Research on the topology and control strategy of bidirectional DC-DC converter used in the power electronic transformer

摘要

With the development of distributed power, and based on the advanced ideas of FREEDM system (the Future Renewable Electric Energy Delivery and Management System), the Power electronic transformers has gained increasing importance in the future power distribution system. In this paper, Bidirectional DC-DC Converter topology used in the power electronic transformer is introduced, which can optimize the smart grid and AC/DC hybrid power distribution network to realize plug-and-play. The control strategy of the Cascaded DC-DC converter were analysed, and optimization study was did on the voltage-sharing and voltage regulator segment on the DC side. Simulation models were built in PSCAD to validate the proposed control methods in the voltage-sharing and voltage regulator, etc. The result prove that, the bidirectional DC-DC converter topology can achieve soft-switching, and the control methods can balance and regulate the DC output voltage.