CN114123310A - Direct-current series unified grid-connected system with double serial wind wheels and single motor - Google Patents

Direct-current series unified grid-connected system with double serial wind wheels and single motor Download PDF

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Publication number
CN114123310A
CN114123310A CN202111250413.1A CN202111250413A CN114123310A CN 114123310 A CN114123310 A CN 114123310A CN 202111250413 A CN202111250413 A CN 202111250413A CN 114123310 A CN114123310 A CN 114123310A
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rectifier
current signal
direct current
motor
wind wheel
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郭小江
秦猛
李铮
孙财新
付明志
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Huaneng Clean Energy Research Institute
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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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  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The application provides a unified grid-connected system of tandem double wind wheel single motor direct current series connection includes: the first wind wheel and the second wind wheel are respectively connected with a motor, the motor is respectively connected with the input ends of the first rectifier and the second 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 output positive end of the second rectifier, the output negative end of the second rectifier is connected with the input negative end of the inverter, and the output end of the inverter is connected with the grid-connected transformer. By adding a set of wind turbine system, the pneumatic energy capturing capability is improved, and the energy utilization rate of the system is improved; a double-winding double-rotor generator is adopted, so that the energy density and the generating efficiency of the unit are improved; by improving the voltage level of the direct current bus of the converter system, the output power of the system is improved, the voltage level of the alternating current output side is raised, the output capacity of a unit is increased, 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

Direct-current series unified grid-connected system with double serial wind wheels and single motor
Technical Field
The application relates to the technical field of wind power generation, in particular to a direct-current series unified grid-connected system with double serial wind wheels and a single motor.
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 series unified grid-connected system with two wind wheels and a single motor in series, so as to improve the energy utilization rate of the system, improve the energy density and the power generation efficiency of the unit, improve the output power of the system, increase the output capacity of the unit, reduce the line loss of the system, reduce the control complexity of the system, and improve the grid-connected power generation efficiency of the system.
In order to achieve the above object, an embodiment of the first aspect of the present application provides a serial double-wind wheel single-motor dc serial unified grid-connected system, including: the wind turbine comprises a fan, a three-port converter and a grid-connected transformer, wherein the fan comprises a first wind wheel, a second wind wheel and a motor, and the three-port converter comprises a first rectifier, a second rectifier and an inverter; the first wind rotor and the second wind rotor are respectively connected with the motor, and the motor is used for outputting a first alternating current voltage signal U1 and a first alternating current signal I1 when the first wind rotor rotates, and outputting a second alternating current voltage signal U2 and a second alternating current signal I2 when the second wind rotor rotates; the motor is respectively connected with the input end of the first rectifier and the input end of the second 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 positive output end of the second rectifier, the negative output end of the second rectifier is connected with the negative input end of the inverter, and the output end of the inverter is connected with the input end of the grid-connected transformer; the first rectifier is configured to generate a first dc voltage signal Ud1 according to the first ac current signal U1 and generate a first dc current signal Id1 according to the first ac current signal I1, the second rectifier is configured to generate a second dc voltage signal Ud2 according to the second ac voltage signal U2 and generate a second dc current signal Id2 according to the second ac current signal I2, the inverter is configured to generate a third ac voltage signal U3 according to the third dc voltage signal U3, generate a third ac current signal I3 according to a third dc current signal Id3, and input the third ac voltage signal U3 and the third ac current signal I3 to an input terminal of the grid-connected transformer, wherein the third dc voltage signal Ud3 is obtained according to the first dc voltage signal Ud1 and the second dc voltage signal Ud2, and the third dc voltage signal Ud3 is obtained according to the first dc voltage signal Ud1 and the second dc voltage signal Id1 or the second dc current signal Id3 The current signal Id2 is obtained.
