POWER QUALITY IMPROVEMENT IN DISTRIBUTION SYSTEM USING DSTATCOM

Abstract

Intherecenttimes,theelectricaldistributionnetworkisfacing challengesin maintaining powerquality(PQ)due to increasing use ofsensitive electronic equipmentinmostoftheresidential,industrialandcommercialapplications.These electronicequipmentsbehaveasnonlinearloadstothepowersystem network.The custom powerdevices(CPDs)arebeingusedasremediestoimprovethePQ problemsfacedbythepowerdistributionnetwork,thecommonlyusedCPDsareD STATCOM (distribution static compensator),UPQCs (unified power quality conditioners),andDVR(dynamicvoltagerestorers)etc.ADSTATCOM isusedfor eliminationofharmonicsinsourcecurrent,reactivepowercompensation,power factorcorrectionandforloadunbalancingthroughappropriatecontrolofitsvoltage sourceconverter(VSC).ADSTATCOMinjectscurrentintosystemtomaintainsource currentsinusoidalandmaintainunitypowerfactorbetweensourcevoltageand current.ThepresentworkgivesadetailedperformanceanalysisofDSTATCOM usingtwodifferenttypesofcontrolalgorithmsforVSCi.e.synchronousreference frame(SRF)andAdaptiveBasedcontrol.Thesecontrolschemesaremodeledand simulatedinMATLABSIMULINKtogeneratereferencesourcecurrentandcontrol signaltoD-STATCOM tomitigatepowerqualityproblemsunderdifferentloading condition.Thecomparisonperformanceanalysisofbothalgorithmsonthebasisof THD(totalharmonicdistortion)insourcecurrentispresented.Theperformanceof DSTATCOM forreactivepowercompensation,powerfactorcorrectionandload balancing is also analyzed using SRF and adaptive based algorithms.The DSTATCOM isconnectedinshuntconfigurationtodistributionsystem feeding differenttypeloads.