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Étude, modélisation et mise en oeuvre de convertisseurs DC-DC isolés multiport et modulaires

Abstract : This thesis deals with architecture and control of hybrid electrical energy sources where the main source is a fuel cell and the auxiliary one, supercapacitors. Among the various possible power electronics architectures, an isolated multi-port converter using a multi winding transformer has been realized. Each element of the device (fuel cell, supercapacitors and load) is connected to one winding by a voltage inverter. The control of energy exchanges is performed by controlling the phase shifts between voltage waveforms delivered by inverters. The use of identical converters and control modes ensures the modular nature of the system. Transformer modeling is performed in general manner for a N-port transformer and the development of a polygon model simplifies the calculation of the energy exchanges between ports. Two control methods are presented. The first method, more conventional, uses a linear regulator to control the power delivered by the fuel cell and the output voltage is controlled via the electrostatic energy stored in the output capacitor. The limitation of the current variation delivered by the fuel cell is performed by limiting the variation of the input power. The second method is based on the concept of flatness. Energies stored in the capacitors are the flat output variables whereas the powers exchanged between the main source and the other ports are the control variables. It was then possible to determine the trajectory of the flat outputs to meet various constraints like the limitation of the current variation delivered by the fuel cell, the fuel cell maximum power, and the current of the output capacitor during startup. Both control methods have been validated in normal, overload and recovery modes by numerical simulation and experimental results. Rather than using a 4-port converter requiring control of six energy exchanges between ports, the paralleling of two 3-port converters connected to the same main source and load using simulation is studied. The presence of these two converters allows optimizing the system efficiency according to the considered operating point
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Matheepot Phattanasak. Étude, modélisation et mise en oeuvre de convertisseurs DC-DC isolés multiport et modulaires. Autre. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0193⟩. ⟨tel-01749387⟩



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