Reduction Of Power Electronic Devices In Multilevel Inverter For Higher Voltage Level Fed With Induction Motor Drive

Abstract

In recent years, multilevel inverters have gained much attention in the application areas of medium voltage and high power owing to their various advantages such as lower common mode voltage, lower voltage stress on power switches, lower dv/dt ratio to supply lower harmonic contents in output voltage and current. This paper presents the simulation and implementation of multilevel inverter fed induction motor drive. The output harmonic content is reduced by using multilevel inverter. The proposed seven,twenty three,twenty seven and thirty three level cascaded Hbridge multilevel inverters require less number of components to obtain same number of voltage levels when compared to diode clamped and flying capacitor type methods. Due to that, the switching loss gets reduced as same like the harmonic distortion occurs in the motor drive gets reduced. Also, it generally regularizes the stair –case voltage waveform from several dc sources which has reduced harmonic content. The operational principle and key waveforms are analyzed and the performance of the proposed multilevel inverter is evaluated from the simulation results. The results has been compared to that of the existing techniques and found to be quite better than the existing ones.