In　modulation　strategies　for　three-level　neutral　point　clamped　(NPC)　converters　the　double　modulation　wave　carrier-based　PWM　(DMWPWM)　strategy　is　such　a　modulation　strategy,　by　which　the　neutral　point　voltage　control　under　the　entire　modulation　index　and　full　power　factor　can　be　achieved.　Firstly,　the　basic　principle　of　existing　DMWPWM　strategies　are　analyzed　and　the　relation　between　modulation　wave　in　DMWPWM　and　that　in　traditional　sinusoidal　pulse　width　modulation　(SPWM)　is　analyzed,　and　on　this　basis　a　DMWPWM　strategy　for　three-level　NPC　converter　is　proposed;　secondly,　in　the　aspects　of　total　harmonic　distortion　(THD)　characteristic　of　output　phase　voltage,　DC　voltage　utilization　and　switching　loss　of　the　device　the　proposed　DMWPWM　strategy　is　compared　with　traditional　SPWM　strategy　to　further　expound　the　features　of　the　proposed　method.　The　correctness　of　theoretical　analysis　is　validated　by　results　from　simulation　and　experiments.