CN114123306A - Four-input double-output direct current series-parallel connection grid-connected switching system for wind power generation - Google Patents
Four-input double-output direct current series-parallel connection grid-connected switching system for wind power generation Download PDFInfo
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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 dual-output direct current series-parallel connection switching system for wind power generation, which comprises: 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, series-parallel connection switching can be achieved inside 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 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, four grid side inverters are reduced into 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.
Description
Technical Field
The application relates to the technical field of wind power generation, in particular to a four-input double-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 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 four-input dual-output dc series-parallel grid-connected switching system for wind power generation, 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.
To achieve the above object, an embodiment of the first aspect of the present application provides a four-input dual-output dc series-parallel grid-connection switching system for wind power generation, including: the wind power generation system comprises a wind power generation set, a six-port converter and a grid-connected transformer, wherein the wind power generation set comprises a wind wheel and a motor corresponding to the wind wheel, the six-port converter comprises a first rectifier, a second rectifier, a third rectifier, a fourth rectifier, a first inverter, a second inverter and a mechanical switch, and the grid-connected transformer is a double-split transformer; the wind wheel is connected with the motor corresponding to the wind wheel; the first output of wind turbine generator system with the input of first rectifier is connected, the second output of wind turbine generator system with the input of second rectifier is connected, the third output of wind turbine generator system with the input of third rectifier is connected, the fourth output of wind turbine generator system with the input of fourth rectifier is connected, the positive end of output of first rectifier respectively with the positive end of input of first dc-to-ac converter with the positive end of input of second 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 respectively with the negative end of input of first dc-to-ac converter with the negative end of input of second dc-to-ac converter is connected, the output of second rectifier with mechanical switch's second free end is connected, mechanical switch's second parallel stiff end respectively with the positive end of input of first dc-to-ac converter with the positive end of second dc-to-ac converter The positive end of input connect, mechanical switch's first series stiff end with mechanical switch's the second series stiff end is connected, the output negative terminal of second rectifier with mechanical switch's third free end is connected, mechanical switch's the parallelly connected stiff end of third respectively with the input negative terminal of first dc-to-ac converter with the input negative terminal of second dc-to-ac converter is connected, the output positive terminal of third rectifier with mechanical switch's fourth free end is connected, mechanical switch's the parallelly connected stiff end of fourth respectively with the input positive terminal of first dc-to-ac converter with the input positive terminal of second dc-to-ac converter is connected, mechanical switch's the third series stiff end with mechanical switch's the fourth series stiff end is connected, the output negative terminal of third rectifier with mechanical switch's fifth free end is connected, mechanical switch's the parallelly connected fifth respectively with the input negative terminal of first dc-to-ac converter with the input negative terminal of second dc-to-ac converter links the stiff end And 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 respectively connected with the input positive end of the first inverter and the input positive end of the second inverter, the fifth series fixed end of the mechanical switch is connected with the sixth series fixed end of the mechanical switch, the output negative end of the fourth rectifier is respectively connected with the input negative end of the first inverter and the output negative end of the second inverter, the output end of the first inverter is connected with the first input end of the grid-connected transformer, the output end of the second inverter is connected with the second input end of 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, and 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 free end of the mechanical switch The series connection stiff end, the third free end of mechanical switch switches to be connected the third parallel connection stiff end of mechanical switch with the third series connection stiff end of mechanical switch, the fourth of mechanical switch is connected by the end switch the fourth parallel connection stiff end of mechanical switch with the fourth series connection stiff end of mechanical switch, the fifth free end of mechanical switch switches to be connected the fifth parallel connection stiff end of mechanical switch with the fifth series connection stiff end of mechanical switch, the sixth free end of mechanical switch switches to be connected the sixth parallel connection stiff end of mechanical switch with the sixth series connection stiff end of mechanical switch.
