Comparison of Facts Devices to Reduce Power System Losses and Improvement in Voltage Stability by Using Optimization Technique

The research work described in this paper concentrates on the application of Flexible Alternative Current Transmission System (FACTS) controllers as a solution to the power system problems like voltage stability and losses. Electrical power generation in our country has been a bigger challenge to meet the growing demands for more power. Because of this, the power trading and grid maintenance becomes complex issues, and power system is becoming less secure. In power system, voltage instability is one of the most important problem. The problem voltage stability play a major role in fast development of restructuring in deregulated power system. Placing of FACTS devices in a suitable location is important to improves the voltage stability and reduce power system losses. This paper proposes a Bacterial Foraging Optimization (BFO) technique to determine optimal location for FACTS devices like Thyristor Controlled Series Capacitor (TCSC) & Unified-Power-Flow Controller (UPFC) to reduce power system losses and improve voltage stability. Among these two FACTS devices UPFC is better to reduce power system losses and improve voltage stability than TCSC. The method has been successfully demonstrated on IEEE30-bus system.