This paper proposes a new power system stabilization technique based on adaptive fuzzy systems. The adaptive fuzzy power system stabilizer (AFPSS) is a fuzzy logic based stabilizer that has the capability to adaptively change its rule base online. The change in the fuzzy rule base is done using the variable structure direct adaptive control algorithm. This algorithm has two merits: 1) it has a good performance in the training phase as it makes use of the initial rule base defined for the fuzzy logic stabilizer; and 2) it has a robust estimator since it depends on a variable structure technique. The adaptive nature of the new controller significantly reduces the rule base size and improves its performance.
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