Generation and associated loads were viewed as a subsystem or a "micro-grid",micro-grid can improve the utilization of renewable energy and important load supply reliability.Currently the protection relay of LV system mainly is over-current protection,but simply over-current protection can no meet the requirements of micro-grid.In this paper,the electrical characteristics and fault characteristics of renewable energy and micro-grid system have been summarized,the new relay principle and configuration program have been proposed.The model of the micro-grid power system is simulated in PSCAD.
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