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A Reference Governor for Overshoot Mitigation of Tracking Control Systems

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Document pages: 10 pages

Abstract: This paper presents a novel reference governor scheme for overshootmitigation in tracking control systems. Our proposed scheme, referred to as theReference Governor with Dynamic Constraint (RG-DC), recasts the overshootmitigation problem as a constraint management problem. The outcome of thisreformulation is a dynamic Maximal Admissible Set (MAS), which varies inreal-time as a function of the reference signal and the tracking output. TheRG-DC employs the dynamic MAS to modify the reference signal to mitigate or, ifpossible, prevent overshoot. We present several properties of the dynamic MASand the algorithms required to compute it. We also investigate the stabilityand recursive feasibility of the RG-DC, and present an interesting property ofRG-DC regarding its effect on the governed system s frequency response.Simulation results demonstrate the efficacy of the approach, and also highlightits limitations. This paper serves as an extension of our earlier paper on thistopic.

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