The four-input dual-output direct current series-parallel grid-connected switching system for wind power generation provided by the embodiment of the application comprises a wind wheel connected with a motor corresponding to the wind wheel, a first output end of a wind turbine generator set connected with an input end of a first rectifier, a second output end of the wind turbine generator set connected with an input end of a second rectifier, a third output end of the wind turbine generator set connected with an input end of a third rectifier, a fourth output end of the wind turbine generator set connected with an input end of a fourth rectifier, an output positive end of the first rectifier connected with an input positive end of a first inverter and an input positive end of a second inverter respectively, an output negative end of the first rectifier connected with a first free end of a mechanical switch, a first parallel fixed end of the mechanical switch connected with an input negative end of the first inverter and an input negative end of the second inverter respectively, an output positive end of the second rectifier connected with a second free end of the mechanical switch, the second parallel fixed end of the mechanical switch is respectively connected with the input positive end of the first inverter and the input positive end of the second 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 respectively connected with the input negative end of the first inverter and the input negative end of the second 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 respectively connected with the input positive end of the first inverter and the input positive end of the second 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, and the fifth parallel fixed end of the mechanical switch is respectively connected with the input negative end of the first inverter and the input negative end of the second inverter, the output positive end of a fourth rectifier is connected with a sixth free end of a mechanical switch, a sixth parallel fixed end of the mechanical switch is respectively connected with the input positive end of the first inverter and the input positive end of the second inverter, a fifth series fixed end of the mechanical switch is connected with a sixth series fixed end of the mechanical switch, an output negative end of the fourth rectifier is respectively connected with the input negative end of the first inverter and the output negative end of the second inverter, the output end of the first inverter is connected with the first input end of the grid-connected transformer, the output end of the second inverter is connected with the second input end of 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, and 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 series fixed end of the mechanical switch The fixed end, mechanical switch's fourth is from the fourth parallel connection stiff end of end switch connection mechanical switch and the fourth series connection stiff end of mechanical switch, and mechanical switch's fifth parallel connection stiff end and mechanical switch's fifth series connection stiff end are connected in mechanical switch's fifth free end switch, and mechanical switch's sixth parallel connection stiff end and mechanical switch's sixth series connection stiff end are connected in mechanical switch's sixth free end switch. The four-input double-output direct current series-parallel grid-connected switching system for wind power generation comprises six sets of mechanical selection switches, different functions of series boosting and parallel converging of the direct current side of the grid-connected system are achieved through actions of the switching switches according to requirements of the grid-connected system, the system can work in a direct current side series mode and a direct current side parallel mode according to different working states of the switching switches, the direct current bus voltage level of a system current conversion system can be improved, or the output power of the system is increased through collecting current on the basis of unchanged direct current side voltage of the current conversion system, four grid-side inverters are reduced into 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.
According to one embodiment of the application, 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.
According to one embodiment of the application, 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, the first output end of the first motor is used as the first output end of the wind turbine generator, and the second output end of the first motor is used as the 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, the first output end of the second motor serves as the third output end of the wind turbine generator, and the second output end of the second motor serves as the fourth output end of the wind turbine generator.
According to an embodiment of the application, the first and second electrical machines are double-winding single-rotor electrical machines.
According to an embodiment of the application, the first rectifier, the second rectifier, the third rectifier and the fourth rectifier are full power rectifiers, and the first inverter and the second inverter are full power inverters.
According to one embodiment of the application, the motor is a permanent magnet synchronous generator and the wind wheel is a three-blade 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 four-input dual-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;
fig. 3 is a schematic structural diagram of a wind turbine generator system in a four-input dual-output dc series-parallel grid-connected switching system for wind power generation 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 four-input dual-output dc series-parallel grid-connected switching system for wind power generation according to the embodiment of the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a four-input dual-output dc series-parallel grid-connected switching system for wind power generation according to an embodiment of the present application, and as shown in fig. 1, the four-input dual-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 generator 101, six port converters 102 and grid-connected transformer 103, wherein:
the wind turbine generator 101 includes a wind rotor 1011 and a motor 1012 corresponding to the wind rotor 1011, and the six-port converter 102 includes a first rectifier 1021, a second rectifier 1022, a third rectifier 1023, a fourth rectifier 1024, a first inverter 1025, a second inverter 1026, and a mechanical switch 1027.
The wind wheel 1011 is connected to 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 can be a permanent magnet synchronous generator, and the wind wheel 1011 can be a three-blade wind wheel.
