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Diagnostic et observation d'une classe de systèmes dynamiques hybrides. Application au convertisseur multicellulaire série

Abstract : This thesis deals with the diagnosis and the observation of a large class of switched linear systems with an application to the multicellular converter. The objective is to provide solutions for non-observable subsystems in the classical sense which can be influenced by continuous or discrete faults. After presenting a state of the art for the observation and diagnostic techniques for switched systems, the report is divided into two parts. The first part provides, in one hand, a strategy for the discrete and continuous states estimation for linear switched system with unknown input. A hybridobserver based on higher order sliding mode is developed. On the other hand, two diagnostic procedures are presented. The first one combines a hybrid observer and a discrete diagnoser to detect a continuous fault. In the second one, an active diagnosis is defined based on the testing theory to detect and isolate a discrete fault. In the second part of this thesis, the different steps to create a multicellular converter are detailed. Then, a chapter is dedicated to the validation of the theoretical approaches for the observation and diagnosis of the three cells converter. An observer is designed to estimate the capacitor voltages. The two proposed diagnosis procedures are applied to detect a change in the capacitance values and to diagnose locked cells. Finally, a binary control for the converter is proposed. The implementation of this strategy will allow, in the future, the fault tolerant control of the converter.
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https://tel.archives-ouvertes.fr/tel-00933659
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Submitted on : Monday, January 20, 2014 - 6:22:10 PM
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Jérémy van Gorp. Diagnostic et observation d'une classe de systèmes dynamiques hybrides. Application au convertisseur multicellulaire série. Autre. Université de Valenciennes et du Hainaut-Cambresis, 2013. Français. ⟨NNT : 2013VALE0033⟩. ⟨tel-00933659⟩

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