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1、SVCforresonancecontrolinNamPowerelectricalpowersystemM.HalonenUdoKleyenstüberSeptimusBoshoffChrisvanderMerweS.RudinNamPowerR.U.P.Trans-AfricaprojectsB.ThorvaldssonWindhoek,NamibiaJohannesburg,SouthAfricaJohannesburg,SouthAfricaABBPowerSystemsVästerås,SwedenAbstractRuacana330kVTheextensionofth
2、eNamibiantransmissionsystemresultsinanear50Hzresonance.TocontroltheresonanceaSVCwasinstalledat520kmAuas400kVsubstation.Anewcontrolprincipleforcontrollingtheresonancewasdevelopedandtested.ThepaperpresentstheOmburubackgroundtotheresonanceproblem,theAuasSVCconfiguration,theresonancecontrollerand
3、finallytheconclusionsfromextensivetestresults,bothfromsimulatorandsitetests.SVCKeywords:VanEckReactivepower,staticvarcompensators,sustainedtransientAuasovervoltage,controldesign,resonancecontrol,d/q-transformation,PLL,RealTimeDigitalSimulatorHardap470kmKokerboom400kVI.INTRODUCTION220kVThepre-
4、2000Namibiantransmissionnetwork(asperFig.1420kmbutwithoutany400kVinterconnection)wasuniqueintermsHariboflinelengthsanddistributionofloadsandgeneration.DueAriestoitsradiallayout,thenetworkwashighlysusceptibletovoltage,qualityofsupply,transientanddynamicstabilityandVarcompensationproblems.Thema
5、insourcesofgenerationAgganisESKOMorin-feedareonlyconnectedtotheperipheryofthenetwork.ThereforethefaultlevelswererelativelylowthroughoutthenetworkandwerenormallythelowestatthemainloadFigure1.SinglelinediagramoftheNamPowersystemcentersinthecentralpartofthecountry.However,voltagecontrolproblemsi
6、nthecentralareawerehandledbyaSVCclosetothecenter,atOmburuSubstation.TheNamibiantransmissionsystemisconnectedtotherelatively“strong”networkofEskom,SouthAfricainthesouthandahydropowerstationontheNamibianborderinthenorth(RuacanaPowerStation)whichsupplies“local”generation(theRuacanaPowerStationis
7、situatedabout1500kmfromtheEskomin-feedintheSouth)ThePre-2000network,especiallythe835kmlong220kVsouthernlinktoEskom,wasoftenloadedtoitsstabilitylimitswhenRuacanagenerationlevelswereloworzero.WiththegrowingNamibialoaditbecameincreasinglydifficu
