Common Mode Voltage Elimination for Three-Level Five-Phase Neutral Point Clamped Inverter

This paper presents space vector modulation strategy for eliminating the common mode (CM) voltage of a three level five-phase neutral point clamped (NPC) voltage source inverter (VSI). There are two hundred and forty three discrete switching states available for operation and control of the NPC VSI. Out of two hundred and forty three switching states only fifty one switching states gives zero common mode voltage. The method reported in this paper, only thirty one switching states are selected from those fifty one switching states so that the xy voltage vector component is restricted.. The same switching states also give zero neutral point current and hence the dc link capacitor has equal voltage distribution. Simulation results are provided to validate the concept.