the positive input end of second inverter is connected, the negative output end of first rectifier respectively with the negative input end of first dc-to-ac converter with the negative input end of second inverter is connected, the positive output end of second rectifier respectively with the positive input end of first dc-to-ac converter with the positive input end of second inverter is connected, the negative output end of second rectifier respectively with the negative input end of first dc-to-ac converter with the negative input end of second inverter The input negative end of the converter is connected, the output positive end of the third rectifier is respectively connected with the input positive end of the first inverter and the input positive end of the second inverter, the output negative end of the third rectifier is respectively connected with the input negative end of the first inverter and the input negative end of the second inverter, the output end of the first inverter is connected with the first input end of the grid-connected transformer, and the output end of the second inverter is connected with the second input end of the grid-connected transformer.
The direct-current parallel four-input double-output unified grid-connected wind power generation system provided by the embodiment of the application comprises a wind wheel connected with a motor corresponding to the wind wheel, a first output end of a wind turbine generator set connected with an input end of a first rectifier, a second output end of the wind turbine generator set connected with an input end of a second rectifier, a third output end of the wind turbine generator set connected with an input end of a third rectifier, a fourth output end of the wind turbine generator set connected with an input end of a fourth rectifier, an output positive end of the first rectifier is respectively connected with an input positive end of a first inverter and an input positive end of a second inverter, an output negative end of the first rectifier is respectively connected with an input negative end of the first inverter and an input negative end of the second inverter, an output positive end of the second rectifier is respectively connected with an input positive end of the first inverter and an input positive end of the second inverter, an output negative end of the second rectifier is respectively connected with an input negative end of the first inverter and an input negative end of the second inverter, the output positive end of the third rectifier is respectively connected with the input positive end of the first inverter and the input positive end of the second inverter, the output negative end of the third rectifier is respectively connected with the input negative end of the first inverter and the input negative end of the second inverter, the output end of the first inverter is connected with the first input end of the grid-connected transformer, and the output end of the second inverter is connected with the second input end of the grid-connected transformer. According to the direct-current parallel four-input double-output unified grid-connected wind power generation system, the two double-winding single-rotor permanent magnet synchronous generators are dragged by the two three-blade wind wheels, the two double-winding single-rotor permanent magnet synchronous generators are connected through the six-port converter and are connected with the grid, the parallel connection and confluence function is realized, the two grid-side inverters are connected in parallel to form two paths of output, and the flexibility and the response capability of the system are enhanced. The double-winding synchronous generator is adopted, so that the energy density and the generating efficiency of the generator set are improved, and the fault redundancy and the reliability of a system are enhanced; on the basis that the direct-current side voltage of the converter system is not changed, the output power of the system is increased through the collected current, and the grid-connected power generation efficiency is improved.
According to one embodiment of the application, the electric machine is a permanent magnet synchronous generator.
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 first and second inverters are full power inverters.
According to one embodiment of the application, the rotor is a three-bladed rotor.
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 direct-current parallel four-input dual-output unified grid-connected wind power generation system according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a wind turbine generator set in a direct-current parallel four-input dual-output unified grid-connected wind power generation system 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 direct-current parallel four-input and two-output unified grid-connected wind power generation system according to the embodiment of the present application is described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a direct-current parallel four-input dual-output unified grid-connected wind power generation system according to an embodiment of the present application, and as shown in fig. 1, the direct-current parallel four-input dual-output unified grid-connected wind power generation system according to the embodiment of the present application may specifically include: wind turbine generator 101, six port converters 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, and the six-port converter 102 includes a first rectifier 1021, a second rectifier 1022, a third rectifier 1023, a fourth rectifier 1024, a first inverter 1025, and a second inverter 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.
The first output end of the wind turbine generator 101 is connected with the input end of a first rectifier 1021 through a three-phase line, the second output end of the wind turbine generator 101 is connected with the input end of a second rectifier 1022 through a three-phase line, the third output end of the wind turbine generator 101 is connected with the input end of a third rectifier 1023 through a three-phase line, the fourth output end of the wind turbine generator 101 is connected with the input end of a fourth rectifier 1024 through a three-phase line, the positive output ends of the first rectifier 1021 are respectively connected with the positive input end of a first inverter 1025 and the positive input end of a second inverter 1026 through direct current buses, the negative output end of the first rectifier 1021 is respectively connected with the negative input end of the first inverter 1025 and the negative input end of the second inverter 1026 through direct current buses, the positive output end of the second rectifier is respectively connected with the positive input end of the first inverter 1025 and the positive input end of the second inverter 1022 through direct current buses, the output negative terminal of the second rectifier 1022 is connected with the input negative terminal of the first inverter 1025 and the input negative terminal of the second inverter 1026 through a dc bus, respectively, the output positive terminal of the third rectifier 1023 is connected with the input positive terminal of the first inverter 1025 and the input positive terminal of the second inverter 1026 through a dc bus, respectively, the output negative terminal of the third rectifier 1023 is connected with the input negative terminal of the first inverter 1025 and the input negative terminal of the second inverter 1026 through a dc bus, respectively, the output positive terminal of the fourth rectifier 1024 is connected with the input positive terminal of the first inverter 1025 and the input positive terminal of the second inverter 1026 through a dc bus, respectively, the output negative terminal of the fourth rectifier 1024 is connected with the input negative terminal of the first inverter 1025 and the input negative terminal of the second inverter 1026 through a dc bus, respectively, the output terminal of the first inverter is connected with the first input terminal of the grid-connected transformer 103 through a three-phase line, namely, the four-port converter 102 has four-machine-side input terminals of a first rectifier 1021, a second rectifier 1022, a third rectifier 1023, and a fourth rectifier 1024 on the motor side, and after parallel connection and confluence through a dc bus, the four-machine-side input terminals are collectively connected to the grid by a first inverter 1025 and a second inverter 1026 connected in parallel on the grid side. 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, the first inverter 1025 may be a full power inverter, the second inverter 1026 may be a full power inverter, and the grid-connected transformer 103 may be a double split transformer.
