Speed Sensorless DTC for Three-level Inverter-Fed Induction Motor using Different Observers

This paper studies speed sensorless Direct Torque Control (DTC) for 3-level inverter-fed induction motor using different observers. Indeed, the first part presents the DTC using 3-level inverter and the second part introduces three different observers: The Model Reference Adaptive System (MRAS), the Adaptive Luenberger observer and the Extended Kalman Filter (EKF). The last part shows the simulation results of all sensorless DTC schemes carried under Matlab/Simulink and compares their performances over a wide speed range.