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外文翻译--开环PWM控制技术.doc

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外文翻译--开环PWM控制技术.doc

附录OPENLOOPPWMCONTROLTECHNIQUESSINUSOIDALPWMSPWMSPWMTECHNIQUEISONEOFTHEMOSTPOPULARMODULATIONTECHNIQUESAMONGTHEOTHERSAPPLIEDINPOWERSWITCHINGINVERTERSINSPWM,ASINUSOIDALREFERENCEVOLTAGEWAVEFORMISCOMPAREDWITHATRIANGULARCARRIERWAVEFORMTOGENERATEGATESIGNALSFORTHESWITCHESOFINVERTERPOWERDISSIPATIONISONEOFTHEMOSTIMPORTANTISSUESINHIGHPOWERAPPLICATIONSTHEFUNDAMENTALFREQUENCYSPWMCONTROLMETHODWASPROPOSEDTOMINIMIZETHESWITCHINGLOSSESTHEMULTICARRIERSPWMCONTROLMETHODSALSOHAVEBEENIMPLEMENTEDTOINCREASETHEPERFORMANCEOFMULTILEVELINVERTERSANDHAVEBEENCLASSIFIEDACCORDINGTOVERTICALORHORIZONTALARRANGEMENTSOFCARRIERSIGNALTHEVERTICALCARRIERDISTRIBUTIONTECHNIQUESAREDEFINEDASPHASEDISSIPATIONPD,PHASEOPPOSITIONDISSIPATIONPOD,ANDALTERNATIVEPHASEOPPOSITIONDISSIPATIONAPOD,WHILEHORIZONTALARRANGEMENTISKNOWNASPHASESHIFTEDPSCONTROLTECHNIQUEINFACTPSPWMISONLYUSEFULFORCASCADEDHBRIDGESANDFLYINGCAPACITORS,WHILEPDPWMISMOREUSEFULFORNPC。EACHOFTHEMENTIONEDMULTICARRIERSPWMCONTROLTECHNIQUESHAVEBEENILLUSTRATEDINFIG1,RESPECTIVELYTHESINUSOIDALSPWMISTHEMOSTWIDELYUSEDPWMCONTROLMETHODDUETOMANYADVANTAGESINCLUDINGEASYIMPLEMENTATION,LOWERHARMONICOUTPUTSACCORDINGTOOTHERTECHNIQUES,ANDLOWSWITCHINGLOSSESINSPWMCONTROL,AHIGHFREQUENCYTRIANGULARCARRIERSIGNALISCOMPAREDWITHALOWFREQUENCYSINUSOIDALMODULATINGSIGNALINANANALOGORLOGICCOMPARATORDEVICESTHEFREQUENCYOFMODULATINGSINUSOIDALSIGNALDEFINESTHEDESIREDLINEVOLTAGEFREQUENCYATTHEINVERTEROUTPUTFIG1MULTICARRIERSPWMCONTROLSTRATEGIESAPD,BPOD,CAPOD,DPSFIG2ANSPWMCONTROLLEDINVERTERACOMPLETESYSTEM,BMODULATORBLOCKOFINVERTERMASWITCHINGFREQHZLINEVOLTAGESVLINECURRENTSASWITCHINGANGLETHDRATIOSTHDLINECURRENTLINEVOLTAGE106100020281619309341072520620002121619304469272306500020281627304171252140610,000206316282989088536508100027712158308308172608200029572294298654164917085000293823012996297336380810,0003039240429555011728911000351627313014828612110120003557276829784165178111500037729232967378326612110,000409132126624821423131210003851299830057955268141220003877302229924604842MASWITCHINGFREQHZLINEVOLTAGESVLINECURRENTSASWITCHINGANGLETHDRATIOSTHDLINECURRENTLINEVOLTAGE1512500038983247223410593210161210,00042593315264757220117141000399831123037434937181420004039315829934144643191450004244324728234832775201410,0004413333623537131531TABLE1CURRENTANDVOLTAGETHDANALYSISOFFULLBRIDGEINVERTERATHREEPHASEFULLBRIDGEINVERTERANDTHESPWMMODULATORTHATHASBEENDESIGNEDTOGENERATESWITCHINGSIGNALSFORTHREEPHASEFULLBRIDGEINVERTERISDEPICTEDINFIG2AANDFIG2BINTHEDESIGNEDTHREELEVELINVERTER,MODULATEDSPWMSIGNALSHAVEBEENUSEDTOCONTROLMOSFETSWITCHESOFTHEINVERTER,ANDTHD(TOTALHARMONICDISTORTION)ANALYSISOFOUTPUTVOLTAGEANDCURRENTHAVEBEENPERFORMEDASSEENINTABLE1THEDESIGNPARAMETERSWEREASFOLLOWS;DCVOLTAGEVDC300VMODULATIONINDEXMI06MI14SWITCHINGFREQUENCYFSW1KHZFSW10KHZLOADRESISTANCERL5ΩLOADIMPEDANCEL5MHRATEDPOWER10KVAINTHEHARMONICANALYSESOFSPWMCONTROLLEDINVERTERDESIGNEDUSINGSIMULINK;THELOWESTTHDFORCURRENTHASBEENMEASUREDAS088WHILEMODULATIONINDEXIS06ANDSWITCHINGFREQUENCYAT10KHZTHETHDFORLINEVOLTAGEHASBEENMEASUREDAS536FORTHESAMEOPERATINGCONDITIONSTHELINEVOLTAGEHASINCREASEDALMOSTPROPORTIONALTOEQ(1)INOVERMODULATIONRANGE,WHILEPROPORTIONALTOEQ2INLINEARMODULATIONRANGEINSPWMCONTROLTECHNIQUE,THEOUTPUTVOLTAGEISOBTAINEDINLINEARMODULATIONRANGE,(1)(2)ANOTHERAPPLICATIONHASBEENIMPLEMENTEDUSINGSPWMTECHNIQUETOCONTROLAFIVELEVELCHBMLIASSEENINFIG3THEDESIGNEDVSIISBASEDONTHETOPOLOGYOFFIG4WHICHINCLUDESDUALHBRIDGECELLSASSHOWNINFIG5PERPHASETOGENERATEAFIVELEVELOUTPUTVOLTAGETHEMAINTOPOLOGICALCALCULATIONSWHICHAREPERFORMEDINITIALLYINDICATETHEREQUIREMENTSOFMODULATORANDINVERTERBLOCKS,ANDALLOWOBTAININGAWELLPREPAREDMODULATIONALGORITHMTOINCREASETHEPERFORMANCEOFINVERTERFIG3ANSPWMCONTROLLEDFIVELEVELCHBMLICONTROLLEDINVERTERACOMPLETESYSTEM,BCHBMLIBLOCKFIG4THREEPHASEFIVELEVELTOPOLOGYOFCASCADEDHBRIDGEMULTILEVELINVERTERFIG5THREELEVELCHBMLI

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