An Extended Kalman Filter For Sensorless Direct Torque and Field Controlled PMSM Speed Drive Using SVM Approach

Abstract

In this paper a speed sensorless Direct Torque and Flux Control (DTFC) method based on space vector modulation (SVM) and extended Kalman Filter (EKF) is proposed. This method is based on the PMSM models in the coordinate of stator flux linkage, flux and torque are controlled through stator voltage components in stator flux linkage coordinate axes and space vector modulation is used to control inverters. Simulation results verify that this proposed sensorless DTFC scheme could effectively decrease flux and torque ripples, and the speed estimation method could accurately track the motor speed and has good dynamic and static performance.