CN113937814B - Double wind wheel double motor direct current series-parallel connection switching unified grid-connected system - Google Patents

Double wind wheel double motor direct current series-parallel connection switching unified grid-connected system Download PDF

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Publication number
CN113937814B
CN113937814B CN202111248435.4A CN202111248435A CN113937814B CN 113937814 B CN113937814 B CN 113937814B CN 202111248435 A CN202111248435 A CN 202111248435A CN 113937814 B CN113937814 B CN 113937814B
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China
Prior art keywords
motor
wind wheel
rectifier
direct current
mechanical switch
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CN202111248435.4A
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CN113937814A (en
Inventor
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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Huaneng Clean Energy Research Institute
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Classifications

    • 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
    • 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
    • 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
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • 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
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • 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

Abstract

The application provides a direct current series-parallel switching unified grid-connected system with double wind wheels and double motors, which comprises the following components: the first wind wheel is connected with the first motor, and the second wind wheel is connected with the second motor; the first motor and the second motor are respectively connected with the input end of the converter, serial-parallel switching can be realized in 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 level of the system converter 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 converter system is unchanged, the number of the grid-side converters is reduced from two to one, the equipment weight and the cost are reduced, the system line loss is reduced, the system control complexity is reduced, and the grid-connected power generation efficiency of the system is improved.

