Parallel MRAS rotor speed and stator resistance estimation for DTFC-SVM of a sensorless IMD

This paper presents, a rotor speed and stator resistance estimation under very low speed operating region using parallel rotor speed and stator resistance estimation scheme. This scheme is an extension of rotor flux based model reference adaptive system (MRAS) scheme. In this scheme the rotor speed and parameter variation is estimated using MRAS technique. The estimated speed is incorporated as a feedback to the space vector modulation based direct torque and flux control (DTFC-SVM) of induction motor drive (IMD). The rotor flux based MRAS method unable to provide satisfactory performance under parameter variation whereas this scheme can cope with the parameter variation and able to provide satisfactory performance. In order to show the effectiveness of the proposed method, it is simulated in MATLAB/SIMULINK environment. The performance of the IMD is simulated under various operating situations.