CN103647303B - A kind of double-fed wind generator current transformer Crowbar protective circuit and control method - Google Patents
A kind of double-fed wind generator current transformer Crowbar protective circuit and control method Download PDFInfo
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- CN103647303B CN103647303B CN201310684300.1A CN201310684300A CN103647303B CN 103647303 B CN103647303 B CN 103647303B CN 201310684300 A CN201310684300 A CN 201310684300A CN 103647303 B CN103647303 B CN 103647303B
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The invention discloses a kind of double-fed wind generator current transformer Crowbar protective circuit and control method, double-fed wind generator converter structure is made up of rotor-side converter, intermediate DC link and net side converter.The feature of Crowbar protective circuit is: three-phase bidirectional triode thyristor connects to form triangular structure successively; form Crowbar protective circuit after three corresponding end points serial connection three-phase protective resistance, the three-phase output end of Crowbar protective circuit is connected with the rotor-side converter three-phase alternating current output in double feedback electric engine converter structure.The present invention is controlled with coordinating of double fed electric machine rotor side converter brachium pontis switch by the controllable silicon in triangular structure; thus replace conventional wholly-controled device with the half control type device controllable silicon of low cost, high reliability and achieve active Crowbar protective circuit function; reduce the cost of Crowbar protective circuit; improve its reliability, ensure that the realization of the low voltage ride-through function of double-feedback aerogenerator.
Description
Technical field
The invention belongs to wind power generation field, especially double-fed wind generator current transformer Crowbar protective circuit.
Background technology
The stator winding of double-feedback aerogenerator is directly connected with electrical network, rotor windings is connected with electrical network by current transformer, its Converter Capacity is generally only about 30% of unit rated capacity, double feedback electric engine is made to possess the low advantage of cost, so be widely used in megawatt-grade high-power wind-driven generator, become the leading type of current wind-driven generator.But this special unsteady flow topological structure also makes this type comparatively responsive to the disturbance of line voltage simultaneously, its low voltage crossing runs also comparatively complicated.Along with the raising of wind-powered electricity generation electrical network penetrance, national associated mechanisms has put into effect standards and norms, requires that wind-driven generator must possess low voltage ride-through function, and this makes the low voltage crossing problem of double-fed wind generator current transformer become the hot issue of current research.
Existing low voltage crossing technology is divided into software and additional firmware two kinds of methods.The software control method not increasing additional hardware of current proposition is a lot, but all cannot reach the effect of practical application.And the method for additional firmware mainly contains rotor loop accessory hardware and stator loop additional firmware two class: rotor loop additional firmware method mainly refers in double fed electric machine rotor side configuration Crowbar protective circuit; Stator loop additional firmware method mainly comprises: series power electronic switch, series converter and set up the methods such as passive impedance network.
The method that rotor-side adds Crowbar protective circuit is current comparatively maturation and a kind of double-fed wind generator unit low voltage crossing technology (MorrenJ of commercialization, SjoerdWH.Ridethroughofwindturbineswithdoubly-fedinductio ngeneratorduringavoltagedip [J] .IEEETransacitonsonEnergyConversion, 2005,20 (2): 435-441; Xu Dianguo, Wang Wei, Chen Ning. based on double feedback electric engine wind energy turbine set low voltage crossing dynamic analysis [J] of crow bar protection. Proceedings of the CSEE, 2010,20 (22): 29-36; Week ties up, Sun Jinghua, Zhang Zhe etc. a kind of crowbar protecting device of double-feed wind-electricity converter [P], 200910072960; Zhang Kan, Zhu Ling, Zhou Qing etc. a kind of double-fed wind energy converter Crowbar protective device [P], 201120359510).Wherein, passive type Crowbar protective circuit is comparatively early for the hardware device of wind electric converter self-protection when electric network fault, but this self-protection mode cannot realize low voltage crossing.Along with the raising that wind-electricity integration requires, the active Crowbar protective circuit adopting the full control devices such as IGBT to form becomes one of technical method of research in recent years low voltage crossing.But the shock-resistant electric current of the height of motor makes the difficult design of the full control devices such as IGBT, cost higher under electric network fault, and during crow bar action, do not control state and the reactive power problem, electromagnetic torque shock problem etc. that cause make it be difficult to meet increasingly harsh wind-electricity integration directive/guide because DFIG is in.