Description

Double wind wheel double motor direct current series-parallel connection switching unified grid-connected system
Technical Field
The application relates to the technical field of wind power generation, in particular to a double-wind-wheel double-motor direct current series-parallel switching unified grid-connected system.
Background
In recent years, the utilization of renewable energy will dominate the power industry, and the proportion of non-hydraulic renewable energy to be generated will be doubled. Wind power generation is used as renewable energy power generation which is the most mature technology except hydroelectric power generation, the installed capacity of the renewable energy power generation is the vast majority of the total capacity of the whole renewable energy power generation installation, but the limitation of the performance of power electronic devices causes a certain bottleneck for the development and the application of a large-capacity wind turbine generator, and how to reasonably construct a grid-connected system becomes a problem to be solved in the industry.
Disclosure of Invention
The present application aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the first objective of the present application is to provide a dual wind wheel dual motor dc series-parallel switching unified grid-connected system, so as to improve the dc bus voltage level of the system converter system, or increase the output power of the system by collecting current on the basis of unchanged dc side voltage of the converter system, reduce the weight and cost of the device, 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 objective, an embodiment of a first aspect of the present application provides a dual wind wheel dual motor dc series-parallel switching unified grid-connected system, including: the system comprises a first fan, a second fan, a three-port converter and a grid-connected transformer, wherein the first fan comprises a first wind wheel and a first motor, the second fan comprises a second wind wheel and a second motor, and the three-port converter comprises a first rectifier, a second rectifier, an inverter and a mechanical switch; the first wind wheel is connected with the first motor, and the first motor is used for outputting a first alternating voltage signal U1 and a first alternating current signal I1 when the first wind wheel rotates; the second wind wheel is connected with the second motor, and the second motor is used for outputting a second alternating voltage signal U2 and a second alternating current signal I2 when the second wind wheel rotates; the first motor is connected with the input end of the first rectifier, the second motor is connected with the input end of 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 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, 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 input negative end of the inverter, the output end of the inverter is connected with the grid-connected transformer, the first free end of the mechanical switch is switched to connect the first parallel fixed end of the mechanical switch and the first fixed end of the mechanical switch, and the second parallel fixed end of the second free end of the mechanical switch is connected with the second series fixed end of the mechanical switch; the first rectifier 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 voltage 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 the second alternating current voltage signal U2 and generating a second direct current signal Id2 according to the second alternating current signal I2, the inverter is used for generating a third alternating current voltage signal U3 according to a direct current input voltage signal Ud3 of the inverter, generating a third alternating current signal I3 according to a direct current input current signal Id3 of the inverter, and inputting the third alternating current voltage signal U3 and the third alternating current signal I3 to the grid-connected transformer.
The double wind wheel double motor direct current series-parallel switching unified grid-connected system provided by the embodiment of the application, the first wind wheel is connected with the first motor, the first motor is used for outputting a first alternating voltage signal U1 and a first alternating current signal I1 when the first wind wheel rotates, the second wind wheel is connected with the second motor, the second motor is used for outputting a second alternating voltage signal U2 and a second alternating current signal I2 when the second wind wheel rotates, the first motor is connected with the input end of a first rectifier, the second motor is connected with 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 first free end of a 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, the first serial fixed end of the mechanical switch is connected with the second fixed end of the mechanical switch, the output negative end of the second rectifier is connected with the first direct current signal U1, the first parallel fixed end of the mechanical switch is connected with the second parallel fixed end of the mechanical switch is generated, the first direct current signal D is connected with the first direct current signal D1 of the mechanical switch, the first parallel fixed end of the mechanical switch is generated according to the first direct current signal D of the first direct current signal of the mechanical switch, the first parallel signal D is generated by the first direct current signal of the first parallel signal of the mechanical switch, the first direct current signal D1 is connected with the first direct current signal of the mechanical switch and the first direct current signal D1, the first direct current signal is used for generating the mechanical signal D is used for the mechanical voltage conversion, and generating a second direct current signal Id2 according to the second alternating current signal I2, wherein the inverter is used for generating a third alternating current voltage signal U3 according to a direct current input voltage signal Ud3 of the inverter, generating a third alternating current signal I3 according to the direct current input current signal Id3 of the inverter, and inputting the third alternating current voltage signal U3 and the third alternating current signal I3 to the grid-connected transformer. According to the double wind wheel double motor direct current series-parallel switching unified grid-connected system, the change-over switch is formed by two sets of mechanical selection switches, different functions of series boosting and parallel converging on the direct current side of the grid-connected system are realized through actions of the change-over switch according to requirements of the grid-connected system, the system can work in a direct current side series mode and a direct current side parallel mode according to different working states of the change-over switch, the voltage level of a direct current bus of the system converter system can be improved, or the output power of the system is increased through converging current on the basis that the direct current side voltage of the system converter system is unchanged, the number of grid-side converters is reduced from two, the weight and the cost of equipment are reduced, the line loss of the system are 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 and a second single pole double throw switch.
According to one embodiment of the application, the first electric machine is a permanent magnet synchronous generator.
According to one embodiment of the application, the second electric machine is a permanent magnet synchronous generator.
According to one embodiment of the application, the first electric machine is a single winding single rotor electric machine.
According to one embodiment of the application, the second motor is a single winding single rotor motor.
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 and/or the second wind wheel are three-bladed wind wheels.
Additional aspects and advantages of the 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 application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of a dual wind rotor dual motor DC series-parallel switching unified grid-connected system according to one embodiment of the present application;
fig. 2 is a schematic structural diagram of a mechanical switch according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
The following describes a double wind wheel double motor direct current series-parallel switching unified grid-connected system according to the embodiment of the application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a dual wind wheel dual motor dc series-parallel switching unified grid-connected system according to an embodiment of the present application, as shown in fig. 1, the dual wind wheel dual motor dc series-parallel switching unified grid-connected system according to the embodiment of the present application may specifically include: a first fan 101, a second fan 102, a three-port converter 103 and a grid-connected transformer 104, wherein:
the first fan 101 comprises a first wind wheel 1011 and a first motor 1012, the second fan 102 comprises a second wind wheel 1021 and a second motor 1022, and the three-port converter 103 comprises a first rectifier 1031, a second rectifier 1032, an inverter 1033 and a mechanical switch 1034. Wherein the mechanical switch 1034 may specifically comprise a first single pole double throw switch and a second single pole double throw switch forming two sets of mechanical selector switches. The first wind wheel 1011 and/or the second wind wheel 1021 may specifically be three-bladed wind wheels, i.e. any one of the first wind wheel 1011 and the second wind wheel 1021 may be a three-bladed wind wheel. The first electric machine 1012 may be embodied as a single-winding single-rotor electric machine and the second electric machine 1022 may be embodied as a single-winding single-rotor electric machine.
The first wind wheel 1011 is connected to a first motor 1012 (specifically, a rotor of the first motor 1012), and the first wind wheel 1011 rotates under the action of wind to drive the rotor of the first motor 1012 to rotate. The first motor 1012 is configured to output a first ac voltage signal U1 and a first ac current signal I1 when the first wind turbine 1011 rotates. The first motor 1012 may be a permanent magnet synchronous generator.
The second wind wheel 1021 is connected with a second motor 1022 (specifically, a rotor of the second motor 1022), and the second wind wheel 1021 rotates under the action of wind to drive the rotor of the second motor 1022 to rotate. The second motor 1022 is configured to output a second ac voltage signal U2 and a second ac current signal I2 when the second wind wheel 1021 rotates. The second electric machine 1022 may be a permanent magnet synchronous generator.
The first motor 1012 (specifically, the winding of the first motor 1012) is connected to the input end of the first rectifier 1031 through a three-phase line, the second motor 1022 (specifically, the winding of the second motor 1022) is connected to the input end of the second rectifier 1032 through a three-phase line, the output positive end of the first rectifier 1031 is connected to the input positive end of the inverter 1033 through a direct current bus, the output negative end of the first rectifier 1031 is connected to the first free end 201 (shown in fig. 2) of the mechanical switch 1034 through a direct current bus, the first parallel fixed end 202 (shown in fig. 2) of the mechanical switch 1034 is connected to the input negative end of the inverter 1033 through a direct current bus, the output positive end of the second rectifier 1032 is connected to the second free end 203 (shown in fig. 2) of the mechanical switch 1034 through a direct current bus, the second parallel fixed end 204 (shown in fig. 2) of the mechanical switch 1034 is connected to the input positive end of the inverter 1033 through a direct current bus, the first series fixed end 205 (shown in fig. 2) of the mechanical switch 1034 is connected to the output negative end of the inverter 1034 through a direct current bus, and the output end 104 of the inverter 1033 is connected to the three-phase transformer input end of the inverter 1033 through a direct current bus.
The first free end 201 (shown in fig. 2) of the mechanical switch 1034 is switchably connected to the first parallel fixed end 202 (shown in fig. 2) of the mechanical switch 1034 and the first serial fixed end 205 (shown in fig. 2) of the mechanical switch 1034, the second free end 203 (shown in fig. 2) of the mechanical switch 1034 is switchably connected to the second parallel fixed end 204 (shown in fig. 2) of the mechanical switch 1034 and the second serial fixed end 206 (shown in fig. 2) of the mechanical switch 1034, so that the system has two working states of parallel connection (state 1, i.e. the end point corresponding to 1 in fig. 1 is selected to be connected) and serial connection (state 2, i.e. the end point corresponding to 2 in fig. 1 is selected to be connected), and different functions of serial boosting and parallel confluence on the direct current side of the grid-connected system are realized through the action of the switch according to the requirements of the grid-connected system. The first rectifier 1031 may be a full-power rectifier, the second rectifier 1032 may be a full-power rectifier, and the inverter 1033 may be a full-power inverter.
The first rectifier 1031 is configured to generate a first direct current voltage signal Ud1 according to the first alternating current voltage signal U1, and generate a first direct current signal Id1 according to the first alternating current signal I1, where the output power of the first rectifier 1031 is P1, and the working efficiency is η 1 The following formula is satisfied:
the second rectifier 1032 is used for generating a second DC voltage signal Ud2 according to the second AC voltage signal U2 and generating a second AC current signal I2The DC current signal Id2, the output power of the second rectifier 1032 is P2, the working efficiency is eta 2 The following formula is satisfied:
the dc input voltage signal of the inverter 1033 is Ud3, the dc input current signal of the inverter 1033 is Id3,
when the mechanical switch is in state 2, the first rectifier 1031 and the second rectifier 1032 are connected in series on the dc side, satisfying the following formula:
Id3＝Id2＝Id1
when the mechanical switch is in state 1, the first rectifier 1031 and the second rectifier 1032 are connected in parallel on the dc side;
Ud3＝Ud2＝Ud1
the inverter 1033 is configured to generate a third ac voltage signal U3 according to the dc input voltage signal Ud3 of the inverter, generate a third ac current signal I3 according to the dc input current signal Id3 of the inverter, and input the third ac voltage signal U3 and the third ac current signal I3 to the grid-connected transformer 104. The operation efficiency of the inverter 1033 is η 3 The output power is P3, which satisfies the following formula:
the double wind wheel double motor direct current series-parallel switching unified grid-connected system provided by the embodiment of the application, the first wind wheel is connected with the first motor, the first motor is used for outputting a first alternating voltage signal U1 and a first alternating current signal I1 when the first wind wheel rotates, the second wind wheel is connected with the second motor, the second motor is used for outputting a second alternating voltage signal U2 and a second alternating current signal I2 when the second wind wheel rotates, the first motor is connected with the input end of a first rectifier, the second motor is connected with 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 first free end of a 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, the first serial fixed end of the mechanical switch is connected with the second fixed end of the mechanical switch, the output negative end of the second rectifier is connected with the first direct current signal U1, the first parallel fixed end of the mechanical switch is connected with the second parallel fixed end of the mechanical switch is generated, the first direct current signal D is connected with the first direct current signal D1 of the mechanical switch, the first parallel fixed end of the mechanical switch is generated according to the first direct current signal D of the first direct current signal of the mechanical switch, the first parallel signal D is generated by the first direct current signal of the first parallel signal of the mechanical switch, the first direct current signal D1 is connected with the first direct current signal of the mechanical switch and the first direct current signal D1, the first direct current signal is used for generating the mechanical signal D is used for the mechanical voltage conversion, and generating a second direct current signal Id2 according to the second alternating current signal I2, wherein the inverter is used for generating a third alternating current voltage signal U3 according to a direct current input voltage signal Ud3 of the inverter, generating a third alternating current signal I3 according to the direct current input current signal Id3 of the inverter, and inputting the third alternating current voltage signal U3 and the third alternating current signal I3 to the grid-connected transformer. According to the double wind wheel double motor direct current series-parallel switching unified grid-connected system, the change-over switch is formed by two sets of mechanical selection switches, different functions of series boosting and parallel converging on the direct current side of the grid-connected system are realized through actions of the change-over switch according to requirements of the grid-connected system, the system can work in a direct current side series mode and a direct current side parallel mode according to different working states of the change-over switch, the voltage level of a direct current bus of the system converter system can be improved, or the output power of the system is increased through converging current on the basis that the direct current side voltage of the system converter system is unchanged, the number of grid-side converters is reduced from two, the weight and the cost of equipment are reduced, the line loss of the system are 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 should 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", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," 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 present application. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (10)