A first output end of the wind turbine generator 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 generator 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 generator 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 generator 101 is connected with an input end of a fourth rectifier 1024 through a three-phase line, positive output ends of the first rectifier 1021 are respectively connected with positive input ends of a first inverter 1025 and a second inverter 1026 through direct current buses, negative output ends of the first rectifier 1021 are respectively connected with a first free end 201 (shown in fig. 2) of a mechanical switch 1027 through a direct current bus, a first parallel fixed end 202 (shown in fig. 2) of the mechanical switch 1027 is respectively connected with a negative input end of the first inverter and a negative input end of the second inverter 1026 through a direct current bus 1025, the positive output terminal of the second rectifier 1022 is connected to the second free terminal 203 (shown in fig. 2) of the mechanical switch 1027 through a dc bus, the second parallel fixed terminal 204 (shown in fig. 2) of the mechanical switch 1027 is connected to the positive input terminal of the first inverter 1025 and the positive input terminal of the second inverter 1026 through a dc bus, the first series fixed terminal 205 (shown in fig. 2) of the mechanical switch 1027 is connected to the second series fixed terminal 206 (shown in fig. 2) of the mechanical switch 1027 through a dc bus, the negative output terminal of the second rectifier 1022 is connected to the third free terminal 207 (shown in fig. 2) of the mechanical switch 1027 through a dc bus, the third parallel fixed terminal 208 (shown in fig. 2) of the mechanical switch 1027 is connected to the negative input terminal of the first inverter 1025 and the negative input terminal of the second inverter through a dc bus, the positive output terminal 1023 of the third rectifier 1023 is connected to the fourth free terminal 209 (shown in fig. 2) of the mechanical switch 1027 through a dc bus, a fourth parallel fixed end 210 (shown in fig. 2) of the mechanical switch 1027 is respectively connected with an input positive end of the first inverter 1025 and an input positive end of the second inverter 1026 through a direct current bus, a third series fixed end 211 (shown in fig. 2) of the mechanical switch 1027 is connected with a fourth series fixed end 212 (shown in fig. 2) of the mechanical switch 1027 through a direct current bus, an output negative end of the third rectifier 1023 is connected with a fifth free end 213 of the mechanical switch 1027 through a direct current bus, a fifth parallel fixed end 214 of the mechanical switch 1027 is respectively connected with an input negative end of the first inverter 1025 and an input negative end of the second inverter 1026 through a direct current bus, an output of the fourth rectifier 1024 is connected with a sixth free end 215, which is a positive end of the mechanical switch 1027, a sixth parallel fixed end 216 of the mechanical switch 1027 is respectively connected with an input positive end of the first inverter 1025 and an input negative end of the second inverter 1026 through a direct current bus, a fifth serial fixed end 217 of the mechanical switch 1027 is connected to a sixth serial fixed end 218 of the mechanical switch 1026, an output negative end of the fourth rectifier 1024 is respectively connected to an input negative end of the first inverter 1025 and an input negative end of the second inverter 1026 through a dc bus, an output end of the first inverter 1205 is connected to a first input end of the grid-connected transformer 103 through a dc bus, and an output end of the second inverter 1206 is connected to a second input end of the grid-connected transformer 103 through a dc bus.
