基于有限元模型的双馈感应发电机绕组匝间短路故障特性分析

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1、华北电力大学硕士学位论文摘要AbstractWithitsadvantageslikewidespeedrange,flexiblecontrolstrategy,independentpoweradjustingandhighcost-effective,etc,doublyfedinductiongenerator(DFIG)iswidelyusedinwindpowergeneration.Duetopoorworkingconditionsofthewindfarmanditscomplexstructure

2、,itmakesDFIGoftenfails.StatorandrotorwindingsfailureaccountedforalargeproportionofDFIGfault,soitisparticularlynecessaryforitswindinginter-turnfaultcharacterizationanalysis.Thisarticlebuildtwo-dimensionalfield-circuitcoupledsimulationmodelofDFIGusingAnsoftMaxwel

3、lsoftwarebasedonthefiniteelementtheory.Inthispaper,internalelectromagneticfield,currentandelectromagneticforceofthegeneratorareanalyzedwhenthegeneratorstatorwindingisnormalandfaultindifferentdegree.TherotorlinecurrentisFouriertransformed.Comparingthecurrentharm

4、oniccharacteristicswhenthestatorisnormalandfaultindifferentdegree,wefindthevariationofrotorcurrentwhenstatorwindingisfault.Rotorcurrentsareanalyzedunderbalanceandunbalancevoltageofstatorwhenthegeneratorrotorwindingisfaultindifferentdegree.Thesimulationresultsca

5、nbeclearlyseenthatthephaseandthesizeoftherotorcurrentwereregularlydevelopedwiththefault.Afterspectralanalysis,thefundamentalnegativesequencecurrentandtheharmoniccharacteristicsofthefaultarestudied.Comparingtheharmoniccontentwhenthestatorvoltageisbalancedandunba

6、lanced,weobtainthecharacteristicquantitywhenthestatorvoltageimbalance.Keywords:Doublyfedinductiongenerator(DFIG);finiteelementmethod;winding;inter-turnshortcircuitII华北电力大学硕士学位论文目录目录摘要..............................................................................

7、.....................................IAbstract....................................................................................................................II第1章绪论............................................................................................

8、...............11.1课题背景及意义........................................................................................11.1.1风力发电的发展现状............................................