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SVC与TCSC交互作用及其对低频振荡的抑制研究.docx

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SVC与TCSC交互作用及其对低频振荡的抑制研究 Abstract TheinteractionbetweenSVC(staticvarcompensator)andTCSC(thyristorcontrolledseriescompensator)andtheireffectsonlowfrequencyoscillationarestudiedinthispaper.ApowersystemmodelisbuiltinMATLAB/Simulink,andlowfrequencyoscillationsareintroducedtosimulatetheapplicationscenarios.TheinteractionbetweenSVCandTCSCisanalyzedunderdifferentcontrolstrategies:passive,activeandcoordinatedcontrol.Theresultsshowthatcoordinatedcontrolstrategycaneffectivelysuppresslow-frequencyoscillation. Keywords:SVC,TCSC,interaction,lowfrequencyoscillation,coordinatedcontrol Introduction Lowfrequencyoscillationsareoneofthemostsignificantchallengesofpowersystemstability.Theyarecausedbyvariousfactorssuchasgeneratorexcitationcontrol,networktopology,automaticvoltageregulators,etc.Awell-knownmethodtosuppresslowfrequencyoscillationsistouseFACTS(FlexibleAlternatingCurrentTransmissionSystem)devices.AmongvariousFACTSdevices,SVCandTCSCaretwokeymembers.SVCisashunt-connecteddevicethatcanregulatethereactivepowerofthesystem,whileTCSCisaseries-connecteddevicethatcanregulatethereactanceofthetransmissionline.BothSVCandTCSCcanimprovethepowersystemstabilitybyadjustingthepowerflow,improvingvoltageprofile,andreducingtheoccurrenceofoscillations.However,theinteractionbetweenSVCandTCSCisachallengethatrequiresspecialattention. TheinteractionbetweenSVCandTCSCcanbeclassifiedintothreelevels:passive,active,andcoordinatedcontrol.Inthepassivelevel,bothdevicesworkindependentlywithoutcommunicationorcoordinatedcontrol.Intheactivelevel,bothdevicesarecontrolledthroughcommunicationtoeliminatetheundesiredoscillations.Inthecoordinatedlevel,bothdevicesareoperatedbasedonacoordinatedcontrolstrategytoachieveoptimaldampingoftheoscillations. ThispaperinvestigatestheinteractionbetweenSVCandTCSCatdifferentcontrolstrategiesanditseffectsonlowfrequencyoscillations.ApowersystemmodelisbuiltinMATLAB/Simulink,andlowfrequencyoscillationsareintroducedtosimulatetheapplicationscenarios.Theresultsofthesimulationsshowthatthecoord