TRANSIENT STABILITY CONTROL IN TRANSMISSION LINE WITH UPFC

Abstract

A versatile model of a unified power flow controller (UPFC) in a single machine six bus system is proposed. Increase in load demand on power system is a threat to transient stability limit so we need some methods to improve the transient stability limit. Control by changing the network parameters is an effective method of improving transient stability. The solution is the use of FACTS (Flexible AC Transmission Systems) devices especially the use of UPFC. (Unified Power Flow Controller) and draw model with the help of modeling of a power system in MATLAB, The model consists of a simple voltage source whose magnitude and angle depends on the UPFC control parameter. These simulation models have been incorporated into MATLAB based Power System Toolbox (PST) for their transient stability analysis. In this paper the study of UPFC with its various modes of operation. Finally by help of modeling of a power system in MATLAB, and by installing UPFC in transmission link, its use as power flow controller and voltage injection. Conclusion is made on different results to see the benefit of UPFC in power system.