A first free end 201 (shown in fig. 2) of the mechanical switch 1027 is switchably connected to a first parallel fixed end 202 (shown in fig. 2) of the mechanical switch 1027 and a first series fixed end 205 (shown in fig. 2) of the mechanical switch 1027, a second free end 203 (shown in fig. 2) of the mechanical switch 1027 is switchably connected to a second parallel fixed end 204 (shown in fig. 2) of the mechanical switch 1027 and a second series fixed end 206 (shown in fig. 2) of the mechanical switch 1027, a third free end 207 (shown in fig. 2) of the mechanical switch 1027 is switchably connected to a third parallel fixed end 208 (shown in fig. 2) of the mechanical switch 1027 and a third series fixed end 211 (shown in fig. 2) of the mechanical switch 1027, a fourth free end 209 (shown in fig. 2) of the mechanical switch 1027 is switchably connected to a fourth parallel fixed end 210 (shown in fig. 2) of the mechanical switch 1027 and a fourth series fixed end 212 (shown in fig. 2) of the mechanical switch 1027, a fifth free end 213 (shown in fig. 2) of the mechanical switch 1027 is switchably connected to a fifth parallel fixed end 214 (shown in fig. 2) of the mechanical switch 1027 and a fifth series fixed end 217 (shown in fig. 2) of the mechanical switch 1027, and a sixth free end 215 (shown in fig. 2) of the mechanical switch 1027 is switchably connected to a sixth parallel fixed end 216 (shown in fig. 2) of the mechanical switch 1027 and a sixth series fixed end 218 (shown in fig. 2) of the mechanical switch 1027, so that the system shares two working states, i.e., a state 1 in which an end point corresponding to 1 in fig. 1 is selectively connected and a series connection state 2 in which an end point corresponding to 2 in fig. 1 is selectively connected, and different functions of series boosting and parallel 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, the third rectifier 1023 may be a full power rectifier, the fourth rectifier 1024 may be a full power rectifier, the first inverter 1025 may be a full power inverter, the second inverter 1026 may be a full power inverter, and the grid-connected transformer 103 may be a double split transformer.
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 third rectifier 1023 is used for generating a third dc voltage signal Ud3 according to the third ac voltage signal U3 and a third dc current signal Id3 according to the third ac current signal I3, the third rectifier 1023 has an output power P3 and an operating efficiency η3And then:
the fourth rectifier 1024 is used for generating a fourth dc voltage signal Ud4 according to the fourth ac voltage signal U4 and generating a fourth dc current signal Id4 according to the fourth ac current signal I4, the output power of the fourth rectifier 1024 is P4, and the operating efficiency is η4And then:
based on the above description of the connection manner of the first rectifier 1021, the second rectifier 1022, the third rectifier 1023, the fourth rectifier 1024, the first inverter 1025 and the second inverter 1026 in the embodiment of the present application, it can be seen that 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 then connected to the dc input terminals of the first inverter 1025 and the second inverter 1026 connected in parallel on the dc side, the first inverter 1025 is dc-input with the fifth dc voltage signal Ud5 and the fifth dc current signal Id5, and the second inverter 1026 is dc-input with the sixth dc voltage signal Ud6 and the sixth dc current signal Id6, wherein the fifth dc voltage signal Ud5, the fifth dc current signal Id5, the sixth dc voltage signal Ud6 and the sixth dc current signal Id6 can be obtained based on the following formulas:
Ud6＝Ud5＝Ud4＝Ud3＝Ud2＝Ud1
wherein eta is5For the operating efficiency, eta, of the first inverter 10256For the second inverter 1026 to operate efficiently.
The first inverter 1025 is configured to generate a fifth ac voltage signal U5 according to the fifth dc voltage signal Ud5, and 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 first input terminal of the grid-connected transformer 103. Optionally, the first inverter 1025 has an operating efficiency η5And the output power is P5, then:
P5＝η5×Ud5×Id5
the second inverter 1026 is configured to generate a sixth ac voltage signal U6 according to the sixth dc voltage signal Ud6, and generate a sixth ac current signal I6 according to the sixth dc current signal Id6, and input the sixth ac voltage signal U6 and the sixth ac current signal I6 to the second input terminal of the grid-connected transformer 103. Optionally, the second inverter 1026 has an operating efficiency η6And the output power is P6, then:
P6＝η6×Ud6×Id6
optionally, the wind turbine 101 in the embodiment of the present application may include a first wind turbine and a second wind turbine, as shown in fig. 3, the wind turbines may include a first wind turbine 3011 in the first wind turbine and a second wind turbine 3012 in the second wind turbine, and the motors may include a first motor 3021 in the first wind turbine and a second motor 3022 in the second wind turbine, where the first motor 3021 and the second motor 3022 may be a double-winding single-rotor motor including a first stator winding and a second stator winding of a rotor.
