A new speed sensorless SVM-DTC in Induction motor by using EKF

This paper presents a novel speed sensorless Direct Torque Control (DTC) technique based on Space Vector Modulation (SVM) for three-phase Induction motors (IMs). Basic principles of conventional speed sensorless SVM-DTC using Extended Kalman Filter (EKF) is described. Then a new speed sensorless SVM-DTC approach to address associated problems with conventional speed sensorless SVM-DTC is proposed. The proposed method uses two non-identical EKF, which provide simultaneous estimation of rotor and stator resistance. Performance of the proposed technique is assessed under challenging rotor and stator resistance variations using MATLAB/SIMULINK. Simulation result shows that using two EKF provides accurate estimation of flux, current and speed.