Study on Field Suppression Unit in DC Excitation System for Saturated Iron-Core Superconducting Fault Current Limiter

作者：JiBin Cui, YuWei Sun, Hui Hong, Xiaoye Niu, Bo Tian, Qiang Li, JingYin Zhang, Weizhi Gong, Ying Xin · 发表于：IEEE Transactions on Applied Superconductivity · 年份：2014 · DOI：10.1109/tasc.2014.2340440 · 被引用次数：8 · 研究领域：HVDC Systems and Fault Protection、High-Voltage Power Transmission Systems、Real-time simulation and control systems

As the most likely applicable fault current limiting device in the future, saturated iron-core superconducting fault current limiter (SISFCL) has many superior attributes. In a SISFCL, DC excitation system plays a key role during the operation in power grid. It not only outputs dc excitation current to make iron core saturated, but also absorbs magnetic energy stored in superconducting coil and suppresses the reverse voltage, a disaster to superconducting coil, high speed switch IGBTs and other circuit elements, to a safe level instantly when a fault happens. Field suppression unit is mainly used to achieve the second function mentioned above. This paper introduces SISFCL device and its DC excitation system briefly, then analyzes and discusses field suppression unit in detail. This work bases on research and manufacturing of 220 kV/300 MVA SISFCL, which has been developed and put into operation in power grid in China.