Damping of inter-area and local modes by use of controllable components

This paper deals with damping of inter-area and local electromechanical oscillation modes using controllable series capacitor (CSC) and controllable shunt capacitor (SVC). The impacts of SVC and CSC on the structure of the system closed loop matrix are investigated. By analyzing the sensitivities of the system inter-area and local modes to the control action of the controllable devices, some general conclusions concerning the damping of inter-area and local modes are made. A numerical example is provided to support the analytical findings. This paper provides an insight and understanding in the basic characteristics of damping effects of the studied devices. The insight is obtained by the study of a simple power system which exhibits both inter-area and local power swings. The understandings and findings could form the basis in analysis of realistic and more complex systems.<>