Optimum Overcurrent Relay Coordination in Scaled-down IEEE 5-bus System for Changing Network Configuration

Abstract

Relay protection faces issues in supplying consistent power to the customers as the distribution network gets increasingly complicated. Several optimal relay coordination methods are available to determine the time multiplier setting while keeping the pick-up current setting constant. The main contribution of this paper is the rapid and reliable operation of overcurrent relays with coordination. The optimal time multiplier setting and pick-up current setting for each relay are tuned using genetic algorithm. The proposed technique is tested on the scaled-down model of IEEE 5-bus system. The data to perform relay coordination is obtained through the load flow and short circuit analyses using ETAP for different network configurations. The optimization problem defined for solving the time multiplier setting and the pick-up current setting is solved using genetic algorithm in MATLAB for any IEEE 5-bus configuration. These evolutionary algorithm-based adaptive settings are then employed in ETAP software to test the efficacy of the suggested relay coordination mechanism. Using Time-current characteristic curves of the tuned relays, the coordination is ensured. The results clearly show that the genetic algorithm tunes the relay settings at minimal operating time for any system configuration.
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