Abstract: The economical perspective of Flexible AC Transmission System (FACTS) installation and performance has been a crucial issue since inception and increasing every day due to strategic, technical and market constraints. The optimization of these issues plays an important role in the success of any utility and ultimately low cost availability of power at the user end. This paper presents the optimal location of Thyristor Controlled Series Capacitor (TCSC) in power system to minimize the transmission loss using Particle Swarm Optimization technique. The simulations are performed on the IEEE-14 bus system, IEEE 30 bus system and Indian 75 bus system with Newton Raphson load flow algorithm including TCSC.

Keywords: FACTS, TCSC, Transmission Loss, PSO.