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1、EnhancedFrequency-AdaptivePhase-LockedLoopforDistributedPowerGenerationSystemApplicationsS.Eren,M.Karimi-Ghartemani,andA.BakhshaiQueen’sUniversityDepartmentofElectricalandComputerEngineeringKingston,Ontario,CanadaEmail:2se1@queensu.ca,karimig@sharif.edu>,alireza.bakhshai@queensu.c
2、aKeywordsDistributedpowergenerationsystem,distributedenergyresources,gridsynchronization,phase-lockedloop,powersystemsignalprocessing.AbstractThestandardsgoverningthegridconnectionofdistributedpowergenerationsystems(DPGS)arebecomingincreasinglydemandingduetothegrowingnumberofalter
3、nativeenergiesbeingconnectedtothegrid.Gridconnectionstandardsnowplacegreateremphasisonthefaultride-throughcapabilitiesoftheDPGS.Inordertofulfillthesestandards,improvementsmustbemadetothegrid-sidecontrolscheme,partofwhichincludesthegridsynchronizationtechnique.Thishasledtoaneedfora
4、robustgridsynchronizationtechnique,whichisabletosynchronizethephaseangleoftheinjectedcurrentoutputoftheDPGSwiththatofthegridvoltagevector,despitethepresenceofgridfrequencyvariations,gridvoltageunbalance,andharmonicdistortions.Anenhancedthree-phasephase-lockedloopispresentedinthisp
5、aperwhichcanbeusedforthispurpose.Itconsistsofamulti-blockadaptivenotchfilter(ANF)integratedintoaconventionalthree-phasesynchronousreferenceframephase-lockedloop(SRF-PLL).TheadditionoftheANFtothephase-lockedloopallowsittoremovethedoublefrequencyripplewhichoccursintheconventionalthr
6、ee-phaseSRF-PLLasaresultofgridvoltageunbalance.Thestructureofthemulti-blockANFiscomposedofmultipleANFunitsplacedinparallel.DuetotheparallelconfigurationoftheANFunits,thisenhancedphase-lockedloopisalsoabletosimultaneouslyremovemultiplesignaldistortions,suchasharmonics,withoutaffect
7、ingthespeedoftheresponse.Finally,duetothefrequency-adaptivenatureoftheANF,itisabletotrackchangesinthegridfrequency.Thus,variationsinthegridfrequencydonotsignificantlyimpedetheperformanceofthephase-lockedloop.Simulationshavebeenincludedtotesttheperformanceofthisenhancedphase-locked
8、loop.IntroductionModernpowersyste
