CN114123311A - Single-wind-wheel double-winding motor direct-current parallel unified grid-connected system - Google Patents
Single-wind-wheel double-winding motor direct-current parallel unified grid-connected system Download PDFInfo
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- CN114123311A CN114123311A CN202111250421.6A CN202111250421A CN114123311A CN 114123311 A CN114123311 A CN 114123311A CN 202111250421 A CN202111250421 A CN 202111250421A CN 114123311 A CN114123311 A CN 114123311A
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- 230000001360 synchronised effect Effects 0.000 claims abstract description 5
- 238000010248 power generation Methods 0.000 abstract description 12
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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Abstract
The application provides a single wind wheel duplex winding motor direct current is parallelly connected unified and is incorporated into power networks system includes: the wind wheel is connected with the motor, the motor is connected with the input end of the first rectifier and the input end of the second rectifier respectively, 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 input negative end of the inverter, the output positive end of the second rectifier is connected with the input positive end of the inverter, the output negative end of the second rectifier is connected with the input negative end of the inverter, and the output end of the inverter is connected with the grid-connected transformer. The double-winding synchronous generator is adopted, so that the energy density and the generating efficiency of the generator set are improved, and the fault redundancy and the reliability of a system are enhanced; on the basis that the direct-current side voltage of the converter system is not changed, the output power of the system is increased by collecting current, two grid-side converters are reduced to one, the weight and the cost of equipment are reduced, the system loss is reduced, and the grid-connected power generation efficiency is improved.
Description
Technical Field
The application relates to the technical field of wind power generation, in particular to a single-wind-wheel double-winding motor direct-current parallel unified grid-connected system.
Background
In recent years, the annual growth rate of the global renewable energy utilization reaches 25%, the renewable energy utilization is dominated by the power industry, and the power generation proportion of non-hydraulic renewable energy is doubled. Wind power generation is used as renewable energy power generation with the most mature technology except hydroelectric power generation, the installed capacity of the wind power generation accounts for the vast majority of the installed total capacity of the whole renewable energy power generation, but the limit of the performance of power electronic devices causes certain bottleneck to the research and application of large-capacity wind turbine generators, and how to reasonably construct a grid-connected system becomes a problem to be solved in the industry urgently.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present application is to provide a single-wind-wheel double-winding motor dc parallel unified grid-connected system, so as to improve the energy density and the power generation efficiency of a unit, enhance the redundancy and reliability of system faults, increase the output power of the system, reduce the weight and cost of equipment, reduce the system loss, and improve the grid-connected power generation efficiency.
In order to achieve the above object, an embodiment of a first aspect of the present application provides a single-wind-wheel double-winding motor dc parallel unified grid-connected system, including: the wind turbine comprises a fan, a three-port converter and a grid-connected transformer, wherein the fan comprises a wind wheel and a motor, and the three-port converter comprises a first rectifier, a second rectifier and an inverter; the wind wheel is connected with the motor, and the motor is used for outputting a first alternating current signal U1, a first alternating current signal I1, a second alternating current signal U2 and a second alternating current signal I2 when the wind wheel rotates; the motor is respectively connected with the input end of the first rectifier and the input end of the second rectifier, the positive output end of the first rectifier is connected with the positive input end of the inverter, the negative output end of the first rectifier is connected with the negative input end of the inverter, the positive output end of the second rectifier is connected with the positive input end of the inverter, the negative output end of the second rectifier is connected with the negative input end of the inverter, and the output end of the inverter is connected with the grid-connected transformer; the first rectifier is used for generating a first direct current voltage signal Ud1 according to the first alternating current voltage signal U1 and generating a first direct current signal Id1 according to the first alternating current signal I1, the second rectifier is used for generating a second direct current voltage signal Ud2 according to the second alternating current signal U2 and generating a second direct current signal Id2 according to the second alternating current signal I2, the inverter is used for generating a third alternating current signal U3 according to the third direct current voltage signal Ud3 and generating a third alternating current signal I3 according to the third direct current signal Id3 and inputting the third alternating current signal U3 and the third alternating current signal I3 to the grid-connected transformer, wherein the third direct current voltage signal Ud3 is obtained according to the first direct current voltage signal Ud1 and/or the second direct current signal Ud2, the third dc current signal Id3 is obtained from the first dc current signal Id1 and the second dc current signal Id 2.
