H_∞ control of a Wiener-type system

Abstract

A Wiener system is a system which can be modelled as a linear dynamic followed by a static gain. The goal of this paper is to develop a robust H _∞ compensator for controlling an SISO Wiener system. The controller also takes the form of a Wiener model. The design approach consists of the approximation of the non-linear gain using a piecewise linear (PWL) function and in using a linear controller for each sector obtained from this approximation. Therefore, the general controller structure can be stated as a linear dynamic compensator in series with a PWL static gain.

As an illustrative case, a neutralization pH reaction between a strong acid and a strong base in the presence of a buffer agent is dealt with. Computer simulations are developed for showing the performance of the proposed controller.

Acknowledgement

This work was financially supported by the Universidad Nacional del Sur

Notes

§ Also with CIC.

‡ Also with CONICET.

‡ Also with CONICET.

Additional information

Notes on contributors

J. L. Figueroa ‡

§ Also with CIC. ‡ Also with CONICET.