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Application of reduced models for robust control and state estimation of a distributed parameter system
LuleƄ University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
2009 (English)In: Journal of Process Control, ISSN 0959-1524, E-ISSN 1873-2771, Vol. 19, no 3, 539-549 p.Article in journal (Refereed) Published
Abstract [en]

This paper studies the application of reduced models of a distributed parameter system for robust process control and state estimation. We take the approach of integrating model reduction, parameter identification, and model uncertainty analysis, in purpose to find an appropriate trade-off between complexity and robust performance. The application example is the temperature system in a continuous paper pulp digester. Physical modeling of this process results in coupled linearized partial differential equations which are then reduced into low-order nominal process models using an orthogonal collocation approximation method.Two different approaches to obtaining a model uncertainty description are adapted for use on a distributed parameter system with low-order nominal model and shown to produce similar results when tested with measurement data. It is also demonstrated how this uncertainty description, in combination with the reduced model, may be used for robust control design and verification of the control performance on the distributed parameter system.Finally, the possibility of estimating the distributed process state using a state observer for the reduced process is demonstrated. Measurements of the process state in a certain position is available and is shown to agree with the estimated state at the same position.

Place, publisher, year, edition, pages
2009. Vol. 19, no 3, 539-549 p.
Research subject
Control Engineering
URN: urn:nbn:se:ltu:diva-12280DOI: 10.1016/j.jprocont.2008.04.009Local ID: b63f6f50-4378-11dd-bfd7-000ea68e967bOAI: diva2:985230
Validerad; 2009; 20080626 (andreasj)Available from: 2016-09-29 Created: 2016-09-29Bibliographically approved

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Ding, LimeiJohansson, AndreasGustafsson, Thomas
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