CN114123308A - Single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system - Google Patents
Single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system 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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Abstract
The application provides a single wind wheel duplex winding motor direct current series-parallel connection switches unified grid-connected system, includes: the wind wheel is connected with the motor, the motor is connected with the input positive end of the converter, and the output end of the series-parallel switching converter can be connected with the grid-connected transformer through the power switch element in the converter. According to different working states of the change-over switch, the system can work in a direct current side series connection mode and a direct current side parallel connection mode, the direct current bus voltage grade of a system current conversion system can be improved, or the output power of the system can be increased through collecting current on the basis that the direct current side voltage of the system current conversion system is not changed. The power switch device can reduce the loss caused by mechanical switching, reduce the volume and weight of the system and improve the response speed. The number of the grid-side converters is reduced from two to one, so that the weight and the cost of equipment are reduced, the line loss of a 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 single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system.
Background
In recent years, the annual growth rate of the global renewable energy utilization reaches 25%, the renewable energy utilization is dominated by the power industry, and the power generation proportion of non-hydraulic renewable energy is doubled. Wind power generation is used as renewable energy power generation with the most mature technology except hydroelectric power generation, the installed capacity of the wind power generation accounts for the vast majority of the installed total capacity of the whole renewable energy power generation, but the limit of the performance of power electronic devices causes certain bottleneck to the research and application of large-capacity wind turbine generators, and how to reasonably construct a grid-connected system becomes a problem to be solved in the industry urgently.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present application is to provide a single wind wheel double-winding motor dc series-parallel switching unified grid-connected system, so as to improve system output power, reduce loss caused by mechanical switches, reduce system volume and weight, improve response speed, reduce equipment weight and cost, reduce system line loss, reduce system control complexity, and improve grid-connected power generation efficiency of the system.
In order to achieve the above object, an embodiment of a first aspect of the present application provides a single wind wheel dual-winding motor dc series-parallel switching unified grid-connected system, including: the wind turbine comprises a wind turbine and a motor, the three-port converter comprises a first rectifier, a second rectifier, an inverter and power switching elements, and the power switching elements comprise a first power switching element, a second power switching element and a third power switching element; 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 terminal of the first rectifier is connected to the positive input terminal of the inverter, the negative output terminal of the first rectifier is connected to the negative input terminal of the inverter through the first power switching element, the negative output terminal of the first rectifier is connected with the positive output terminal of the second rectifier through the second power switch element, the positive output terminal of the second rectifier is connected with the positive input terminal of the inverter through the third power switching element, the output negative end of the second rectifier is connected with the input negative end of the inverter, the output end of the inverter is connected with the grid-connected transformer, the switching states of the first power switching element and the third power switching element are consistent, and the switching states of the second power switching element and the first power switching element are inconsistent; the first rectifier is configured to generate a first dc voltage signal Ud1 according to the first ac voltage signal U1 and a first dc current signal Id1 according to the first ac current signal I1, the second rectifier is configured to generate a dc voltage signal Ud1 according to the second ac voltage signal U2 and a second dc current signal Id2 according to the second ac current signal I2, the inverter is configured to generate a third ac voltage signal U3 according to the third dc voltage signal Ud3, generate a third ac current signal I3 according to the third dc current signal Id3, and input the third ac voltage signal Ud3 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 3 is obtained according to the first dc voltage signal U1 and/or the second dc current signal Id1 and/or the second dc current signal Id2 The direct current signal Id2 is obtained.
The single-wind-wheel double-winding motor direct-current series-parallel switching 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 through a first power switch element, the output negative end of the first rectifier is connected with the output positive end of the second rectifier through a second power switch element, the output positive end of the second rectifier is connected with the input positive end of the inverter through a third power switch element, the output negative end of the second rectifier is connected with the input negative end of the inverter, the output of the inverter is connected to the grid-connected transformer, the switching states of the first and third power switching elements are identical, the switching states of the second and third power switching elements are not identical, the first rectifier is configured to generate a first direct current voltage signal Ud1 from a first alternating current signal U1 and a first direct current signal Id1 from a first alternating current signal I1, the second rectifier is configured to generate a direct current signal Ud1 from a second alternating current signal U2 and a second direct current signal Id2 from a second alternating current signal I2, the inverter is configured to generate a third alternating current signal U3 from the third direct current voltage signal Ud3, generate a third alternating current signal I3 from the third direct current signal Id3 and input the third alternating current signal Ud3 and the third alternating current signal I3 to the grid-connected transformer, wherein the third direct current voltage signal Ud3 is based on the first direct current signal Ud1 and/or the second direct current signal Id 1/or the second direct current signal I3 The signal Ud2 is obtained and the third direct current signal Id3 is obtained from the first direct current signal Id1 and/or the second direct current signal Id 2. The single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system provided by the embodiment of the application comprises a change-over switch consisting of power electronic power switch elements, different functions of series connection boosting and parallel connection converging of a direct-current side of the grid-connected system are realized through the action of the change-over switch according to the requirement of the grid-connected system, the system can work in a direct-current side series mode and a direct-current side parallel mode according to different working states of the change-over switch, the direct-current bus voltage grade of a system current conversion system can be improved, or the output power of the system is increased through converging current on the basis of unchanged direct-current side voltage of the system current conversion system. The semiconductor switch device can reduce the loss caused by mechanical switching, reduce the volume and weight of the system and improve the response speed. The number of the grid-side converters is reduced from two to one, so that the weight and the cost of equipment are reduced, the line loss of a 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 an embodiment of the application, the power switching element is a transistor or a thyristor.
