STATCOM 原理介绍 动态无功补偿原理介绍.pdf

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1、STATCOM(StaticSynchronousCompensator)Itisadeviceconnectedinderivation,basicallycomposedofacouplingtransformer,thatservesoflinkbetweentheelectricalpowersystem(EPS)andthevoltagesynchronouscontroller(VSC),thatgeneratesthevoltagewavecomparingittotheoneoftheelectricsystemtorealizetheexchangeofreactivepow

2、er.ThecontrolsystemoftheSTATCOMadjustsateachmomenttheinversevoltagesothatthecurrentinjectedDonsiónInthenetworkisincuadraturetothenetworkvoltage,intheseconditionsP=0andQ=0.Initsmostgeneralway,theSTATCOMcanbemodeledasaregulatedvoltagesourceViconnectedtoavoltagebarVsthroughatransformer.24/08/2007STATCO

3、M(StaticSynchronousCompensator)DonsiónSTATCOM-AVSCinterfacedinshunttoatransmissionlineTheSTATicCOMpensator(STATCOM)usesaVSCinterfacedinshunttoatransmissionline.InmostcasestheDCvoltagesupportfortheVSCwillbeprovidedbytheDCcapacitorofrelativelysmallenergystoragecapability-hence,insteadystateoperation,a

4、ctivepowerexchangedwiththelinehastobemaintainedatzero,asshownsymbolicallyintheFigure.24/08/2007STATCOM(StaticSynchronousCompensator)DonsiónSTATCOM-AVSCinterfacedinshunttoatransmissionlineWiththeactivepowerconstraintimposed,thecontroloftheSTATCOMisreducedtoonedegreeoffreedom,whichisusedtocontroltheam

5、ountofreactivepowerexchangedwiththeline.Accordingly,aSTATCOMisoperatedasafunctionalequivalentofastaticVARcompensator;itprovidesfastercontrolthananSVCandimprovedcontrolrange.24/08/2007STATCOM(StaticSynchronousCompensator)EachGTOconvertergeneratesavoltagethatissteppedupbyaline-Donsiónside-series-conne

6、ctedmulti-stageconvertertransformer.Theconvertertransformerenablesthebuild-upofasine-wavevoltageinbothmagnitudeandphase.BecauseSTATCOMswithmulti-stageconvertertransformersdonotgeneratesignificantinternalharmonics,theygenerallyrequireminimal,orno,harmonicfiltering.IfthenumberoffiringpulsesfortheGTOsi

7、sincreased(i.e.,pulse-widthmodulation(PWM)order),theharmonicsarefurtherdecreased.High-sidevoltageisgenerallyusedasacontrollerinput,asindicatedinthefigure.24/08/2007STATCOM(StaticSynchronousCompensator