CN114123304B - Four-input single-output direct current series-parallel grid-connected switching system for wind power generation - Google Patents
Four-input single-output direct current series-parallel grid-connected switching system for wind power generation Download PDFInfo
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- CN114123304B CN114123304B CN202111250375.XA CN202111250375A CN114123304B CN 114123304 B CN114123304 B CN 114123304B CN 202111250375 A CN202111250375 A CN 202111250375A CN 114123304 B CN114123304 B CN 114123304B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The application provides a four-input single-output direct current series-parallel grid-connected switching system for wind power generation, which comprises the following components: the wind wheel is connected with a motor corresponding to the wind wheel, the wind turbine generator is 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 inverters is reduced from four 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 four-input single-output direct current series-parallel grid-connected switching system for wind power generation.
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, a first object of the present application is to provide a four-input single-output dc series-parallel grid-connected switching system for wind power generation, so as to improve the output power of the system, reduce the equipment weight and 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 four-input single-output dc series-parallel grid-connected switching system for wind power generation, including: the wind turbine comprises a wind wheel and a motor corresponding to the wind wheel, wherein the five-input-port converter comprises a first rectifier, a second rectifier, a third rectifier, a fourth rectifier, an inverter and a mechanical switch; the wind wheel and the motor corresponding to the wind wheel are connected, a first output end of the wind turbine is connected with an input end of the first rectifier, a second output end of the wind turbine is connected with an input end of the second rectifier, a third output end of the wind turbine is connected with an input end of the third rectifier, a fourth output end of the wind turbine is connected with an input end of the fourth rectifier, an output positive end of the first rectifier is connected with an input positive end of the inverter, an output negative end of the first rectifier is connected with a first free end of the 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, 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 the second rectifier is connected with a third free end of the mechanical switch, a fourth free end of the mechanical switch is connected with a fourth free end of the mechanical switch in parallel, a third parallel fixed end of the mechanical switch is connected with a fourth free end of the mechanical switch is connected with a fifth free end of the mechanical switch in parallel, a third free end of the mechanical switch is connected with a fourth free end of the mechanical switch is connected with a fifth free end of the output of the mechanical switch in parallel, the sixth parallel fixed end of the mechanical switch is connected with the input positive end of the inverter, the fifth serial fixed end of the mechanical switch is connected with the sixth serial fixed end of the mechanical switch, the output negative end of the fourth 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 third free end of the mechanical switch is switched and connected with the third parallel fixed end of the mechanical switch and the third serial fixed end of the mechanical switch, the fourth free end of the mechanical switch is switched and connected with the fourth parallel fixed end of the mechanical switch and the fourth serial fixed end of the mechanical switch, the fifth free end of the mechanical switch is switched and connected with the fifth parallel fixed end of the mechanical switch and the sixth serial fixed end of the mechanical switch.
