Space Vector Pulse Width Modulation for Three Phase Cascaded H-Bridge Inverter

This paper presents the Space Vector Pulse Width Modulation technique (SVPWM) for Multilevel Cascaded H-Bridge Inverter (CHB Inverter) with a Resistive-Inductive Load (R-L Load) and an equal DC voltage source. Cascaded H-Bridge Inverter generate a large number of voltage vectors and redundant switching states, it create a problem of computational complexity in multilevel inverter. A simple space vector pulse width modulation strategy is proposed to approximate the reference vector, and the calculation of dwell time becomes very simple. Space Vector Modulation has a, numbers of features; good utilization of the DC-link voltage, low current ripple, low harmonic distortion (THD) and reduce switching losses. A three phase multilevel cascaded H-bridge Inverter has been constructed, and simulation results are presented to verify the theoretical study of the system model.