RANDOM PULSEWIDTH MODULATION TECHNIQUE FOR A 4-LEVEL INVERTER

Random Pulse Width Modulation (RPWM) technique for a 4-level inverter in open-end winding induction motor configuration is proposed in this paper. Reference voltage space vector is randomly sampled and it is realized in average sens e by switching its three nearest vectors. Switching frequency is randomly varied within the bounds to get randomly s paced samples. The method requires no sector identification. The reference phasor is converted into a vector lying in the basic 2-level inverter to calculate switching time vectors.