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DC MicroGrids Control for renewable energy integration

Abstract : Power grids will be submitted to further constraints in the coming years due to climbing consumption and development of decentralized and intermittent electricity production from renewable sources. However, the efforts are needed to improve the quality of grid and satisfy the grid code as stability, and also to reach the climate requirements set by France and Europe. This study is a contribution to the integration of photovoltaic generation (PV) in the power grid. This energy called renewable has immense potential. However, its intermittent effect remains a real disability restricting development on a large scale. o answer the new constraints of connection to the network (Grid-Codes), we The large penetration intermittent energy sources, presents a new challenges to power systems' stability and reliability; we consider in this work their connection through a Direct Current (DC) MicroGrid and a hybrid storage system, in order to satisfy constraints of connection to the network (the so-called Grid-Codes). The main objective here is to design a system that can fulfil these requirements and allow us to attain a Plug and Play behaviour; this approach is based on the “System of Systems philosophy'' using distributed control methodologies. This thesis constitutes a contribution for DC MicroGrid control and introduces a rigorous dynamics' analysis.. The stabilization of the system is based on storage devices: batteries for energy balance and long term response of power flow, while supercapacitors deal with power balance and fast response. First it will be presented the analysis of the DC MicroGrid which control is designed based on detailed models of energy sources and storage systems. This grid may present an unstable behaviour created by the source's intermittent output power, switching ripples from the power converters and their power electronic and oscillatory currents produced by some types of loads. Therefore the system is subject to both fast and slow variations. The stabilization of such systems will be based on the operation of different technologies of storage, such as battery and supercapacitor, in different time scales. We propose a hierarchical control scheme, based on nonlinear control theory, in particular Lyapunov, backstepping and input/output feedback linearization. The proposed DC MicroGrid and its control are then verified both by computer simulations and by experiments. The results show the good performance of the system under variations on production and on consumption
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Sabah Benamane Siad. DC MicroGrids Control for renewable energy integration. Automatic. Université Paris-Saclay; Université d'Evry, 2019. English. ⟨NNT : 2019SACLE006⟩. ⟨tel-02173724⟩

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