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Technical Briefs

An Internal Model Control Anti-Windup Scheme With Improved Performance for Input Saturation Via Loop Shaping

[+] Author and Article Information
Wei Wu

 Lexmark International Inc., Lexington, KY 40550wu_esi@yahoo.com

Suhada Jayasuriya

Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123

J. Dyn. Sys., Meas., Control 132(1), 014504 (Dec 18, 2009) (6 pages) doi:10.1115/1.4000664 History: Received January 08, 2009; Revised October 07, 2009; Published December 18, 2009; Online December 18, 2009

Proposed here is a new approach for synthesizing an internal model control (IMC) anti-windup (AW) compensator for a stable plant subject to input saturation. Built on the conventional IMC AW scheme, which preserves the stability robustness of the unconstrained system, the proposed linear AW compensator improves the performance of the constrained system. The analysis conducted through the loop decomposition of the AW system clearly reveals the impacts of the AW compensator on the closed-loop stability and performance. Loop shaping techniques are executed to design the AW compensator. The effectiveness of this approach is demonstrated using a numerical example.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

IMC AW structure

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Figure 2

Configuration for the new IMC based AW scheme

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Figure 3

Equivalent representation of the AW system

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Figure 4

Configuration for open-loop shaping

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Figure 5

Configuration for closed-loop shaping

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Figure 6

Time responses of the linear (dashed) and constrained (dotted) systems with the true plant to a double pulse reference (solid curve in the upper plot)

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Figure 7

Time responses of the linear system (solid) with the true plant and the constrained system with the true plant with IMC anti-windup (dashed) to a double pulse reference

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Figure 8

Time responses of the constrained system with the true plant with the proposed anti-windup scheme using the compensators N1 (solid) and N2 (dotted), and the compensator used in Ref. 12 (dashed), respectively

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