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 series-parallel switching 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 following describes a single-wind-wheel double-winding motor dc series-parallel switching unified grid-connected system according to an embodiment of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a single-wind-wheel double-winding motor dc series-parallel switching 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 series-parallel switching 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, an inverter 1023, and a power switching element 1024. The power switching elements include a first power switching element 10241, a second power switching element 10242, and a third power switching element 10243. The power switch element 1024 may be a Transistor or a thyristor, such as a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), which may be an N-type MOS Transistor or a P-type MOS Transistor. The wind wheel 1011 may be a three-blade wind wheel, and the motor 1012 may be a double-winding single-rotor motor, which 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) are 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 the first power switch element 10241, the negative output terminal of the first rectifier 1021 is connected to the positive output terminal of the second rectifier 1022 through the second power switch element 10242, the positive output terminal of the second rectifier 1022 is connected to the positive input terminal of the inverter 1023 through the third power switch element 10243, the negative output terminal of the second rectifier 1022 is connected to the negative input terminal of the inverter 1023, and the output terminal of the inverter 1023 is connected to the grid-connected transformer 103 through three-phase lines.
The switching states of the first power switch element 10241 and the third power switch element 10243 are identical, and the switching states of the second power switch element 10242 and the first power switch element 10241 are not identical, that is, when the first power switch element 10241 is turned on, the third power switch element 10243 is also turned on, and the second power switch element 10242 is turned off, or when the first power switch element 10241 is turned off, the third power switch element 10243 is also turned off, and the second power switch element 10242 is turned on. By controlling the switching states of the power components, the system has two working states of parallel connection (state 1, i.e., when the first power switch element 10241 and the third power switch element 10243 are turned on and the second power switch element 10242 is turned off) and series connection (state 2, i.e., when the second power switch element 10242 is turned on and the first power switch element 10241 and the third power switch element 10243 are turned off), and different functions of series boosting and parallel converging on the direct current side of the grid-connected system are realized by the action of the 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, and the inverter 1023 may be a full power inverter.
The first rectifier 1021 is used for generating a first direct current voltage signal Ud1 according to the first alternating current voltage signal U1 and generating a first direct current signal Id1 according to the first alternating current signal I1, the output power of the first rectifier 1021 is P1, and the work efficiency is eta1And then:
the second rectifier 1022 is used for generating a second dc voltage signal Ud1 according to the second ac voltage signal U2 and generating a second dc current signal Id2 according to the second ac current signal I2, the output power of the second rectifier 1022 is P2, and the operating efficiency is η2And then:
the first rectifier 1021 and the second rectifier 1022 are connected on the dc side, and further connected to the dc input terminal of the inverter 1023, the dc side of the inverter 1023 is inputted with the third dc voltage signal Ud3, and the side is inputted with the third dc current signal Id3, wherein the following two operation states can be realized based on the switching of the states of the power switch elements:
when the power switching element is in the first operating state, the first rectifier 1021 and the second rectifier 1022 are connected in series on the dc side, and the third dc voltage signal Ud3 and the third dc current signal Id3 can be obtained based on the following formulas:
Id3＝Id2＝Id1
when the power switching element is in the second operating state, the first rectifier 1021 and the second rectifier 1022 are connected in parallel on the dc side, and the third dc voltage signal Ud3 and the third dc current signal Id3 can be obtained based on the following 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 direct current signal U3 according to the third direct current signalId3 generates a third alternating current signal I3 the inverter 1023 inputs the third alternating voltage signal U3 and the third alternating current signal I3 to the grid-tie 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 series-parallel switching 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 through a first power switch element, the output negative end of the first rectifier is connected with the output positive end of the second rectifier through a second power switch element, the output positive end of the second rectifier is connected with the input positive end of the inverter through a third power switch element, the output negative end of the second rectifier is connected with the input negative end of the inverter, the output of the inverter is connected to the grid-connected transformer, the switching states of the first and third power switching elements are identical, the switching states of the second and third power switching elements are not identical, the first rectifier is configured to generate a first direct current voltage signal Ud1 from a first alternating current signal U1 and a first direct current signal Id1 from a first alternating