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1、292IEEETRANSACTIONSONINDUSTRIALELECTRONICS,VOL.61,NO.1,JANUARY2014ANovelGridSynchronizationPLLMethodBasedonAdaptiveLow-PassNotchFilterforGrid-ConnectedPCSKyoung-JunLee,StudentMember,IEEE,Jong-PilLee,Member,IEEE,DongsulShin,Dong-WookYoo,Member,IEEE,andHee
2、-JeKimAbstractTheamountofdistributedenergyresources(DERs)bilityamongtransmissionsystemoperators[4].Asaconse-hasincreasedconstantlyworldwide.ThepowerratingsofDERsquence,theperformanceofDGsystemsmustbeimprovedhavebecomeconsiderablyhigh,asrequiredbythenewgr
3、idcodetomeetthegridcodesineachcountry.Before2003,thererequirement.Tofollowthegridcodeandoptimizethefunctionwerenorequirementsfromutilitygridsforthelow-voltageofgrid-connectedinvertersbasedonDERs,aphase-lockedloop(PLL)isessentialfordetectingthegridphasean
4、gleaccuratelyride-through(LVRT)orfaultride-throughperformanceofwindwhenthegridvoltageispollutedbyharmonicsandimbalance.turbine(WT)generatorsystems(WTGSs),butinthatyear,Thispaperproposesanovellow-passnotchfilterPLL(LPN-PLL)E.ONNetzofGermanywasthefirsttoimpl
5、ementthoseneedscontrolstrategytosynchronizewiththetruephaseangleoftheintotheirgridcode[5]–[7].Accordingtotheguidelinesofthegridinsteadofusingaconventionalsynchronousreferenceframegridcodes,WTGSneedstobeongridandprovidereactivePLL(SRF-PLL),whichrequiresad
6、−q-axistransformationofthree-phasevoltageandaproportionalintegralcontroller.Thepowertothegrid.OnlywhenthegridvoltagedropsbelowtheproposedLPN-PLLisanupgradedversionofthePLLmethodus-guidelinesofthegridcodesistheWTGSdisconnectedfromingthefastFouriertransfor
7、mconcept(FFT-PLL)whichisrobustthegrid[8],[9].Manystudieshaveexaminedadvancedcontroltotheharmonicsandimbalanceofthegridvoltage.TheproposedregardingtheoperationofWTsunderbalancedandunbalancedPLLalgorithmwascomparedwithconventionalSRF-PLLandgridfaults[6],[1
8、0]–[14].Nevertheless,theseadvancedcontrolFFT-PLLandwasimplementeddigitallyusingadigitalsignalprocessorTMS320F28335.A10-kWthree-phasegrid-connectedmethodsrequireaccurateinformationofthegridvoltagetoinverterwasset,andaverific
