Implementation of Directional Over-current Relay Coordination Approaches in Electrical Networks |
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Authors: | Meng Yen Shih Arturo Conde |
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Affiliation: | Universidad Autónoma de Nuevo León (UANL), Facultad de Ingeniería Mecánica y Eléctrica (FIME), Ciudad Universitaria, San Nicolás de los Garza, Nuevo Leon, México |
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Abstract: | As the smart grid concept is employed in the electric power system, network load flow and topology changes intensively to meet the best generation-demand balancing point. These changes must account for protection devices to enhance their performance. The coordination of directional over-current relays is most commonly studied based on fixed network operation and topology within a mesh power system. But sub-transmission and distribution systems constantly operate differently to satisfy the variety of load demand levels throughout the day and year. Hence, if the setting of directional over-current relays changes according to the different operations of the system, then relay operation time and sensitivity can both be enhanced. This can potentially improve the protection performance in a smart grid system. Therefore, this study is carried out based on the comparison among three coordination approaches: conventional (fixed settings), discrete (groups of settings), and continuous or real time (dynamic settings). |
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Keywords: | relay coordination real time power system dynamics differential evolution smart grid directional over-current relay adaptive protection on-line coordination interconnected network distributed generation |
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