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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OpenloopPWMcontroltechniquesSinusoidalPWMSPWMSPWMtechniqueisoneofthemostpopularmodulationtechniquesamongtheothersappliedinpowerswitchinginverters.InSPWM,asinusoidalreferencevoltagewaveformiscomparedwithatriangularcarrierwaveformtogenerategatesignalsfortheswitchesofinverter.Powerdissipationisoneofthemostimportantissuesinhighpowerapplications.ThefundamentalfrequencySPWMcontrolmethodwasproposedtominimizetheswitchinglosses.ThemulticarrierSPWMcontrolmethodsalsohavebeenimplementedtoincreasetheperformanceofmultilevelinvertersandhavebeenclassifiedaccordingtoverticalorhorizontalarrangementsofcarriersignal.TheverticalcarrierdistributiontechniquesaredefinedasPhaseDissipationPD,PhaseOppositionDissipationPOD,andAlternativePhaseOppositionDissipationAPOD,whilehorizontalarrangementisknownasphaseshiftedPScontroltechnique.InfactPSPWMisonlyusefulforcascadedHbridgesandflyingcapacitors,whilePDPWMismoreusefulforNPC。EachofthementionedmulticarrierSPWMcontroltechniqueshavebeenillustratedinFig.1,respectively.ThesinusoidalSPWMisthemostwidelyusedPWMcontrolmethodduetomanyadvantagesincludingeasyimplementation,lowerharmonicoutputsaccordingtoothertechniques,andlowswitchinglosses.InSPWMcontrol,ahighfrequencytriangularcarriersignaliscomparedwithalowfrequencysinusoidalmodulatingsignalinananalogorlogiccomparatordevices.Thefrequencyofmodulatingsinusoidalsignaldefinesthedesiredlinevoltagefrequencyattheinverteroutput.Fig.1.MulticarrierSPWMcontrolstrategiesaPD,bPOD,cAPOD,dPS.Fig.2.AnSPWMcontrolledinverteracompletesystem,bmodulatorblockofinvertermaSwitchingfreq.HzLinevoltagesVLinecurrentsASwitchingangleTHDratiosTHDLinecurrentLinevoltage10.61000202.816.19309.34107.2520.6200021216.19304.4692.7230.65000202.816.2730.41.7125.2140.610,000206.316.2829.890.885.3650.81000277.121.58308.3081.7260.82000295.722.9429.865.4164.9170.85000293.823.0129.962.9733.6380.810,000303.924.0429.555.0117.28911000351.627.3130.148.2861.211012000355.727.6829.784.1651.78111500037729.2329.673.7832.6612110,000409.132.126.624.8214.23131.21000385.129.9830.057.9552.68141.22000387.730.2229.924.6048.42maSwitchingfreq.HzLinevoltagesVLinecurrentsASwitchingangleTHDratiosTHDLinecurrentLinevoltage151.25000389.832.4722.3410.5932.10161.210,000425.933.1526.47.5722.01171.41000399.831.1230.37.4349.37181.42000403.931.5829.934.1446.43191.45000424.432.4728.234.8327.75201.410,000441.333.3623.537.1315.31Table1.CurrentandvoltageTHDanalysisoffullbridgeinverter.AthreephasefullbridgeinverterandtheSPWMmodulatorthathasbeendesignedtogenerateswitchingsignalsforthreephasefullbridgeinverterisdepictedinFig.2aandFig.2b.Inthedesignedthreelevelinverter,modulatedSPWMsignalshavebeenusedtocontrolMOSFETswitchesoftheinverter,andTHD(TotalHarmonicDistortion)analysisofoutputvoltageandcurrenthavebeenperformedasseeninTable1.ThedesignparameterswereasfollowsDCvoltageVDC300VModulationindexmi0.6mi1.4Switchingfrequencyfsw1kHzfsw10kHzLoadresistanceRL5ΩLoadimpedanceL5mHRatedpower10kVAIntheharmonicanalysesofSPWMcontrolledinverterdesignedusingSimulinkthelowestTHDforcurrenthasbeenmeasuredas0.88whilemodulationindexis0.6andswitchingfrequencyat10kHz.TheTHDforlinevoltagehasbeenmeasuredas5.36forthesameoperatingconditionsThelinevoltagehasincreasedalmostproportionaltoEq.(1)inovermodulationrange,whileproportionaltoEq.2inlinearmodulationrange.InSPWMcontroltechnique,theoutputvoltageisobtainedinlinearmodulationrange,(1)(2)AnotherapplicationhasbeenimplementedusingSPWMtechniquetocontrolafivelevelCHBMLIasseeninFig3.ThedesignedVSIisbasedonthetopologyofFig.4whichincludesdualHbridgecellsasshowninFig.5perphasetogenerateafiveleveloutputvoltage.Themaintopologicalcalculationswhichareperformedinitiallyindicatetherequirementsofmodulatorandinverterblocks,andallowobtainingawellpreparedmodulationalgorithmtoincreasetheperformanceofinverter.Fig.3.AnSPWMcontrolledfivelevelCHBMLIcontrolledinverteracompletesystem,bCHBMLIblock.Fig.4.ThreephasefiveleveltopologyofcascadedHbridgemultilevelinverterFig.5threelevelCHBMLI.

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