CN104201717A - Permanent magnet direct-driven wind power system - Google Patents
Permanent magnet direct-driven wind power system Download PDFInfo
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- CN104201717A CN104201717A CN201410435944.1A CN201410435944A CN104201717A CN 104201717 A CN104201717 A CN 104201717A CN 201410435944 A CN201410435944 A CN 201410435944A CN 104201717 A CN104201717 A CN 104201717A
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- permanent magnet
- power system
- wind power
- magnet direct
- filter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention provides a permanent magnet direct-driven wind power system which comprises a wind generator, a permanent magnet synchronous generator connected with the wind generator, a diode rectifier and a grid connected transformer and further comprises an LC filter device and a Z source inverter. The problems that alternating-current load of a grid connected traditional voltage source type inverter of a traditional voltage source type PWM inversion device, often adopted by an existing permanent magnet direct-driven wind power system, can be only inductive load, the traditional voltage source type inverter is a voltage reduction type inverter so that alternating-current output voltage can be only lower than direct-current bus voltage, synchronous breakover of an upper switch tube and a lower switch tube on the same bridge arm is not permitted by the traditional voltage source type inverter, the machine-side current harmonic problem is caused by three-phase uncontrollable rectification, and other limitations and problems solved. Compared with a permanent magnet direct-driven wind power system adopting the traditional voltage source type PWM inversion device, the permanent magnet direct-driven wind power system is wide in application range and efficient in use.
Description
Technical field
The present invention relates to power field, particularly a kind of permanent magnet direct-drive wind power system.
Background technology
Wind energy, as a kind of clean regenerative resource, is more and more subject to the attention of countries in the world; Utilize wind power generation to utilize the major way of wind energy for various countries.
At present, the generating of permanent magnet direct-drive wind-force is one of existing wind power generation major way of China; But existing permanent magnet direct-drive wind generator system adopts traditional electrical potential source type PWM convertor assembly grid-connected more, it has following limitation and deficiency: first, the AC load of traditional electrical potential source type inverter can only be inductive load; Secondly, traditional electrical potential source type inverter is a kind of buck inverter, and ac output voltage can only be lower than DC bus-bar voltage.Lower for DC bus, but the power conversion occasion of the higher ac output voltage of needs just needs extra boost chopper, and this will increase system cost, reduce transducer effciency; Finally, traditional electrical potential source type inverter does not allow two switching tube conductings simultaneously up and down of same brachium pontis, otherwise, can be because straight-through overcurrent burns device.
Summary of the invention
Main purpose of the present invention is to provide a kind of permanent magnet direct-drive wind power system, utilizes this permanent magnet direct-drive wind power system to solve existing permanent magnet direct-drive wind generator system and adopts the traditional electrical potential source type grid-connected limitation of PWM convertor assembly and deficiency more.
The invention provides a kind of permanent magnet direct-drive wind power system, the magneto alternator, diode rectifier and the grid-connected transformer that include blower fan, be connected with described blower fan, also include LC filter and Z-source inverter; Described LC filter is connected with described magneto alternator and described diode rectifier, and described Z-source inverter is connected with described diode rectifier and described grid-connected transformer.
Further, described blower fan is mechanical energy by wind energy transformation; The mechanical energy of described blower fan is converted into electric energy by described magneto alternator, and with extremely described LC filter of three-phase electricity formal output.
Further, state LC filter and include three filter inductances and three filter capacitors; Described filter capacitor neutral earthing.
Further, described three-phase electricity is inputted in described diode rectifier through after the filtering of described LC filter and compensation.
Further, described three-phase electricity forms direct current and inputs in described Z-source inverter after the uncontrollable rectification of three-phase of described diode rectifier.
Further, described Z-source inverter comprises Z source network and three-phase inverter.
Further, described direct current forms in the described grid-connected transformer of sinusoidal wave three-phase electricity input after the conversion of described Z-source inverter.
Further, described sinusoidal wave three-phase electricity is inputted in three phase network after described grid-connected transformer transformation.
Beneficial effect of the present invention is, a kind of permanent magnet direct-drive wind power system is provided, and has solved existing permanent magnet direct-drive wind generator system and has adopted grid-connected limitation and the deficiency of traditional electrical potential source type PWM convertor assembly more; The AC load that has solved traditional electrical potential source type inverter can only be the problem of inductive load; Having solved traditional electrical potential source type inverter is a kind of buck inverter, ac output voltage can only be lower than DC bus-bar voltage, lower for DC bus, if need the power conversion occasion of higher ac output voltage, just need extra boost chopper, this will increase system cost, reduce the problems such as transducer effciency; Solve the problem such as two switching tube conductings simultaneously up and down that traditional electrical potential source type inverter does not allow same brachium pontis, solved the problem of the pusher side current harmonics being caused by the uncontrollable rectification of three-phase; The present invention is than the permanent magnet direct-drive wind generator system range of application of existing employing traditional electrical potential source type PWM convertor assembly is more extensive and use is more efficient.
