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基于扩张状态观测器估计补偿的Buck变换器带恒功率负载无源控制.docx

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基于扩张状态观测器估计补偿的Buck变换器带恒功率负载无源控制 Title:EstimationandCompensationofaBuckConverterwithConstantPowerLoadUsingExpansionStateObserverforPassiveControl Abstract: Inrecentyears,therehasbeenagrowingdemandforefficientpowerconversionsystemstomeettheincreasingenergydemands.Buckconvertersarewidelyusedinvariousapplicationsduetotheirabilitytoefficientlystep-downvoltagelevels.However,thepresenceofnon-linearcomponentssuchasconstantpowerloads(CPL)canintroducechallengesincontrollingtheoutputvoltage.ThispaperproposesanovelapproachforestimatingandcompensatingabuckconverterwithaCPLusinganexpansionstateobserverforpassivecontrol. Introduction: Theconstantpowerloadisanon-linearcomponentthatoftenvariesitsimpedancewiththeoutputvoltage.Asaresult,itbecomesdifficulttoregulatetheoutputvoltageofabuckconverterinthepresenceofaCPL.Variouscontroltechniqueshavebeenproposedtotacklethisissue,includingactivecontrolmethodsthatrequirecomplexalgorithms.Inthispaper,weproposeapassivecontrolstrategybasedonanexpansionstateobservertoestimateandcompensatefortheeffectsoftheCPLonthebuckconverter. Methodology: Theexpansionstateobserverisastate-of-the-arttechniquethatallowsfortheestimationofsystemstatesusingonlythemeasuredinputandoutputsignals.Itreliesontheassumptionthatthesystemcanbemodeledaslinearundercertainconditions.Byexpandingthesystemdynamicsaroundanoperatingpoint,theobservercanestimatethedeviationscausedbythenon-linearitiesinthesystem. Theproposedmethodinvolvesthefollowingsteps: 1.Modelingthebuckconverter:First,thedynamicequationsofthebuckconverterwithaCPLarederived.Themodeltakesintoaccountthenon-linearbehavioroftheCPLandthevoltageregulationfeedbackcontrolloop. 2.Expansionstateobserverdesign:Theexpansionstateobserverisdesignedtoestimatethesystemstates,includingtheoutputvoltage,dutycycle,andtheimpedanceoftheCPL.Theobserverutilizesthemeasuredinputandoutputsignalstoestimatethesystemstates. 3.Compensationstrategy:Basedontheestimatedstates,acompensationstrategyisdevelopedtocompensatefortheeffectsoftheCPLonthebuckco