Use of FACTS devices in Mitigating Subsynchronous Resonance

Abstract

This study evaluates the use of Flexible Alternating Current Transmission System (FACTS) devices in mitigating Subsynchronous Resonance (SSR). SSR is defined as a condition wherein an electrical network exchanges energy with a turbine generator at one or more of the natural frequencies of the combined systems below its synchronous frequency. The presence of SSR in a system can lead to catastrophic outcomes, and the application of FACTS devices has been found to be one of the most effective approaches to reduce SSR. The study investigates the core concepts associated with FACTS devices and SSR. The concepts underlying SSR interactions, including self-excitation and transient torques, are examined in this study. The study also focuses on the use of FACTS devices in mitigating or eliminating SSR from the system or network of interest. The results of simulations conducted by using eigenvalue analysis and the IEEE second benchmark model are also presented and discussed.