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Thomas JARRY’s Thesis Defense

par Laurence Laffont - publié le

Thomas JARRY’s thesis defense, intitled Dimensionnement optimal d’un système hybride direct pile à combustible PEM haute température (PEM-HT) - batterie et impact d’un tel système sur les interactions avec le convertisseur de puissance associé (Optimal Sizing of a High Temperature PEM Fuel Cell (PEM-HT) - Battery Direct Hybrid System and Impact of such a System on the Interactions with the Associated Power Converter), will be held on Wednesday, July, 20th at 10:00 am in salle des thèses (C002) at ENSEEIHT.

This thesis has been deeloped within the scientific group called GENESYS in partnership with Safran Power Units.

Jury :

Mr Daniel HISSEL, Professor, Université de Franche-Comté, FEMTO-ST. Rapporteur.

Mr Walter LHOMME, Lecturer, Université de Lille. Rapporteur.

Mrs Delphine RIU, Professor, Grenoble INP. Reviewer.

Mr. Rochdi TRIGUI, Research director, Université Gustave Eiffel. Reviewer.

Mrs Marion SCOHY, PhD Engineer, Safran Power Units. Guest.

Mr Christophe TURPIN
, Research director, CNRS. Thesis supervisor.

M. Amine JAAFAR, Lecturer, Toulouse INP. Thesis co-supervisor.

M. Fabien LACRESSONNIERE, Lecturer, UPS – IUT de Tarbes. Thesis co-supervisor.

Abstract :

This thesis takes place within the Plasma and Energy Conversion Laboratory (LAPLACE), in the Electrical and System Engineering Group (GENESYS). This research group works on the design of energy systems, and in particular the aspects of sizing, energy management and modeling of coupled heterogeneous systems. The GENESYS group works in particular on fuel cells, by studying the potential of this technology within electricity production systems. The "Fuel Cell For Aeronautical Applications (PIPAA)" project is led by one of LAPLACE’s industrial partners, Safran Power Units, based in Toulouse. This project aims to design an electricity production system using a fuel cell hybridized with electrochemical storage (battery, supercapacitors) for aeronautical applications. In order to simplify the hybrid system, the thesis aims to study the direct hybridization of a fuel cell type PEM-HT (High temperature proton exchange membrane cell) with a battery. This direct hybridization aims on the one hand to protect the fuel cell against the rapid current variations required by the application and on the other hand to protect it against the current harmonics generated intrinsically by the associated power electronics by filtering the ripple high frequency current. A dynamic model of the system was developed, composed of fuel cell and battery models identified from characterizations on typical components. An original characterization of the dynamic model of the fuel cell was carried out using quasi-static stresses carried out at regulated flow rates and at fixed flow rates, and dynamic current sweeps carried out at fixed flow rates. A dimensioning of a direct fuel cell-battery hybrid system is proposed from an ultimately simplified model of the system. This one, validated by comparison with a rather very complete dynamic model, allows the analytical resolution of the system and the comparison of different battery technologies – lithium-ion and NiCd – for such a hybridization. In addition, an endurance test to study the impact of high frequency (HF) current harmonics is currently being carried out on 4 PEM-HT monocells on a test bench developed during this thesis work. The most thorough analysis possible of these tests will be proposed in order to demonstrate the interest of filtering these HF harmonics by direct hybridization.