Comparison of Facts Devices to Relieve Congestion in Deregulated Power Sector by Using Fuzzy 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 problem of congestion management. The congestion occurs when the generation and consumption of electric power causes the transmission system to operate beyond transfer limits. A line utilization factor (LUF) is used to determine the level of congestion in a transmission line. This paper proposes a fuzzy technique to determine optimal location for FACTS devices like Thyristor Controlled Series Capacitor (TCSC)& Unified-Power-Flow Controller (UPFC) to relieve congestion in transmission system. Among these two FACTS devices UPFC is better to relieve congestion than TCSC. The method has been successfully demonstrated on IEEE 14-bus system.