The four-input single-output direct current series-parallel grid-connected switching system for wind power generation provided by the embodiment of the application is characterized in that a wind wheel is connected with a motor corresponding to the wind wheel, a first output end of the wind turbine is connected with an input end of a first rectifier, a second output end of the wind turbine is connected with an input end of a second rectifier, a third output end of the wind turbine is connected with an input end of a third rectifier, a fourth output end of the wind turbine is connected with an input end of a fourth 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 the mechanical switch, a first parallel fixed end of the mechanical switch is connected with an input negative end of the inverter, a second parallel fixed end of the mechanical switch is connected with an input positive end of the inverter, a first serial fixed end of the mechanical switch is connected with a second serial fixed end of the mechanical switch, an output negative end of the second rectifier is connected with a third free end of the mechanical switch, a third parallel fixed end of the mechanical switch is connected with an output positive end of the fourth rectifier is connected with an output positive end of the mechanical switch of the fourth rectifier in parallel, a fourth parallel connection of the mechanical switch is connected with a fourth free end of the mechanical switch is connected with an output of the fourth rectifier in parallel, a fifth free end of the mechanical switch is connected with the output of the fourth rectifier is connected with the fourth free end of the mechanical switch in parallel, the fifth serial connection fixed end of the mechanical switch is connected with the sixth serial connection fixed end of the mechanical switch, the output negative end of the fourth 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 connection fixed end of the mechanical switch and the first serial connection fixed end of the mechanical switch, the second free end of the mechanical switch is switched and connected with the second parallel connection fixed end of the mechanical switch and the second serial connection fixed end of the mechanical switch, the third free end of the mechanical switch is switched and connected with the third parallel connection fixed end of the mechanical switch and the third serial connection fixed end of the mechanical switch, the fourth free end of the mechanical switch is switched and connected with the fifth parallel connection fixed end of the mechanical switch and the fifth serial connection fixed end of the mechanical switch, and the sixth free end of the mechanical switch is switched and connected with the sixth parallel connection fixed end of the mechanical switch. According to the four-input single-output direct current series-parallel grid-connected switching system for wind power generation, provided by the embodiment of the application, the six sets of mechanical selection switches form the switching switch, different functions of series boosting and parallel converging on the direct current side of the grid-connected system are realized through the action of the switching switch according to the 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 switching switch, the voltage level of a direct current bus of a 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 converter system, the number of grid-side inverters is reduced from four to 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.
According to one embodiment of the application, the mechanical switch includes a first single pole double throw switch, a second single pole double throw switch, a third single pole double throw switch, a fourth single pole double throw switch, a fifth single pole double throw switch, and a sixth single pole double throw switch.
According to one embodiment of the application, the wind turbine comprises a first fan and a second fan; the first fan comprises a first wind wheel and a first motor connected with the first wind wheel, a first output end of the first motor is used as a first output end of the wind turbine generator, and a second output end of the first motor is used as a second output end of the wind turbine generator; the second fan comprises a second wind wheel and a second motor connected with the second wind wheel, a first output end of the second motor is used as a third output end of the wind turbine generator, and a second output end of the second motor is used as a fourth output end of the wind turbine generator.
According to one embodiment of the application, the first and second electric machines are double winding single rotor electric machines.
According to one embodiment of the application, the first rectifier, the second rectifier, the third rectifier and the fourth rectifier are full power rectifiers and the inverter is a full power inverter.
According to one embodiment of the application, the motor is a permanent magnet synchronous generator and the rotor is a three-bladed rotor.
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 diagram of a four-input single-output DC series-parallel grid-connected switching system for wind power generation according to one embodiment of the present application;
FIG. 2 is a schematic diagram of a mechanical switch according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a wind turbine generator in a four-input single-output dc series-parallel grid-connected switching system for wind power generation 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 four-input single-output direct current series-parallel grid-connected switching system for wind power generation in the embodiment of the application is described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a four-input single-output dc series-parallel grid-connected switching system for wind power generation according to an embodiment of the present application, as shown in fig. 1, the four-input single-output dc series-parallel grid-connected switching system for wind power generation according to the embodiment of the present application may specifically include: wind turbine 101, five-port converter 102 and grid-connected transformer 103, wherein:
the wind turbine 101 includes a wind turbine 1011 and a motor 1012 corresponding to the wind turbine 1011, and the five-port converter 102 includes a first rectifier 1021, a second rectifier 1022, a third rectifier 1023, a fourth rectifier 1024, an inverter 1025, and a mechanical switch 1026.
The wind wheel 1011 is connected with a motor 1012 corresponding to the wind wheel, and the wind turbine 101 is configured to output a first ac voltage signal U1 and a first ac current signal I1 through a first output terminal, output a second ac voltage signal U2 and a second ac current signal I2 through a second output terminal, output a third ac voltage signal U3 and a third ac current signal I3 through a third output terminal, and output a fourth ac voltage signal U4 and a fourth ac current signal I4 through a fourth output terminal. Wherein, the motor 1012 may be a permanent magnet synchronous generator, and the wind wheel 1011 may be a three-blade wind wheel.
