Abstract
The micro-grids with distributed generators enhance the aggregate power supply to the increasing load demand. However, the conventional over current relay protection may fail to operate when magnitude and direction of current differs significantly in grid connected mode and islanded mode depending upon DGs types and generating capacity. This paper presents a differential protection scheme using S-transform for detection and phase identification of faults in distribution systems integrated with different types of DGs. A radial distribution system with photovoltaic and synchronous distributed generators is simulated for data generation in PSCAD/EMTDC software. The proposed technique is tested on various fault cases and confirms accurate detection of faults and correct identification of faulty phases within a cycle for a 50 Hz grid nominal frequency.
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