Design of Cascade Power Electronic Transformer Based Flexible Interconnection System for Distribution Network

With large number of grid-connected distribution photovoltaics, charging piles, the traditional distribution network faces challenges in power quality and power supply capacity. This paper proposes a flexible interconnection scheme based on cascade power electronic transformer for distribution network. The comparison of traditional power transformer and power electronic transformer is presented firstly. Then, the design of cascade power electronic transformer based flexible interconnection system is illustrated, including topology, control, and system scheme. Finally, experimental validation is provided.