Optimal protection coordination of directional overcurrent relays using shuffled frog leaping in smart grids
Objectives: The ability of the frog algorithm to optimize overcurrent relays. Methods/Statistical Analysis: Adjusting the over-current relay is different in the multi-grid arrangement. If directional overcurrent relays are set for a micro-grid arrangement, no longer is this relay setting suitable for other microgrid arrangements By limiting current changes by FCL in different makeup and considering a setting for all the relays, micro-grid protection coordination can be maintained in all make-ups. Findings: The ability of the frog algorithm to optimize overcurrent relays is evaluated. It is also compared to its ability to solve the optimization problem by genetic algorithm. The objective function of this problem is to optimize the total operating time of all relays in all arrangement. Also, the main concern is the protection distance between the primary relay and the backup relay. The problem of over-current relay coordination tested by the method of shuffled frog leaping algorithm (SFLA) on a 9-BUS system in two different scenarios and compared with the results of the work in the method of genetic algorithm. In this paper, the results show that the convergence rate in SFLA is greater than GA, and the convergence time in SFLA is less than GA. Application/Improvements: The proposed method can also be adapted to optimize the total operating time in the distribution section of the IEEE standard 30-bus system in the future.
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