Microgrid protection is one of the crucial technologies of microgrid. In this paper, a new microgrid protection scheme was proposed, which is suitable for microgrid working in both grid-connected and island modes. We proposed a solution for the challenging problem in AC microgrid, as the limitation for fault current level, the effect on the protection by the change of power direction and the complexity of microgrid network structure. This paper also analyzed theory and practical application of the protection scheme proposed, and the validity and good performance of the protection scheme was validated.
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