超导限流器在柔性直流输电系统的应用及配置研究

Research on Application and Configuration of SFCL in VSC-HVDC

摘要: 柔性直流输电是未来可再生能源大规模接入和大范围互联的重要手段。本文针对柔性直流输电系统直流侧故障快速清除难题，提出采用基于超导体超导态/正常态快速转变特性的超导直流限流器配合直流断路器的方法，实现直流故障隔离。以某柔性直流输电系统为典型案例，采用PSCAD软件仿真对比在系统不同位置配置限流器对直流断路器截断电流、桥臂电流等抑制效果。研究结果表明：在柔直系统算例中负极架空线路出口配置限流电阻为10 Ω、失超响应时间为0.1 ms的电阻型超导直流限流器，可有效降低对直流断路器截断时间的快速性要求，提升多端柔直系统换流阀故障穿越能力。

Abstract: VSC-HVDC is an important means for large-scale access and large-scale interconnection of renewable energy in the future. Aiming at the problem of rapid removal of DC-side faults in VSC-HVDC, this paper proposes a method of SFCL based on superconductor superconducting state/normal state fast transition characteristics, combined with DC circuit breakers to achieve DC fault isolation. Taking one VSC-HVDC as a typical case, PSCAD software is used to simulate and compare the suppression effect of SFCL on cut-off current and bridge arm current in different positions of the system. The research results show that SFCL with current limiting resistor of 10 Ω and quench response time of 0.1 ms at the negative line of the VSC-HVD tramission line, can effectively reduce the rapid requirements of cut-off time for DC circuit breaker, improve converter fault ride-through capability of VSC-HVDC.