CN114123308B - DC series-parallel switching unified grid-connected system of single wind wheel double winding motor - Google Patents
DC series-parallel switching unified grid-connected system of single wind wheel double winding motor Download PDFInfo
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- CN114123308B CN114123308B CN202111250402.3A CN202111250402A CN114123308B CN 114123308 B CN114123308 B CN 114123308B CN 202111250402 A CN202111250402 A CN 202111250402A CN 114123308 B CN114123308 B CN 114123308B
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- 238000004804 winding Methods 0.000 title claims abstract description 31
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract description 11
- 230000004044 response Effects 0.000 abstract description 4
- 230000009471 action Effects 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
Abstract
The application provides a single wind wheel duplex winding motor direct current series-parallel connection switches unification 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 switching element in the converter. 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 voltage level of a direct current bus of the system converter system can be improved, or the output power of the system can be increased by collecting current on the basis that the voltage of the direct current side of the system converter system is unchanged. The power switch device can reduce the loss caused by a mechanical switch, reduce the volume and weight of the system and improve the response speed. The grid-side converter is reduced from two to one, so that the equipment weight and the cost are reduced, the system line loss is reduced, the system control complexity is reduced, and the grid-connected power generation efficiency of the system is improved.
Description
Technical Field
The application relates to the technical field of wind power generation, in particular to a direct current series-parallel switching unified grid-connected system of a single wind wheel double-winding motor.
Background
In recent years, the annual growth rate of the global renewable energy source is 25%, the utilization of renewable energy sources is dominant in the power industry, and the power generation proportion of non-hydraulic renewable energy sources is doubled. Wind power generation is used as renewable energy power generation which is the most mature technology except hydroelectric power generation, the installed capacity of the renewable energy power generation is the vast majority of the total capacity of the whole renewable energy power generation installed machine, but the limitation of the performance of power electronic devices causes a certain bottleneck for the development and the application of a large-capacity wind turbine generator, and how to reasonably construct a grid-connected system becomes a problem to be solved in the industry.
Disclosure of Invention
The present application aims to solve, at least to some extent, one of the technical problems in the related art.
Therefore, a first object of the present application is to provide a dc series-parallel switching unified grid-connected system of a single wind wheel double winding motor, so as to improve the output power of the system, reduce the loss caused by mechanical switches, reduce the volume and weight of the system, improve the response speed, reduce the weight and cost of equipment, reduce the line loss of the system, reduce the control complexity of the system, and improve the grid-connected power generation efficiency of the system.
In order to achieve the above objective, an embodiment of a first aspect of the present application provides a dc series-parallel switching unified grid-connected system of a single wind wheel double winding motor, including: the wind turbine comprises a wind wheel and a motor, wherein the three-port converter comprises a first rectifier, a second rectifier, an inverter and a power switching element, and the power switching element comprises 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 voltage signal U1, a first alternating current signal I1, a second alternating 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 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 through the first power switch element, the output negative end of the first rectifier is connected with the output positive end of the second rectifier through the second power switch element, the output positive end of the second rectifier is connected with the input positive end of the inverter through the third power switch 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 switch states of the first power switch element and the third power switch element are consistent, and the switch states of the second power switch element and the first power switch 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 voltage 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 the third direct current voltage signal Ud3 and generating a third alternating current signal I3 according to a third direct current signal Id3, and the third alternating current voltage signal Ud3 and the third alternating current signal I3 are input to the grid-connected transformer, wherein the third direct current voltage signal Ud3 is obtained according to the first direct current voltage signal Ud1 and/or the second direct current voltage signal Ud2, and the third direct current signal Id3 is obtained according to the first direct current signal Id1 and/or the second direct current signal Id 2.
