Abstract
This paper presents a three-phase cascaded Power Electronic Transformer (PET) based on energy internet. The proposed PET can allow direct connection with the high voltage and provide a stable DC interface for Distribute Generation (DG) and load. It consists of three Cascaded H-Bridge (CHB) converters with star configuration and output-parallel isolated DC/DC converters with intermediate frequency transformer. The two parts are designed separately in closed loop. Specifically, a simple control method is proposed to balance individual inphase and interphase DC voltages of three-phase CHB converter. The control method based on a phase-shifted pulse width modulation scheme can be extended to different voltage levels. The validity and performance of the proposed topology and the control strategy is verified by simulation. (6 pages)
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