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20世纪人类最伟大的20项科技成果 电力电子装置的分类电力电子技术发展电力电子系统问题电力电子装置的技术指标通讯基础电源的系统Objective:maintainv(t)equaltoanaccurate,andconstantvalueV. Therearedisturbancesdueto •inputvg(t) •loadR ThereareuncertaintiesincomponentvaluesObjectiveofmodelingtheconverterHowtomodeltheconverterorinverter isthegoalofthiscourse?ModelingofCCMDC/DCconverter ModelingofDCMDC/DCconverter ModelingofDC/DCconverterwithcurrentpeakcontrol CompensationdesignforDC/DCconvertersystem Modelingofsinglephaseinverter ModelingofThreephaseinverterorconverterChapter1 ModelingofCCMDC/DCconverterDeveloptoolsformodelingofCCMDC/DCconvertersystems HowdoACvariationsinvg(t),R,ord(t)affecttheoutputvoltagev(t)? Whatarethesmall-signaltransferfunctionsoftheconverter?Capturedominantbehaviorandignoreinsignificantphenomena Simplifiedmodelyieldsphysicalinsight,allowingengineertodesignsystemtooperateinspecifiedmanner DC/DCconvertersystem(staticstate) DandDmareconstants,|Dm|<<D frequencyismuchsmallerthantheconverterswitchingfrequencyContainsfrequencycomponentsat: •Modulationfrequencyanditsharmonics •Switchingfrequencyanditsharmonics •SidebandsofswitchingfrequencyInput-outputrelationshipInput-outputrelationshipconsideringACcomponents Approach: •Removeswitchingharmonicsbyaveragingthewaveformoverone switchingperiodAveragingtoremoveswitchingrippleExplanationFiltercharacteristicsFunctionofaveragingoperatorInductorequation: DividebyLandintegrateoveroneswitchingperiod: Left-handsideisthechangeininductorcurrent.Right-handsidecan beexpressedasaverageinductorvoltagemultipliedbyTs/L asfollows: Thenetchangeininductorcurrentoveroneswitchingperiodis equaltotheperiodTsmultipliedbytheaverageslopeEulerformulaEquationsforinductorandcapacitorCCMBuck-boostconverterexampleStage1:Switchinposition1Stage2:Switchinposition2AveragetheinductorvoltageAveragecapacitorcurrentAccordingto Buck-boostinputcurrentwaveformisConverteraverageequationsPerturbationandlinearizationConstructsmall-signalmodel: LinearizeaboutquiescentoperatingpointIntroducetheperturbatio