The single-wind-wheel double-winding motor direct-current parallel unified grid-connected system provided by the embodiment of the application is characterized in that a wind wheel is connected with a motor, the motor is used for outputting a first alternating-current voltage signal U1, a first alternating-current signal I1, a second alternating-current voltage signal U2 and a second alternating-current signal I2 when the wind wheel rotates, the motor is respectively connected with the input end of a first rectifier and the input end of a second rectifier, the output positive end of the first rectifier is connected with the input positive end of an inverter, the output negative end of the first rectifier is connected with the input negative end of the inverter, the output positive end of the second rectifier is connected with the input positive end of the inverter, the output end of the inverter is connected with a grid-connected transformer, the first rectifier is used for generating a first direct-current voltage signal Ud2 according to the first alternating-current voltage signal U1 and generating a first direct-current signal Id1 according to the first alternating-current signal I1, the second rectifier is used for generating a second direct current voltage signal Ud2 according to a second alternating current signal U2 and generating a second direct current signal Id2 according to a second alternating current signal I2, the inverter is used for generating a third alternating current signal U3 according to a third direct current signal Ud3 and generating a third alternating current signal I3 according to a third direct current signal Id3 and inputting the third alternating current signal U3 and a third alternating current signal I3 to the grid-connected transformer, wherein the third direct current voltage signal Ud3 is obtained according to the first direct current voltage signal Ud1 and/or the second direct current signal Ud2, and the third direct current signal Id3 is obtained according to the first direct current signal Id1 and the second direct current signal Id 2. According to the direct-current parallel unified grid-connected system of the single-wind-wheel double-winding motor, one wind wheel is adopted to drive one motor, the motor is connected and connected through the three-port converter, and the parallel connection and convergence function is achieved; on the basis that the direct-current side voltage of the converter system is not changed, the output power of the system is increased by collecting current, two grid-side converters are reduced to one, the weight and the cost of equipment are reduced, the system loss is reduced, and the grid-connected power generation efficiency is improved.
According to one embodiment of the application, the electric machine is a permanent magnet synchronous generator.
According to one embodiment of the application, the electric machine is a double winding single rotor electric machine.
According to one embodiment of the application, the first rectifier is a full power rectifier.
According to one embodiment of the application, the second rectifier is a full power rectifier.
According to one embodiment of the application, the inverter is a full power inverter.
According to one embodiment of the application, the rotor is a three-bladed rotor.
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 single-wind-wheel double-winding motor direct-current parallel unified grid-connected system according to an embodiment of the 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 direct-current parallel connection unified grid-connected system of the single-wind-wheel double-winding motor according to the embodiment of the application is described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a single-wind-wheel double-winding motor dc parallel unified grid-connected system according to an embodiment of the present application, and as shown in fig. 1, the single-wind-wheel double-winding motor dc parallel unified grid-connected system according to the embodiment of the present application may specifically include: fan 101, three-port converter 102 and grid-connected transformer 103, wherein:
the wind turbine 101 includes a wind rotor 1011 and a motor 1012, and the three-port converter 102 includes a first rectifier 1021, a second rectifier 1022, and an inverter 1023. The motor 1012 may be a dual-winding single-rotor motor, and may include a rotor, a first stator winding, and a second stator winding.
