Authors : S.A. Taher and R. Hematti
Abstract: This study presents a study of the application of a Unified Power Flow Controller (UPFC) to enhance the damping of Low Frequency Oscillation (LFO) in Single-machine Infinite-bus (SMIB) power system. In practice systems use simple traditional UPFC supplementary damping controller (like lead-lag) for LFO damping. However, since the traditional supplementary damping controller parameters are usually tuned based on classical or trial-and-error approaches, they are incapable of obtaining good dynamic performance for various load conditions and disturbances in power system. For this problem, in this study, a UPFC supplementary damping controller design using a Genetic Algorithms (GA) schemes is considered to enhance damping and performance. In this approach the parameters of damping controller are tuned based on GA method. Because GA is an optimization method, therefore, obtained damping controller is an optimal controller. The advantages of the proposed method are their feasibility and simplicity. To show effectiveness of GA approach in damping power system oscillation, the proposed method is compared with a conventional method (lead-lag compensator). Several non-linear time-domain simulation tests visibly show the validity of proposed method in compare to traditional method.
S.A. Taher and R. Hematti , 2008. Optimal Supplementary Controller Design Using GA for UPFC in Order to LFO Damping. International Journal of Soft Computing, 3: 382-389.