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Contribution au renvoi de tension et à la reconstitution du réseau. Identification des paramètres d'un réseau. Estimation des flux rémanents dans un transformateur

Abstract : During the re-energization of the auxiliaries of a nuclear power plant, the more dangerous step is the re-energization of the power transformer, because of the temporary overvoltages. In order to improve the transient modeling, models and techniques may be improved. The purpose of this thesis is to suggest new methodologies to identify the uncertain parameters of the model. When the line re-energization occurs, an identification methodology (optimization or methods using signal processing) allows determining the model variable parameters. However, one of the most important parameters in the overvoltages is the residual flux. Given the actual problems found on estimation strategies (no direct method, derivation,…), a new method established for the leakage flux measurement of the magnetic circuit is proposed. Real measurements using « fluxgate » technology sensors were realized, permitting to estimate the residual flux.
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Didier Cavallera. Contribution au renvoi de tension et à la reconstitution du réseau. Identification des paramètres d'un réseau. Estimation des flux rémanents dans un transformateur. Autre. Université de Grenoble, 2011. Français. ⟨NNT : 2011GRENT121⟩. ⟨tel-00732191v2⟩

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