Modélisation par impédance d'une pile à combustible PEM pour utilisation en électronique de puissance

Abstract : This thesis deals with dynamic modelling of a proton exchange membrane fuel cell (PEMFC) with a view to integrate it into power electronics environment. Firstly a static model based on an expression that links current and voltage is presented. The dynamic model is then obtained. It is shown that the electrochemical diffusion-convection impedance (Zd) is similar to a RC transmission line. A discretization on a short number of elements is carried out. In order to obtain a simple model, two different RC branches for Zd impedance, a double layer capacitor, a transfer resistance, and a membrane resistance are considered. This modelling is validated on two 500 W and 5 kW PEMFC, for frequencies varying from 5 mHz to 2 kHz. The model is validated for both fuel cells during current step responses and operation with a boost converter. In this case it is shown how the high frequency switching of the converter can be used to obtain a diagnostic on the humidification state of the membrane
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Idris Sadli. Modélisation par impédance d'une pile à combustible PEM pour utilisation en électronique de puissance. Autre [cond-mat.other]. Institut National Polytechnique de Lorraine, 2006. Français. ⟨NNT : 2006INPL091N⟩. ⟨tel-01752782⟩

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