Brief description of the drawings
Figure 1 shows that the system configuration schematic diagram of the invention process permanent magnet direct-drive wind power system.
Embodiment
Below describe embodiments of the invention in detail in connection with accompanying drawing.It should be noted in the discussion above that what the combination of the technical characterictic described in following embodiment or technical characterictic should not be considered to isolate, thereby they can mutually be combined and be mutually combined and are reached better technique effect.In the accompanying drawing of following embodiment, the same numeral that each accompanying drawing occurs represents identical feature or parts, can be applicable in different embodiment.
Figure 1 shows that the system configuration schematic diagram of the invention process permanent magnet direct-drive wind power system.
A kind of permanent magnet direct-drive wind power system of embodiments of the invention, the magneto alternator M, diode rectifier and the grid-connected transformer that include blower fan F, be connected with described blower fan, also include LC filter and Z-source inverter; Described LC filter is connected with described magneto alternator and described diode rectifier, and described Z-source inverter is connected with described diode rectifier and described grid-connected transformer.
Blower fan F is mechanical energy by wind energy transformation; The mechanical energy of described blower fan F is converted into electric energy by described magneto alternator M, and with extremely described LC filter of three-phase electricity formal output.
Described LC filter includes L3, L4, tri-filter inductances of L5 and C3, C4, tri-filter capacitors of C5; The neutral earthing of described filter capacitor;
Described three-phase electricity is inputted in described diode rectifier through after the filtering of described LC filter and compensation; Described diode rectifier includes D1, D2, D3, D4, D5, six diodes of D6.
Described three-phase electricity forms direct current and inputs in described Z-source inverter after the uncontrollable rectification of three-phase of described diode rectifier.
Described Z-source inverter includes Z source network and three-phase inverter; Described Z source network comprises L1, bis-inductance of L2 and C1, C2 second elder brother's electric capacity; Described three-phase inverter comprises G1, G2, G3, G4, G5, six triodes of G6.
Described direct current forms in the described grid-connected transformer of sinusoidal wave three-phase electricity input after the conversion of described Z-source inverter; Described grid-connected transformer includes L6, L7, tri-inductance of L8.
Described sinusoidal wave three-phase electricity is inputted in three phase network after described grid-connected transformer transformation
Below will describe technical scheme of the present invention in detail:
The design of LC filter: LC filter is made up of three-phase filter reactance and three-phase filter capacitor.Wherein filter capacitor mid point is connected with the earth (casing), and object is that the common-mode voltage component that filter is produced inverter also plays filter action, to reduce to be applied to the common-mode voltage on motor terminal.The performance of filter mainly determines by the resonance frequency between filter reactance and filter capacitor, and LC resonance frequency is to be determined by the product of filter reactance and filter capacitor, determining that after resonance frequency, the parameter of filter reactance and filter capacitor also needs to determine respectively.Design parameter designs except considering the volume and cost of reactor and capacitor, also will consider their impacts on device performance, this mainly comprises that LC filter is on the factor such as self-excitation voltage and LC resonance between set end voltage and output current impact, filter capacitor and motor.
The setting of straight-through duty ratio: the straight-through duty ratio of Z-source inverter realizes by inserting straight-through zero vector, and the method for implanting of straight-through zero vector comprises: simple boosting rectifier control method, improvement PWM method and maximum gain control method.This patent by tradition in same sector effectively when vector, non-straight-through traditional zero vector and straight-through zero vector state the equivalent electric circuit of system analyze, the non-zero-time that draws input current in the time of the effective vector of tradition, non-straight-through traditional zero vector has been widened, thereby has reduced current harmonics.And DC link exchanges link with pusher side and is spaced when straight-through zero vector, current waveform distorts.Hence one can see that, and wish reduces pusher side current harmonics, improves power factor, and the modulation factor of many raising inverters of should trying one's best, avoids too much using Z source network to boost.
The design of Z source network inductance value: will consider the Z-source inverter non-normal working that current ripples size, the high/low subharmonic of inductive current and inductance cause when too small when Z source network inductance value determining.This patent carries out modeling analysis by the permanent magnet direct-drive wind generator system to Z-source inverter and show that (this inductance value must meet above-mentioned condition in the time that Z source network inductance is got certain value, in valid interval), can make the variation of pusher side electric current only relevant with motor phase voltage, success solves the non-linear relation of pusher side electric current and pusher side voltage, reduce pusher side current harmonics, improved power factor
The present invention than the permanent magnet direct-drive wind generator system of existing employing traditional electrical potential source type PWM convertor assembly more efficiently, more safety and range of application wider; Z-source inverter has solved some limitations and the shortcoming of traditional electrical potential source type inverter; But what adopt due to permanent magnet direct-drive wind power system rectification side based on Z-source inverter is the uncontrollable rectification of three-phase, and the current harmonics of pusher side becomes the principal element of restriction Z-source inverter application; For this problem, the present invention, from affecting the angle of the different voltages of generator sector curent change, forms the method for the permanent magnet direct-drive wind power system pusher side power factor correction based on Z-source inverter.