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 eta1Then, then
Figure BDA0003322410480000041
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 BDA0003322410480000042
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 BDA0003322410480000043
a fourth rectifier 1024 for rectifying a fourth alternating currentThe voltage signal U4 generates a fourth DC voltage signal Ud4, and generates a fourth DC current signal Id4 according to a fourth AC current signal I4, the output power of the fourth rectifier 1024 is P4, and the working efficiency is eta4And then:
Figure BDA0003322410480000044
based on the above description of the connection manner of the first rectifier 1021, the second rectifier 1022, the third rectifier 1023, the fourth rectifier 1024, the first inverter 1025 and the second inverter 1026 in the embodiment of the present application, it can be seen that 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 then connected to the dc input terminals of the first inverter 1025 and the second inverter 1026 connected in parallel on the dc side, the first inverter 1025 is dc-input with the fifth dc voltage signal Ud5 and the fifth dc current signal Id5, and the second inverter 1026 is dc-input with the sixth dc voltage signal Ud6 and the sixth dc current signal Id6, wherein the fifth dc voltage signal Ud5, the fifth dc current signal Id5, the sixth dc voltage signal Ud6 and the sixth dc current signal Id6 can be obtained based on the following formulas:
Ud6＝Ud5＝Ud4＝Ud3＝Ud2＝Ud1
Figure BDA0003322410480000051
wherein eta is5For the operating efficiency, eta, of the first inverter 10256For the second inverter 1026 to operate efficiently.
The first inverter 1025 is configured to generate a fifth ac voltage signal U5 according to the fifth dc voltage signal Ud5, and 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 first input terminal of the grid-connected transformer 103. Optionally, the first inverter 1025 has an operating efficiency η5And the output power is P5, then:
P5＝η5×Ud5×Id5
the second inverter 1026 is configured to generate a sixth ac voltage signal U6 according to the sixth dc voltage signal Ud6, and generate a sixth ac current signal I6 according to the sixth dc current signal Id6, and input the sixth ac voltage signal U6 and the sixth ac current signal I6 to the second input terminal of the grid-connected transformer 103. Optionally, the second inverter 1026 has an operating efficiency η6And the output power is P6, then:
P6＝η6×Ud6×Id6
optionally, the wind turbine generator 101 in the embodiment of the present application may include a first fan and a second fan, as shown in fig. 2, the fans may include a first wind wheel 2011 in the first fan and a second wind wheel 2012 in the second fan, and the motors may include a first motor 2021 in the first fan and a second motor 2022 in the second fan, where the first motor 2021 and the second motor 2022 may be double-winding single-rotor motors including a first stator winding and a second stator winding of a rotor.
In the first fan, a first wind wheel 2011 is connected with a first motor 2021 (specifically, a rotor of the first wind wheel 2011 and the first motor 2021), a first output end of the first motor 2021 serves as a first output end of the wind turbine generator 101, and a second output end of the first motor 2021 serves as a second output end of the wind turbine generator 101. The first wind wheel 2011 rotates under the action of wind power to drive the rotor of the first motor 2021 to rotate, so that the first motor 2021, specifically, the first stator winding in the first motor 2021 outputs a first ac voltage signal U1 and a first ac current signal I1 from the first output end of the first motor 2021, that is, the first output end of the wind turbine generator 101, when the first wind wheel 2011 drives the rotor of the first motor 2021 to rotate, and at the same time, the first motor 2021, specifically, the second stator winding in the first motor 2021 outputs a second ac voltage signal U2 and a second ac current signal I2 from the second output end of the first motor 2021, that is, the second output end of the wind turbine generator 101, when the first wind wheel 2011 drives the rotor of the first motor 2021 to rotate.
