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Design of a Nonlinear Anti-Windup Gain by Using a Composite Quadratic Lyapunov Function

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2 Author(s)
Liang Lu ; Shanghai Jiao Tong Univ., Shanghai, China ; Zongli Lin

This technical note revisits the problem of designing a static anti-windup gain for enlarging the domain of attraction of the resulting closed-loop system. By utilizing a composite quadratic Lyapunov function, which was originally proposed to study the stabilization problem for linear systems under actuator saturation, an existing LMI based design algorithm is enhanced to result in a nonlinear, possibly continuous, anti-windup gain. This nonlinear anti-windup gain enables us to obtain an estimate of the domain of attraction in the form of the convex hull of a group of ellipsoids, instead of a single ellipsoid that would result from a single Lyapunov function based design. Simulation results demonstrate the features of the proposed design the composite quadratic Lyapunov function brings about.

Published in:

Automatic Control, IEEE Transactions on  (Volume:56 ,  Issue: 12 )

Date of Publication:

Dec. 2011

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