Abstract
This paper proposes a new sensorless method for the vector control of grid-connected doubly-fed induction machine (DFIM) drive. The proposed sensorless method is based on the model reference adaptive controller (MRAC) which utilize instantaneous and steady state values respectively of a fictitious quantity obtained as the difference between two fictitious ratios of rotor voltage to current along the d-and q-axes for the reference and the adaptive models. The dimension of this fictitious quantity is ohm (Ω) and has no physical significance. The proposed method does not require any estimation of flux and is also independent of stator and rotor resistance variations. The proposed sensorless method also shows stable performance in the regenerating mode of operation of DFIM. All the detailed simulation study is done in MATLAB/Simulink and experimentally validated through adSPACE-1104-based DFIM laboratory prototype.
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