Controller design for SVC and TCSC to enhance damping of power system oscillations

This article describes asystematic approach for the design of a supplem entary controller for static VAR compensators (SVC) and thyristor-controlled series capacitors (TCSC) to improve the damping of power system oscillatory modes. The problem is analyzed from the control point of view. The reduced order model of the power system is obtained using the Prony identification method; the residue and root locus methods are then used for controller design. It is noticed that by adjusting the controller gain according to the operating condition, better damping effects could be achieved. Dynamic simulations were performed to investigate the effect of the damping controller in increasing system dynamic stability. Simulation results show that with the designed controller installed, low frequency power oscillations are effectively damped.