Speed Sensorless Direct Torque Control of Doubly Fed Induction Motor Using Model Reference Adaptive System

This study emphasis on a direct torque control (DTC) strategy with a speed estimator utilizing the Model Reference Adaptive System (MRAS) for a doubly fed induction machine (DFIM). The suggested adaptive reference model uses the values obtained as the disparity between two voltage-to-current ratios along the d and q axes for a hypothetical resistance quantity. The resulting sensorless formulation is totally independent of any expression of stator/rotor resistance. And thereby, DTC command brings numerous benefits over traditional control strategies like field-oriented control (FOC) due to its clear architecture, quick dynamic response and less system parameter dependency. The suggested control algorithm is simulated and evaluated in MATLAB/Simulink for a small speed range program.