AN INVESTIGATION ON THE USE OF POWER-SYSTEM STABILIZERS FOR DAMPING INTER-AREA OSCILLATIONS IN LONGITUDINAL POWER-SYSTEM

This paper presents the progress of an investigation on the use of Pow er System Stabilizers (PSSs) to enhance damping of low-frequency inter -area modes in longitudinal power systems, a dynamic model of the Mexi can Interconnected System (MIS) is adopted to evaluate the potential f or small signal stability improvement by means of PSSs. Power oscillat ion flow studies, transfer function residues and controllability and o bservability characteristics are used to understand the nature of osci llation patterns, mode identification and PSSs siting. It is shown tha t PSSs can significantly enhance damping of modal oscillations, especi ally under high stress conditions.