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有源钳位反激式光伏并网逆变器的研究.docx

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有源钳位反激式光伏并网逆变器的研究 Abstract Astherenewableenergyindustrygrowsrapidly,solarphotovoltaic(PV)systemshavebecomeanincreasinglypopularchoice.Grid-connectedsolarPVinvertersareimportantcomponentsofsuchsystemsastheytransformthedirectcurrent(DC)outputofsolarpanelsintoalternatingcurrent(AC)foruseinhomesorbusinesses.However,traditionalgrid-connectedinverterssufferfromlowefficiencyandpoorperformanceundervaryingweatherconditions.Inresponsetosuchchallenges,theactiveclampflybackconverterhasemergedasapromisingalternative.Thispaperexplorestheapplicationofthisconverterinthedesignofagrid-connectedsolarPVinverterandinvestigatesitsperformancecharacteristicsunderdifferentoperatingconditions. Introduction Thetraditionalgrid-connectedinverterhasathree-stagestructure:aboostconverter,aDC-ACinverter,andafilter.TheboostconverterbooststheDCvoltageofthesolarpanelstoalevelsuitablefortheinverter,whichconvertstheDCvoltageintoACvoltagetomatchthegridvoltage.However,theboostconvertersuffersfromlargevoltagestressandefficiencyloss,especiallywhenoperatingunderpartialloadconditions.TheDC-ACinverteralsosuffersfromlowefficiencywhenthesolarpanels'outputvoltagefluctuateswidely.Finally,thefilterisbulkyandexpensiveduetotheneedforlargefilteringcapacitorsandinductors.Inordertoimprovetheperformanceofthegrid-connectedinverter,theactiveclampflybackconverterhasbeenproposed. ActiveClampFlybackConverter Theactiveclampflybackconverterconsistsofaflybacktransformer,anactiveclampcircuit,andacontrolcircuit.AsshowninFigure1,theconverter'sinputvoltageisfedtotheprimarywindingofthetransformer.Theactiveclampcircuitclampsthetransformer'svoltagetoalevelbelowtheinputvoltage,resultinginalowervoltagestressandincreasedefficiency.Thecontrolcircuitvariesthedutycycleoftheswitchtoregulatetheoutputvoltage. ![image-20220617094816061](assets/image-20220617094816061.png) Figure1:ActiveClampFlybackConverter Grid-ConnectedSolarPVInverterDesign Theproposedgrid-connectedsolarPVinverterisshowninFigure2.TheDCvoltageoutputofthesolarpanelsisfedtotheinp