Cascaded H-Bridge Multilevel Inverter Using Inverted Sine Wave PWM Technique

This paper proposes three phase Seven Level Cascaded H-Bridge Multilevel Inverter by using PD, POD, APOD, INVERTED SINEWAVE methods based on Sinusoidal PWM control techniques. There are 3 types of multilevel inverters named as diode clamped multilevel inverter, flying capacitor multilevel inverter and cascaded multilevel inverter. Compared to diode clamped & flying capacitor type multilevel inverters cascaded H-bridge multilevel inverter requires least no of components to achieve same no of voltage levels and optimized circuit layout is possible because each level have same structure and there is no extra clamping diodes or capacitors. However as the number of voltage levels m grows the number of active switches increases according to 2×(m-1) for the cascaded H-bridge multilevel inverters. By comparing the three methods the performance parameters are calculated. Performance analysis is based on the results of simulation study conducted on the operation of the multilevel inverters using MATLAB/ SIMULINK. The performance parameters chosen the work included fundamental output voltage and total harmonic distortion.