Although provided some embodiments of the present invention herein, it will be understood by those of skill in the art that in the situation that not departing from spirit of the present invention, can change embodiment herein.Above-described embodiment is exemplary, restriction that should be using embodiment herein as interest field of the present invention.
Claims (8)
1. a permanent magnet direct-drive wind power system, the magneto alternator, diode rectifier and the grid-connected transformer that include blower fan, be connected with described blower fan, is characterized in that:
Also include LC filter and Z-source inverter; Described LC filter is connected with described magneto alternator and described diode rectifier, and described Z-source inverter is connected with described diode rectifier and described grid-connected transformer.
2. permanent magnet direct-drive wind power system as claimed in claim 1, is characterized in that, described blower fan is mechanical energy by wind energy transformation; The mechanical energy of described blower fan is converted into electric energy by described magneto alternator, and with extremely described LC filter of three-phase electricity formal output.
3. permanent magnet direct-drive wind power system as claimed in claim 1, is characterized in that, described LC filter includes three filter inductances and three filter capacitors, described filter capacitor neutral earthing.
4. the permanent magnet direct-drive wind power system as described in claim 1 and 2, is characterized in that, described three-phase electricity is inputted in described diode rectifier through after the filtering of described LC filter and compensation.
5. permanent magnet direct-drive wind power system as claimed in claim 4, is characterized in that, described three-phase electricity forms direct current and inputs in described Z-source inverter after the uncontrollable rectification of three-phase of described diode rectifier.
6. permanent magnet direct-drive wind power system as claimed in claim 1, is characterized in that, described Z-source inverter includes Z source network and three-phase inverter.
7. permanent magnet direct-drive wind power system as claimed in claim 5, is characterized in that, described direct current forms the described grid-connected transformer of sinusoidal wave three-phase electricity input after the conversion of described Z-source inverter.
8. permanent magnet direct-drive wind power system as claimed in claim 7, is characterized in that, described sinusoidal wave three-phase electricity is inputted in three phase network after described grid-connected transformer transformation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410435944.1A CN104201717A (en) | 2014-09-01 | 2014-09-01 | Permanent magnet direct-driven wind power system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410435944.1A CN104201717A (en) | 2014-09-01 | 2014-09-01 | Permanent magnet direct-driven wind power system |
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| CN104201717A true CN104201717A (en) | 2014-12-10 |
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| CN201410435944.1A Pending CN104201717A (en) | 2014-09-01 | 2014-09-01 | Permanent magnet direct-driven wind power system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734551A (en) * | 2015-03-19 | 2015-06-24 | 南京航空航天大学 | Isolated type Z-source inverter |
| CN108429469A (en) * | 2018-02-09 | 2018-08-21 | 东北电力大学 | The sources Z dual stage matrix converter modulator approach based on Carrier-based PWM |
| CN111213311A (en) * | 2017-10-13 | 2020-05-29 | 纳博特斯克有限公司 | AC-AC converter circuit |
| RU2742889C1 (en) * | 2019-12-26 | 2021-02-11 | Юлий Борисович Соколовский | Method of electric power supply for autonomous consumers by wind power devices |
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| CN103259286A (en) * | 2013-05-06 | 2013-08-21 | 安徽理工大学 | Three-level Z source wind power generation grid-connected system |
| CN103401267A (en) * | 2013-07-17 | 2013-11-20 | 天津大学 | Grid-connected circuit for small-sized wind-driven generator |
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| CN101051793A (en) * | 2007-05-21 | 2007-10-10 | 哈尔滨九洲电气股份有限公司 | Megawatt direct driving type wind and electric joint-net current transformer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734551A (en) * | 2015-03-19 | 2015-06-24 | 南京航空航天大学 | Isolated type Z-source inverter |
| CN111213311A (en) * | 2017-10-13 | 2020-05-29 | 纳博特斯克有限公司 | AC-AC converter circuit |
| CN111213311B (en) * | 2017-10-13 | 2023-12-22 | 纳博特斯克有限公司 | AC-AC converter circuit |
| CN108429469A (en) * | 2018-02-09 | 2018-08-21 | 东北电力大学 | The sources Z dual stage matrix converter modulator approach based on Carrier-based PWM |
| RU2742889C1 (en) * | 2019-12-26 | 2021-02-11 | Юлий Борисович Соколовский | Method of electric power supply for autonomous consumers by wind power devices |
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Effective date of registration: 20151118 Address after: 410082 Mount Yuelu, Hunan, Changsha Applicant after: Hunan University Address before: 3, 7, 702, Yuelu District excellence Park community, Changsha, Hunan Applicant before: Huang Shoudao |
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Application publication date: 20141210 |