Behrooz Rezaei - Elec. & Comp. Dept., Faculty of Engineering, Tehran University North Kargar St., Tehran, IRAN
Hamid Lesani - Elec. & Comp. Dept., Faculty of Engineering, Tehran University North Kargar St., Tehran, IRAN

A fuzzy sliding-mode control system that combines the merits of sliding-mode control and the fuzzy inference mechanism is proposed. First a sliding-mode controller with an integral operating switching surface is designed. Then a fuzzy sliding-mode controller is investigated in which a simple fuzzy inference mechanism is used to estimate the upper bound of uncertainties, then chattering is reduced. A detailed sensitivity analysis for a one- machine-infinite-bus system reveals that the fuzzy sliding-mode power system stabilizer is quite robust to wide variations in operating load and system parameters.

Power system stabilizer, Fuzzy sliding-mode control