A first output end of the wind turbine 101 is connected with an input end of a first rectifier 1021 through a three-phase line, a second output end of the wind turbine 101 is connected with an input end of a second rectifier 1022 through a three-phase line, a third output end of the wind turbine 101 is connected with an input end of a third rectifier 1023 through a three-phase line, a fourth output end of the wind turbine 101 is connected with an input end of a fourth rectifier 1024 through a three-phase line, an output positive end of the first rectifier 1021 is connected with an input positive end of an inverter 1025 through a direct current bus, an output negative end of the first rectifier 1021 is connected with a first free end 201 (shown in figure 2) of a mechanical switch 1026 through a direct current bus, a first parallel fixed end 202 (shown in figure 2) of the mechanical switch 1026 is connected with an input negative end of the inverter 1025 through a direct current bus, the output positive terminal of the second rectifier 1022 is connected to the second free terminal 203 (shown in fig. 2) of the mechanical switch 1026 through a dc bus, the second parallel fixed terminal 204 (shown in fig. 2) of the mechanical switch 1026 is connected to the input positive terminal of the inverter 1024 through a dc bus, the first series fixed terminal 205 (shown in fig. 2) of the mechanical switch 1026 is connected to the second series fixed terminal 206 (shown in fig. 2) of the mechanical switch 1026 through a dc bus, the output negative terminal of the second rectifier 1022 is connected to the third free terminal 207 (shown in fig. 2) of the mechanical switch 1026 through a dc bus, the third parallel fixed terminal 208 (shown in fig. 2) of the mechanical switch 1026 is connected to the input negative terminal of the inverter 1025 through a dc bus, the output positive terminal of the third rectifier 1023 is connected to the fourth free terminal 209 (shown in fig. 2) of the mechanical switch 1026 through a dc bus, the fourth parallel fixed end 210 (shown in fig. 2) of the mechanical switch 1026 is connected to the input positive end of the inverter 1025 through a dc bus, the third serial fixed end 211 (shown in fig. 2) of the mechanical switch 1026 is connected to the fourth serial fixed end 212 (shown in fig. 2) of the mechanical switch 1026 through a dc bus, the output negative end of the third rectifier 1023 is connected to the fifth free end 213 of the mechanical switch 1026 through a dc bus, the fifth parallel fixed end 214 of the mechanical switch 1026 is connected to the input negative end of the inverter 1025 through a dc bus, the output positive end of the fourth rectifier 1024 is connected to the sixth free end 215 of the mechanical switch 1026 through a dc bus, the sixth parallel fixed end 216 of the mechanical switch 1026 is connected to the input positive end of the inverter 1025 through a dc bus, the fifth serial fixed end 217 of the mechanical switch 1026 is connected to the sixth serial fixed end 218 of the mechanical switch 1026, and the output negative end of the fourth rectifier 1024 is connected to the input negative end of the inverter 1025 through a dc bus, and the output end of the inverter 1205 is connected to the grid-tie-connected transformer 103.
