DESIGN AND IMPLEMENTATION OF HYBRID SPWM CONTROL FOR CASCADED H-BRIDGE MULTI LEVEL INVERTER FOR MOTOR DRIVES

In this paper, present the performance of hybrid modulation technique for soft switched cascaded five level inverters. The proposed modulation schemes are hybrid alternative phase opposition, hybrid phase shift carrier, hybrid single carrier sinusoidal PWM schemes. It inherits the switching loss reduction along with reduced harmonic performance of cascaded multilevel inverter fed drive system. The inverter topology used here has recently suggested in the area of high power medium voltage applications. The performance of this cascaded inverter has been analysed and compared with the results obtained from theory and simulation. Simulation study of the inverter employing the proposed HAPOD, HPSCPWM, HSCSPWM strategy has been done in MATLAB/SIMULINK. Among these three modulation schemes the efficient strategy is employed in the hardware implementation of hybrid multilevel inverter.