Abstract
In this paper, the Model Reference Adaptive System (MRAS) based speed estimation technique is proposed which estimates the rotor speed/position in a vector controlled Synchronous Reluctance Motor (SynRM) drive to give the successful speed sensorless operation of the drive. The functional candidate chosen to build the MRAS system is the reactive power quantity ‘Q’ expressed in terms of voltages and currents in the rotor reference frame (dq-axes). The advantage of using reactive power ‘Q’ as the functional candidate is that it eliminates the presence of stator resistance in the adjustable model thus making the speed estimator independent to stator resistance variations. Apart from it, the speed estimator is free from derivative and integrator terms in the adjustable model. Also, the speed estimator involves simple processing and is not hardware intensive like injection-based speed estimators available in the literature. Finally, the effectiveness of the proposed speed estimator is verified through exhaustive simulations carried out in MATLAB/SIMULINK platform.
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