Five Level Output Generation for Hybrid Neutral Point Clamped Inverter Using Sampled Amplitude Space Vector PWM

Abstract: A space vector pulse width modulation signal generation for the five level hybrids neutral point clamped inverter using only the sampled amplitude of the reference phase voltage is proposed in this paper. This Pulse widthmodulation scheme generation in the inverter leg switching times, from the sampled reference phase voltage amplitude and centers the switching times for the middle vectors in a sampling interval. This PWM technique does not require any sector identification and it reduces the computational time compared with the conventional space vector pulse width modulation technique. In this technique the centering of the middle inverter switching of the SVPWM is achieved by the addition of the offset time signal to the inverter gating signal, derived from the sampled amplitude of the reference phase voltage.

Keywords: Neutral Point clamped multilevel inverter, SPWM, Sampled Amplitude Space Vector PWM Signal Generation.