Doctorat

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Start date: 2024Subject: search.filters.subject.Microgrid

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    Smart-grid supply continuity control
    (Université M'Hamed Bougara Boumerdès : Faculté de Technologie, 2025) Kaddour, Djillali; Belaidi, Hadjira(Directeur de thèse)
    This thesis investigates supply continuity in smart grids, emphasizing system reliability under both gridconnected and islanded conditions. It begins with a structured review of how integrating Distributed Energy Resources (DERs) and Energy Storage Systems (ESS) affects supply reliability, assessed using standard indices: System Average Interruption Duration Index (SAIDI), System Average Interruption Frequency Index (SAIFI), and Customer Average Interruption Duration Index (CAIDI). Building on this review, the thesis proposes an intelligent Energy Management System (EMS) paired with a Diesel Generator–Photovoltaic (DG–PV) synchronization strategy. This system ensures continuous operation in islanded mode, overcoming the limitations of traditional grid-tied setups. The EMS, implemented in MATLAB Simulink, applies advanced methods such as peak shaving and optimized resource sizing, using estimated load data from the Institute of Electrical and Electronic Engineering (IGEE) to manage energy flow and peak demand effectively. Comparative insights from the case study demonstrate that although grid-connected systems enable bidirectional power flow and benefit from net metering, they remain vulnerable to grid disturbances. In contrast, islanded mode offers full control and supervision over local resources and improves overall system reliability. To support the preference for islanded operation, the thesis also presents a proof-ofconcept implementation of an AC stand-alone photovoltaic (PV) system, managed by a Multi-Agent System (MAS) integrated with Internet of Things (IoT) technologies. This system employs prioritybased load control and peak shaving to maintain energy stability under varying conditions
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    Coordination of protection systems applied to the electrical network using modern techniques
    (Universite M'Hamed Bougara Boumerdès : Institut de Génie Eléctrique et Eléctronique, 2024) Merabet, Oussama; Bouchahdane, Mohamed(Directeur de thèse)
    The improvement of technology in the previous several decades has enabled a significant presence of renewable power sources in the distribution network (DN). The integrating of such resources has a significant influence on DN by reducing power loss and enhancing network dependability. Aside from that, the current protection system has met coordination issues as a result of bidirectional power flow, varied types and capacities of generating sources, and variations in fault levels as a result of network operating modes (grid-connected or islanded). Moreover, there is a lack of expertise in the creation of adaptive microgrid protection schemes for relay coordination that takes into account all N-1 scenarios through the nonstandard relay characteristics. Therefore, an effective and optimum coordination strategies are required to deal with relays coordination problem. The coordination problem of the directional overcurrent relays (DOCRs) is a restricted and nonlinear optimization issue that involves determining appropriate settings to reduce relays operating time while maintaining the sensitivity and the selectivity characteristics. The protection coordination scheme takes into account relay curve settings (A and B), time dial setting (TDS) and plug setting (PS) to achieve the shortest running time and attain optimal settings. Currently, a various nontraditional optimization strategies have been presented to overcome this challenge. In this work, the coordination optimization problem (COP) of directional overcurrent relays is tackled. The optimization is carried out using a modified versions of an optimization algorithms. The performance of the proposed method is assessed using an IEEE standard test power systems and a distribution system while considering all the N1 contingencies. The results are compared to the traditional approaches as well as those obtained by other current optimization methods provided in the literature in order to demonstrate the effectiveness and superiority of the proposed modified techniques in lowering relay operation time for optimum DOCRs coordination