Under the background of "dual carbon" goal and energy structure transition, distributed renewable energy are vigorously developed, emphasizing the optimization and coordination of wind energy, solar energy, energy storage and other energy forms in order to improve the flexibility of power system. It is urgent to develop the key distributed energy grid connection technologies. Therefore, a distributed energy grid connection system based on current source converter (CSC) - voltage source converter (VSC) is introduced, and the corresponding coordinated control strategy is proposed. CSC is applied to the grid connection for ac distributed energy, and CSC-VSC constitutes a hybrid DC/DC converter that is applied to the grid connection for dc distributed energy. The proposed system realizes flexible regulation of distributed energy and has fault ride-through capability.