Rotor current based MRAS observer for doubly-fed induction machines

A new control strategy for sensorless vector control of doubly-fed induction machines is presented. The system is based on a rotor current model reference adaptive system (MRAS). The output of the observer is the rotational speed and rotor position angle is used to modulate/demodulate the rotor currents and voltages. A small-signal model is analysed. Experimental results for a stand-alone doubly-fed induction generator are presented.