The high proportion of new energy connected to the power grid through power electronic devices seriously affects the safe and stable operation of the power system distribution network, and further improves the requirements for relay protection. The proposed collaborated control-protection technology is of great significance for the new power system, but the research in this area is relatively still less. Firstly, this paper summarizes the development and application of new energy grid-connected converter. Secondly, the basic principle and research status of collaborated control-protection technology were introduced. Finally, the paper summarizes the collaborated control-protection methods in the distribution network after the high proportion of new energy is connected to the grid, and looks forward to the future research direction and emphasis of collaborated control-protection method in new power system distribution network