Power System Stabilizer Design Using Interval Type-2 Fuzzy Logic Control

摘要

Power System Stabilizers (PSS) are added to excitation systems to enhance the damping of low frequency oscillations in power systems. In this paper interval type-2 fuzzy logic (IT2FL) is used to design power system stabilizers for single machine infinite bus (SMIB) and multi machine power systems. For controller design, membership functions of system variables are represented using interval type-2 fuzzy sets. The interval type-2 fuzzy set is capable of modeling the uncertainty and imprecision in a better way. Performance of the proposed controller in damping the low frequency oscillations is compared with that of the optimal lead lag and optimal type-1 fuzzy logic controllers. Simulation results reveal the superior performance of the proposed controller and also show the robustness of the controller with respect to system parameter variations and disturbances.