Close HARMONIC ANALYSIS OF A NOVEL MULTILEVEL INVERTERWITH REDUCED SWITCHES USING GENETIC ALGORITHM

Abstract

In recent years the Multilevel Inverter (MLI) has become familiar in Industrial applications. Specifically MLI is used for medium voltage and high power applications. In this paper, a MLI has been suggested with minimal number of semiconductor switches and a suitable switching technique is used to minimize the lower order harmonics. Among the various Pulse Width Modulation(PWM) techniques, Selective Harmonic Elimination Pulse Width Modulation (SHEPWM) is used in this paper. The solutions for the SHEPWM based nonlinear equations are solved meta-heuristic Genetic Algorithm (GA). The optimal values of the switching angles for a given modulation index is found. These result increases the degree of freedom. The seven level MLI is chosen, as the case study for implementation. The results are analyzed for the Total Harmonic Distortion (THD). This circuit can be extended for any levels. The result of simulation is compared with experimental values.