Design of Type-2 Fuzzy PSS combined with Sliding Mode Control for Power System SMIB

A design of the sliding mode controller (SMC) combined with the type-2 fuzzy power system stabilizer is developed in this paper in order to guarantee the power system stability in the different operation conditions. The type-2 fuzzy logic controller is designed to obtain the optimal power system stabilizer (PSS) in the presence of uncertainties. The main advantage of type-2 fuzzy logic over type-1 fuzzy logic is its ability to take linguistic and numerical uncertainties into account. The objective of combining the sliding mode control and the type-2 fuzzy PSS is to handle the fluctuations in the system parameters by adjusting the control parameters which improves the stability and the dynamic response. The results of simulation exhibit the validity of the developed approach with a fault conditions for a Single Machine Infinite Bus (SMIB) power system which the tracking performance is achieved with less oscillations.