This article explores the use of nonlinear output feedback control schemes as power system stabilizers (PSS). We apply five different control schemes to a single generator-infinite bus power system in order to compare their behavior. Specifically, we are interested in the controllers' ability to handle disturbances (model inaccuracies, measurement noise, etc). The control methods used are fuzzy control, sliding mode control, two Lyapunov-based robust control methods and a standard linear PSS. It is found that the linear robust and fuzzy controllers had the best overall behavior.
This paper develops a design method for satisfying tJhe reaching condition when applying variable structure control to a nonlinear system with output feedback. The coiltrol gains are designed so that the sliding surface exists and is globally reachable under the assumption that the syst,em is passive. The case of nonpassive systems is also addressed.
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