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An observer for systems with nonlinear output map
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.ORCID iD: 0000-0001-8893-4809
2003 (English)In: Automatica, ISSN 0005-1098, E-ISSN 1873-2836, Vol. 39, no 5, p. 909-918Article in journal (Refereed) Published
Abstract [en]

A nonlinear observer, with the feedback gain weighted by the sensitivity of the output with respect to the state, is developed for systems with nonlinear output map. The observer can be obtained from the extended Kalman filter by a special choice of time-varying weighting matrices. It is shown that the estimation error dynamics are asymptotically stable and a region of attraction is derived. The observer is applied to the top blown converter process for estimating the content of impurities in the liquid metal. Using plant data from the converter at SSAB Oxelösund AB, the observer is shown to provide accurate estimates of the carbon content.

Place, publisher, year, edition, pages
2003. Vol. 39, no 5, p. 909-918
National Category
Control Engineering
Research subject
Control Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-3907DOI: 10.1016/S0005-1098(03)00031-1ISI: 000182302700014Scopus ID: 2-s2.0-0037401486Local ID: 1c22d190-799a-11db-8824-000ea68e967bOAI: oai:DiVA.org:ltu-3907DiVA, id: diva2:976769
Note
Validerad; 2003; 20060922 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Johansson, Andreas

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