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Optimized Section-Wise Relay Coordination based on Coordination Time Interval using Standard Curves with Centralized System

This paper discusses a methodology to maintain the value of Coordination Time Interval (CTI) between the relay curves thereby reducing the total tripping time of the relays. In a changing micro-grid environment, the relay curve suitable for coordination should depend upon the topology, line length and the stiffness of available sources. A simple linear programming algorithm running in the Central Master controller(MC) to coordinate the relays using three different IEEE Standard curves by selecting each type of relay curve at a time has been developed. Main program in MC selects the type of curve and other relay parameters based on the value of Normalized CTI (NCTI). Thereafter MC updates the settings of all relays through reliable communication channel. An improved method of Section-wise relay coordination has been proposed for further reduction in the NCTI value by adjusting the coordination matrix of the linear program for each of the identified section in the relay coordination curve. The program flow logic of the MC controlled bi-directional over-current protection is also presented.