In the second wind turbine, the second wind wheel 2012 is connected to a second electric machine 2022 (specifically, the second wind wheel 2012 is connected to a rotor of the second electric machine 2022), a first output end of the second electric machine 2022 serves as a third output end of the wind turbine generator 101, and a second output end of the second electric machine 2022 serves as a fourth output end of the wind turbine generator 101. The second wind wheel 2012 rotates under the action of wind power to drive the rotor of the second electric machine 2022 to rotate, so that the second electric machine 2022, specifically the first stator winding in the second electric machine 2022, outputs a third ac voltage signal U3 and a third ac current signal I3 from the first output end of the second electric machine 2022, that is, the third output end of the wind turbine generator 101, when the second wind wheel 2012 drives the rotor of the second electric machine 2022 to rotate, and simultaneously causes the second electric machine 2022, specifically the second stator winding in the second electric machine 2022, to output a fourth ac voltage signal U4 and a fourth ac current signal I4 from the second output end of the second electric machine 2022, that is, the fourth output end of the wind turbine generator 101, when the second wind wheel 2012 drives the rotor of the second electric machine 2022 to rotate.
The direct-current parallel four-input double-output unified grid-connected wind power generation system provided by the embodiment of the application comprises a wind wheel connected with a motor corresponding to the wind wheel, a first output end of a wind turbine generator set connected with an input end of a first rectifier, a second output end of the wind turbine generator set connected with an input end of a second rectifier, a third output end of the wind turbine generator set connected with an input end of a third rectifier, a fourth output end of the wind turbine generator set connected with an input end of a fourth rectifier, an output positive end of the first rectifier is respectively connected with an input positive end of a first inverter and an input positive end of a second inverter, an output negative end of the first rectifier is respectively connected with an input negative end of the first inverter and an input negative end of the second inverter, an output positive end of the second rectifier is respectively connected with an input positive end of the first inverter and an input positive end of the second inverter, an output negative end of the second rectifier is respectively connected with an input negative end of the first inverter and an input negative end of the second inverter, the output positive end of the third rectifier is respectively connected with the input positive end of the first inverter and the input positive end of the second inverter, the output negative end of the third rectifier is respectively connected with the input negative end of the first inverter and the input negative end of the second inverter, the output end of the first inverter is connected with the first input end of the grid-connected transformer, and the output end of the second inverter is connected with the second input end of the grid-connected transformer. According to the direct-current parallel four-input double-output unified grid-connected wind power generation system, two three-blade wind wheels are adopted to drag two double-winding single-rotor permanent magnet synchronous generators, and the two double-winding single-rotor permanent magnet synchronous generators are connected and connected through a full-power six-port converter, so that the direct-current bus parallel connection and confluence function is realized; on the basis that the direct-current side voltage of the converter system is not changed, the output power of the system is increased through the collected current, and the grid-connected power generation efficiency 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. The utility model provides a direct current four input dual output unification grid-connected wind power generation system that connects in parallel which characterized in that includes: the wind power generation system comprises a wind power generation set, a six-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, the six-port converter comprises a first rectifier, a second rectifier, a third rectifier, a fourth rectifier, a first inverter and a second inverter, and the grid-connected transformer is a double-split transformer;
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 respectively connected with the positive input end of the first inverter and the positive input end of the second inverter, the negative output end of the first rectifier is respectively connected with the negative input end of the first inverter and the negative input end of the second inverter, the positive output end of the second rectifier is respectively connected with the positive input end of the first inverter and the positive input end of the second inverter, the negative output end of the second rectifier is respectively connected with the negative input end of the first inverter and the negative input end of the second inverter, the output positive end of the third rectifier is connected with the input positive end of the first inverter and the input positive end of the second inverter respectively, the output negative end of the third rectifier is connected with the input negative end of the first inverter and the input negative end of the second inverter respectively, the output end of the first inverter is connected with the first input end of the grid-connected transformer, and the output end of the second inverter is connected with the second input end of the grid-connected transformer.
2. The direct-current parallel four-input dual-output unified grid-connected wind power generation system according to claim 1, wherein the motor is a permanent magnet synchronous generator.
3. The direct-current parallel four-input dual-output unified grid-connected wind power generation system 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 direct-current parallel four-input dual-output unified grid-connected wind power generation system according to claim 3, wherein the first and second motors are dual-winding single-rotor motors.
5. The dc parallel four-input dual-output unified grid-connected wind power generation system according to claim 1, wherein the first rectifier, the second rectifier, the third rectifier and the fourth rectifier are full power rectifiers, and the first inverter and the second inverter are full power inverters.
6. The direct-current parallel four-input dual-output unified grid-connected wind power generation system according to claim 1, wherein the wind wheel is a three-blade wind wheel.
CN202111250401.9A 2021-10-26 2021-10-26 Direct-current parallel four-input double-output unified grid-connected wind power generation system Withdrawn CN113915064A (en)

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