In the first fan, a first wind wheel 3011 is connected to a 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 generator 101, and a second output end of the first motor 3021 is used as a second output end of the wind turbine generator 101. The first wind wheel 3011 rotates under the effect of wind power to drive the rotor of the first motor 3021 to rotate, so that the first motor 3021, specifically, the first stator winding in the first motor 3021, outputs a first ac voltage signal U1 and a first ac current signal I1 from a first output terminal of the first motor 3021, that is, a first output terminal of the wind turbine generator 101, when the first wind wheel 3011 drives the rotor of the first motor 3021 to rotate, and simultaneously, the first motor 3021, specifically, the second stator winding in the first motor 3021, outputs a second ac voltage signal U2 and a second ac current signal I2 from a second output terminal of the first motor 3021, that is, a second output terminal of the wind turbine generator 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 the rotor of the second motor 3022), the first output end of the second motor 3022 serves as the third output end of the wind turbine generator 101, and the second output end of the second motor 3022 serves as the fourth output end of the wind turbine generator 101. The second wind wheel 3012 rotates under the effect of wind power to drive the rotor of the second motor 3022 to rotate, so that the second motor 3022, specifically, the first stator winding in the second motor 3022, outputs a third ac voltage signal U3 and a third ac current signal I3 from the first output terminal of the second motor 3022, that is, the third output terminal of the wind turbine generator 101, when the second wind wheel 3012 drives the rotor of the second motor 3022 to rotate, and simultaneously, the second motor 3022, specifically, the second stator winding in the second motor 3022, outputs a fourth ac voltage signal U4 and a fourth ac current signal I4 from the second output terminal of the second motor 3022, that is, the fourth output terminal of the wind turbine generator 101, when the second wind wheel 3012 drives the rotor of the second motor 3022 to rotate.
The four-input dual-output direct current series-parallel grid-connected switching system for wind power generation provided by the embodiment of the application comprises a wind wheel connected with a motor corresponding to the wind wheel, a first output end of a wind turbine generator set connected with an input end of a first rectifier, a second output end of the wind turbine generator set connected with an input end of a second rectifier, a third output end of the wind turbine generator set connected with an input end of a third rectifier, a fourth output end of the wind turbine generator set connected with an input end of a fourth rectifier, an output positive end of the first rectifier connected with an input positive end of a first inverter and an input positive end of a second inverter respectively, an output negative end of the first rectifier connected with a first free end of a mechanical switch, a first parallel fixed end of the mechanical switch connected with an input negative end of the first inverter and an input negative end of the second inverter respectively, an output positive end of the second rectifier connected with a second free end of the mechanical switch, the second parallel fixed end of the mechanical switch is respectively connected with the input positive end of the first inverter and the input positive end of the second 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 respectively connected with the input negative end of the first inverter and the input negative end of the second 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 respectively connected with the input positive end of the first inverter and the input positive end of the second 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, and the fifth parallel fixed end of the mechanical switch is respectively connected with the input negative end of the first inverter and the input negative end of the second inverter, the output positive end of a fourth rectifier is connected with a sixth free end of a mechanical switch, a sixth parallel fixed end of the mechanical switch is respectively connected with the input positive end of the first inverter and the input positive end of the second inverter, a fifth series fixed end of the mechanical switch is connected with a sixth series fixed end of the mechanical switch, an output negative end of the fourth rectifier is respectively connected with the input negative end of the first inverter and the output negative end of the second inverter, the output end of the first inverter is connected with the first input end of the grid-connected transformer, the output end of the second inverter is connected with the second input end of 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, and 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 series fixed end of the mechanical switch The fixed end, mechanical switch's fourth is from the fourth parallel connection stiff end of end switch connection mechanical switch and the fourth series connection stiff end of mechanical switch, and mechanical switch's fifth parallel connection stiff end and mechanical switch's fifth series connection stiff end are connected in mechanical switch's fifth free end switch, and mechanical switch's sixth parallel connection stiff end and mechanical switch's sixth series connection stiff end are connected in mechanical switch's sixth free end switch. The four-input double-output direct current series-parallel grid-connected switching system for wind power generation comprises six sets of mechanical selection switches, different functions of series boosting and parallel converging of the direct current side of the grid-connected system are achieved through actions of the switching switches according to requirements of the grid-connected system, the system can work in a direct current side series mode and a direct current side parallel mode according to different working states of the switching switches, the direct current bus voltage level of a system current conversion system can be improved, or the output power of the system is increased through collecting current on the basis of unchanged direct current side voltage of the current conversion system, four grid-side inverters are reduced into 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 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 (6)
