Design of multi-objective UPFC employing backtracking search algorithm for enhancement of power system stability

In the arena of power system, small signal stability is one of the most important issue to be settled down. In relatively weak tie line interconnections, these low frequency oscillations are observed. Use of Flexible AC Transmission System (FACTS) devices is playing most important roles in damping out of those oscillations. Unified Power Flow Controller (UPFC), one of the key members of FACTS family is being used in long and high voltage transmission networks of modern power system. Tuning of the UPFC parameters in real time power system application is a multi-objective optimization problem. In this paper the parameters of UPFC has been optimized employing a novel optimization approach, Backtracking Search Algorithm (BSA). The efficacy of the proposed BSA tuned UPFC has been investigated by comparing the time domain simulation results with fixed gain conventional UPFC. Additionally, the Eigenvalues of optimized and conventional UPFC of the power system has also been compared.