Abstract
This work presents the comparison of hybrid carrier Pulse Width Modulation (PWM) techniques for the chosen three phase Cascaded Multi Level Inverter (CMLI). In this paper, a CMLI is controlled with Sinusoidal PWM technique with Alternative Phase Opposition and Disposition and Carrier Overlapping (APOD + CO), Alternative Phase Opposition and Disposition and Phase Shift (APOD + PS), Alternative Phase Opposition and Disposition and Variable Frequency (APOD + VF), CO + VF, CO + PS, Phase Disposition and Variable Frequency (PD + VF), PS + PD, PS + VF , APOD + PD and CO + PD and the variation of Total Harmonic Distortion (THD) in the outputs is observed for various modulation indices m a . Simulation is performed using MATLAB-SIMULINK. It is seen that sinusoidal reference with PS+PD provides output with relatively low distortion. CO+VF PWM strategy is found to perform better since it provides relatively higher fundamental RMS output voltage and relatively lower stress on the devices.
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