Decoupled adaptive interval type 2 fuzzy sliding mode controller for power systems

In this paper, we propose a decoupled adaptive interval type 2 fuzzy sliding mode control scheme that has the ability to enhance the transient stability and achieve voltage regulation of a single machine infinite bus power system. The design of this controller involves the direct feedback linearization (DFL) technique and the sliding mode (SM) control theory. Two fuzzy systems are used as reaching and equivalent parts of the SMC. The fuzzy logic is used to handle uncertainty/ disturbance in the design of the equivalent part and to provide a chattering free control for the design of the reaching part. To construct the equivalent control law, an adaptive interval type2 fuzzy logic inference engine is used to approximate the unknown parts of the system. To get rid of the chattering, a fuzzy logic model is assigned for reaching control law, which is acting like the saturation function technique. The stability of the closed-loop system is proved mathematically based on the Lyapunov method. Simulation results illustrate the performance of the developed approach regardless of the system operating conditions.