Enhancement of voltage stability with UPFC using a novel hybrid algorithm (GA-GSA)

The voltage collapse problem can avoid by providing proper reactive power resources to maintain specified voltage profile in the network. The traditional approaches are not sufficient to mitigate reactive power imbalance in the modern power system. Hence one of the emerging technologies like integration of Flexible AC Transmission System (FACTS) devices has been adopted in this paper. A hybrid algorithm is proposed to improve voltage stability of power system and to optimize the FACTS controllers. This Hybrid algorithm intended by the combination of genetic algorithm (GA) and gravitational search algorithm (GSA). For the implementation of this technique, one of the FACTS devices namely Unified power flow controller (UPFC) is selected. The GA is applied to identify best locations of UPFC and later GSA is implemented to optimize UPFC ratings in a sequential manner. The proposed method is implemented on IEEE-30 bus system using MATLAB working platform. The results have shown the effectiveness of proposed algorithm for practical applications.