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Peter Hippe

A New Method for the Control of Systems with Input Saturation

In a well damped linear loop input saturation can have a destabilizing effect, which is usually called windup. Nearly all the existing windup prevention measures only become active after the plant input signal has surpassed the saturation limit for the first time. Though this is no problem with stable systems, in case of unstable plants it may entail the danger that closed loop instability cannot be prevented by these measures. This paper presents a novel windup prevention scheme which uses feedforward control for reference tracking and feedback for disturbance rejection. This enables the designer to reserve one part of the limited input signal range for disturbance rejection and the remaining one for reference tracking. Thus, a closed loop design with guaranteed stability becomes possible for exponentially unstable plants with input saturation. Also for stable systems, the new scheme can be used. For an exponentially unstable system the application of the new scheme is demonstrated.

at – Automatisierungstechnik, Oldenbourg Wissenschaftsverlag

Print ISSN: 0178-2312
Volume: 52, 09/2004
Pages: 421 - 431

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