用于柔性直流输电的电阻型超导限流器优化策略研究

The optimizing strategy of resistive superconducting current limiter applied to flexible HVDC

电阻型超导限流器应用于柔性直流系统的短路故障限流,可以有效降低与之配合的断路器开断要求。通过建立基于实测数据的YBCO超导带材短时电流冲击模型,发现超导带材失超电阻过小是影响限流性能的主要因素。针对此问题,提出了低温优化策略和带材结构优化策略,两种策略都可通过减少导电金属面积来达到节省带材的目的。最后,根据直流系统和限流器要求,提供了一种带材结构综合优化算法,并利用模型仿真验证了其有效性。

The resistive superconducting fault current limiter （RSFCL） can reduce the requirement of DC circuit breaker when applied to flexible HVDC short - fault current limiting. Through building the model of YBCO tapes under short current impact based on real data, it revealed that the low quench resistance of YBCO tapes was the main obstacle to current - limiting rate. The subcooled liquid nitrogen strategy and tapes structure optimizing strategy were proposed to solve this problem. The both strategies would save tapes consumption by reducing the area of conductive metal. Finally, according to the threshold of HVDC and RSFCL, an optimizing algorithm for tapes structure was proposed and proved valid by model simulation.