CN114123301B - Direct current series-parallel switching unified grid-connected system with serial double wind wheels and single motor - Google Patents
Direct current series-parallel switching unified grid-connected system with serial double wind wheels and single motor Download PDFInfo
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- CN114123301B CN114123301B CN202111248441.XA CN202111248441A CN114123301B CN 114123301 B CN114123301 B CN 114123301B CN 202111248441 A CN202111248441 A CN 202111248441A CN 114123301 B CN114123301 B CN 114123301B
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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
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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
- H02J3/46—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
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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
- 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
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Abstract
The application provides a direct current series-parallel switching unified grid-connected system with a serial double wind wheel and a single motor, which comprises the following components: the first wind wheel and the second wind wheel are respectively connected with a motor, the motor is connected with the input end of a converter, serial-parallel switching can be realized in the converter through a mechanical switch, and the output end of the converter is connected with a 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
Technical Field
The application relates to the technical field of wind power generation, in particular to a serial double-wind-wheel single-motor direct current serial-parallel switching unified grid-connected system.
Background
In recent years, the annual growth rate of the global renewable energy source is 25%, the utilization of renewable energy sources is dominant in the power industry, and the power generation proportion of non-hydraulic renewable energy sources is 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 installed machine, 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 purpose of the application is to provide a series double wind wheel single motor direct current series-parallel switching unified grid-connected system, so as to improve the output power of the system, reduce the equipment weight and the cost, 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 serial double wind wheel single motor dc series-parallel switching 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, an inverter and a mechanical switch; the first wind wheel and the second wind wheel are respectively connected with the motor, and the motor is used for outputting a first alternating voltage signal U1 and a first alternating current signal I1 when the first wind wheel rotates and outputting a second alternating 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 the first rectifier and 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 serial fixed end of the mechanical switch is connected with the second serial fixed end of the mechanical switch, the output negative end of the second rectifier is connected with the 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 and connected with the first parallel fixed end of the mechanical switch, and the second free end of the mechanical switch is switched with the second serial 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 voltage signal I2, the inverter is used for generating a third alternating current voltage signal U3 according to a third direct current voltage signal Ud3 and generating a third alternating current signal I3 according to a third direct current signal Id3, and the third alternating current voltage signal U3 and the third alternating current signal I3 are input to the grid-connected transformer, wherein the third direct current voltage signal Ud3 is obtained according to the first direct current voltage signal Ud1 and/or the second direct current voltage 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.
The embodiment of the application provides a serial double wind wheel single motor direct current serial-parallel switching unified grid-connected system, a first wind wheel and a second wind wheel are respectively connected with a motor, the motor is used for outputting a first alternating voltage signal U1 and a first alternating current signal I1 when the first wind wheel rotates and outputting a second alternating voltage signal U2 and a second alternating current signal I2 when the second wind wheel rotates, the motor is respectively connected with an input end of a first rectifier and an input end of a second rectifier, an output positive end of the first rectifier is connected with an input positive end of an inverter, an output negative end of the first rectifier is connected with a first free end of a mechanical switch, a first parallel fixed end of the mechanical switch is connected with an input negative end of the inverter, an output positive end of the second rectifier is connected with a second free end of the mechanical switch, a second parallel fixed end of the mechanical switch is connected with an input positive end of the inverter, the first serial fixed end of the mechanical switch is connected with the second serial fixed end of the mechanical switch, the output negative end of the second rectifier is connected with the 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 and connected with the first parallel fixed end of the mechanical switch and the first serial fixed end of the mechanical switch, the second free end of the mechanical switch is switched and connected with the second parallel fixed end of the mechanical switch and the second serial fixed end of the mechanical switch, the first rectifier is used for generating a first direct current voltage signal Ud1 according to a first alternating current voltage signal U1 and generating a first direct current signal Id1 according to a 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 voltage signal U2 and generating a second direct current signal Id2 according to a second alternating current signal I2, the inverter is configured to generate a third ac voltage signal U3 according to a third dc voltage signal Ud3, 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 the grid-connected transformer, wherein the third dc voltage signal Ud3 is obtained according to the first dc voltage signal Ud1 and/or the second dc voltage signal Ud2, and the third dc current signal Id3 is obtained according to the first dc voltage signal Id1 and/or the second dc current signal Id 2. The serial double wind wheel single motor direct current serial parallel switching unified grid-connected system provided by the embodiment of the application consists of two sets of mechanical selection switches, different functions of serial boosting and parallel converging on the direct current side of the grid-connected system are realized through the action of a switching system according to the requirements of the grid-connected system, the system can work in a direct current side serial mode and a direct current side parallel mode according to different working states of the switching 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 of unchanged direct current side voltage of the system converter system, the grid-side converter 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.
