ACTIVE-POWER-FILTER-FOR-POWER-COMPENSATION：电力有源电力滤

ACTIVEPOWERFILTERFORPOWERCOMPENSATIONPresentedBy:ARUNKUMARN.K1OX11EPE01InthisPresentation,anewActivePowerFilter(APF)controlschemehasproposedtoimprovetheperformanceoftheAPF.Thispresentationpresentsanewtechniquewithinstantaneouspowertheory(P-Qtheory)inordertocontrolofAPFundernon-idealmainsvoltageconditions.Performanceoftheproposedschemehasbeenfoundfeasibleandexcellenttothatoftheinstantaneousreactivepoweralgorithmsundervariousnon-idealmainstestscenarios.MATLAB/SIMULINKpowersystemtoolboxisusedtosimulatetheproposedsystem.Theproposedmethod’sperformanceiscomparedwithconventionalinstantaneouspower(P-Q)theory.Thesimulationresultsarepresentedanddiscussedshowingtheeffectivenessofthecontrolalgorithm.ABSTRACTINTRODUCTIONPOWERQUALTITYINPOWERDISTRIBUTIONSYSTEMSSOLUTIONSTOPOWERQUALITYPROBLEMSBASICPRINCIPLEOFACTIVEPOWERFILTERSTYPESOFTHEACTIVEPOWERFILTERSINSTANTANEOUSPOWERTHEORYTHEPROPOSEDMETHOD•SHUNTACITVEPOWERFILTER•3-PHASE4-WIRESHUNTACIVEPOWERFILTERWITHRENEWABLEENERGYINTERFACESIMULATIONRESULTSCONCLUSIONREFERENCECONTENTSINTRODUCTIONInamodernpowersystem,increasingofloadsandnon-linearequipment'shavebeendemandingthecompensationofthedisturbancescausedforthem.Thesenonlinearloadsmaycausepoorpowerfactorandhighdegreeofharmonics.ActivePowerFilter(APF)cansolveproblemsofharmonicandreactivepowersimultaneously.APFhavetheabilitytoadjusttheamplitudeofthesynthesizedacvoltageoftheinvertersbymeansofpulsewidthmodulationorbycontrolofthedc-linkvoltage,thusdrawingeitherleadingorlaggingreactivepowerfromthesupply.ShuntAPF’sallowthecompensationofcurrentharmonicsandunbalance,togetherwithpowerfactorcorrectionPowerQualitycanbedefinedasthephysicalphysicalcharacteristicsoftheelectricalsupplyprovidedundernormaloperatingconditionsthatdonotdisturbthecustomersprocess.PowerQualityproblemexistsduetochangeinvoltage,currentorfrequencydeviationresultsinafailureorinabadoperationoftheequipment.PowerQualityproblemsareduetoNaturalPhenomenaSwitchingPhenomenaConnectionofhighpowernonlinearloadsVoltageSagsPOWERQUALITYINPOWERDISTRIBUTIONSYSTEMTherearetwoapproachestothemitigationofpowerqualityproblems.LoadConditioningLineConditioningAflexibleandversatilesolutiontovoltagequalityproblemsisofferedbyActivePowerFilters.ShuntactivepowerfiltersoperateasacontrollablecurrentsourceseriesactivepowerfiltersoperatesasacontrollablevoltagesourceSOLUTIONSTOTHEPOWERQUALTIYActiveFilterConnectionLoadonACSupplyACSupplyOnLoadShunt•CurrentHarmonicFiltering.•Reactivecurrentcompensation.•Currentunbalance.•VoltageFlickerSeries•CurrentHarmonicFiltering.•Reactivecurrentcompensation.•Currentunbalance.•VoltageFlicker•VoltageUnbalance•VoltageSag/Swell.•VoltageUnbalance.•VoltageDistortion.•VoltageInterruption.•VoltageFlickerandnotching.3phaseuncontrolleddiodebridgerectifierwithresistiveloadingUsingtheswitchingmodepowerconvertertoperformtheharmoniccurrentelimination.Thepowerconverteriscontrolledtogenerateacompensationcurrent,whichisequalbutoppositetheharmonicandreactivecurrentsgeneratedfromthenonlinearload.AvoltagesourceinverterhavingIGBTswitchesandanenergystoragecapacitoronDCbusisimplementedasashuntAPF.PRINCIPLEOFACTIVEPOWERFILTERFig.BlockDiagramofAPF1.ShuntActivePowerFilters:Itcompensatecurrentharmonicsbyinjectingequal-but-oppositeharmoniccompensatingcurrent.Itoperatesasacurrentsourceinjectingtheharmoniccomponentsgeneratedbytheloadbutphaseshiftedby180deg.TYPESOFACITVEPOWERFILTERSFig.Compensationcharacteristicsofashuntactivepowerfilter2.SeriesActivePowerFilters:Fig.SeriesactivepowerfiltertopologyItcompensatecurrentsystemdistortioncausedbynon-linearloads.ThehighimpedanceimposedbytheseriesAPFiscreatedbygeneratingavoltageofthesamefrequencythatthecurrentharmoniccomponentthatneedstobeeliminated.Voltageunbalanceiscorrectedbycompensatingthefundamentalfrequencynegativeandzerosequencevoltagecomponentsofthesystem.3.HybridActivePowerFilters:Fig.HybridActivepowerfilterBycontrollingtheamplitudeofthevoltagefundamentalcomponentacrossthecouplingtransformer,thePFofthepowerdistributionsystemcanbeadjusted.Thecontroloftheloadpowerfactorimposedahighervoltageacrossthefiltercapacitor.ThistypeofconfigurationisveryconvenientforcompensationofhighpowermediumvoltagenonlinearloadsInthree-phasecircuits,instantaneouscurrentsandvoltagesareconvertedtoinstantaneousspacevectors.Three-phasecurrentsandvoltagesarecalculatedasfollowingequationsInthree-phaseconventionalinstantaneouspoweriscalculatedasfollows:P=eα.iα+eβ.iβInfact,activepower(p)isequaltofollowingequation:P=ea.ia+eb.ib+ec.icINSTANTANEOUSPOWERTHEORYαandβareorthogonalcoordinates.InstantaneousrealandimaginerpowersarecalculatedasequationTheaboveequationcanbewrittenasFromaboveinstantaneouscompensatingcurrentasαandβCoordinatesaregivenbelowContinued…PROPOSEDMETHODItmustbeusedwhenthevoltagesaredistortedorunbalancedandsinusoidalcurrentsaredesired.Inproposedmethod,instantaneousvoltagesarefirstconvertedtoα-βcoordinatesandthentostationaryd-qcoordinates.Theproducedd-qcomponentsofvoltagesarefilteredandreverseconvertedα-βcoordinates.Thesefilte