One-cycle controlled single phase ac chopper

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1、One-CycleControlledSinglePhaseACChopperWangLiqiaoandLiuQingKeyLabofPowerElectronicsforEnergyConservationandMotorDriveofHebeiProvince,YanshanUniversity,Qinhuangdao,066004,ChinaAbstract-Acchoppershavebeenwidelyusedinindustryapplicationssuchaslightingdimmers,industr

2、ialheater,soft-startingofinductionmotorsandspeedcontrolofpumps,andtheircontrolmethodoftenadoptvoltageinstantaneousvaluePIcontrol.ThismethodhasthefaultofbaddynamicresponseandtheSQdistortionofoutputvoltageatzero-crossing.One-cyclecontrolRQtechniquecansolvethisprobl

3、em.One-cyclecontrolisanonlinearurefcontrolmethodwhichhasfasttransientresponseandgoodtrackingperformance.Asinglephaseacchopperwithone-cyclecontrolmethodispresented;thebasicoperationaltheoryandcontrolmethodarediscussedinthispaper.Finally,simulationwaveformsandexper

4、imentalresultsaregiven.TheexperimentalFig.1Basicprincipleofone-cyclecontrolresultsdemonstratetheeffectivenessofthiscontroltechnique.one-cyclecontroltechniqueisdesignedtocontroltheduty-ratiooftheswitchinrealtime,suchthatineachcycletheaverageofI.INTRODUCTIONthechop

5、pedwaveformattheswitchoutputisexactlyequaltoACchopperisregardedinrecentyears.Ithastheinputthecontrolreference.Thesampledsignalofonecyclecontrolcurrentclosetothesinewaveandbetterpowerfactorcircuitisnotpickedfromoutputvoltage,butfromchoppedperformancewhichcanreduce

6、sizeoffiltergreatlyandhasbeenvoltage.Whenthereisaperturbationhappenedininputvoltage,widelyusedinindustryapplicationssuchaslightingdimmers,thecontrollercanmakeresponsefast.Thisrevealsthatoneindustrialheater,soft-startingofinductionmotorsandspeedcyclecontrolhasrapi

7、ddynamicresponseperformanceandgoodcontrolofpumps.Mostofacchoppersusuallyuseopen-looptrackcharacteristic.control[1-4].ThereareonlyseveralreportsusingvoltageFig.2showstheworkprincipleofacchopperwithonecycleinstantaneousvaluePIcontrol[5].Comparingwithopen-loopcontro

8、l.Theinputvoltageofmaincircuitisfrompowernetworkcontrol,thiskindofclosed-loopcontrolcanenhancesystemvoltage.Twobidirectionalswitchingarechargeofchoppingandstab