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 electric machine is a permanent magnet synchronous generator.
According to one embodiment of the application, the motor is a double-winding double-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 one embodiment of the application, the first wind wheel is a three-bladed wind wheel.
According to one embodiment of the application, the second wind wheel is a three-bladed wind wheel.
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 serial double wind wheel single motor dc series-parallel switching unified grid-connected system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a mechanical switch according to an embodiment of the present application.
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 serial double wind wheel single motor direct current serial 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 serial double wind wheel single motor direct current series-parallel connection switching unified grid-connected system according to an embodiment of the present application, as shown in fig. 1, the serial double wind wheel single motor direct current series-parallel connection switching unified grid-connected system according to the embodiment of the present application may specifically include: fan 101, three-port current transformer 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, an inverter 1023 and a mechanical switch 1024. The mechanical switch 1024 may include, among other things, a first single pole double throw switch and a second single pole double throw switch that form two sets of mechanical selector switches. The first wind wheel 1011 and/or the second wind wheel 1012 may specifically be three-bladed wind wheels, i.e. any one of the first wind wheel 1011 and the second wind wheel 1012 may be three-bladed wind wheels. The motor 1013 may be a dual-winding dual-rotor motor, and may include 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.
The first wind wheel 1011 and the second wind wheel 1012 are respectively connected with a motor 1013 (specifically, the first wind wheel 1011 may be a first rotor of the motor 1013, the wind wheel 1012 is connected with a second rotor of the motor 1013), the first wind wheel 1011 rotates under the action of wind to drive the first rotor of the motor 1013 to rotate, and the motor 1013, specifically, a first stator winding of the motor 1013, is used for outputting a first ac voltage signal U1 and a first ac current signal I1 when the first wind wheel 1011 drives the first rotor of the 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. Wherein the motor 1013 may be a permanent magnet synchronous generator.
The motor 1013 (specifically, the first stator winding of the motor 1013) is connected to the input end of the first rectifier 1021 through a three-phase line, while the motor 1013 (specifically, the second stator winding of the motor 1013) is connected to the input end of the second rectifier 1022 through a three-phase line, the output positive end of the first rectifier 1021 is connected to the input positive end of the inverter 1023, the output negative end of the first rectifier 1021 is connected to the first free end 201 (shown in fig. 2) of the mechanical switch 1024 through a direct current bus, the first parallel fixed end 202 (shown in fig. 2) of the mechanical switch 1024 is connected to the input negative end of the inverter 1023 through a direct current bus, the output positive end of the second rectifier 1022 is connected to the second free end 203 (shown in fig. 2) of the mechanical switch 1024 through a direct current bus, the second parallel fixed end 204 (shown in fig. 2) of the mechanical switch 1024 is connected to the input positive end of the inverter 1023 through a direct current bus, the first series fixed end 205 (shown in fig. 2) of the mechanical switch 1024 is connected to the second fixed end 206 (shown in fig. 2) of the mechanical switch 1024 through a direct current bus, the output positive end of the second rectifier 1022 is connected to the output negative end of the inverter 1023 through a direct current bus, and the output of the inverter 1023 is connected to the input end of the inverter 1023 through a grid-connected to the input end of the inverter 1023. The first free end 201 (shown in fig. 2) of the mechanical switch 1024 is switchably connected with the first parallel fixed end 202 (shown in fig. 2) of the mechanical switch 1024 and the first serial fixed end 205 (shown in fig. 2) of the mechanical switch 1024, the second free end 203 (shown in fig. 2) of the mechanical switch 1024 is switchably connected with the second parallel fixed end 204 (shown in fig. 2) of the mechanical switch 1024 and the second serial fixed end 206 (shown in fig. 2) of the mechanical switch 1024, 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 of 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 1021 may be a full-power rectifier, and 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 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 first rectifier 1021 outputs power P1 with working efficiency η 1 Then:
the second rectifier 1022 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, where the second rectifier 1022 outputs power P2 with working efficiency η 2 Then:
the first rectifier 1021 and the second rectifier 1022 are connected on the dc side and then connected to the dc input terminal of the inverter 1023, and the third dc voltage signal Ud3 and the third dc current signal Id3 are input to the dc side of the inverter 1023, where the mechanical switch can implement the following two working states by switching:
when the mechanical switch is in the first operating state, the first rectifier 1021 and the second rectifier 1022 are connected in series on the dc side, and the third dc voltage signal Ud3 and the third dc current signal Id3 can be obtained based on the following formula:
Id3＝Id2＝Id1
when the mechanical switch is in the second operating state, the first rectifier 1021 and the second rectifier 1022 are connected in parallel on the dc side, and the third dc voltage signal Ud3 and the third dc current signal Id3 can be obtained based on the following formula:
Ud3＝Ud2＝Ud1