current signal I1, the second rectifier is configured to generate a direct current signal Ud1 from a second alternating current signal U2 and a second direct current signal Id2 from a second alternating current signal I2, the inverter is configured to generate a third alternating current signal U3 from the third direct current voltage signal Ud3, generate a third alternating current signal I3 from the third direct current signal Id3 and input the third alternating current signal Ud3 and the third alternating current signal I3 to the grid-connected transformer, wherein the third direct current voltage signal Ud3 is based on the first direct current signal Ud1 and/or the second direct current signal Id 1/or the second direct current signal I3 The signal Ud2 is obtained and the third direct current signal Id3 is obtained from the first direct current signal Id1 and/or the second direct current signal Id 2. The single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system provided by the embodiment of the application comprises a change-over switch consisting of power electronic power switch elements, different functions of series connection boosting and parallel connection converging of a direct-current side of the grid-connected system are realized through the action of the change-over switch according to the requirement of the grid-connected system, the system can work in a direct-current side series mode and a direct-current side parallel mode according to different working states of the change-over switch, the direct-current bus voltage grade of a system current conversion system can be improved, or the output power of the system is increased through converging current on the basis of unchanged direct-current side voltage of the system current conversion system. The semiconductor switch device can reduce the loss caused by mechanical switching, reduce the volume and weight of the system and improve the response speed. The number of the grid-side converters is reduced from two to one, so that the weight and the cost of equipment are reduced, the line loss of a 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 (8)
1. The utility model provides a single wind wheel duplex winding motor direct current series-parallel connection switches unified and is incorporated into power networks system which characterized in that includes: the wind turbine comprises a wind turbine and a motor, the three-port converter comprises a first rectifier, a second rectifier, an inverter and power switching elements, and the power switching elements comprise a first power switching element, a second power switching element and a third power switching element;
the wind wheel is connected with the motor, and 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 the first rectifier and the input end of the second rectifier, the positive output terminal of the first rectifier is connected to the positive input terminal of the inverter, the negative output terminal of the first rectifier is connected to the negative input terminal of the inverter through the first power switching element, the negative output terminal of the first rectifier is connected with the positive output terminal of the second rectifier through the second power switch element, the positive output terminal of the second rectifier is connected with the positive input terminal of the inverter through the third power switching element, the output negative end of the second rectifier is connected with the input negative end of the inverter, the output end of the inverter is connected with the grid-connected transformer, the switching states of the first power switching element and the third power switching element are consistent, and the switching states of the second power switching element and the first power switching element are inconsistent;
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 direct current voltage signal Ud1 according to the second alternating current voltage 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 voltage signal U3 according to a third direct current voltage signal Ud3, generating a third alternating current signal I3 according to a third direct current signal Id3, and inputting the third alternating current voltage signal Ud3 and the third alternating current signal I3 to the grid-connected transformer, wherein the third direct current voltage signal Ud3 is obtained according to the first direct current voltage signal Ud1 and/or the second direct current voltage signal Ud2, and the third direct current signal Id3 is obtained according to the first direct current signal Id1 and/or the second direct current signal Id 2.
2. The single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system according to claim 1, wherein the power switching element is a transistor or a thyristor.
3. The single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system according to claim 1, wherein the motor is a permanent magnet synchronous generator.
4. The single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system according to claim 1, wherein the motor is a double-winding single-rotor motor.
5. The single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system according to claim 1, wherein the first rectifier is a full-power rectifier.
6. The single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system according to claim 1, wherein the second rectifier is a full-power rectifier.
7. The single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system according to claim 1, wherein the inverter is a full-power inverter.
8. The single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system according to claim 1, wherein the wind wheel is a three-blade wind wheel.
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| CN109372698A (en) * | 2018-10-18 | 2019-02-22 | 明阳智慧能源集团股份公司 | A kind of wind generator system |
| WO2021035571A1 (en) * | 2019-08-28 | 2021-03-04 | 华为技术有限公司 | Inverter of photovoltaic grid-connected power generation system, starting device and method, and system |
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