PERFORMANCE ANALYSIS OF AN AUTOMATIC GENERATION CONTROL FOR NONLINEAR MODEL OF INTERCONNECTED ELECTRIC POWER SYSTEM BY USING FRACTIONAL ORDER SLIDING MODE CONTROL

Abstract

Abstract Automatic Generation Control (AGC) has gained its importance due to getting quality of electricity and the structure of the interconnected electric power system to sustain the frequency and tie line powers are within their allowed standard values. This thesis work is applicable to the fractional order sliding mode controller for Automatic Generation Control in a nonlinear model of an interconnected electric power System. A Fractional Order of Sliding Mode Controller is applied to three areas of a nonlinear interconnected electric power system. The nonlinearities that are physical constraints such as governor dead band and generation rate constraints are considered in the block diagram of the power plant model system. The objective of the control is to regulate the frequency deviation (load frequency error) and tie-line power deviation (tie-line power error) of the interconnected power system in the presence of different load changes (sudden load change frequency), parameter uncertainty (variation), and physical constraint exist. The fractional order sliding mode controller (FOSMC) is simulated on the three areas of an interconnected power system with nonlinearities. These designs show the best result of the proposed controller FOSMC with numerical value of frequency deviation -6.8912e-4Hz and tie line power deviation -2.9765e-5p.u. When FOSMC compared with SMC the frequency deviation -2.0762e-3 Hz and tie line power deviation -1.21754e-3 p.u. and also for PID controller frequency deviation -3.5918e-3 Hz and ti line power deviation -1.56025e-3 p.u. have less nominal values of the proposed system. These comparisons also show that FOSMC has the most effective performance, such as less overshoot 1.5545e-4, undershoot -5.4823e-4, rising time 1.00042e-8, and less settling time 2.688 even when their are parameter variation, load change, and nonlinearities system existed. The system model controllers have been designed and simulated on MATLAB/Simulink. Key words: Automatic Generation Control, FOSMC, Fractional Order, Sliding Mode Controller, Tie-Lines