the inverter 1023 is configured to generate a third ac voltage signal U3 according to the third dc voltage signal Ud3, generate a third ac current signal I3 according to the third dc voltage signal Id3, and invertThe inverter 1023 inputs the third ac voltage signal U3 and the third ac current signal I3 to the grid-connected transformer 103. Alternatively, inverter 1023 has an operating efficiency η 3 The output power is P3, then:
the embodiment of the application provides a serial double wind wheel single motor direct current serial-parallel switching unified grid-connected system, a first wind wheel and a second wind wheel are respectively connected with a motor, the motor is used for outputting a first alternating voltage signal U1 and a first alternating current signal I1 when the first wind wheel rotates and outputting a second alternating voltage signal U2 and a second alternating current signal I2 when the second wind wheel rotates, the motor is respectively connected with an input end of a first rectifier and an input end of a second rectifier, an output positive end of the first rectifier is connected with an input positive end of an inverter, an output negative end of the first rectifier is connected with a first free end of a mechanical switch, a first parallel fixed end of the mechanical switch is connected with an input negative end of the inverter, an output positive end of the second rectifier is connected with a second free end of the mechanical switch, a second parallel fixed end of the mechanical switch is connected with an 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 and connected with the first parallel fixed end of the mechanical switch and the first series fixed end of the mechanical switch, the second free end of the mechanical switch is switched and connected with the second parallel fixed end of the mechanical switch and 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 a first alternating current voltage signal U1 and generating a first direct current signal Id1 according to a first alternating current voltage signal I1, the second rectifier is used for generating a second direct current voltage signal Ud2 according to a second alternating current voltage signal U2 and generating a second direct current signal Id2 according to a second alternating current signal I2, the inverter is configured to generate a third ac voltage signal U3 according to a third dc voltage signal Ud3, 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 the grid-connected transformer, wherein the third dc voltage signal Ud3 is obtained according to the first dc voltage signal Ud1 and/or the second dc voltage signal Ud2, and the third dc current signal Id3 is obtained according to the first dc voltage signal Id1 and/or the second dc current signal Id 2. According to the serial double wind wheel single motor direct current serial-parallel switching unified grid-connected system, the change-over switch is formed by two sets of mechanical selection switches, different functions of serial 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 serial 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 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 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 (9)
1. The utility model provides a unified grid-connected system of serial double wind wheel single motor direct current serial-parallel connection switching 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, an inverter and a mechanical switch;
the first wind wheel and the second wind wheel are respectively connected with the motor, and the motor is used for outputting a first alternating voltage signal U1 and a first alternating current signal I1 when the first wind wheel rotates and outputting a second alternating 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 the first rectifier and 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 serial fixed end of the mechanical switch is connected with the second serial fixed end of the mechanical switch, the output negative end of the second rectifier is connected with the 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 and connected with the first parallel fixed end of the mechanical switch, and the second free end of the mechanical switch is switched with the second serial 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 a third dc voltage signal Ud3, 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 the grid-connected transformer, where the third dc voltage signal Ud3 is obtained according to the first dc voltage signal Ud1 and/or the second dc voltage signal Ud2, and the third dc current signal Id3 is obtained according to the first dc voltage signal Id1 and/or the second dc current signal Id 2.
2. The tandem double wind wheel single motor direct current series-parallel switching unified grid-connected 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 tandem double wind wheel single motor direct current series-parallel switching unified grid-connected system of claim 1, wherein the motors are permanent magnet synchronous generators.
4. The tandem double wind wheel single motor direct current series-parallel switching unified grid-connected system of claim 1, wherein the motor is a double winding double rotor motor.
5. The tandem double wind wheel single motor direct current series-parallel switching unified grid-connected system of claim 1, wherein the first rectifier is a full power rectifier.
6. The series double wind wheel single motor direct current series-parallel switching unified grid-connected system of claim 1, wherein the second rectifier is a full power rectifier.
7. The series double wind wheel single motor direct current series-parallel switching unified grid-connected system of claim 1, wherein the inverter is a full power inverter.
8. The series double wind wheel single motor direct current series-parallel switching unified grid-connected system of claim 1, wherein the first wind wheel is a three-bladed wind wheel.
9. The series double wind wheel single motor direct current series-parallel switching unified grid-connected system of claim 1, wherein the second wind wheel is a three-blade wind wheel.
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