Contribution à l'étude de machines électriques polyphasées à aimants permanents en vue d'une meilleur gestion de la commande en modes dégradés pour des applications liées aux énergies renouvelables marines.

Abstract : The aim of this thesis is to study multiphase permanent magnet electrical synchronous machines (PMSM) and associated control strategies for tidal energy harnessing. These systems must be able to operate in fault mode in a wide range of speed. Indeed, for marine energy extraction applications, it is difficult to access to the site for maintenance operations. Specific control strategies in healthy and faults modes have been proposed, for 5 phases and 2X3 phases PMSM in a wide range of speed including flux weakening operations. A comparative study has also been done by evaluating the torque speed characteristics of several PMSM with fractional slot concentrated winding. This study is based on an analytical model which allows evaluating inductance values and EMF waveforms, from the knowledge of slot/pole combination of the machine windings. This analytical model allows evaluating qualitatively the impact of the control strategies on magnet losses and radial forces. Finally a practical case of tidal current energy extraction has been studied by quantifying extracted energy, in healthy and in faults modes for several multiphase electrical generators associated with a fixed pitch turbine in a typical tidal site.
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Ousmane Fall. Contribution à l'étude de machines électriques polyphasées à aimants permanents en vue d'une meilleur gestion de la commande en modes dégradés pour des applications liées aux énergies renouvelables marines.. Génie des procédés. Ecole nationale supérieure d'arts et métiers - ENSAM, 2017. Français. ⟨NNT : 2017ENAM0002⟩. ⟨tel-01882830⟩

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