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1、SoftwarePhase-LockedLoopappliedtoDynamicVoltageRestorer(DVR)ChangjiangZhan,C.Fitzer,V.K.Ramachandaramurthy,A.Arulampalam,M.Barnes,N.JenkinsDept.ofElectricalEngineering&ElectronicsUMIST,P.O.Box88,M60lQD,Mrmchester,UKEmail:mchsscjz@fs5.ee.umist.ac.ukAbstract:Inthkpaper,theanalyticalandpracticaldesign
2、issuesofashowninFigure2.ThissoflvvarebasedVP-PLLmethodsotlwarephase-lockedloop(SPLL)forDVRarepresented.ASPLLavoidstheproblemscausedbythehardwarecomparatorusedmodelthatusesalag/leadloopcontroller,isderivedinordertoinahardwarePLL.Ifthevectorproductisequaltozero,theanalysethesystemperformanceandfilter
3、ingcharacteristicbythethree-phaseswitchingpatternbecomessynchronisedtotheuseofbodediagramsandroot-locusmethods.InDVRapplications,mainssupplyvoltage.Asimilaridea,basedon‘Transvectors’parametersofthedesignoftheSPLLcontrollerarenotonlywaspresentedin1972[3].Thevector-basedPLLhasevolveddependentontheste
4、adystateanddynamicstate,butalsoonpracticalconditionssuchasutilityunbalance,voltagesaglswelleversince[4-6].magnitude,voltageharmonics,phasejumpsandfrequencyvariations.Therefore,thepracticalaspectoftheSPLLimplementationhasalsobeendiscussed.Experimentalresultsdemonstrateitsphasetrackingcapability.Keyw
5、ords:Phase-lockedloop(PLL),DynamicVoltageRestorer,IISynchronousrotatingfi-ame,Voltagesags.Fig.2Theblockdiagramofavector-productphase-lockedImp(VP-PLI.INTRODUCTIONIn[7],thepositivesequencevoltagewasmeasuredusingaPhaseangleandIiequencyinformationoftheutilityfilterandthephaseangleofthepositivesequence
6、wasusedvoltageiscriticalforthecontrolofFACTSandCustomunderavoItageunbalancecondition.However,thefilterusedPowerdevices.However,theutilityvoltagesaresubjecttotendstointroduceaphasedelay.In[8],aninstantaneousvoltageunbalance,flicker,harmonicandfrequencyphaseangledetectionalgorithmundervoltagesagcondi
7、tionsvariations.Undertheseconditions,thePLLshouldbeabletousingtheweightedleast-squaresestimationmethodwaslocktothephaseoftheutilityvoltagesasquicklyaspossibleproposed.Usingthismethod,thepositiveandnegativea
