TCSC controller design for damping interarea oscillations

Thyristor Controlled Series Compensator (TCSC), a prominent FACTS device, can rapidly modulate the impedance of a transmission line, resulting in improvement of system performance. The purpose of the work reported in this paper is to design a controller to damp interarea oscillations. We have applied the residue method to the linearized power system equations and obtained a generalized form which is suitable for different controller input/output channels and therefore suitable for different control devices. This method, together with modal sensitivities, is applied to TCSC to determine the location, feedback signal, and controller design. The damping result is illustrated by comparing changes in damping ratio and identifying the increase of transfer capacity.