交错反激式光伏并网微型逆变器-研究

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1、万方数据Rese2urchonGrid．ConnectedPhotovoltaicMicro·InverterBasedonInterleavedFlybackAbstract：Theuseofrenewableenergyhasbeenattachedmoreandmoreimportanceduetotheenergyshortageandenvironmentalpollutionworldwide，solarenergyisclearandwidespreadwhichishigh

2、yvaluedandphotovoltaicpowergenerationisincreasingra

3、pidly．Comparedtocentralizedphotovoltaictechnologywhichisnotthatsuitableinbusinessandresidentialapplication，modularphotovoltaicinvertermeetstherequirementsofthemarketwhichisboostedbythepolicyofdistributedpowergeneration．Withitsremarkablesuperioritiesofhi．ghconversionefficiency,flexibleextend，simplei

4、nstallationandmaintenance，redundantdesign，micro-inverteriSexpectedtOprovidesupportsoftechnologiesanddevicesfordistributedpowergeneration．Photovoltaicgrid-connectedmicro—inverterbaseoninterleavedflybackisresearchedinthisthesisandrelatedfeaturesandcontrolstrategiesareanalyzedunderCCM．Themainworkisasf

5、ollows．(1)AnalyticalexpressionofprimaryandsecondarycurrentinswitchingperiodisestablishedunderCCMandcriticalcontinuousoutputpoweriscalculated．Analyticalresultsindicatethatmicro—inverterrunsunderbothDCMandCCMinhalfgridperiod．TheconceptofContinuousRate(OR)isdefinedtoweightheproportionofCCMareasingloba

6、lareas．(2)Parametersofkeycomponentsinthemaincircuitaredesignedandselected,includingpowerdecouplingcapacitorintheDCside，flyback—transformer,powerelectronicsand西dfilter，whicharetheparameterbasesofthecontrolstrategiesdesigning．(3)Dutycycletooutputcurrenttransferfunctionisestablishedbaseonarbitraryquas

7、isteadystatepoint，AnalyticalresultsshowthattheworsteffecttocontrolperformanceofRHPzerohappensatthesituationofnominalpoweralongswitllpeakgridvoltageandaQ-PRcontrollerofcurrentloopisdesignedbaseonthisquasisteadystatepoint．(4)AkindofimprovedMPPTalgorithmispresentedbymeansofdivisionandcombination，namel

8、y,open-circuitvoltagealgorithmisappliedatthestartup，variablestepP&OalgorithmisappliedwhenthepowerⅡI万方数据fluctuationofPVpaneliSsmallandtothecontraryshort．circuitcurrentalgorithmisapplied．Bothsteadystatetracki