Anticipatory anti-windup: An alternative construction

Turner, Matthew C., Sofrony, Jorge and Herrmann, Guido (2014) Anticipatory anti-windup: An alternative construction. In 2014 American Control Conference, ACC 2014. IEEE. pp. 2966-2971 . (doi:10.1109/ACC.2014.6859031).

Record type: Conference or Workshop Item (Paper)

Abstract

Anticipatory anti-windup compensation involves activation of the anti-windup compensator before the physical saturation limits on the control signals are reached; the anti-windup compensator is activated in anticipation of actuator saturation occurring. Existing studies, which have used a pseudo-LPV representation for compensator synthesis, have proposed convex but somewhat complicated and opaque synthesis routines. This paper offers an alternative method of synthesising anticipatory anti-windup compensators, involving the exploitation of a 'non-square' sector condition associated with a combination of deadzone nonlinearities. This method leads to an anticipatory compensator synthesis routine which is close to that associated with standard immediately activated anti-windup compensators. A numerical example and comments on the use of anticipatory anti-windup are also given.

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