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1、杭州电子科技大学硕士学位论文ABSTRACTAsakindofadvancedpowerconverter,matrixconverterownsnumerousadvantagessuchassimpletopologicalstructure,nostoragecomponents,compactstructure,bidirectionalpowerflow,suitableforfourquadrantoperation,highcontroldegreeoffreedom,adaptiveinputpowerfactor,availablesinusoidi
2、nputcurrentandoutputvoltage,fasttransientresponseandlesswaveformdistortion,etc.Ithasbecomeahotissueinthefieldofpowerconverter.Firstofall,aimedatsolvingtheproblemsaboutslowresponseandlowpowerfactoroftheconventionalmatrixconverter,itistheschemeaboutthematrixconverterbasedonthespacevectorm
3、odulationalgorithmappliedtohighvoltagefrequencyconverterwhichispresented,combinedwiththecooperationprojectWL-Hvdrive_MbelongedtoHangzhouWolongElectricalInstitute.Andthenthetopologystructure,controlmethodandsomeexistingproblemsareintroducedbriefly.Secondly,theemphasisisputonthespacevecto
4、rmodulationofthematrixconverterandthemodulationstrategyofthevirtualequivalentAC-DC-ACisintroducedindetails.Asaconsequence,themathematicrelationshipbetweentheoutputlinevoltageandinputvoltageisobtainedaswellasthatbetweentheoutputlinecurrentandtheinputcurrent,deducingtheexpressionforthedut
5、yratioofmatrixconverterandthedeterminationmethodofswitchstatusboth.Adoptingthenestingdualspacevectormodulationstrategyisabletomaketheoutputlinevoltageandinputphasecurrentoftheconverterbeinlinewithsinusoidalvariation.Afterthecomparisonofthreekindsofconverterstrategies,itisthefourstepscom
6、mutationstrategyselectedtorealizethesecurityconversionstrategyofbidirectionalswitch,whichissimpleandreliablebasedonthevoltagesignaldetection.Thenthematrixconvertersimulationmodelisestablishedandthethree-phasevoltagesourcemodule,voltagedetectionmodule,inputfilter,controlstrategymoduleand
7、spacevectormodulationmoduleareintroduced.Thesimulationresultsshowthattheactualspeedcanfollowthereferencevaluewithfastresponsespeedwhenthemotorstarts,keepssteady-stateoperationandchangesitsspeed.Atthesametime,thethree-phaseoutputcurrentchangesaccordingtothesinewavewithsmallharmo
