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This paper proposes an AC-DC five level solid state transformer (SST) topology with high frequency isolation and bidirectional power flow control capability. The topology is composed of two interleaved NPC-3L arms in primary side, and a single-phase full-bridge converter in the secondary side. The switching state diagram, the modulation and control strategies are presented as well as theoretical analysis of the converter is realized through the fundamental model in order to obtain the power flow curve, as in the traditional DAB converter. The theoretical study is validated through results obtained from an 800W experimental prototype of the proposed converter.

A SINGLE-PHASE FIVE LEVEL AC/DC SOLID STATE TRANSFORMER BASED ON THE INTERLEAVING OF NPC ARMS