Performance Improvement of DTC-SVM of PMSM with Compensation for the Dead Time Effect and Power Switch Loss Based on Extended Kalman Filter

Two algorithms have been extensively studied for motor control: Field Oriented Control (FOC) and Direct Torque (DTC). Both control use a Voltage Source Inverter (VSI) to drive Permanent Magnet Synchronous Motor (PMSM). To prevent short-arm short-circuit accidents when driving PMSM using VSI, dead time is used turn off the TOP BOTTOM switches of each arm at same time. However, this dead-time technique causes an unexpected pole voltage be applied on VSI output voltage, causing distortion resulting in nonlinearity. The disturbance that nonlinearity difficult measure directly with sensor. Therefore, paper analyzes controller due distorted caused by during operation DTC algorithm predicts extended Kalman Filter (EKF) improve stability. As result, proposed has verified improvement torque ripple stator flux through experiments simulations.