輕型直流輸電主電路拓撲及調(diào)制方式研究

1、合肥工業(yè)大學碩士學位論文輕型直流輸電主電路拓撲及調(diào)制方式研究姓名：譚玉茹申請學位級別：碩士專業(yè)：電力電子與電力傳動指導教師：蘇建徽201203ResearchonmaincircuittoDologVandmodulationofKeSearCnOnmalnClrCUltt0D0109VandmodUIatlon0tHVDC—HightABSTRACT’IheHVDC—LightoVercomestheinherentdefectsof

2、thecOnVentiOnalHVDC，itcanenhancethestabilityoftheexchangesystem，reducesystemlosses，recoverfastaftertheaccident，andfacilitateelectricitytradingfunctionsThemaincircuittopologyofinVerterrelatedtothesystemoperatingcharacteri

3、sticsandtheVoltageandpowerleVelsThetraditionaltwoleVelandthree—leVelVoltagesourceconVerterrequirehighdynamicandstaticpressurecharacteristicsofpowerelectronicdeVicesThiswillimpacttheHVDCLighttechnologydeVelopmenttoahigher

4、powerratingNewconvertertopologyanditsmodulationaremodetobestudiedModularmulti—leVelconVerterimproVestheoutputVoltageleVelnumberbyincreasingthenumberofsub—moduleItcanbeeasilyextendedtohigherVoltageandpower1evels，andalsoit

5、’sabletousemorematurestandardcomponentssuchasindustrialpressurecapacitanceandstandardACadapter，whicharemoreflexibleandpracticalThisarticleselectsmodularmultileVelinVerterasthemaincircuittopologyoftheHVDC—Lightandstudythe

6、modulationmodecontr01strategyThemaincontentsofthisarticleareasfollows：1、AnalyzeandconlpareaVarietyofinVertermaincircuittopologyandseVeralmulti—levelmodulation，considersthatthemodularmulti1evelinVertertopologyismoresuitab

7、lefortheHVDC—Lighttechnology2、Studythesteady—statecharacteristicsoftheHVDC—Light，decomposeitscontrolsystem，andfocusontheconVerterValVeleVelcontrolstrategyThenanalyzetheworkingprincipleandmathematicalmodelingofmodularmult

8、i—leVelCOnverter3、InVestigatethetechnicaldifncultiesofmodularmultileVelinVerterfortheHVDC—Lightsystem，Proposeadesignmethodofmaincircuitparameter，aswellassub—modulecapacitorprechargingandcapacitanceVoltagebalancingcontrol

9、strategy4、AnalysistheprincipleofcarrierphaseshifCedSPWM，explorethefeasibilityformodularmulti—leVelinVerterThenproposeanewtypeofcarrierphase—shiftedSPWMmethod，whichisVerinedbysimulation5、Proposeaimplementationschemeofexpe