Hybrid extended Luenberger-asymptotic observer for bioprocess state estimation

State observers generate estimates of non-measured variables based on a mathematical model of the process and some available hardware sensor signals. On the one hand, exponential observers, such as Luenberger observers or Kalman filters, have an adjustable rate of convergence, but strongly rely on t...

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Bibliographic Details
Published in:Chemical engineering science 2006-11, Vol.61 (21), p.7151-7160
Main Authors: Hulhoven, X., Wouwer, A. Vande, Bogaerts, Ph
Format: Article
Language:English
Subjects:
Applied sciences
Asymptotic observer
Biotechnology
Chemical engineering
Exact sciences and technology
Luenberger observer
State estimation
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Summary:State observers generate estimates of non-measured variables based on a mathematical model of the process and some available hardware sensor signals. On the one hand, exponential observers, such as Luenberger observers or Kalman filters, have an adjustable rate of convergence, but strongly rely on the accuracy of the process model. On the other hand, asymptotic observers use a state transformation in order to avoid using the (usually uncertain) kinetic model, but have a rate of convergence imposed by the process dilution rate. In an attempt to combine the advantages of both techniques, a hybrid observer is developed, which evaluates a level of confidence in the process model and, accordingly, evolves between the two above-mentioned limit cases (exponential or asymptotic observer). In particular, attention is focused on a hybrid “Luenberger-asymptotic” observer, for which a rigorous stability/convergence analysis is provided. The efficiency and usefulness of the proposed observer is demonstrated with a bioprocess application example.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2006.06.018