Abstract
Power electronic transformers (PETs) play a pivotal role in AC/DC hybrid distribution networks. However, there are few studies on the protection of PET. The safety of PET is seriously threatened by various internal faults. In this paper, internal faults of PET are classified according to fault positions and fault forms. The characteristics and hazards of different types of internal faults are analyzed and compared with external faults. The impacts of grounding mode, control mode, power direction and load level are considered in fault analysis. Moreover, an integrated protection system is established for PET. The principle and criterion of each protection relay are proposed based on fault characteristics. The correctness and effectiveness of fault analysis results and protection principles are verified via simulation tests.
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