Summary of the invention
The present invention is the deficiency for avoiding existing for above-mentioned prior art; a kind of cost is low, structure is simple, reliability is high double-fed wind generator current transformer Crowbar protective circuit and control method are provided, thus achieve with half control type device controllable silicon conventional entirely to control the active Crowbar protective circuit function that device could realize.
Object of the present invention can adopt following technical scheme to be realized:
The invention provides a kind of double-fed wind generator current transformer Crowbar protective circuit; double-fed wind generator converter structure is made up of rotor-side converter, intermediate dc ring and net side converter; the triangular structure serial connection three-phase protective resistance that Crowbar protective circuit is connected to form successively by three-phase bidirectional triode thyristor is formed, and the three-phase output end of Crowbar protective circuit is connected with rotor-side converter three-phase alternating current output.
Preferably, in described three-phase bidirectional triode thyristor part, be often bidirectional triode thyristor device (TRIAC) mutually;
Preferably, in described three-phase bidirectional triode thyristor part, often for being two controllable silicon inverse parallel compositions;
Described triangular structure comprises other circuit structure with equivalent electric property.
Present invention also offers a kind of control method of double-fed wind generator current transformer Crowbar protective circuit, the method can realize active Crowbar protective circuit function with controllable silicon, and concrete steps are as follows:
1) double fed electric machine rotor three-phase current i is detected in real time
a, i
b, i
c;
2) the above-mentioned rotor three-phase electric current detected is compared with the protection value of setting, if be greater than the protection value of setting, trigger three-phase bidirectional triode thyristor in triangular structure, thus double fed electric machine rotor winding is formed loop, with the transient current of bypass double fed electric machine rotor by Crowbar protective circuit;
3) decay to the reference value of setting at rotor transient current after, by the i detected
a, i
b, i
cjudge the respective regions residing for electric current, region I: i
a> 0, i
b≤ 0, i
c< 0; Region II: i
a>=0, i
b> 0, i
c< 0; Region III: i
a< 0, i
b> 0, i
c≤ 0; Region IV: i
a< 0, i
b>=0, i
c> 0; Region V: i
a≤ 0, i
b< 0, i
c> 0; Region VI: i
a> 0, i
b< 0, i
c>=0;
4) by judging the region at electric current place, by the controllable silicon label of six in three-phase bidirectional triode thyristor be 1. ~ 6., the controllable silicon of the corresponding conducting of known zones of different: in region I 2. and 5. conducting; In region II 4. and 5. conducting; In region III 1. and 4. conducting; In region IV 1. and 6. conducting; In region V 3. and 6. conducting; In region VI 2. and 3. conducting;
5) by the switching tube action on brachium pontis corresponding in rotor-side converter, force the pass break is carried out to the corresponding controllable silicon being in conducting state, switch on rotor-side converter is expressed as V1 ~ V6, mechanism is turned off according to silicon controlled, then when being in region I, controllable silicon just can be forced 2. and 5. to turn off by opening V1, V4, V6; When being in region II, controllable silicon just can be forced 4. and 5. to turn off by opening V1, V3, V6; When being in region III, controllable silicon just can be forced 1. and 4. to turn off by opening V2, V3, V6; When being in region IV, controllable silicon just can be forced 1. and 6. to turn off by opening V2, V3, V5; When being in region V, controllable silicon just can be forced 3. and 6. to turn off by opening V2, V4, V5; When being in region VI, controllable silicon just can be forced 2. and 3. to turn off by opening V1, V4, V5.
By above-mentioned control method, achieve the conventional active Crowbar protective circuit function that could realize with wholly-controled device with half control type device bidirectional triode thyristor.
The present invention is by the improvement to traditional C rowbar protective circuit; three-phase protective resistance composition Crowbar protective circuit is connected in series after three-phase controllable silicon being formed triangular structure; the action of rotor-side converter switching tube can be utilized to implement low cost, highly reliable active Crowbar function to silicon controlled forced commutation in Crowbar protective circuit; compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention adopts the half control type power electronic device controllable silicon of low cost, high reliability to achieve the function of active Crowbar protective circuit;
2, topological structure cost of the present invention is low, reliability is high, structure is simple, can be widely used in the low voltage crossing of double-feedback aerogenerator.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of double-fed wind generator current transformer of the present invention Crowbar protective circuit.
