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Buck电路PID参数继电反馈自整定仿真分析.docx

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Buck电路PID参数继电反馈自整定仿真分析 Introduction Buckvoltageregulatorsarewidelyusedinpowerelectronicssystemsbecauseoftheirhighefficiencyandsimplicity.Ingeneral,abuckconverterisadc-dcconverterthatcanstep-downtheinputvoltagetoaloweroutputvoltage.TheperformanceofbuckconvertersisgreatlyinfluencedbytheProportional-Integral-Derivative(PID)controllerparameters.PIDcontrollerisafeedbackcontrolmechanismthathelpstoregulatetheoutputvoltageofabuckconverter.PIDcontrollerparametersareusuallydeterminedbasedonthecharacteristicsofthesystemandthedesiredresponse. Inthispaper,wepresentananalysisoftheBuckcircuitwithPIDcontrollerparametersusingrelayfeedbackauto-tuning.Relayfeedbackauto-tuningisapopularmethodusedtofindtheoptimalPIDcontrolparametersforasystem.ThesimulationresultsarepresentedusingMATLABandSimulink,andweanalyzetheperformanceofthebuckconverterwithdifferentPIDcontrollerparametervalues. BuckConverters Buckconvertersarewidelyusedinpowerelectronicssystemsbecauseoftheirhighefficiencyandsimplicity.Ingeneral,abuckconverterisadc-dcconverterthatcanstep-downtheinputvoltagetoaloweroutputvoltage.Buckconvertersconsistofapowerswitch,aninductor,andadiode.Thepowerswitchisturnedonandoffbyacontrolsignal,andtheinductoranddiodestoreandreleaseenergy,respectively. Theoutputvoltageofabuckconverterisregulatedbythedutycycleofthecontrolsignal.Byadjustingthedutycycle,theoutputvoltagecanbekeptconstantoverarangeofinputvoltageandloadcurrentconditions.TheregulationoftheoutputvoltageisaccomplishedusingaPIDcontroller. PIDControllers PIDcontrollersarewidelyusedincontrollersystemsbecauseoftheirsimplicityandeffectiveness.APIDcontrollerhasthreeterms:proportional,integral,andderivative.Theproportionaltermrepresentsthepresenterrorinthesystem,theintegraltermrepresentsthepasterrors,andthederivativetermrepresentsthefutureerrors. Theproportionaltermofthecontrollerprovidesadirectresponsetothepresenterrorinthesystem.Theintegraltermensuresthatthepreviouserrorsinthesystemaretakenintoaccount,andthederivativetermensuresthatfutureerrorsin