A first free end 201 (shown in fig. 2) of the mechanical switch 1026 is switchably connected to a first parallel fixed end 202 (shown in fig. 2) of the mechanical switch 1026 and a first series fixed end 205 (shown in fig. 2) of the mechanical switch 1026, a second free end 203 (shown in fig. 2) of the mechanical switch 1026 is switchably connected to a second parallel fixed end 204 (shown in fig. 2) of the mechanical switch 1026 and a second series fixed end 206 (shown in fig. 2) of the mechanical switch 1026, a third free end 207 (shown in fig. 2) of the mechanical switch 1026 is switchably connected to a third parallel fixed end 208 (shown in fig. 2) of the mechanical switch 1026 and a third series fixed end 211 (shown in fig. 2) of the mechanical switch 1026, the fourth free end 209 (shown in fig. 2) of the mechanical switch 1026 is switchably connected to the fourth parallel fixed end 210 (shown in fig. 2) of the mechanical switch 1026 and the fourth series fixed end 212 (shown in fig. 2) of the mechanical switch 1026, the fifth free end 213 (shown in fig. 2) of the mechanical switch 1026 is switchably connected to the fifth parallel fixed end 214 (shown in fig. 2) of the mechanical switch 1026 and the fifth series fixed end 217 (shown in fig. 2) of the mechanical switch 1026, the sixth free end 215 (shown in fig. 2) of the mechanical switch 1026 is switchably connected to the sixth parallel fixed end 216 (shown in fig. 2) of the mechanical switch 1026 and the sixth series fixed end 218 (shown in fig. 2) of the mechanical switch 1026, so that the systems share the parallel connection (state 1, i.e. the end points corresponding to 1 in fig. 1 are selectively connected) and the series connection (state 2), the end points corresponding to the end points 2 in fig. 1 are selected to be connected), and different functions of series boosting and parallel converging on the direct current side of the grid-connected system are realized through the action of a change-over 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, the third rectifier 1023 may be a full-power rectifier, the fourth rectifier 1024 may be a full-power rectifier, and the inverter 1025 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 third rectifier 1023 is used for generating a third DC voltage signal Ud3 according to the third AC voltage signal U3 and according toThe third alternating current signal I3 generates a third direct current signal Id3, the output power of the third rectifier 1023 is P3, and the working efficiency is eta 3 Then:
the fourth rectifier 1024 is configured to generate a fourth dc voltage signal Ud4 according to the fourth ac voltage signal U4 and generate a fourth dc current signal Id4 according to the fourth ac current signal I4, the fourth rectifier 1024 outputs power P4 with working efficiency η 4 Then:
the first rectifier 1021, the second rectifier 1022, the third rectifier 1023 and the fourth rectifier 1024 are connected on the dc side and then connected to the dc input of the inverter 1025, and the dc side of the inverter 1025 inputs the fifth dc voltage signal Ud5 and the fifth dc current signal Id5, 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, the second rectifier 1022, the third rectifier 1023, and the fourth rectifier 1024 are connected in series on the dc side, and the fifth dc voltage signal Ud5 and the fifth dc current signal Id5 can be obtained based on the following formula:
Id5＝Id4＝Id3＝Id2＝Id1
when the mechanical switch is in the second operating state, the first rectifier 1021, the second rectifier 1022, the third rectifier 1023 and the fourth rectifier 1024 are connected in parallel on the dc side, and the fifth dc voltage signal Ud5 and the fifth dc current signal Id5 can be obtained based on the following formula:
Ud5＝Ud4＝Ud3＝Ud2＝Ud1
the inverter 1025 is configured to generate a fifth ac voltage signal U5 according to the fifth dc voltage signal Ud5, generate a fifth ac current signal I5 according to the fifth dc current signal Id5, and input the fifth ac voltage signal U5 and the fifth ac current signal I5 to the grid-connected transformer 103 by the inverter 1025. Optionally, the inverter 1025 has an operating efficiency η 5 Output power is P5, then:
optionally, the wind turbine generator 101 in the embodiment of the present application may include a first fan and a second fan, as shown in fig. 3, the fans may include a first wind wheel 3011 in the first fan and a second wind wheel 3012 in the second fan, and the motors may include a first motor 3021 in the first fan and a second motor 3022 in the second fan, where the first motor 3021 and the second motor 3022 may be dual-winding single-rotor motors, including a rotor first stator winding and a second stator winding.
