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1、BenefitsofSVCandSTATCOMforElectricUtilityApplicationAbstract--ExaminationofthebehaviorofSVCsandSTATCOMsinelectricpowersystemsispresented.Thepaperisbasedonanalyticalandsimulationanalysis,andconclusionscanbeusedaspowerindustryguidelines.WeexplaintheprinciplestructuresofSVCsand
2、STATCOMs,themodelsfordynamicstudies,andtheimpactofthesedevicesonsteadystatevoltageandtransientvoltagestability.SensitivityanalysisisprovidedwhichshowstheimpactofSVCsandSTATCOMswithregardtonetworkstrength.Harmonicissues,spacerequirements,andpricediscussionsarealsobrieflyaddre
3、ssed.IndexTerms—DynamicCompensators,SVC,STATCOM,ShortCircuitCapacity,GainSensitivity,ShortTermVoltageStability,HarmonicsI.INTRODUCTIONSHUNT-connectedstaticvarcompensators(SVCs)areusedextensivelytocontroltheACvoltageintransmissionnetworks.Powerelectronicequipment,suchasthethy
4、ristorcontrolledreactor(TCR)andthethyristorswitchedcapacitor(TSC)havegainedasignificantmarket,primarilybecauseofwell-provenrobustnesstosupplydynamicreactivepowerwithfastresponsetimeandwithlowmaintenance.Withtheadventofhighpowergateturn-offthyristorsandtransistordevices(GTO,I
5、GBT,…)anewgenerationofpowerelectronicequipment,STATCOM,showsgreatpromiseforapplicationinpowersystems[3,4].ThispaperaimstoexplainthebenefitsofSVCsandSTATCOMsforapplicationinutilitypowersystems.InstallationofalargenumberofSVCsandexperiencegainedfromrecentSTATCOMprojectsthrough
6、outtheworldmotivatesustoclarifycertainaspectsofthesedevices.II.BASICDESCRIPTIONThissectionexplainsbrieflythebasicconfigurationofSVCsandSTATCOMs:A.SVCThecompensatornormallyincludesathyristor-controlledreactor(TCR),thyristor-switchedcapacitors(TSCs)andharmonicfilters.Itmightal
7、soincludemechanicallyswitchedshuntcapacitors(MSCs),andthenthetermstaticvarsystemisused.Theharmonicfilters(forthe9TCR-producedharmonics)arecapacitiveatfundamentalfrequency.TheTCRistypicallylargerthantheTSCblockssothatcontinuouscontrolisrealized.Otherpossibilitiesarefixedcapac
8、itors(FCs),andthyristorswitchedreactors(TSRs).Usuallyadedicatedtransformeri
