A NOVEL CASCADED MULTILEVEL INVERTER USING MCPWM WITH REDUCED HARMONICS

This paper deals with Single Phase Five level Inverter using Multi Carrier Based Pulse width modulation Technique. The multilevel inverter is used to improve the voltage quality by reducing the harmonics, as the number of voltage levels of multilevel inverter is increased the harmonics are reduced and hence losses are minimized significantly. We have considered the Flying Capacitor Multilevel Inverter (FCMLI), the Neutral Point Clamped or the Diode Clamped Multilevel Inverter and the Cascaded H-Bridge Multilevel Inverter. The comparison between these inverters is based on the % of THD present in the output voltage. The performance of chosen FCMLI is confirmed through MATLAB SIMULINK based simulation. It is observed that sinusoidal reference with PODPWM provides output with relatively low distortion. The simulation of single phase cascaded five level multilevel is done using Multicarrier PWM technique and compared with steps wave. Hardware module is designed for as stepped wave and multicarrier PWM signal. The outputs of both simulation and hardware are analyzed