A robust nonlinear observer-based approach for distributed fault detection of input–output interconnected systems

• Christodoulos Keliris ^[1] ; Marios M. Polycarpou ^[1] ; Thomas Parisini ^[2]
  1. [1] University of Cyprus

     University of Cyprus

     Chipre

     
  2. [2] Imperial College London

     Imperial College London

     Reino Unido

     
• Localización: Automatica: A journal of IFAC the International Federation of Automatic Control, ISSN 0005-1098, Vol. 53, 2015, págs. 408-415
• Idioma: inglés
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• Resumen

  • This paper develops a nonlinear observer-based approach for distributed fault detection of a class of interconnected input–output nonlinear systems, which is robust to modeling uncertainty and measurement noise. First, a nonlinear observer design is used to generate the residual signals required for fault detection. Then, a distributed fault detection scheme and the corresponding adaptive thresholds are designed based on the observer characteristics and, at the same time, filtering is used in order to attenuate the effect of measurement noise, which facilitates less conservative thresholds and enhanced robustness. Finally, a fault detectability condition characterizing quantitatively the class of detectable faults is derived