In the first fan, the first wind wheel 3011 is connected to the first motor 3021 (specifically, the first wind wheel 3011 is connected to a rotor of the first motor 3021), a first output end of the first motor 3021 is used as a first output end of the wind turbine 101, and a second output end of the first motor 3021 is used as a second output end of the wind turbine 101. The first wind wheel 3011 rotates under the action of wind force to drive the rotor of the first motor 3021 to rotate, so that the first motor 3021, specifically, a first stator winding in the first motor 3021, outputs a first alternating voltage signal U1 and a first alternating current signal I1 from a first output end of the first motor 3021, namely, a first output end of the wind turbine 101 when the first wind wheel 3011 drives the rotor of the first motor 3021 to rotate, and simultaneously, enables the first motor 3021, specifically, a second stator winding in the first motor 3021, and outputs a second alternating voltage signal U2 and a second alternating current signal I2 from a second output end of the first motor 3021, namely, a second output end of the wind turbine 101 when the first wind wheel 3011 drives the rotor of the first motor 3021 to rotate.
In the second fan, the second wind wheel 3012 is connected to the second motor 3022 (specifically, the second wind wheel 3012 is connected to a rotor of the second motor 3022), a first output end of the second motor 3022 is used as a third output end of the wind turbine 101, and a second output end of the second motor 3022 is used as a fourth output end of the wind turbine 101. The second wind wheel 3012 rotates under the action of wind force to drive the rotor of the second motor 3022 to rotate, so that the second motor 3022, specifically, a first stator winding in the second motor 3022, outputs a third alternating voltage signal U3 and a third alternating current signal I3 from a first output end of the second motor 3022, that is, a third output end of the wind turbine 101 when the second wind wheel 3012 drives the rotor of the second motor 3022 to rotate, and simultaneously, makes the second motor 3022, specifically, a second stator winding in the second motor 3022, output a fourth alternating voltage signal U4 and a fourth alternating current signal I4 from a second output end of the second motor 3022, that is, a fourth output end of the wind turbine 101 when the second wind wheel 3012 drives the rotor of the second motor 3022 to rotate.
The four-input single-output direct current series-parallel grid-connected switching system for wind power generation provided by the embodiment of the application is characterized in that a wind wheel is connected with a motor corresponding to the wind wheel, a first output end of the wind turbine is connected with an input end of a first rectifier, a second output end of the wind turbine is connected with an input end of a second rectifier, a third output end of the wind turbine is connected with an input end of a third rectifier, a fourth output end of the wind turbine is connected with an input end of a fourth 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 the mechanical switch, a first parallel fixed end of the mechanical switch is connected with an input negative end of the inverter, a second parallel fixed end of the mechanical switch is connected with an input positive end of the inverter, a first serial fixed end of the mechanical switch is connected with a second serial fixed end of the mechanical switch, an output negative end of the second rectifier is connected with a third free end of the mechanical switch, a third parallel fixed end of the mechanical switch is connected with an output positive end of the fourth rectifier is connected with an output positive end of the mechanical switch of the fourth rectifier in parallel, a fourth parallel connection of the mechanical switch is connected with a fourth free end of the mechanical switch is connected with an output of the fourth rectifier in parallel, a fifth free end of the mechanical switch is connected with the output of the fourth rectifier is connected with the fourth free end of the mechanical switch in parallel, the fifth serial connection fixed end of the mechanical switch is connected with the sixth serial connection fixed end of the mechanical switch, the output negative end of the fourth 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 connection fixed end of the mechanical switch and the first serial connection fixed end of the mechanical switch, the second free end of the mechanical switch is switched and connected with the second parallel connection fixed end of the mechanical switch and the second serial connection fixed end of the mechanical switch, the third free end of the mechanical switch is switched and connected with the third parallel connection fixed end of the mechanical switch and the third serial connection fixed end of the mechanical switch, the fourth free end of the mechanical switch is switched and connected with the fifth parallel connection fixed end of the mechanical switch and the fifth serial connection fixed end of the mechanical switch, and the sixth free end of the mechanical switch is switched and connected with the sixth parallel connection fixed end of the mechanical switch. According to the four-input single-output direct current series-parallel grid-connected switching system for wind power generation, provided by the embodiment of the application, the six sets of mechanical selection switches form the switching switch, different functions of series boosting and parallel converging on the direct current side of the grid-connected system are realized through the action of the switching switch according to the 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 switching switch, the voltage level of a direct current bus of a 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 converter system, the number of grid-side inverters is reduced from four to 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 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 (6)
