Abstract
This paper presents a methodology for protection coordination in microgrids that considers account non-standard features of directional over-current relays (OCRs). In the proposed approach three decision variables are considered for each relay; namely, the standard characteristic curve (SCC), Time Multiplier Setting (TMS) and maximum limit of the plug setting multiplier (PSM). The proposed mixed integer non-linear programing model is solved by means of a specialized genetic algorithm (GA) implemented in Matlab. Several tests were performed on a modified version of the IEEE-30 bus test system considering on-grid and off-grid operational modes. The results evidenced the robustness and applicability of the proposed approach in real-size microgrids that host distributed generation and exhibit several operational modes or topologies.
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