CN114123301A - Series double-wind wheel single-motor direct-current series-parallel switching unified grid-connected system - Google Patents
Series double-wind wheel single-motor direct-current series-parallel switching unified grid-connected system Download PDFInfo
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- CN114123301A CN114123301A CN202111248441.XA CN202111248441A CN114123301A CN 114123301 A CN114123301 A CN 114123301A CN 202111248441 A CN202111248441 A CN 202111248441A CN 114123301 A CN114123301 A CN 114123301A
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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
Abstract
The application provides a two wind wheel single motor direct current of tandem series connection in series-parallel switch unifies and is incorporated into power networks system includes: 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, series-parallel connection switching can be achieved inside 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 grade of a system current transformation system can be improved, or the output power of the system is increased by collecting current on the basis that the direct current side voltage of the current transformation system is not changed, two grid-side converters are reduced into one, the weight and the cost of equipment are reduced, the line loss of the system is reduced, the control complexity of the system is reduced, and the grid-connected power generation efficiency of the system is improved.
Description
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 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 serial-parallel switching unified grid-connected system with two serial wind wheels and a single motor, so as to improve system output power, reduce equipment weight and cost, reduce system line loss, reduce system control complexity, and improve grid-connected power generation efficiency of the system.
In order to achieve the above object, an embodiment of the present application provides a dc serial-parallel switching unified grid-connected system with two wind turbines and a single motor in series, 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 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 respectively with the input of first rectifier with the input of second rectifier is connected, the positive end of output of first rectifier with the positive end of input of dc-to-ac converter is connected, the negative end of output of first rectifier with mechanical switch's first free end is connected, mechanical switch's first parallel stiff end with the negative end of input of dc-to-ac converter is connected, the positive end of output of second rectifier with mechanical switch's second free end is connected, mechanical switch's the parallel stiff end of second with the positive end of input of dc-to-ac converter is connected, mechanical switch's first series stiff end with mechanical switch's the second series stiff end is connected, the negative end of output of second rectifier with the negative end of input of dc-to-ac converter is connected, the output of dc-to-ac converter with the transformer that is incorporated into the power networks is connected, mechanical switch's first free end switching connection mechanical switch's the first parallel stiff end of mechanical switch with mechanical switch's first parallel stiff end of mechanical switch is incorporated into the power The second free end of the mechanical switch is connected with the second parallel fixed end of the mechanical switch and the second series fixed end of the mechanical switch in a switching mode; 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 the second alternating current 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 signal U3 according to the third direct current signal Ud3, generating a third alternating current signal I3 according to the third direct current signal Id3, and inputting the third alternating current signal U3 and the third alternating current signal I3 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 signal Ud2, the third dc current signal Id3 is obtained from the first dc current signal Id1 and/or the second dc current signal Id 2.
The first wind wheel and the 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 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 second parallel fixed end of the mechanical switch is connected with the input negative end of the inverter, a first series-fixed end of the mechanical switch is connected with a second series-fixed end of the mechanical switch, an output negative end of a second rectifier is connected with an input negative end of the inverter, an output end of the inverter is connected with the grid-connected transformer, a first free end of the mechanical switch is connected with a first parallel-fixed end of the mechanical switch and a first series-fixed end of the mechanical switch in a switching manner, a second free end of the mechanical switch is connected with a second parallel-fixed end of the mechanical switch and a second series-fixed end of the mechanical switch in a switching manner, the first rectifier is used for generating a first direct current voltage signal Ud1 according to a first alternating current 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 signal U2 and generating a second direct current signal Id2 according to a second alternating current signal I2, and the inverter is used for generating a third alternating current voltage signal U3 according to a third direct current voltage signal Ud3, generating a third alternating current signal I3 according to a third direct current signal Id3, and inputting the third alternating current voltage signal U3 and the third alternating current signal I3 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 tandem double-wind-wheel single-motor direct-current series-parallel switching unified grid-connected system provided by the embodiment of the application consists of two sets of mechanical selection switches, different functions of series boosting and parallel converging of the direct-current side of the grid-connected system are realized through the action of the switching system according to the requirement 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 switching switches, the direct-current bus voltage grade of a converter system of the system can be improved, or the output power of the system is increased by collecting current on the basis of unchanged direct-current side voltage of the converter system, two grid-side converters are reduced into one, the weight and the cost of equipment are reduced, the line loss of the system is reduced, the control complexity of the system is reduced, and the grid-connected generating 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 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 switching unified grid-connected system with direct current series-parallel connection of a single wind turbine in accordance with 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