Fig. 2 is the partial enlarged drawing of Fig. 1.
Fig. 3 is the control method rotor three-phase current administrative division map of a kind of double-fed wind generator current transformer of the present invention Crowbar protective circuit.
To be double feedback electric engine falling the Crowbar protective circuit three-phase current waveform under the symmetrical electric network fault that the degree of depth is 80% to Fig. 4.
Embodiment
See Fig. 1,2; in the present embodiment; double-fed wind generator converter structure adopts and is made up of rotor-side converter, intermediate DC link and net side converter; the triangular structure serial connection three-phase protective resistance that Crowbar protective circuit is connected to form successively by three-phase bidirectional triode thyristor is formed, and the three-phase output end of Crowbar protective circuit is connected with rotor-side converter three-phase alternating current output.
In concrete enforcement, in three-phase bidirectional triode thyristor part, often mutually for bidirectional triode thyristor device (TRIAC) or be two controllable silicon inverse parallels compositions, three-phase protective resistance is non-vanishing.
Realize active Crowbar protective circuit function, concrete steps are:
1) current transformer is utilized to detect double fed electric machine rotor three-phase current i in real time
a, i
b, i
c.
2) compared with the protection value of setting by the rotor current detected, in the present embodiment, the setting of protection value is to ensure that rotor current does not damage premised on rotor-side converter, is taken as 2 times of load current value.
3) if rotor current is greater than the protection value of setting; by sending triggering signal; trigger three-phase bidirectional triode thyristor in triangular structure; thus double fed electric machine rotor winding is formed loop by Crowbar protective circuit; with the transient current of bypass double fed electric machine rotor; because the existence of the protective resistance in Crowbar protective circuit, the transient current of rotor can be decayed very soon.
4) decay to the reference value of setting at rotor transient current after, by the i detected
a, i
b, i
cjudge the respective regions residing for electric current, concrete outcome is: region I: i
a> 0, i
b≤ 0, i
c< 0; Region II: i
a>=0, i
b> 0, i
c< 0; Region III: i
a< 0, i
b> 0, i
c≤ 0; Region IV: i
a< 0, i
b>=0, i
c> 0; Region V: i
a≤ 0, i
b< 0, i
c> 0; Region VI: i
a> 0, i
b< 0, i
c>=0.Concrete condition can see Fig. 3.
5) by judging the region at electric current place, by the controllable silicon label of six in three-phase bidirectional triode thyristor be 1. ~ 6., the controllable silicon of the corresponding conducting of known zones of different: in region I 2. and 5. conducting; In region II 4. and 5. conducting; In region III 1. and 4. conducting; In region IV 1. and 6. conducting; In region V 3. and 6. conducting; In region VI 2. and 3. conducting.
6) by the switching tube action on brachium pontis corresponding in rotor-side converter, force the pass break is carried out to the corresponding controllable silicon being in conducting state.Switch on rotor-side converter is expressed as V1 ~ V6, turns off mechanism according to silicon controlled, then, when being in region I, controllable silicon just can be forced 2. and 5. to turn off by opening V1, V4, V6; When being in region II, controllable silicon just can be forced 4. and 5. to turn off by opening V1, V3, V6; When being in region III, controllable silicon just can be forced 1. and 4. to turn off by opening V2, V3, V6; When being in region IV, controllable silicon just can be forced 1. and 6. to turn off by opening V2, V3, V5; When being in region V, controllable silicon just can be forced 3. and 6. to turn off by opening V2, V4, V5; When being in region VI, controllable silicon just can be forced 2. and 3. to turn off by opening V1, V4, V5.
7) to be double feedback electric engine falling the Crowbar protective circuit three-phase current waveform under the symmetrical electric network fault that the degree of depth is 80% to Fig. 4; as can be seen from the figure after dropping into Crowbar protective circuit a period of time; by the action of the switching tube of rotor-side converter brachium pontis; achieve the silicon controlled force the pass break to conducting in Crowbar protective circuit; and then by this control method, achieve conventional entirely to control the active Crowbar protective circuit function that device could realize with half control type device controllable silicon.
