Analysis and Control of PV Inverters Operating in

Analysis and Control of PV Inverters Operating in

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时间:2019-08-09

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1、AnalysisandControlofPVInvertersOperatinginVARModeatNightAliMaknouninejadNasserKutkutIssaBatarsehZhihuaQuUniversityofCentralFloridaOrlando,FLAbstract—PVinvertersareanimportantelementofthechallengeishowtopre-chargetheDCbusandkeepitfuturesmartgrids.Notonlytheycontri

2、butetotheactivepowerregulatedwithinlimitswhileinjectingthedesiredlevelofgenerationasdistributedgenerators(DGs),butalsotheycanreactivepowerintothegrid.Iftheinverteristomerelyhelpgridvoltage/frequencystabilitybygeneratingVAR.operateinreactivepowermode,itneedstocomp

3、ensateforitsAlthoughthenumberofPVinstallationsisrapidlygrowing,theinternallossesandkeepitsDCbusvoltagewithinaneffectiveutilizationofPVinvertersremainslow.Asevenifacceptablerange.AlthoughanumberofpapersdiscusstheinvertersaretooperateinVARmodeduringnighthours,theyd

4、esignofPVinvertersandreferenceoperationinVARmodestillneedsomeactivepowertocompensatefortheirinternalduringnighthours[5,6,7,8],noneoftheaforementionedlosses,regulatetheDCbusandprovidethedesiredlevelofissueshavebeenaddressedordiscussed.Thispaperwillreactivepower.Th

5、ispaperwillprovideadetailedanalysisofPVprovideanovelcontrolstrategythatenablesPVinverterstoinverters’operationinVARcompensationmodewhenactiveabsorblittleactivepowerfromthegridwhentherenewablepowerisnotavailable.Anewcontrolschemeisproposedthatsource(e.g.sun)isnota

6、vailabletocompensatefortheenablesinvertertoabsorblittleactivepowerfromgrid,regulateitsDCbusvoltagewithinlimits,andinjectthedesiredlevelofinverters’internallosses,regulatetheDCbusvoltagetokeepreactivepower.Simulationandexperimentalresultsareprovideditwithinlimits,

7、andoperatetheinvertersinVARmode.Thistovalidatetheanalysis.eventuallyextendstheutilizationofPVinvertersbeyondactivepowergenerationandhelpsimprovinggridstabilityandIndexTerms—HysteresisControl,NightOperationMode,voltageregulation.Detaileddesignprocedureisprovidedan

8、dPVInverter,VARCompensationwillbevalidatedbysimulationandexperimentalresults.II.GridTieInvertersI.IntroductionIngridtiemode,invertersusuallyoperateincurrentmod

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