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2017-06-11 - Colloque/Article dans les actes avec comité de lecture - Anglais - 4 page(s)

Feudjio Letchindjio Christian , Cremer Céline, Deschênes Jean-Sébastien, Vande Wouwer Alain , "Observability issues and unknown inputs in microalgae cultures" in 12th IWA Specialized Conference on Instrumentation, Control & Automation (ICA 2017), pages 81-84, Québec City, Canada, 2017

  • Codes CREF : Sciences de l'ingénieur (DI2000), Biotechnologie (DI3800), Automatisme et régulation (DI2150), Automatique (DI2530), Automatisme industriel et processcontrol (DI2151)
  • Unités de recherche UMONS : Automatique (F107)
  • Instituts UMONS : Institut des Biosciences (Biosciences)
  • Centres UMONS : Biosys (BIOSYS)
Texte intégral :

Abstract(s) :

(Anglais) Microalgae cultures have a wide range of applications ranging from waste water treatment to biofuel production. For advanced control and monitoring purposes, it is required to develop software sensors reconstructing on-line the process state. However, this is a hard problem due to observability conditions and the presence of unknown inputs. In this paper, we provide an observability analysis and show the conditions under which, even if the observability conditions are satisfied, the sensitivity of the unmeasured states to the measured ones is weak and the observer convergence is affected. In addition, we consider the presence of unknown inputs and develop an extended Kalman filter and an unkonwn input observer to deal with this situation. Estimation is also illustrated with experimental data from cultures of Scenedesmus obliquus.