The tandem double-wind-wheel single-motor direct-current series unified grid-connected system provided by the embodiment of the application is characterized in that a first wind wheel and a second wind wheel are respectively connected with a motor, the motor is used for outputting a first alternating-current voltage signal U1 and a first alternating-current signal I1 when the first wind wheel rotates and outputting a second alternating-current voltage signal U2 and a second alternating-current signal I2 when the second wind wheel rotates, the motor is respectively connected with the input end of a first rectifier and the input end of a second rectifier, the output positive end of the first rectifier is connected with the input positive end of an inverter, the output negative end of the first rectifier is connected with the output positive end of the second rectifier, the output negative end of the second rectifier is connected with the input negative end of the inverter, the first rectifier is used for generating a first direct-current voltage signal Ud1 according to the first alternating-current signal U1 and generating a first direct-current signal Id1 according to the first alternating-current signal I1, the second rectifier is used for generating a second direct current voltage signal Ud2 according to a second alternating current signal U2 and generating a second direct current signal Id2 according to a second alternating current signal I2, the inverter is used for generating a third alternating current signal U3 according to a third direct current signal Ud3, generating a third alternating current signal I3 according to a third direct current signal Id3, and inputting the third alternating current signal U3 and a third alternating current signal I3 to the input end of the grid-connected transformer, wherein the third direct current voltage signal Ud3 is obtained according to the first direct current voltage signal Ud1 and the second direct current signal Ud2, and the third direct current signal Id3 is obtained according to the first direct current signal Id1 and/or the second direct current signal Id 2. According to the tandem double-wind-wheel single-motor direct-current series unified grid-connected system provided by the embodiment of the application, two wind wheels are adopted to drive one motor, the motor is connected and connected through the three-port converter, the function of serially connecting and lifting direct-current voltage is realized, the pneumatic energy capturing capacity is improved by adding one wind machine system, and the energy utilization rate of the system is improved; the traditional generator is changed into a double-winding double-rotor generator, so that the energy density and the generating efficiency of the generator set are improved; by improving the voltage level of the direct current bus of the converter system, the output power of the system is improved, the voltage level of the alternating current output side can be raised, the output capacity of a unit is increased, 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 electric machine is a permanent magnet synchronous generator.
According to one embodiment of the application, the electric machine is a double winding, double rotor electric machine.
According to one embodiment of the application, the first rectifier is a full power rectifier.
According to one embodiment of the application, the second rectifier is a full power rectifier.
According to one embodiment of the application, the inverter is a full power inverter.
According to an embodiment of the application, the first wind wheel is a three-bladed wind wheel.
According to an embodiment of the application, the second wind wheel is a three-bladed 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 series-parallel double-wind-wheel single-motor direct-current series-parallel unified grid-connected 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 following describes a series double wind wheel single motor direct current series unified grid-connected system according to an embodiment of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a series-parallel single-wind-wheel single-motor dc series-connection unified grid-connected system according to an embodiment of the present application, and as shown in fig. 1, the series-parallel single-wind-wheel single-motor dc series-connection unified grid-connected system according to the embodiment of the present application may specifically include: fan 101, three-port converter 102 and grid-connected transformer 103, wherein:
the fan 101 comprises a first wind wheel 1011, a second wind wheel 1012 and a motor 1013, and the three-port converter 102 comprises a first rectifier 1021, a second rectifier 1022 and an inverter 1023, wherein the motor 1013 may specifically be a double-winding, double-rotor motor, and may comprise a first rotor, a first stator winding corresponding to the first rotor, a second rotor and a second stator winding corresponding to the second rotor.
First wind wheel 1011 and second wind wheel 1012 are connected with motor 1013 (specifically, first rotor of first wind wheel 1011 and motor 1013, second rotor of second wind wheel 1012 and motor 1013) respectively, first wind wheel 1011 rotates under the effect of wind to drive the first rotor of motor 1013 to rotate, and motor 1013, specifically, the first stator winding of motor 1013 is used to output first alternating current signal U1 and first alternating current signal I1 when first wind wheel 1011 drives the first rotor of motor 1013 to rotate. Similarly, the second wind wheel 1012 rotates under the action of wind to drive the second rotor of the motor 1013 to rotate, and the motor 1013, specifically the second stator winding of the motor 1013, is configured to output a second ac voltage signal U2 and a second ac current signal I2 when the second wind wheel 1012 drives the second rotor of the motor 1013 to rotate. The motor 1013 may be a permanent magnet synchronous generator, and the first wind wheel 1011 and/or the second wind wheel 1012 may be a three-blade wind wheel, that is, any one of the first wind wheel 1011 and the second wind wheel 1012 may be a three-blade wind wheel.
