Abstract Saturated iron core superconducting fault current limiter (SI-SFCL), which utilizes the saturation characteristics of iron core, has broad application prospects in handling with short circuit fault. SI-SFCL has the advantages of fast response speed, and the superconducting coils do not quench during the whole current limiting process. However, the research of SI-SFCL mainly focuses on AC systems, and there are few studies on its application in DC system. This paper analyzes the current-limiting mechanism of SI-SFCL in modular multilevel converter based high voltage direct current (MMC-HVDC) system. Based on PSCAD/EMTDC, the current-limiting characteristics of SI-SFCL in MMC-HVDC system are studied. The results show that SI-SFCL has strong limiting effect on the peak value of the short circuit current, but cannot limit steady-state current. Finally, the influence of magnetization current on the saturation of iron core and the current limiting effect of SI-SFCL is analyzed. The principle of selecting the appropriate magnetization current is given.
Tan Xiangyu,Ren Li,Tang Yuejin等. Study on the Current-Limiting Characteristics of Saturated Iron Core Superconducting Fault Current Limiter in MMC-HVDC System[J]. Transactions of China Electrotechnical Society, 2020, 35(zk2): 556-561.
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2020, Vol. 35 