1. A four-input single-output direct current series-parallel grid-connected switching system for wind power generation is characterized by comprising: the wind turbine comprises a wind wheel and a motor corresponding to the wind wheel, wherein the five-input-port converter comprises a first rectifier, a second rectifier, a third rectifier, a fourth rectifier, an inverter and a mechanical switch;
the wind wheel is connected with the motor corresponding to the wind wheel;
the first output end of the wind turbine generator is connected with the input end of the first rectifier, the second output end of the wind turbine generator is connected with the input end of the second rectifier, the third output end of the wind turbine generator is connected with the input end of the third rectifier, the fourth output end of the wind turbine generator is connected with the input end of the fourth rectifier, the 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 third free end of the mechanical switch, the third parallel fixed end of the mechanical switch is connected with the input negative end of the inverter, the output positive end of the third rectifier is connected with the fourth free end of the mechanical switch, the fourth parallel fixed end of the mechanical switch is connected with the input positive end of the inverter, the third series fixed end of the mechanical switch is connected with the fourth series fixed end of the mechanical switch, the output negative end of the third rectifier is connected with the fifth free end of the mechanical switch, the fifth parallel fixed end of the mechanical switch is connected with the input negative end of the inverter, the output positive end of the fourth rectifier is connected with the sixth free end of the mechanical switch, the sixth parallel fixed end of the mechanical switch is connected with the input positive end of the inverter, the fifth serial fixed end of the mechanical switch is connected with the sixth serial fixed end of the mechanical switch, the output negative end of the fourth 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 third free end of the mechanical switch is switched and connected with the third parallel fixed end of the mechanical switch and the third serial fixed end of the mechanical switch, the fourth free end of the mechanical switch is switched and connected with the fourth parallel fixed end of the mechanical switch and the fourth serial fixed end of the mechanical switch, the fifth free end of the mechanical switch is switched and connected with the fifth parallel fixed end of the mechanical switch and the sixth serial fixed end of the mechanical switch.
2. The four-input single-output direct current series-parallel grid-connected switching system for wind power generation according to claim 1, wherein the mechanical switch comprises a first single-pole double-throw switch, a second single-pole double-throw switch, a third single-pole double-throw switch, a fourth single-pole double-throw switch, a fifth single-pole double-throw switch and a sixth single-pole double-throw switch.
3. The four-input single-output direct current series-parallel grid-connected switching system for wind power generation according to claim 1, wherein the wind turbine generator comprises a first fan and a second fan;
the first fan comprises a first wind wheel and a first motor connected with the first wind wheel, a first output end of the first motor is used as a first output end of the wind turbine generator, and a second output end of the first motor is used as a second output end of the wind turbine generator;
the second fan comprises a second wind wheel and a second motor connected with the second wind wheel, a first output end of the second motor is used as a third output end of the wind turbine generator, and a second output end of the second motor is used as a fourth output end of the wind turbine generator.
4. The four-input single-output direct current series-parallel grid-connected switching system for wind power generation according to claim 3, wherein the first motor and the second motor are double-winding single-rotor motors.
5. The four-input single-output dc series-parallel grid-connected switching system for wind power generation according to claim 1, wherein the first rectifier, the second rectifier, the third rectifier, and the fourth rectifier are full-power rectifiers, and the inverter is a full-power inverter.
6. The four-input single-output direct current series-parallel grid-connected switching system for wind power generation according to claim 1, wherein the motor is a permanent magnet synchronous generator, and the wind wheel is a three-blade wind wheel.
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