Claims (2)
1. the control method of a double-fed wind generator current transformer Crowbar protective circuit, it is characterized in that: double-fed wind generator converter structure is made up of rotor-side converter, intermediate DC link and net side converter, it is characterized in that: the triangular structure serial connection three-phase protective resistance that Crowbar protective circuit is connected to form successively by three-phase bidirectional triode thyristor is formed, and the three-phase output end of Crowbar protective circuit is connected with rotor-side converter three-phase alternating current output;
In described three-phase bidirectional triode thyristor part, be often bidirectional triode thyristor device (TRIAC) mutually;
In described three-phase bidirectional triode thyristor part, be often two controllable silicon inverse parallel compositions mutually;
This method can realize active Crowbar protective circuit function with controllable silicon, and concrete steps are as follows:
1) double fed electric machine rotor three-phase current i is detected in real time
a, i
b, i
c;
2) the above-mentioned rotor three-phase electric current detected is compared with the protection value of setting, if be greater than the protection value of setting, trigger three-phase bidirectional triode thyristor in triangular structure, thus double fed electric machine rotor winding is formed loop, with the transient current of bypass double fed electric machine rotor by Crowbar protective circuit;
3) decay to the reference value of setting at rotor transient current after, by the i detected
a, i
b, i
cjudge the respective regions residing for electric current, region I: i
a> 0, i
b≤ 0, i
c< 0; Region II: i
a>=0, i
b> 0, i
c< 0; Region III: i
a< 0, i
b> 0, i
c≤ 0; Region IV: i
a< 0, i
b>=0, i
c> 0; Region V: i
a≤ 0, i
b< 0, i
c> 0; Region VI: i
a> 0, i
b< 0, i
c>=0;
4) by judging the region at electric current place, by the controllable silicon label of six in three-phase bidirectional triode thyristor be 1. ~ 6., the controllable silicon of the corresponding conducting of known zones of different: in region I 2. and 5. conducting; In region II 4. and 5. conducting; In region III 1. and 4. conducting; In region IV 1. and 6. conducting; In region V 3. and 6. conducting; In region VI 2. and 3. conducting;
5) by the switching tube action on brachium pontis corresponding in rotor-side converter, force the pass break is carried out to the corresponding controllable silicon being in conducting state, switch on rotor-side converter is expressed as V1 ~ V6, mechanism is turned off according to silicon controlled, then when being in region I, controllable silicon just can be forced 2. and 5. to turn off by opening V1, V4, V6; When being in region II, controllable silicon just can be forced 4. and 5. to turn off by opening V1, V3, V6; When being in region III, controllable silicon just can be forced 1. and 4. to turn off by opening V2, V3, V6; When being in region IV, controllable silicon just can be forced 1. and 6. to turn off by opening V2, V3, V5; When being in region V, controllable silicon just can be forced 3. and 6. to turn off by opening V2, V4, V5; When being in region VI, controllable silicon just can be forced 2. and 3. to turn off by opening V1, V4, V5.
2. the control method of a kind of double-fed wind generator current transformer Crowbar protective circuit according to claim 1, is characterized in that: described triangular structure comprises other circuit structure with equivalent electric property.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101651330A (en) * | 2009-09-23 | 2010-02-17 | 哈尔滨九洲电气股份有限公司 | Crowbar protecting device of double-feed wind-electricity converter |
| CN203933037U (en) * | 2013-12-13 | 2014-11-05 | 合肥工业大学 | A kind of double-fed wind generator current transformer Crowbar protective circuit |
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| JP2006025549A (en) * | 2004-07-08 | 2006-01-26 | Tokyo Electric Power Co Inc:The | Power supply device and power system equipped with the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101651330A (en) * | 2009-09-23 | 2010-02-17 | 哈尔滨九洲电气股份有限公司 | Crowbar protecting device of double-feed wind-electricity converter |
| CN203933037U (en) * | 2013-12-13 | 2014-11-05 | 合肥工业大学 | A kind of double-fed wind generator current transformer Crowbar protective circuit |
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