双向电压型高频链逆变器的数字化控制策略研究

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1、分类号L『Dc密级由壑编号——中国科学院研究生院博士学傅论文y808姐3渔焦尚指导教师塾左硒究虽申请学位级别擅主学科专业名称电血电王生鱼左佳动论文提交日期——论文答辩日期．培养单位生国型堂院电王班塞压学位授予单位主国型堂瞳班塞生瞳答辩委员会主席StudyonFullDigitalizedControlSchemesofBi—directionalVoltageModeHigh-frequencyLinkInverterShaDeshang(PowerElectronicsandElectricalDrive)DirectedbyProfessorKongLiAbstractInthis

2、paper，thehistoryofvoltagemodehigh—frequencylinkinvertersisreviewed．Thepresentcontr01．schemesaresummarizedandtheadvantagesanddisadvantagesoftheschemesareanalyzed．Accordingtothecontrolschemesofbi—directionaIvoltagemodehigh—frequencyIinkinverters，fivedifferentcontrolschemesareproposedinthispaperand

3、theirworkingprinciplesayeanalyzedrespectively．Firstly,aschemecalledhigh—frequencyswitchingpointpresentbasedonvoltageRMSvaluefeedbackisproposed，theschemeissimpleandverifiedbytheprototypeexperimentalresults．TheoutputvoltageWiththisschemeCanberegulatedwithoutstepandstaticerrorwiththisscheme．Secondl

4、y,toimprovethedynamicresponseperformance，twomethodsbasedOninstantaneousvoltagevaluefeedbackarepresented．oneiScalledoddfunctionsymmetrySPWPMandtheotheriScalledevenfunctionsymmetrvSPWPM．BotIlofthemareverifiedbytheoreticaIanalysis．TheSPWMwavetransmittedbyhigh·frequencytransformerisanalyzedbyFourier

5、analysisandsomeimportantconclusionsabouttheharmonicsoftheSPWPMspectrumcanbedrawn。andwhat’Smore，theroleoftheswitchingstatesofhigh—frequencyinverterswitchesunderdifferentconditionsCanbea

6、sogot．ThefeasibilityofthetwoproposedmethodsisverifledbythesimulationresultswithSaberandexperimentalresults．Thep

7、rototypehasgoodperformanceofdynamicandstaticresponse．Thirdly，Amethodcalledbipolardoublemodulationwaves(BDMW)ispresentedandtheoperationprinciplesareanalyzed．ThequalificationconditionisdeducedtosatisfyCCMofinduetorcurrent．Thesimulationresultsandexperimentresultsshowthatswitchesofhigh—frequencylink

8、invertercarlberealizedwithZVSonandoffandswitchesofcycloconvertercallberealizedwithZCSonandZVZCSoff,inthiswaytheinherentvoltagesurgeofcycloconvcrterwhencommutationcanbesolvedwithoutaddinganysnubberorclampcircuits．Theobstacleo