As the representative of renewable energy

wind/solar grid-connected generator has an emerging deep impact on the distribution system. The domestic and foreign engineering and academic circles pay considerable attention to the research of microgrid. A conclusion is first put forward that the internal short circuit current is provided by micro power supply through the analysis of the microgrid formation way. Then

the microgrid protection faces special problems are put forward too

which are poor selectivity

low sensitivity and easy taking off from the network caused by micro power. Based on the local information and multi-ground information

the microgrid protection research status is inducted and analyzed. The key technology

implementation scheme and further research ideas are discussed for solving the problems faced by microgrid protection. This work is supported by National High Technology Research and Development Program of China (863 Program) (No. 2015AA050603).