DTC-SVM based on active disturbance rejection control applied on sensorless induction motor

This work addresses the problem inherent in internal induction motor parameters variation during the operation, which significantly degrades the performance of a direct torque controlled (DTC-SVM), DTC-SVM scheme is the alternative to the classical DTC schemes based on space vector modulation (SVM) strategy that minimizes the torque ripples is introduced in the first part of this work. In order to overcome these disturbances, we present in the second part of this paper a new robust command called Active disturbance rejection control (ADRC) which has been acquired an important concern of researchers and developed to ensure good dynamic performance of induction machine. ADRC can precisely estimate the derivative signals owing to extended state observer (ESO), the basic element of ADRC and accurate decoupling of induction motor is attained. The third part of the paper deals with the description of an Advanced SM-MRAS observer based on a combination of sliding mode designed for speed estimation is investigated in this work. In the last part, the proposed schemes shown in simulation results demonstrate the good efficiency, adaptability and robustness of sensorless induction motor against the internal as well as the external disturbances.