Voltage regulation using hybrid pi-fuzzy logic controller based static var compensator for maintaining power quality

This paper presents Hybrid PI-Fuzzy Logic controller for controlling the susceptance of Static Var Compensator in purpose of voltage regulation. The appropriate value of this susceptance could be provided by triggering the SVC with the fitted firing angle of thyristor which controlled by Hybrid PI-Fuzzy Logic Controller algorithm. The Hybrid PI-Fuzzy Logic Controller comprises of simple PI controller and Fuzzy Logic Controller connected in series. The results are verified by comparing with another control algorithm, conventional PI controller. The simulation results show that the proposed algorithm could obtain a satisfactory performance. The proposed algorithm has the average settling time, ts_avg, 0.0442 second and 0.1146 second. While the conventional PI controller has the average settling time, ts_avg, 0.1009 second and 0.1702 second. Hence, this algorithm is capable of regulating the voltage in point of common coupling, thus the power quality could be maintained.