三电平光伏并网逆变技术的研究

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1、江苏科技大学工学硕士学位论文IIAbstractAbstractWiththedevelopmentofworldeconomyandthedeepeningrequirementsofthescientificconceptofdevelopment,growingenergydemandandtheglobalenvironmentalpollutionandecologicaldeteriorationbecauseofthewideuseofconventionalfossilfuels,thehumansareforcingcontinuallytoseekandexp

2、lorerenewableenergy.Solarenergyisakindofnewandrenewableenergyandsolarpowertoalleviatetheseriousenvironmentpollutionandenergycrisishasveryimportantsignificance.Underthisbackground,thetechnologyofthePVgrid-connectedinverterisresearcheddeeplyinthispaper.Themaximumpowerpointtrackingofsolarcell,SV

3、PWMmodulationtechnologyofthreelevelinverter,gridinvertercontrolstrategy,systemsimulationandsoonwerealsodeeplystudiedinthispaper.Theequivalentcircuitofsolarbatteryhasbeenfirstgotbyanalyzingtheworkingprincipleofsolarbattery.Basedontheequivalentcircuit,thebatterysimulationmodelwasgot,andthentheo

4、utputcharacteristicsofsolarbatterycanbeacquiredfromthemodel.Byresearchingandanalyzingthecommonmethodsofmaximumpowerpointtracking,thevariablestepsizeconductivityincrementalmethodcanbedesignedbasedonfuzzycontroltheorytoachievemaximumpowerpointtracking.Analysisandtestingthemethodsbyestablishingt

5、hesimulationmodel.Comparedtothetraditionaltwolevelinverter,themultilevelinverterhasmanyadvan-tages.First,itdecreasesvoltagestressandtheharmonicoftheoutputvoltagebyincreasingswitchtubequantityandthelevelnumberofmaincircuit.Second,thecontrolmodeisagile.Third,theswitchtubeofinverterisworkinginlo

6、wfrequencyorworkinfrequencystatetoreducetheswitchinglossesandelectromagneticinterference,anditismoresuitableforhighpowerapplications.Inthispaper,Thethreelevelinverterwasusedasphotovoltaicgridinvertercircuitandthetopologyofthethreelevelinvertercircuitwasanalysed.ThekeyresearchisSVPWMmodulation

7、technologyofthreelevelinvertercircuit.Itcontainsclassificationandjudgmentofthesector,selectionofthebasicvectoranddecisionofbasicvectoractionsequenceandcalculationofactiontimeofbasicvectorineachsector,calculateingswitchingtimeofeachbridgearmof