Modélisation et commande d'un réseau électrique continu

Abstract : This work investigates control approaches for the stabilization of DC electrical networks. Interactions between different elements of a network i.e, sources, filters and loads may lead to instability. These interactions may be identified by studying a network containing constant power loads (CPLs). To address the problems caused by the interconnection of these elements, different control methods could be evaluated to ensure the stability and maintain network performances throughout its operating range. The first approach uses « backstepping »method, which requires cascade structure models. However, according to available control input, this approach may be difficult to implement when multiple power loads are present. The second approach is based on passivity theory using « damping injection » control. This control law adds a virtual damper to the input filter loads in order to compensate the negative impedance effect introduced by the CPL. Finally, in order to provide an integrated solution for the problem of network stabilization, an approach based on multiple model representation of the system was investigated. This method also allows to consider the design of an observer when the entire state vector is not measured. To validate and compare the performance of different control methods, a DC electrical network characterized by two loads of different natures and a reversible storage device was defined. The storage device is the only control input considered for the stabilization.
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Djawad Hamache. Modélisation et commande d'un réseau électrique continu. Automatique / Robotique. Centrale Supélec, 2016. Français. ⟨tel-01812733⟩

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