Browsing by Author "Llanos, Jacqueline"

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    A Novel Distributed Control Strategy for Optimal Dispatch of Isolated Microgrids Considering Congestion
    (2019) Llanos, Jacqueline; Olivares Quero, Daniel; Simpson Porco, John W.; Kazerani, Mehrdad; Sáez Hueichapan, Doris Andrea
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    Distributed Predictive Control Strategy for Frequency Restoration of Microgrids Considering Optimal Dispatch
    (2021) Navas F., Alex; Gómez, Juan S.; Llanos, Jacqueline; Rute, Erwin; Sáez, Doris; Sumner, Mark
    Microgrids are the cornerstone for a new model of electrical generation based on renewable resources. Commonly microgrids are controlled with a centralised hierarchical structure, which is inherited from power systems. However, a time-scale separation between traditional fast frequency restoration and slow economic dispatch may be counterproductive in the long run because the slow long-term economic dispatch increases the prediction uncertainty. In an effort to improve the economical operation of microgrids, this work proposes a distributed model predictive control strategy for the operation of isolated microgrids based on a consensus strategy that tackles both the economic dispatch and frequency restoration over the same time-scale. The proposed controller can operate without knowledge of the microgrid’s topology: instead, typical local measurements and other information from neighbouring generation units are required. Experimental results demonstrate that the controller is robust to load variations and communication issues, but the plug-and-play nature of the system is preserved.
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    Economic Dispatch by Secondary Distributed Control in Microgrids
    (IEEE, 2019) Llanos, Jacqueline; Gomez, J; Sáez Hueichapan, Doris Andrea; Olivares Quero, Daniel; Simpson Porco, John W.
    This paper proposes a distributed controller in order to achieve the economic dispatch (ED) of a microgrid, which complies with the Karush-Kuhn-Tucker optimality conditions for a linear optimal power flow formulation. The consensus over the Lagrange multipliers allows an optimal dispatch without considering an electrical microgrid model, preserving the frequency and voltage restoration into the secondary control level for isolated microgrids.