Excitation control of a power plant alternator using interval type-2 fuzzy logic controller

Abstract

This paper presents a practical design of an intelligent type of controller using Interval Type-2 Fuzzy Logic Controller (IT2FLC) concepts for excitation control of a practical power generating system. This type of controller is suitable for real time operation and aims to improve the dynamic characteristics of the generating unit by acting properly on its original excitation system. The modeling of the power system under study consists of a synchronous generator connected via a transformer and a transmission line to an infinite bus. Next, digital simulations of the above system are performed using fuzzy control techniques that are based on previous work. The dynamic performances of the interval type-2 fuzzy logic controllers (IT2FLC) along with Interval type-1 Fuzzy logic controller in short FLC is presented by comparison using the integral square error criterion (ISE). Typical transient responses of the system are shown for comparison in order to demonstrate the effectiveness of the proposed controller. The computer simulation results obtained demonstrate clearly that the performance of the developed controller offers competitive damping effects on the generator oscillations, with respect to the associated ones of the FLC, over a wider range of operating conditions, while their hardware implementation is easier and the computational time needed for real-time applications is drastically reduced. In MATLAB/SIMULINK is simulated model of the synchronous generator connected to an AC system. A simple fuzzy logic control scheme is simulated for voltage control and generator stabilization.