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1、1354IEEETRANSACTIONSONPOWERSYSTEMS,VOL.15,NO.4,NOVEMBER2000VoltageStabilityAnalysis:V–QPowerFlowSimulationVersusDynamicSimulationBadrulH.Chowdhury,StudentMember,IEEEandCarsonW.Taylor,Fellow,IEEEAbstract—Severalanalysismethodsareavailableforlong-termNewtonalgorithmand“nondivergence”techniqu
2、es[4].Refer-voltagestability.The–curvepowerflowmethodiswidelyusedence[1,AppendixB]providesintroductorydescription.byWesternSystemsCoordinatingCouncilutilities,andhassomeadvantages.Long-termdynamicsimulationwithpropermodeling,however,isclearlythemostaccuratesimulationmethod.B.–CurveMethodol
3、ogyWecomparethetwomethodsforwintertimevoltagestabilityproblemsinthePortland,OregonUSAloadarea.ResultsfromForapowerflowbaseoroutagecase,powerflowsaresimu-the–methodcanbemisleading.Thesameistrueofotherlatedwithaseriesofvoltagemagnitudesscheduledataselectedpowerflowprogrambasedanalysisemployi
4、ngconventionalmod-importantbus.TheselectedbusischangedtoafictitiousPVeling.Resultsfromthesepowerflowmethodsmaybepessimistic,bus,equivalenttoapplyingafictitioussynchronouscondensercausingoverdesignoroverlyconservativeoperation.orSVCatthebus.Thevoltagemagnitudescheduledisaninde-IndexTerms—Lo
5、ng-termdynamicsimulation,powerflowsim-pendent()variable.Thereactivepowerinjectionisadepen-ulation,voltagecollapse,voltagestability.dent()variable.(–curves,similarto–curvesarealsopossiblewherereactivepoweratoneormanybussesareinde-I.VOLTAGESTABILITYANALYSISpendentvariables,andvoltagesatmanyb
6、ussesaredependentvariables.)NRECENTyears,voltageinstabilityandcollapsehavelim-AcurveofbusvoltageversussynchronouscondenseroutputIitedpowertransfersandthreatenedpowersystemreliability.istherebygenerated.TheoperatingpointisatzeroMVAroutputManyanalysismethodshavebeendeveloped[1]–[3].ofthefict
7、itioussynchronouscondenserunlessreactivepower–and–curvepowerflowprogrammethodshavebeencompensationisavailableorplannedforthebus.usedformanyyears.BonnevillePowerAdministration(BPA)The–curvecomputationisautomatedinmanypowerandotherWesternSystemsCoordinatingCounc
