Three-level NPC inverter with the help of SVPWM

space vector pulse width modulation (SVPWM) switching technique which is used in neutral point clamp invertor for the purpose of switching.

space vector pulse width modulation (SVPWM) switching technique which is used in three phase invertor for the purpose of switching.

Three level Neutral Point Clamped (NPC) inverters are a family of multilevel power converters that are characterized by the use of clamping diodes for guaranteeing the proper voltage sharing across the power switches.

Each leg of the NPC inverter has 4 transistors that can be controlled, giving 2^4 = 16 total possible states.

There exist a total 27 switching combinations, out of which three are null or zero vectors, 12 are small, 6 are large and 6 are medium vector.