1. The utility model provides a two wind wheel bi-motor direct current series-parallel switching unification grid-connected system which characterized in that includes: the system comprises a first fan, a second fan, a three-port converter and a grid-connected transformer, wherein the first fan comprises a first wind wheel and a first motor, the second fan comprises a second wind wheel and a second motor, and the three-port converter comprises a first rectifier, a second rectifier, an inverter and a mechanical switch;
the first wind wheel is connected with the first motor, and the first motor is used for outputting a first alternating voltage signal U1 and a first alternating current signal I1 when the first wind wheel rotates;
the second wind wheel is connected with the second motor, and the second motor is used for outputting a second alternating voltage signal U2 and a second alternating current signal I2 when the second wind wheel rotates;
the first motor is connected with the input end of the first rectifier, the second motor is connected with the input end of 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 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, 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 input negative end of the inverter, the output end of the inverter is connected with the grid-connected transformer, the first free end of the mechanical switch is switched to connect the first parallel fixed end of the mechanical switch and the first fixed end of the mechanical switch, and the second parallel fixed end of the second free end of the mechanical switch is connected with the second series fixed end of the mechanical switch;
the first rectifier is configured to generate a first direct current voltage signal Ud1 according to the first alternating current voltage signal U1, and generate a first direct current signal Id1 according to the first alternating 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 dc input voltage signal Ud3 of the inverter, generate a third ac current signal I3 according to the dc input current signal Id3 of the inverter, and input the third ac voltage signal U3 and the third ac current signal I3 to the grid-connected transformer.
2. The double wind wheel double motor direct current series-parallel switching unified grid connection system of claim 1, wherein the mechanical switch comprises a first single pole double throw switch and a second single pole double throw switch.
3. The dual wind wheel dual motor dc series-parallel switching unified grid-connected system of claim 1, wherein the first motor is a permanent magnet synchronous generator.
4. The double wind wheel double motor direct current series-parallel switching unified grid-connected system according to claim 1, wherein the second motor is a permanent magnet synchronous generator.
5. The dual wind rotor dual motor dc series-parallel switching unified grid-connected system of claim 1, wherein the first motor is a single winding single rotor motor.
6. The dual wind wheel dual motor dc series-parallel switching unified grid-connected system of claim 1, wherein the second motor is a single winding single rotor motor.
7. The dual wind wheel dual motor dc series-parallel switching unified grid-connected system of claim 1, wherein the first rectifier is a full power rectifier.
8. The dual wind wheel dual motor dc series-parallel switching unified grid-connected system of claim 1, wherein the second rectifier is a full power rectifier.
9. The dual wind wheel dual motor dc series-parallel switching unified grid-connected system of claim 1, wherein the inverter is a full power inverter.
10. The dual rotor dual motor dc series-parallel switching unified grid-connected system of claim 1, wherein the first rotor and/or the second rotor are three-bladed rotors.
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