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1、5024IEEETRANSACTIONSONPOWERELECTRONICS,VOL.28,NO.11,NOVEMBER2013MitigationofLowerOrderHarmonicsinaGrid-ConnectedSingle-PhasePVInverterAbhijitKulkarni,StudentMember,IEEE,andVinodJohn,SeniorMember,IEEEAbstractInthispaper,asimplesingle-phasegrid-connectedandle
2、ssercomponentcountinthesystemimprovestheoverallphotovoltaic(PV)invertertopologyconsistingofaboostsection,reliability.Thistopologywillbeagoodchoiceforlow-ratedalow-voltagesingle-phaseinverterwithaninductivefilter,andaPVinvertersofratinglessthanakilowatt.Thedi
3、sadvantagestep-uptransformerinterfacingthegridisconsidered.Ideally,thiswouldbetherelativelylargersizeoftheinterfacetransformertopologywillnotinjectanylowerorderharmonicsintothegridduetohigh-frequencypulsewidthmodulationoperation.However,thecomparedtotopolog
4、ieswithahigh-frequencylinktransformernonidealfactorsinthesystemsuchascoresaturation-induceddis-[1].tortedmagnetizingcurrentofthetransformerandthedeadtimeofThesystemshowninFig.1willnothaveanylowerorderhar-theinverter,etc.,contributetoasignificantamountoflower
5、ordermonicsintheidealcase.However,thefollowingfactorsresultinharmonicsinthegridcurrent.Anoveldesignofinvertercurrentlowerorderharmonicsinthesystem:Thedistortedmagnetizingcontrolthatmitigateslowerorderharmonicsispresentedinthispaper.Anadaptiveharmoniccompens
6、ationtechniqueanditsde-currentdrawnbythetransformerduetothenonlinearityinthesignareproposedforthelowerorderharmoniccompensation.InB–Hcurveofthetransformercore,thedeadtimeintroducedaddition,aproportional-resonant-integral(PRI)controlleranditsbetweenswitching
7、ofdevicesofthesameleg[2]–[6],on-statedesignarealsoproposed.Thiscontrollereliminatesthedccompo-voltagedropsontheswitches,andthedistortioninthegridnentinthecontrolsystem,whichintroducesevenharmonicsinthevoltageitself.gridcurrentinthetopologyconsidered.Thedyna
8、micsofthesystemduetotheinteractionbetweenthePRIcontrollerandtheadaptiveTherecanbeadcinjectionintothetransformerprimaryduecompensationschemeisalsoanalyzed.Thecompletedesignhastoanumberoffactors.Thesecan
