Otimização de ajustes de relés direcionais de sobrecorrente em linhas de subtransmissão em anel

Abstract

The use of a tuning optimization study is extremely important in the process of parameterizing overcurrent relays, and is therefore a tool to support the decisionmaking of the protection engineer responsible for preparing the protection coordination study, making the study accurate and fast. In this dissertation, the aim was to optimize the coordination of directional overcurrent relays installed on transmission lines in meshed systems. To this end, a computational tool was developed on the Scilab platform using the PSO - Particle Swarm Optimization algorithm. The main functionalities of the application are: (i) automatic calculation of short-circuit conditions (on buses and close-in on lines), (ii) determination of the restrictions to be met, (iii) automatic determination of the Objective Function to be minimized, (iv) optimization of the curves of the IEC and IEEE families. The proposed optimization technique yielded promising results, with satisfactory fault clearance times that met all restrictions imposed by the analyzed system, in addition to ensuring the elimination of the defect in all stages of protective relay operation, without compromising the desired selectivity.