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 feature of the proposed controller is that the pole placement approach is used to assign the open-loop poles at certain specified locations at nominal operating point. Then the fuzzy logic controller is employed to excite the synchronous machine excitation system by an incremental signal for enhancing the power system stability over a wide range of operating condition and exciter gain. The input signals to the FLPSS is the speed deviation and speed deviation change. The simulation results using the proposed controller are carried out on an synchronous machine connected to infinite bus through transmission line. Moreover,a comparison between the conventional fixed-gain PI controller and the proposed FLPSS is presented. The results validate the effectiveness of the proposed FLPSS in terms of less overshoot/undershoot and enhancing the power system stability over a wide range variation of generator loading conditions and a variety of exciter gain.