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Étude et conception de convertisseurs réversibles multi sources isolés pour l’interfaçage au réseau de sources d'énergies renouvelables et de moyens de stockage

Abstract : International agreements for the reduction of polluting emissions to the environment require the use of renewable energies in the electricity grid. In addition, the integration of storage devices is envisaged in the future electrical networks in order to solve the intermittence problems and to optimize the consumption of the users. However, due to the different characteristics of the electrical signals involved (DC current for renewable sources and batteries, AC current for the electrical network), the current structures consist on several cascaded converters. This results in a low energy density, higher costs and reduced efficiency for the system. In addition, the different voltage levels (battery voltages, renewable sources and power grid) and safety constraints often require the use of transformers to provide galvanic isolation and match the voltages.This thesis focuses on the design of an innovative three-port structure for the bidirectional power flows control between a renewable power source, a battery pack and the power grid (single phase or three-phase) with a single conversion stage. The TAB (Triple Active Bridge) structure has been chosen for this purpose, due to its many advantages such as galvanic isolation, soft switching (ZVS) in all of its active bridges (allowing to work at high switching frequency) and the possibility of an easy power flow control between the different sources. In this way, the analysis has established a methodology for the design of a TAB DC / DC structure, a single-phase TAB DC / AC structure, a single-phase TAB DC / AC structure with a series connected active filter in order to achieve a "single phase power decoupling" and finally, for the design of a three-phase TAB DC / AC structure.
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Damian Sal y Rosas Celi. Étude et conception de convertisseurs réversibles multi sources isolés pour l’interfaçage au réseau de sources d'énergies renouvelables et de moyens de stockage. Energie électrique. Université Grenoble Alpes, 2017. Français. ⟨NNT : 2017GREAT024⟩. ⟨tel-01689973⟩

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