An extended horizon feedback/feedforward self-tuning controller
Article first published online: 17 JUN 2004
Copyright © 1989 American Institute of Chemical Engineers
Volume 35, Issue 11, pages 1835–1844, November 1989
How to Cite
Kershenbaum, L. S. and Pérez-Correa, J. R. (1989), An extended horizon feedback/feedforward self-tuning controller. AIChE J., 35: 1835–1844. doi: 10.1002/aic.690351110
- Issue published online: 17 JUN 2004
- Article first published online: 17 JUN 2004
- Manuscript Revised: 31 AUG 1989
- Manuscript Received: 27 MAR 1989
A feedforward/feedback version of a single input/single output self-tuning controller has been developed and tested both via simulation studies and experiments on a section of an absorption/desorption pilot plant. The algorithm is based on the recursive least squares estimation of parameters for the linear models relating the output to the controlled input and to the disturbances; adaptation is achieved using a variable forgetting factor. The control input at each time interval is calculated using one of several single-step extended-horizon control strategies.
The results show that the performance of the algorithm is insensitive to the choice of initial parameters, all of which have a readily identifiable intuitive basis. The algorithm is especially robust against deterministic disturbances (measurable and unmeasurable) and unknown and varying time delays. Computational load beyond that of a feedback-only version is minimal.