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-parallel switching unified grid-connected system of a series-parallel switching system of a single wind turbine and a single direct current in accordance with an embodiment of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a series-parallel connection switching unified grid-connected system with single series-parallel connection of two wind turbines and single motor according to an embodiment of the present application, and as shown in fig. 1, the series-parallel connection switching unified grid-connected system with single series-parallel connection of two wind turbines and single motor 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 includes a first wind rotor 1011, a second wind rotor 1012, and a motor 1013, and the three-port converter 102 includes a first rectifier 1021, a second rectifier 1022, an inverter 1023, and a mechanical switch 1024. The mechanical switch 1024 may specifically include a first single-pole double-throw switch and a second single-pole double-throw switch forming two sets of mechanical selection switches. Specifically, first wind wheel 1011 and/or second wind wheel 1012 may be three-bladed wind wheels, that is, any one of first wind wheel 1011 and second wind wheel 1012 may be three-bladed wind wheels. The motor 1013 may be specifically 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 motor 1013 (specifically, the first stator winding of the motor 1013) is connected to the input terminal of the first rectifier 1021 through a three-phase line, the motor 1013 (specifically, the second stator winding of the motor 1013) is connected to the input terminal of the second rectifier 1022 through a three-phase line, the positive output terminal of the first rectifier 1021 is connected to the positive input terminal of the inverter 1023, the negative output terminal of the first rectifier 1021 is connected to the first free terminal 201 (as shown in fig. 2) of the mechanical switch 1024 through a dc bus, the first parallel fixed terminal 202 (as shown in fig. 2) of the mechanical switch 1024 is connected to the negative input terminal of the inverter 1023 through a dc bus, the positive output terminal of the second rectifier is connected to the second free terminal 203 (as shown in fig. 2) of the mechanical switch 1024 through a dc bus, the second parallel fixed terminal 204 (as shown in fig. 2) of the mechanical switch 1024 is connected to the positive input terminal of the inverter 1023 through a dc bus, the first series fixed end 205 (shown in fig. 2) of the mechanical switch 1024 is connected to the second series fixed end 206 (shown in fig. 2) of the mechanical switch 1024 through a dc bus, the output negative end of the second rectifier 1022 is connected to the input negative end of the inverter 1023 through a dc bus, and the output end of the inverter 1023 is connected to the grid-connected transformer 103 through a three-phase line. The first free end 201 (shown in fig. 2) of the mechanical switch 1024 is connected to the first parallel fixed end 202 (shown in fig. 2) of the mechanical switch 1024 and the first series fixed end 205 (shown in fig. 2) of the mechanical switch 1024 in a switchable manner, and the second free end 203 (shown in fig. 2) of the mechanical switch 1024 is connected to the second parallel fixed end 204 (shown in fig. 2) of the mechanical switch 1024 and the second series fixed end 206 (shown in fig. 2) of the mechanical switch 1024 in a switchable manner, so that the system shares two working states, namely, a parallel connection state 1 (in which the end point corresponding to 1 in fig. 1 is selectively connected) and a series connection state 2 (in which the end point corresponding to 2 in fig. 1 is selectively connected), and different functions of series voltage boosting and parallel current converging on the dc side of the grid-connected system are realized by the action of the switch according to the requirements of the grid-connected system. The first rectifier 1021 may be a full power rectifier, the second rectifier 1022 may be a full power rectifier, 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 I1, the output power of the first rectifier 1021 is P1, and the work efficiency is eta1And then:
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:
the first rectifier 1021 and the second rectifier 1022 are connected on the dc side, and further connected to the dc input terminal of the inverter 1023, and the dc side of the inverter 1023 inputs the third dc voltage signal Ud3 and the third dc current signal Id3, wherein the mechanical switch can realize 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 operation 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 formulas:
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 current signal Id3, and the inverter 1023 inputs the third ac voltage signal U3 and the third ac current signal I3 to the grid-connected transformer 103. Optionally, the inverter 1023 has an operating efficiency η3And the output power is P3, then:
