单板光伏组件微逆变器技术的研究

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1、ABSTRACTWiththedevelopmentofthebuildingintegratedphotovoltaic031PV)technolo科，singlephotovoltaicmoduleequippedwithindependentmicroinverterormicroinvener商dstructureinrecentyearsbecomeahotresearchtopicinthefieldofphotovoltaicpowergenerationtechnology．Asakindofsmallpo

2、wergridmodule，microinverterhasm删characteristicssuchassmallvolume，flexiblegrid—connecting，simplecontrolling·Themainresearchcontentofthisarticleistodesignapracticalsinglephotovoltaicinverterwhichissuitableforsinglepowerphotovoltaicmodules，thedesignratedpoweris250W：C

3、onsiderfromthepractical，thisthesisanalyzesthevolt-amperecharacteristiccurveofhigh-powersinglephotovoltaicmoduleandseveralkindsofcommonlyUSedmethodofmaximumpowertracking(MPPT)．AVariableStepSizeP&OMPPTMethodisfmallychosen．1Kst11esistakesthetwostagemicro．inverterasth

4、eresearchobjectandmainlyfocusesonthehardwaredesignofprecedingstageMPPTcontrollerandthebackwardstageiIlverter．Themicroinverterisintheserviceofsinglephotovoltaicmodule，buttheopencircuitoutputvoltageofthesinglephotovoltaicmoduleislow,SOthemacroinvertermusthayehighste

5、p-upratioinordertorealizegridgeneration．Therefore，thisarticlechoosesakindofhighvoltagegainconverterasthetopologyoftheprecedingstageMPPTcontroller．ComparedwiththeconventionalDC·DCconverterinsalTlepowerlevel，theconverterhasabetterabilityofboost，higherconversioneffic

6、iencyandlowervoltagestressonpowerswitchtubes．BasedonthesewecompletedtheschematicdiagramdesignoftheMPPTcontroller,devicesselection,controlstrategyselectionandtheprogramingofcontrolalgorithm．Thispaperhasalsodescribedindetailsabouttheprecedingstageinvertertopologydes

7、ign，妒d—connectioncontrolstrategyandthePWMdebugghagmode．Wecompletedthemainpowerckcuitoffullbridgeinverterandtheanalysisanddesignofcontrolckcuitatlast．Finally，wedesignedandmanufacturedamicro—inverterprototyperatedpowerat250w,andcompletedthefunctionontheprototype．Exp

8、erimentresultsshowthatthedesignisreasonableandCanmeetthepracticalrequirements·KEYWORDS：MPPTcontroller；Micro—inverter；PVsystem；Grid。connectingfI．ASSNO：TM