Contribution à l'étude de la stabilité et stabilisation des réseaux électriques industriels

Abstract : Industrial power grids are micro-grids connected to the distribution grid via transformers. Recently in these micro-grids, there is a growth in the use of power electronic devices for switch mode power supplies, variable speed drives, UPS, critical loads and energy compensators. Nevertheless, if certain precautions are not taken, these devices may significantly affect the system stability especially in islanded operating mode where the available power is limited. In this work, main causes of instability in micro-grids are studied and solutions to improve the stability margins are proposed. First, small-signal stability analysis tools are applied to identify most sensitive components of the system. Then, large-signal tools are used to estimate the domain of attraction of the stable operating point leading to quantify allowable disturbances. Afterward, a dedicated stabilizer similar to FACTS and another stabilizer taking action directly on loads are proposed. Several stabilization laws are studied, based on either small-signal design tools, or on large-signal tools. Finally, the optimal placement of distributed stabilizers in a micro-grid was studied. A final point concerns the choice of centralized or decentralized computers for stabilization.
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Diane Leblanc. Contribution à l'étude de la stabilité et stabilisation des réseaux électriques industriels. Autre. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0368⟩. ⟨tel-01752019⟩

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