DAMPING OF POWER-SYSTEM OSCILLATIONS BY USE OF CONTROLLABLE COMPONENTS

This paper deals with damping of power system electromechanical oscill ations using controllable series compensators (series capacitors and p hase shifters) and controllable shunt capacitors. The study is based o n investigation of the eigenvalues of a simple linearized power system model. The controllable series components are located on the transmis sion line connecting two areas and the controllable shunt capacitor is located close to a load. It is shown that the level of transmission l ine loading, load characteristics and inertia of the two areas influen ce the damping achieved by the controllable components to different de grees. The contributions of the controllable series components to the enhancement of power system damping for the same rating of the control lable components are compared. Numerical examples are provided to veri fy the theoretical findings. The purpose of this paper is to provide a n insight and understandings in the basic characteristics of the dampi ng effects of the studied devices. This insight is obtained by study o f a simple power system that exhibits power oscillations. The understa ndings and findings can facilitate the analysis of realistic, and more complex power systems.