4、uipment,thepowerelectronicwith highvoltageandhigh power ismoreandmorewidely. Dueto the limitation ofdevicemanufacturingprocess, thereisacontradictionbetweenthe large powerhandlingcapability andswitchingfrequency,usually thepowerlevel ishigher,theswitchingfrequency i
6、ndcontrolstrategyofModularMultilevel Converter(MMC).Thispaperfirstlyoutlinesseveraltypical topologyandcontrolstrategyof multilevelconverters, proposed carrierphaseshiftedSPWM(CPS—SPWM) technologyismoresuitablefor use in the MMC. Secondly,thispaper putsadetailanalysi