Abstract： A simulation model of microgrid was built, the characteristics of fault current were analyzed, and the existing microgrid protection technologies were reviewed in this paper. First, simulation model of IIDG was built to study fault characteristics and verify the stability of microgrid while different faults occur on the transmission line. Then, the simulation model of microgrid was built to study fault characteristics under islanded mode and gridconnected mode.The result shows that it is necessary to study new protection strategies which do not depend on the fault current effective value. After that, the latest research progresses of microgrid protection technologies were summarized and the advantages and disadvantages of various protection technologies were analyzed. Finally, the research direction and the research objective were prospected, pointing out that the extensiveness of information collection and the integration of protection function were the aims of microgrid protection.
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