ZSsource inverterSdue to theSdirectSimplementation ofSthe lower bridge arm,Sto avoid theSdead zoneSis introduced,ScanSimprove the safety of inverter system,Sreduce the harmonicScontent ofSoutput of theSinverter andSbecome a hotSresearch.SBy introducing the Z sourceSnetworkSin front ofSthe traditionalSthree level inverter,SaSZSthree level inverter.SBased on theSworking principle of singleSZ sourceSthree level inverter,SSPWM modulation strategySwith reference to the traditionalSthree level,Ssimple boostScontrol principleSof Z source inverter,Swere studied. TheSimproved carrier phase disposition andSimprovedSbyScascadingStwoScarrierSsine modulation method,Sthe simulation experimentSand theScorrespondingSto validate theStwo modulationSstrategy.