Abstract: As a new type of power electronic transformer, power electronic transformer (PET) can realize the functions of AC/DC system flexible networking, power routing, and power quality management. The PET technology provides a feasible development scheme for enhancing the regulation ability of distribution system and for increasing the penetration rate of renewable energy. Therefore, based on the configuration characteristics of AC/DC hybrid distribution system with pet, a grid structure planning method is proposed. Firstly, the access type, voltage level, geographical location, and power characteristics of the device to be planned are adopted as the matching characteristics, and the optimal AC/DC partition of the source load storage equipment in the planning area is carried out. Secondly, the optimal system investment and operation economy are taken as the objectives, a network structure optimization model is established considering the port constraints and partition transfer path constraints of pet, and the model is simplified as a double-layer network structure. Finally, the model is solved iteratively. The analysis results of practical engineering cases show that the proposed method can be adopted not only to solve the optimal integration of terminal source charging and storage equipment, but also to solve the problems of location and capacity of pet and multi terminal interconnection of electronic supply area. At the same time, compared with the traditional AC power distribution system, the grid structure of hierarchical system with pet obtained by the proposed method has low complexity and can realize the complementary coordination of source charging and storage in local links. Furhermore, the balance and mutual benefit of electric energy in the system are taken into consideration to prove the practical value of pet from the perspective of planning and configuration.