DTC two level and three level inverters of Induction Motor with speed control using Fuzzy Logic Controller

This paper is to present and to compare the DTC applied to an induction motor (IM) fed by two-level and three level inverters voltage. Direct torque control (DTC) of induction motors fed by a two level inverters has drawbacks like more torque, flux and current ripples in steady state. All these drawbacks can be overcome by DTC of induction motor fed by a three level inverters. Three level inverters has several advantages over the standard two-level, such as a greater number of levels in the output voltage waveforms, lower dV/dt, less harmonic distortion in voltage and current waveforms and lower switching frequencies. In this paper, a fuzzy logic controller is proposed instead of a PI classic corrector to improve the speed performance of the drive. To demonstrate the great advantages of using a three-level inverters type NPC and a fuzzy logic controller of speed of induction motor, simulation results using Power System Blocset (PSB) of Matlab / Simulink are presented.