Research of a Resistive-Type SFCL for Protection of a Power Electronic Transformer

摘要

The stability of a power electronic transformer (PET) under short-circuit faults is a crucial issue. In this paper, the output-terminal fault of the PET is considered, and a resistive-type superconducting fault current limiter (SFCL) is applied in the PET for guarding against the fault surge. The configuration structure of the PET integrating with the resistive-type SFCL is presented, and the SFCL's potential influence on the PET's fault current is theoretically probed. Using the MATLAB platform, the digital model of the PET-SFCL is built, and the three-phase fault scenario is simulated. The simulation results reveal that the resistive-type SFCL enables to very usefully refrain the three-phase fault currents of the PET. The fault current level can be stably suppressed lower than the safety margin, and the PET's stability during the fault is availably increased.