APPLICATION OF FACTS TECHNOLOGY IN POWER SYSTEMS FOR MITIGATION OF SUB SYNCHRONOUS OSCILLATION DAMPING

In its most general expression, the FACTS concept is based on the substantial incorporation of power electronic devices and methods into the high-voltage side of the network, to make it electronically controllable (IEEE/CIGRE, 1995). Many of the ideas upon which the foundation of FACTS rests evolved over a period of many decades. Nevertheless, FACTS, an integrated philosophy, is a novel concept that was brought to fruition during the 1980‘s at the Electric Power Research Institute. FACTS looks at the ways of capitalizing on many breakthroughs taking place in the area of high-voltage and high current power electronics, aiming at increasing the control of power flows in the high voltage side of the network during both steady-state and transient conditions. Power electronic devices have had a revolutionary impact on the electric power systems around the world. The availability and application of thyristors has resulted in a new breed of thyristor-based fast operating devices devised for control and switching operations. This paper deals with basic operating principles of FACTS devices and provides detailed discussions about the structure, operation, and modeling of the SVC, TCSC, STATCOM and the UPFC.