ROBUST DTC OF AN ADJUSTABLE SPEED SENSORLESS SWITCHED RELUCTANCE MOTORS BASED ON SVM USING A PI PREDICTIVE CONTROLLER

Abstract

In This study presents a new sensorless direct torque control method for voltage inverter fed RSM. The control method is used a modified Direct Torque Control scheme with constant inverter switching frequency using Space Vector Modulation (SVPWM). The variation of stator resistance due to changes in temperature or frequency deteriorates the performance of DTC-SVM controller by introducing errors in the estimated flux linkage and the electromagnetic torque. As a result, this approach will not be suitable for high power drives such as those used in tractions, as they require good torque control performance at considerably lower frequency. A novel stator resistance estimator is proposed. The estimation method is implemented using the Extended Kalman Filter. Finally, extensive simulation results are presented to validate the proposed technique. The system is tested to change in value of the stator resistance and a very satisfactory efficiency was obtained..