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As a new form of network in current power system, micro-grid is mainly used in low voltage network in the three-phase four-wire operation mode. Multi-access network form of distributed powers makes micro-grid protection have directional function, and has negative impact on the traditional distribution network current protection scheme. Based on the practical application of micro-grid and multi-port network theory, this thesis proposes a new directional protection method by using the fault component energy function. This work simulates various fault types in micro-grid built by PSCAD and utilizes Matlab to process experimental data. The results show that the method is correct for any fault type.