Adaptive Type-2 Fuzzy Controller for Load Frequency Control of an Interconnected Hydro Thermal System Including SMES Units

Abstract

This present paper includes the study Load Frequency Control (LFC) of power systems with several nonlinearities like Generation Rate Constraint(GRC) and Boiler Dynamics (BD) including SuperconductingMagnetic Energy Storage (SMES) units using Type-2 Fuzzy System (T2FS) controllers . Here, Load frequency control problem is dealt with a three -area interconnected system of Thermal-Thermal-Hydal power system by observing the effects and variations of dynamic responses employing conventional controller, Type-1 fuzzy controller and T2FS controller considering incremental increase of step pertubations by 10% in the load. The salient advantage of this controller is its high insensitivity to large load changes and plant parameter variations even in the presence of non-linearities. As the non-linearities were considered in the system, the conventional and classical Fuzzy controllers does not provide adequate control performance with the consideration of above nonlinearities. To overcome this drawback T2FS Controller has been employed in the system. Therefore, the efficacy of the proposed T2FS controller is found to be better than that of conventional controller and Type-1 Fuzzy controller in cosidreration with overshoot, settling time and robustness.