双馈风电场经串补线路并网引起的次同步振荡分析

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1、华北电力大学硕士学位论文AbstractDoublyFedInductionGenerators(DFIG)arebeingmoreandmorewidelyusedinwindgenerationareawithitsflexibilityoncontrol.Withtheexpansionofthescaleofwindfarms,thelarge-scalewindpowerisoutgoinginseriescapacitorcompensationcircuit(shortforseriescom

2、pensatedlines).Becausetheseriescapacitorcompensationtechniqueimproveslinetransmissioncapacityandenhancessystemstability,itisaneconomicallyrealizinglongdistancetransmissionmaturetechnology.Whiledoublyfedwindpowergenerationsystemisconnectedtopowergridviaseri

3、escompensation,theSubsynchronousOscillation(SSO)problemsmayalsoappearsimilarlywithwhichtriggeredbythermalpowerconnectingtopowergridthroughseriescompensatedtransmissionlines.TheSSOproblemsindoublyfedwindpowersystemsaremainlytwotypesofphenomenaasinductiongen

4、eratoreffect(IGE)andsubsynchronouscontrolinteraction(SSCI).ThisstudyanalyzesthemechanismofSSOproblemscausedbydoublyfedwindpowergenerationsystemwhenconnectedtopowergridviaseriescompensationandproposesacorrespondingsuppressionmeasure.Firstly,adoublyfedwindpo

5、wergeneratormodelfortheanalysisonSSOisestablished.Themathematicalmodelincludeswindturbines,doublyfedinductiongeneratorandvariouspartsofthetransmissionline.Studiesaredoneonmaximumwindpowertrackingalgorithmandpitchanglecontrolaswellascontrolprinciplesofbothg

6、ridsideconverterandrotorsideconverter.BasedonmathematicalmodelsofDFIG,asimulationmodelofDFIGconnectingtothegridviaseriescompensationisbuiltunderMatlab/Simulinkenvironment.Then,thefrequency-scanningmethodisutilizedtoanalyzethemechanismandimpactingfactorsofI

7、GEandthemechanismandimpactingfactorsofSSCIarederivedandanalyzedintheviewpointofclosedloopcontrolofrotorsidecurrentloop,andtime-domainsimulationisutilizedtoanalyzeandvalidatetheimpactsofwindspeedandseriescompensationdegreeonIGErespectivelyaswellastheimpacts

8、ofcontrolparametersofrotorsidecurrentlooponcharacteristicsofSSIC.ResearchresultsshowthattheincreaseofcompensationdegreeandthedecreaseofwindspeedmaycauseIGE;theincreaseofproportionalityfactorandintegrationcoef