1. A four-input double-output direct current series-parallel grid-connected switching system for wind power generation is characterized by comprising: the wind power generation system comprises a wind power generation set, a six-port converter and a grid-connected transformer, wherein the wind power generation set comprises a wind wheel and a motor corresponding to the wind wheel, the six-port converter comprises a first rectifier, a second rectifier, a third rectifier, a fourth rectifier, a first inverter, a second inverter and a mechanical switch, and the grid-connected transformer is a double-split transformer;
the wind wheel is connected with the motor corresponding to the wind wheel;
the first output of wind turbine generator system with the input of first rectifier is connected, the second output of wind turbine generator system with the input of second rectifier is connected, the third output of wind turbine generator system with the input of third rectifier is connected, the fourth output of wind turbine generator system with the input of fourth rectifier is connected, the positive end of output of first rectifier respectively with the positive end of input of first dc-to-ac converter with the positive end of input of second 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 respectively with the negative end of input of first dc-to-ac converter with the negative end of input of second dc-to-ac converter is connected, the output of second rectifier with mechanical switch's second free end is connected, mechanical switch's second parallel stiff end respectively with the positive end of input of first dc-to-ac converter with the positive end of second dc-to-ac converter The positive end of input connect, mechanical switch's first series stiff end with mechanical switch's the second series stiff end is connected, the output negative terminal of second rectifier with mechanical switch's third free end is connected, mechanical switch's the parallelly connected stiff end of third respectively with the input negative terminal of first dc-to-ac converter with the input negative terminal of second dc-to-ac converter is connected, the output positive terminal of third rectifier with mechanical switch's fourth free end is connected, mechanical switch's the parallelly connected stiff end of fourth respectively with the input positive terminal of first dc-to-ac converter with the input positive terminal of second dc-to-ac converter is connected, mechanical switch's the third series stiff end with mechanical switch's the fourth series stiff end is connected, the output negative terminal of third rectifier with mechanical switch's fifth free end is connected, mechanical switch's the parallelly connected fifth respectively with the input negative terminal of first dc-to-ac converter with the input negative terminal of second dc-to-ac converter links the stiff end And 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 respectively connected with the input positive end of the first inverter and the input positive end of the second inverter, the fifth series fixed end of the mechanical switch is connected with the sixth series fixed end of the mechanical switch, the output negative end of the fourth rectifier is respectively connected with the input negative end of the first inverter and the output negative end of the second inverter, the output end of the first inverter is connected with the first input end of the grid-connected transformer, the output end of the second inverter is connected with the second input end of 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, and 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 free end of the mechanical switch The series connection stiff end, the third free end of mechanical switch switches to be connected the third parallel connection stiff end of mechanical switch with the third series connection stiff end of mechanical switch, the fourth of mechanical switch is connected by the end switch the fourth parallel connection stiff end of mechanical switch with the fourth series connection stiff end of mechanical switch, the fifth free end of mechanical switch switches to be connected the fifth parallel connection stiff end of mechanical switch with the fifth series connection stiff end of mechanical switch, the sixth free end of mechanical switch switches to be connected the sixth parallel connection stiff end of mechanical switch with the sixth series connection stiff end of mechanical switch.
2. The four-input dual-output dc series-parallel grid-connection switching system for wind power generation according to claim 1, wherein 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.
3. The four-input dual-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, the first output end of the first motor is used as the first output end of the wind turbine generator, and the second output end of the first motor is used as the 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, the first output end of the second motor serves as the third output end of the wind turbine generator, and the second output end of the second motor serves as the fourth output end of the wind turbine generator.
4. The four-input dual-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 system of claim 1, wherein the first, second, third and fourth rectifiers are full power rectifiers, and the first and second inverters are full power inverters.
6. The four-input double-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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