The motor 1012 (specifically, the first stator winding and the second stator winding of the motor 1012) is respectively connected to the input terminal of the first rectifier 1021 and the input terminal of the second rectifier 1022 through three-phase lines, the positive output terminal of the first rectifier 1021 is connected to the positive input terminal of the inverter 1023 through a dc bus, the negative output terminal of the first rectifier 1021 is connected to the negative input terminal of the inverter 1023 through a dc bus, the positive output terminal of the second rectifier 1022 is connected to the positive input terminal of the inverter 1023 through a dc bus, the negative output terminal of the second rectifier 1022 is connected to the negative input terminal of the inverter 1023 through a dc bus, the output terminal of the inverter 1023 is connected to the grid-connected transformer 103 through a three-phase line, that is, the three-port converter 102 has a first rectifier 1021 and a second rectifier 1022 on the motor side as its two input terminals, and after parallel-connected and converged by a dc bus, they are collectively connected to the grid by the grid-side inverter 1023. The first rectifier 1021 may be a full power rectifier, the second rectifier 1022 may be a full power rectifier, and the inverter 1023 may be a full power inverter.
The first rectifier 1021 is used for generating a first direct current voltage signal Ud1 according to the first alternating current voltage signal U1 and generating a first direct current signal Id1 according to the first alternating current signal I1, the output power of the first rectifier 1021 is P1, and the work efficiency is eta1Then, 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:
based on the above description of the connection manner of the first rectifier 1021, the second rectifier 1022 and the inverter 1023 in the embodiment of the present application, it can be seen that the first rectifier 1021 and the second rectifier 1022 are connected in parallel on the dc side and then connected to the dc input terminal of the inverter 1023, the inverter 1023 is dc-input with the third dc voltage signal Ud3, and the inverter 1023 is dc-input with the third dc current signal Id3, where the third dc voltage signal Ud3 and the third dc current signal Id3 can be obtained based on the following formulas:
Ud3＝Ud2＝Ud1
the inverter 1023 is used for generating a third alternating voltage signal U3 according to the third direct voltage signal Ud3 and generating a third alternating current signal I3 according to the third direct current signal Id3, and the operating efficiency of the inverter 1023 is eta3The output power is P3; the inverter 1023 inputs the third alternating voltage signal U3 and the third alternating current signal I3 to the grid-connected transformer 103. Optionally, the inverter 1023 has an operating efficiency η3And the output power is P3, then:
the single-wind-wheel double-winding motor direct-current parallel unified grid-connected system provided by the embodiment of the application is characterized in that a wind wheel is connected with a motor, the motor is used for outputting a first alternating-current voltage signal U1, a first alternating-current signal I1, a second alternating-current voltage signal U2 and a second alternating-current signal I2 when the wind wheel rotates, the motor is respectively connected with the input end of a first rectifier and the input end of a second rectifier, the output positive end of the first rectifier is connected with the input positive end of an inverter, the output negative end of the first rectifier is connected with the input negative end of the inverter, the output positive end of the second rectifier is connected with the input positive end of the inverter, the output end of the inverter is connected with a grid-connected transformer, the first rectifier is used for generating a first direct-current voltage signal Ud2 according to the first alternating-current voltage signal U1 and generating a first direct-current signal Id1 according to the first alternating-current signal I1, the second rectifier is used for generating a second direct current voltage signal Ud2 according to a second alternating current signal U2 and generating a second direct current signal Id2 according to a second alternating current signal I2, the inverter is used for generating a third alternating current signal U3 according to a third direct current signal Ud3 and generating a third alternating current signal I3 according to a third direct current signal Id3, and inputting the third alternating current signal U3 and a third alternating current signal I3 to the grid-connected transformer, wherein the third direct current voltage signal Ud3 is obtained according to the first direct current voltage signal Ud1 and/or the second direct current signal Ud2, and the third direct current signal Id3 is obtained according to the first direct current signal Id1 and the second direct current signal Id 2. The single-wind-wheel double-winding motor direct-current parallel unified grid-connected system provided by the embodiment of the application adopts a three-blade wind wheel to drive a double-winding single-rotor permanent magnet synchronous generator, and is connected and connected with a grid through a full-power three-port converter, so that the direct-current bus parallel connection and confluence function is realized; on the basis that the direct-current side voltage of the converter system is not changed, the output power of the system is increased by collecting current, two grid-side converters are reduced to one, the weight and the cost of equipment are reduced, the system loss is reduced, and the grid-connected power generation efficiency 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 (7)
