Fuzzy Logic Based UPFC Controller for Damping Power System Oscillations

In this paper, a fuzzy logic controller is proposed for a Unified Power Flow Controller (UPFC) installed in a single-machine infinite-bus power system. The Fuzzy Logic controller is mainly equipped to damp power system oscillations. Simple Fuzzy Logic controller using mamdani-type inference system is used. The Fuzzy Logic based UPFC controller is designed by selecting appropriate controller parameters based on the knowledge of the power system performance. The effectiveness of the new controller is demonstrated through time-domain simulation studies. By comparison, it can be seen that the proposed UPFC controller can provide good performance for different operating conditions of power system. The results of these studies show that the designed controller is robust enough to damp power system oscillations with change in system operating conditions.