Generalized optimization slip power recovery drives

A generalized method for predicting the optimized performance of the doubly fed induction motor controlled by a voltage phasor at the rotor side, at any load conditions in slip power recovery drives, in the steady state is presented. The equations describing the model of the optimally controlled drive are deduced in terms either of the voltage phasor magnitude or of one of its components, direct or quadrature. These equations are simple and hence suitable for digitally controlled systems. The electromagnetic characteristics in the steady state are determined and discussed for the case in which the voltage phasor magnitude and the speed vary. The control covers the full operating ranges for speed, torque, and voltage phasor magnitude