EFFICIENT INCREMENTAL FUZZY-LOGIC CONTROLLER FOR POWER-SYSTEM STABILIZATION

The paper presents atr efficient arid simple fuzzy logic power system stabilizer (FLPSS) for damping electromechanical modes of oscillations and enhancing power system synchronous stability. The essential featu re of the proposed controller is that the pole placement approach is u sed to assign the open-loop poles at certain specified locations at no minal operating point. Then the fuzzy logic controller is employed to excite the synchronous machine excitation system by an incremental sig nal for enhancing the power system stability over a wide range of oper ating condition and exciter gain. The input signals to the FLPSS is th e speed deviation and speed deviation change. The simulation results u sing the proposed controller are carried out on an synchronous machine connected to infinite bus through transmission line. Moreover,a compa rison between the conventional fixed-gain PI controller and the propos ed FLPSS is presented. The results validate the effectiveness of the p roposed FLPSS in terms of less overshoot/undershoot and enhancing the power system stability over a wide range variation of generator loadin g conditions and a variety of exciter gain.