An adaptive fuzzy-synchronous machine stabilizer

This paper describes an adaptive fuzzy-synchronous machine power system sta bilizer (PSS) that behaves like a proportional integral derivative (PTD) co ntroller. The implemented adaptive technique predicts tracking-error diverg ence and makes on-line adjustments to the controller-gain parameters in ord er to obtain a faster regulation of the error signal. The proposed PSS is l ess sensitive to the quality of expert know-ledge, and thus is more robust than a nonadaptive fuzzy PSS when subjected to large disturbances. Hence, a dequate controls are derived for the various error cases, and smooth contro l surfaces are achieved. Simulations are carried out using the proposed PSS to show that it consistently gives a stable response with acceptable overs hoots and settling times on the frequency, angle, and voltage errors.