The single wind wheel double-winding motor direct current series-parallel switching unified grid-connected system provided by the embodiment of the application, a wind wheel is connected with a motor, the motor is used for outputting a first alternating voltage signal U1, a first alternating current signal I1, a second alternating 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 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, 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 a first alternating current voltage signal U1 and generating a first direct current signal Id1 according to a first alternating current signal I1, the second rectifier is used for generating a direct current voltage signal Ud1 according to a second alternating current voltage 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 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, 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. According to the single wind wheel double winding motor direct current series-parallel connection switching unified grid-connected system, the power electronic power switch element forms the switch, different functions of series boosting and parallel converging on the direct current side of the grid-connected system are realized through actions of the switch 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 switch, the voltage level of a direct current bus of a system current transformation system can be improved, or the output power of the system is increased through converging current on the basis that the voltage of the direct current side of the current transformation system is unchanged. The semiconductor switching device can reduce the loss caused by mechanical switching, reduce the volume and weight of the system and improve the response speed. The grid-side converter is reduced from two to one, so that the equipment weight and the cost are reduced, the system line loss is reduced, the system control complexity is reduced, and the grid-connected power generation efficiency of the system is improved.
According to one embodiment of the present 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 present application, the motor is a dual winding single rotor motor.
According to one embodiment of the present application, the first rectifier is a full power rectifier.
According to one embodiment of the present 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 present application, the wind wheel is a three-bladed wind wheel.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a dc series-parallel switching unified grid-connected system of a single wind wheel dual winding motor according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.
The following describes a direct current series-parallel switching unified grid-connected system of a single wind wheel double winding motor in the embodiment of the application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a dc series-parallel switching unified grid-connected system of a single wind wheel double winding motor according to an embodiment of the present application, as shown in fig. 1, the dc series-parallel switching unified grid-connected system of the single wind wheel double winding motor of the embodiment of the present application may specifically include: fan 101, three-port current transformer 102 and grid-connected transformer 103, wherein:
the fan 101 includes a wind wheel 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 1024 may be a transistor or a thyristor, such as a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET, simply referred to as MOS transistor), and the MOS transistor may be an N-type MOS transistor or a P-type MOS transistor. The wind wheel 1011 may be a three-blade wind wheel, the motor 1012 may be a double-winding single-rotor motor, and may include a rotor, a first stator winding, and a second stator winding.
The wind wheel 1011 is connected with the motor 1012 (specifically, the wind wheel 1011 is connected with the rotor of the motor 1012), and the wind wheel 1011 rotates under the action of wind to drive the rotor of the motor 1012 to rotate. The motor 1012 is configured to output a first ac voltage signal U1 and a first ac current signal I1 at the first stator winding when the wind wheel 1011 drives the rotor of the motor 1012 to rotate; a second ac voltage signal U2 and a second ac current signal I2 are output at the second stator winding. Wherein the motor 1012 may be a permanent magnet synchronous generator.
The motor 1012 (specifically, a first stator winding and a second stator winding of the motor 1012) is connected to an input terminal of the first rectifier 1021 and an input terminal of the second rectifier 1022 through three-phase lines, an output positive terminal of the first rectifier 1021 is connected to an input positive terminal of the inverter 1023 through a direct current bus, an output negative terminal of the first rectifier 1021 is connected to an input negative terminal of the inverter 1023 through a first power switch element 10241, an output negative terminal of the first rectifier 1021 is connected to an output positive terminal of the second rectifier 1022 through a second power switch element 10242, an output positive terminal of the second rectifier 1022 is connected to an input positive terminal of the inverter 1023 through a third power switch element 10243, an output negative terminal of the second rectifier 1022 is connected to an input negative terminal of the inverter 1023, and an 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 switching element 10241 and the third power switching element 10243 are identical, and the switching states of the second power switching element 10242 and the first power switching element 10241 are not identical, i.e., when the first power switching element 10241 is turned on, the third power switching element 10243 is also turned on and the second power switching element 10242 is turned off, or when the first power switching element 10241 is turned off, the third power switching element 10243 is also turned off and the second power switching 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, namely, the first power switching element 10241 and the third power switching element 10243 are on, the second power switching element 10242 is off) and series connection (state 2, namely, the second power switching element 10242 is on, the first power switching element 10241 and the third power switching element 10243 are off), and different functions of series boosting and parallel confluence on the direct current side of the grid-connected system are realized through the action of a switch according to the requirements of the grid-connected system. The first rectifier 1021 may be a full-power rectifier, and 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 configured to generate a first direct current voltage signal Ud1 according to the first alternating current voltage signal U1, and generate a first direct current signal Id1 according to the first alternating current signal I1, where the first rectifier 1021 outputs power P1 with working efficiency η 1 Then:
the second rectifier 1022 is configured to generate a second dc voltage signal Ud1 according to the second ac voltage signal U2, and generate a second dc current signal Id2 according to the second ac current signal I2, where the second rectifier 1022 outputs power P2 with working efficiency η 2 Then:
the first rectifier 1021 and the second rectifier 1022 are connected on the dc side, and then are connected to the dc input terminal of the inverter 1023, the third dc voltage signal Ud3 is input to the dc side of the inverter 1023, and the third dc voltage signal Id3 is input to the dc side, wherein the following two working states can be realized based on the switching of the states of the power switching 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 formula:
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 formula:
Ud3＝Ud2＝Ud1
the inverter 1023 is configured to generate a third ac voltage signal U3 according to the third dc voltage signal Ud3, generate a third ac current signal I3 according to the third dc voltage signal Id3, and input the third ac voltage signal U3 and the third ac current signal I3 to the grid-connected transformer 103 by the inverter 1023. Alternatively, inverter 1023 has an operating efficiency η 3 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, a wind wheel is connected with a motor, the motor is used for outputting a first alternating voltage signal U1, a first alternating current signal I1, a second alternating 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 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, 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 a first alternating current voltage signal U1 and generating a first direct current signal Id1 according to a first alternating current signal I1, the second rectifier is used for generating a direct current voltage signal Ud1 according to a second alternating current voltage 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 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, 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. According to the single wind wheel double winding motor direct current series-parallel connection switching unified grid-connected system, the power electronic power switch element forms the switch, different functions of series boosting and parallel converging on the direct current side of the grid-connected system are realized through actions of the switch 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 switch, the voltage level of a direct current bus of a system current transformation system can be improved, or the output power of the system is increased through converging current on the basis that the voltage of the direct current side of the current transformation system is unchanged. The semiconductor switching device can reduce the loss caused by mechanical switching, reduce the volume and weight of the system and improve the response speed. The grid-side converter is reduced from two to one, so that the equipment weight and the cost are reduced, the system line loss is reduced, the system control complexity is reduced, and the grid-connected power generation efficiency of the system is improved.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (8)
1. The utility model provides a single wind wheel duplex winding motor direct current series-parallel connection switches unification grid-connected system which characterized in that includes: the wind turbine comprises a wind wheel and a motor, wherein the three-port converter comprises a first rectifier, a second rectifier, an inverter and a power switching element, and the power switching element comprises 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 voltage signal U1, a first alternating current signal I1, a second alternating 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 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 through the first power switch element, the output negative end of the first rectifier is connected with the output positive end of the second rectifier through the second power switch element, the output positive end of the second rectifier is connected with the input positive end of the inverter through the third power switch 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 switch states of the first power switch element and the third power switch element are consistent, and the switch states of the second power switch element and the first power switch element are inconsistent;
the first rectifier is configured to generate a first direct current voltage signal Ud1 according to the first alternating current voltage signal U1, and generate a first direct current signal Id1 according to the first alternating current signal I1;
the second rectifier is configured to generate a dc voltage signal Ud1 according to the second ac voltage signal U2, and generate 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 a third dc voltage signal Ud3, generate a third ac current signal I3 according to a 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, where 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 signal Id1 and/or the second dc signal Id 2.
2. The single wind wheel double winding motor direct current series-parallel connection switching unified grid connection system according to claim 1, wherein the power switch element is a transistor or a thyristor.
3. The single wind wheel double winding motor direct current series-parallel switching unified grid connection system according to claim 1, wherein the motor is a permanent magnet synchronous generator.
4. The single wind wheel double winding motor dc series-parallel switching unified grid connection system of claim 1, wherein the motor is a double winding single rotor motor.
5. The single wind wheel double winding motor dc series-parallel switching unified grid-connected system of claim 1, wherein the first rectifier is a full power rectifier.
6. The single wind wheel double winding motor dc series-parallel switching unified grid-connected system of claim 1, wherein the second rectifier is a full power rectifier.
7. The single wind wheel duplex 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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| RU2146849C1 (en) * | 1998-12-04 | 2000-03-20 | Волегов Виктор Евгеньевич | Overhung current generator |
| CN104242345A (en) * | 2014-09-22 | 2014-12-24 | 周细文 | High-power direct drive wind power converter circuit topological structure and application thereof |
| 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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