Research on triple line-voltage cascaded converter for the medium and high voltage rectifier

Inthispaper,anovelthree-phaserectifierbased on triple line-voltage cascaded VIENNA converter(LVC-VC) has been proposed,which could be the high power factor rectifier under high powervoltage.Comparedtoconventionalthree-phasecascadedH-bridgeconverters,intheproposednew multilevelconverters,andfewerswitchesanddccapacitorsarerequiredundersimilaroperatingconditions.Basedonthestudytotheoperationprincipleofthenewconverter,thepowerfactorcorrectionof theproposedconverterisrealizedbyemployingtraditionalone-cyclecontrolstrategy,thecarrierphaseshiftingmodulationisdesignedtoreducetheacvoltageharmonic.Thedcsidecapacitorvoltagesteady statemathematicalmodelisdeduced,thescopeofthedcsidecapacitorvoltageiscalculated,thecontrollersofdc-linkvoltagesofthethreeViennarectifiermodulesaredesigned.Simulationandexperimentalresultsverifiedtheavailabilityofthenewproposedmultilevelconverterandthevalidityofthecorrespondingcontrolstrategyapplied.