Power system optimal wide area control based on identified models

The contribution of this paper is the application of subspace system identification techniques to design a wide area controller for damping power oscillations. A state feedback linear control strategy based on model is proposed. The gains of the controller are obtained through a linear quadratic regulator (LQR) algorithm. The model is obtained through identification using available measurements of frequencies/speeds after applying perturbations like changes in reference of active or reactive powers. Simulations performed in PSS/E using IEEE 12 bus power system benchmark shows very good oscillation damping improvement. Three different test was evaluated which have different kind of perturbation.