The motor 1013 (specifically, the first stator winding of the motor 1013) is connected to the input end of a first rectifier 1021 through a three-phase line, meanwhile, the motor 1013 (specifically, the second stator winding of the motor 1013) is connected to the input end of a second rectifier 1022 through a three-phase line, the positive output end of the first rectifier 1021 is connected to the positive input end of an inverter 1023 through a dc bus, the negative output end of the first rectifier 1021 is connected to the positive output end of the second rectifier 1022 through a dc bus, the negative output end of the second rectifier 1022 is connected to the negative input end of an inverter 1023 through a dc bus, the output end of the inverter 1023 is connected to the input end of a grid-connected transformer 103 through a three-phase line, that is, the two input ends of the three-port converter 102 are the first rectifier 1021 and the second rectifier 1022 on the motor side, the dc voltage is raised through the dc bus in series, and then the grid-connected by the grid-side inverter 1023 uniformly, after the medium-voltage grid connection is realized, the medium-voltage grid system can be directly accessed. The first rectifier 1021 may be a full power rectifier, the second rectifier 1022 may be a full power rectifier, and the inverter 1023 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 I1The first rectifier 1021 has output power P1 and working efficiency eta1And then:
Figure BDA0003322412080000041
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 BDA0003322412080000042
based on the above description of the connection manner of the first rectifier 1021, the second rectifier 1022 and the inverter 1023 in the embodiment of the present application, it can be seen that the first rectifier 1021 and the second rectifier 1022 are connected in series on the dc side and then connected to the dc input terminal of the inverter 1023, the inverter 1023 is input with the third dc voltage signal Ud3, and the inverter 1023 is input with the third dc current signal Id3, where the third dc voltage signal Ud3 and the third dc current signal Id3 can be obtained based on the following formulas:
Id3＝Id2＝Id1
Figure BDA0003322412080000043
the inverter 1023 is configured to generate a third ac voltage signal U3 according to the third dc voltage signal Ud3, and a third ac current signal I3 according to the third dc current signal Id3, and input the third ac voltage signal U3 and the third ac current signal I3 to the input terminal of the grid-connected transformer 103. Optionally, the inverter 1023 has an operating efficiency η3And the inverter 1023 outputs power P3, then:
Figure BDA0003322412080000044
the tandem double-wind-wheel single-motor direct-current series unified grid-connected system provided by the embodiment of the application is characterized in that a first wind wheel and a second wind wheel are respectively connected with a motor, the motor is used for outputting a first alternating-current voltage signal U1 and a first alternating-current signal I1 when the first wind wheel rotates and outputting a second alternating-current voltage signal U2 and a second alternating-current signal I2 when the second wind wheel rotates, the motor is respectively connected with the input end of a first rectifier and the input end of a second rectifier, the output positive end of the first rectifier is connected with the input positive end of an inverter, the output negative end of the first rectifier is connected with the output positive end of the second rectifier, the output negative end of the second rectifier is connected with the input negative end of the inverter, the first rectifier is used for generating a first direct-current voltage signal Ud1 according to the first alternating-current signal U1 and generating a first direct-current signal Id1 according to the first alternating-current signal I1, the second rectifier is used for generating a second direct current voltage signal Ud2 according to a second alternating current signal U2 and generating a second direct current signal Id2 according to a second alternating current signal I2, the inverter is used for generating a third alternating current signal U3 according to a third direct current signal Ud3, generating a third alternating current signal I3 according to a third direct current signal Id3, generating a third alternating current signal, and inputting the third alternating current signal U3 and a third alternating current signal I3 to the input end of the grid-connected transformer, wherein the third direct current voltage signal Ud3 is obtained according to the first direct current voltage signal Ud1 and the second direct current signal Ud2, and the third direct current signal Id3 is obtained according to the first direct current signal Id1 and/or the second direct current signal Id 2. According to