Optimal Location of Multi Type FACTS Devices for Single Contingency Using Genetic Algorithm

Abstract

In any power system, unexpected outages of lines or transformers occur due to faults or other disturbances. These events, referred to as contingencies, may cause significant overloading of transmission lines or transformers, which in turn may lead to outages. This paper presents a procedure based on the contingency severity index (CSI) described by a real power flow performance index (PI) to place multi type FACTS devices (Flexible AC Transmission System) in order to eliminate or alleviate the line over loads, resulting in an increased loadability, reduced system loss, improved stability of the network, by controlling the power flow in the network. TCSC (Thyristor Controlled Series Compensator) and SVC (Static Var Compensator) are considered and modeled for steady state analysis. Once the location is determined, their type, their optimal settings and cost of installation can be obtained by solving the optimization problem using genetic algorithms (GA). The proposed approach is tested on 9- bus test system.