A 15-LEVEL ASYMMETRICAL CASCADED SUB MULTILEVEL INVERTER USING RES WITH PD-PWM TECHNIQUE

Abstract

Multilevel inverters have evolved as one of most commonly power conversion devices for variety of applications such as in medium voltage and high-power applications.  These inverters are an alternative to two-level inverters for the best benefits such as low harmonic distortion, less complex filters, better wave capability with a sinusoidal output, and reduced dv/dt up on the switches used. In this research work a 15 level H-bridge asymmetric multilevel inverter is proposed for renewable energy harvesting. The proposed inverter's basic module consists of a smaller number of switches i.e., seven, three blocking diodes and three asymmetric dc links. The proposed inverter is capable of producing seven positive voltage states, which are polarized negatively by the end-side H-bridge unit i.e., via polarity changer circuit.