the tandem double-wind-wheel single-motor direct-current series unified grid-connected system provided by the embodiment of the application, two three-blade wind wheels are adopted to drive a double-winding double-rotor permanent magnet synchronous motor, the double-winding double-rotor permanent magnet synchronous motor is connected and connected through a full-power three-port converter, the function of serially connecting and lifting direct-current voltage is realized, the pneumatic energy capture capacity is improved and the energy utilization rate of the system is improved by adding one wind turbine system; the traditional generator is changed into a double-winding double-rotor generator, so that the energy density and the generating efficiency of the generator set are improved; by improving the voltage level of the direct current bus of the converter system, the output power of the system is improved, the voltage level of the alternating current output side can be raised, the output capacity of a unit is increased, 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 (8)

1. The utility model provides a two wind wheel single motor direct current of tandem series connection unified and are incorporated into power networks system which characterized in that includes: the wind turbine comprises a fan, a three-port converter and a grid-connected transformer, wherein the fan comprises a first wind wheel, a second wind wheel and a motor, and the three-port converter comprises a first rectifier, a second rectifier and an inverter;
the first wind rotor and the second wind rotor are respectively connected with the motor, and the motor is used for outputting a first alternating current voltage signal U1 and a first alternating current signal I1 when the first wind rotor rotates, and outputting a second alternating current voltage signal U2 and a second alternating current signal I2 when the second wind rotor rotates;
the motor is respectively connected with the input end of the first rectifier and the input end of the second 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 positive output end of the second rectifier, the negative output end of the second rectifier is connected with the negative input end of the inverter, and the output end of the inverter is connected with the input end of the grid-connected transformer;
the first rectifier is used for generating a first direct current voltage signal Ud1 according to the first alternating current U1 and generating a first direct current signal Id1 according to the first alternating current signal I1;
the second rectifier is used for generating a second direct current signal Id2 according to the second alternating current signal U2 and a second direct current signal Ud2 according to the second alternating current signal I2;
the inverter is used for generating a third alternating current signal U3 according to a third direct current signal Ud3, generating a third alternating current signal I3 according to a third direct current signal Id3, and inputting the third alternating current signal U3 and the third alternating current signal I3 to the input end of the grid-connected transformer, wherein the third direct current signal Ud3 is obtained according to the first direct current signal Ud1 and the second direct current signal Ud2, and the third direct current signal Id3 is obtained according to the first direct current signal Id1 and/or the second direct current signal Id 2.
2. The series double wind wheel single motor direct current series unified grid-connected system according to claim 1, wherein the motor is a permanent magnet synchronous generator.
3. The tandem double wind wheel single motor direct current series unified grid-connected system according to claim 1, wherein the motor is a double winding double rotor motor.
4. The tandem double wind wheel single motor direct current series unified grid-connected system according to claim 1, wherein the first rectifier is a full power rectifier.
5. The tandem double wind wheel single motor direct current series unified grid-connected system according to claim 1, wherein the second rectifier is a full power rectifier.
6. The tandem double wind wheel single motor direct current series unified grid-connected system according to claim 1, wherein the inverter is a full power inverter.
7. The series double-wind-wheel single-motor direct-current series unified grid-connected system according to claim 1, wherein the first wind wheel is a three-blade wind wheel.
8. The series double wind wheel single motor direct current series unified grid-connected system of claim 1, characterized in that the second wind wheel is a three-blade wind wheel.
CN202111250413.1A 2021-10-26 2021-10-26 Direct-current series unified grid-connected system with double serial wind wheels and single motor Withdrawn CN114123310A (en)

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