the first wind wheel and the 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 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 second parallel fixed end of the mechanical switch is connected with the input negative end of the inverter, a first series-fixed end of the mechanical switch is connected with a second series-fixed end of the mechanical switch, an output negative end of a second rectifier is connected with an input negative end of the inverter, an output end of the inverter is connected with the grid-connected transformer, a first free end of the mechanical switch is connected with a first parallel-fixed end of the mechanical switch and a first series-fixed end of the mechanical switch in a switching manner, a second free end of the mechanical switch is connected with a second parallel-fixed end of the mechanical switch and a second series-fixed end of the mechanical switch in a switching manner, the first rectifier is used for generating a first direct current voltage signal Ud1 according to a first alternating current 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 signal Ud2 according to the second alternating current 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 signal U3 according to the third direct current signal Ud3, and generating a third alternating current signal I3 according to a third direct current signal Id3, and inputting a third alternating current signal U3 and a third alternating current signal I3 to the grid-connected transformer, wherein the third direct current signal Ud3 is obtained according to the first direct current signal Ud1 and/or 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. The tandem double-wind-wheel single-motor direct-current series-parallel switching unified grid-connected system provided by the embodiment of the application comprises two sets of mechanical selector switches which form a change-over switch, different functions of series boosting and parallel converging of the direct-current side of the grid-connected system are realized through the action of the change-over switch according to the requirement 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 direct-current bus voltage grade of a converter system of the system can be improved, or the output power of the system is increased through collecting current on the basis that the direct-current side voltage of the converter system is not changed, two grid-side converters are reduced into one, the weight and the cost of equipment are reduced, the line loss of the system is reduced, the control complexity of the system is reduced, and the grid-connected power generation efficiency of the system is improved.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (9)
1. The utility model provides a two wind wheel list motor direct current series-parallel connection switch unification grid-connected 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, an inverter and a mechanical switch;
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 respectively with the input of first rectifier with the input of second rectifier is connected, the positive end of output of first rectifier with the positive end of input of dc-to-ac converter is connected, the negative end of output of first rectifier with mechanical switch's first free end is connected, mechanical switch's first parallel stiff end with the negative end of input of dc-to-ac converter is connected, the positive end of output of second rectifier with mechanical switch's second free end is connected, mechanical switch's the parallel stiff end of second with the positive end of input of dc-to-ac converter is connected, mechanical switch's first series stiff end with mechanical switch's the second series stiff end is connected, the negative end of output of second rectifier with the negative end of input of dc-to-ac converter is connected, the output of dc-to-ac converter with the transformer that is incorporated into the power networks is connected, mechanical switch's first free end switching connection mechanical switch's the first parallel stiff end of mechanical switch with mechanical switch's first parallel stiff end of mechanical switch is incorporated into the power The second free end of the mechanical switch is connected with the second parallel fixed end of the mechanical switch and the second series fixed end of the mechanical switch in a switching mode;
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 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 voltage signal U3 according to a third direct current voltage signal Ud3, generating a third alternating current signal I3 according to a third direct current signal Id3, and inputting the third alternating current voltage signal U3 and the third alternating current signal I3 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.
2. The tandem double wind wheel single motor direct current series-parallel switching unified grid-connected system according to claim 1, wherein the mechanical switch comprises a first single-pole double-throw switch and a second single-pole double-throw switch.
3. The series double wind wheel single motor direct current series-parallel switching unified grid-connected system according to claim 1, characterized in that the motor is a permanent magnet synchronous generator.
4. The series double wind wheel single motor direct current series-parallel switching unified grid-connected system according to claim 1, characterized in that the motor is a double-winding double-rotor motor.
5. The series double wind wheel single motor direct current series-parallel switching unified grid-connected system according to 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 according to 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 according to claim 1, characterized in that the inverter is a full power inverter.
8. The series double-wind-wheel single-motor direct-current series-parallel switching unified grid-connected system according to claim 1, wherein the first wind wheel is a three-blade wind wheel.
9. The series double-wind-wheel single-motor direct-current series-parallel switching unified grid-connected system according to claim 1, wherein the second wind wheel is a three-blade wind wheel.
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