1. The utility model provides a single wind wheel duplex winding motor direct current is parallelly connected unified and is incorporated into power networks system which characterized in that includes: the wind turbine comprises a fan, a three-port converter and a grid-connected transformer, wherein the fan comprises a wind wheel and a motor, and the three-port converter comprises a first rectifier, a second rectifier and an inverter;
the wind wheel is connected with the motor, and the motor is used for outputting a first alternating current signal U1, a first alternating current signal I1, a second alternating current signal U2 and a second alternating current signal I2 when the wind wheel rotates;
the motor is respectively connected with the input end of the first rectifier and the input end of the second rectifier, the positive output end of the first rectifier is connected with the positive input end of the inverter, the negative output end of the first rectifier is connected with the negative input end of the inverter, the positive output end of the second rectifier is connected with the positive input end of the inverter, the negative output end of the second rectifier is connected with the negative input end of the inverter, and the output end of the inverter is connected with the grid-connected transformer;
the first rectifier is used for generating a first direct current voltage signal Ud1 according to the first alternating current voltage signal U1 and generating a first direct current signal Id1 according to the first alternating current signal I1;
the second rectifier is used for generating a second direct current signal Id2 according to the second alternating current signal U2 and a second direct current signal Ud2 according to the second alternating current signal I2;
the inverter is configured to generate a third ac voltage signal U3 according to a third dc voltage signal Ud3, and generate a third ac current signal I3 according to a third dc current signal Id3, and input the third ac voltage signal U3 and the third ac current signal I3 to the grid-connected transformer, wherein the third dc voltage signal Ud3 is obtained according to the first dc voltage signal Ud1 and/or the second dc voltage signal Ud2, and the third dc current signal Id3 is obtained according to the first dc voltage signal Id 63 1 and the second dc current signal Id 2.
2. The single-wind-wheel double-winding motor direct-current parallel unified grid-connected system according to claim 1, wherein the motor is a permanent magnet synchronous generator.
3. The direct-current parallel unified grid-connected system of the single-wind-wheel double-winding motor according to claim 1, wherein the motor is a double-winding single-rotor motor.
4. The single-wind-wheel double-winding motor direct-current parallel unified grid-connected system according to claim 1, wherein the first rectifier is a full-power rectifier.
5. The single-wind-wheel double-winding motor direct-current parallel unified grid-connected system according to claim 1, wherein the second rectifier is a full-power rectifier.
6. The single-wind-wheel double-winding motor direct-current parallel unified grid-connected system according to claim 1, wherein the inverter is a full-power inverter.
7. The single-wind-wheel double-winding motor direct-current parallel unified grid-connected system according to claim 1, wherein the wind wheel is a three-blade wind wheel.
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| CN202111250421.6A CN114123311A (en) | 2021-10-26 | 2021-10-26 | Single-wind-wheel double-winding motor direct-current parallel unified grid-connected system |
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| CN202111250421.6A CN114123311A (en) | 2021-10-26 | 2021-10-26 | Single-wind-wheel double-winding motor direct-current parallel unified grid-connected system |
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| CN201167296Y (en) * | 2007-12-14 | 2008-12-17 | 张勇 | Directly-drive type ac excitation wind power generator system |
| CN112952900A (en) * | 2021-01-26 | 2021-06-11 | 中国华能集团清洁能源技术研究院有限公司 | Fault ride-through control method and system for double-wind-wheel wind generating set |
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2021
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| CN201167296Y (en) * | 2007-12-14 | 2008-12-17 | 张勇 | Directly-drive type ac excitation wind power generator system |
| CN112952900A (en) * | 2021-01-26 | 2021-06-11 | 中国华能集团清洁能源技术研究院有限公司 | Fault ride-through control method and system for double-wind-wheel wind generating set |
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Application publication date: 20220301 |