Abstract
In this article, a control problem for nonlinear single-input/single-output (SISO) systems with time-varying parameters is discussed. The control system consists of two parts. One part is a fuzzy control loop, which has feedback function designed to overcome random instant disturbances. The other part is a Fourier series-based control, which is a feedforward loop designed to overcome steady lasting deterministic types of uncertain disturbances. The former is a fast loop, in which feedback control rules are autotuned in each sample time. The latter is a slow loop, in which the feedforward control actions are computed at each pass. Stability of the nonlinear control system is guaranteed by means of Lyapunov stability. This approach has been applied to a simulation study of a control system of a superheated steam temperature process in a thermal power plant. The results of comparisons with PID and a fuzzy control show satisfactory performance.
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