Analysis and Simulation of Multi Level Inverter Fed Induction Motor Drive

This paper presents the simulation of cascaded multilevel inverter fed induction motor drive. The poor quality of voltage and current of a conventional inverter fed induction machine is due to the presence of harmonics and hence there is significant level of energy losses. To obtain high quality sinusoidal output voltage with reduced harmonics, multi carrier based Sinusoidal pulse width modulation(MSPWM) control scheme is proposed for cascaded H bridgemultilevel inverter. The field orientation control techniqueis used to control the speed of induction motor by controlling the quadrature axis current using PI speed regulator. The proposed system is an effective replacement for the conventional method which produces high switching losses results in poor drive performance. The simulation results reveal that the proposed circuit effectively controls the motor speed and enhances the drive performance through reduction in total harmonic distortion (THD). The effectiveness of the system is verified through simulation using PSIM Simulink software