Research on Fault Current Limiting of Magneto-Biased Superconducting DC Current Limiter in DC Distribution Network

In order to address the issue of short-circuit fault current limiting in DC power grids, this paper employs a new topology structure of magneto-biased superconducting DC current limiting device with characteristic of automatic triggering, multi-level current limiting, and fast recovery. The current constraining effect was simulated and examined using MATLAB/Simulink platform in DC distribution network models under 10 kV voltage level with short-circuit fault at different position. The results show that the current limit effect will change with the location of the bipolar short-circuit fault. In the early stage of fault occurrence, the maxmium current amplitude can be reduced by 20%, and the time when current peak appears will advance, providing important theoretical basis for the factual implementation of superconducting current limiters in DC grids in the near future.