随着风电、太阳能等新能源的开发与应用，基于电压源型换流器的高压直流输电技术（VSC-HVDC）在直流输电领域占据越来越重要的位置。本课题针对VSC-HVDC电网的直流侧的短路故障问题，开展直流超导限流器的基础问题研究。一方面，研究YBCO超导带材的快速过流冲击特性、带材的电磁场-热场非线性耦合关系及其失超恢复问题，研究带材性能退化和局部损坏的微观规律及其与过流冲击的关系，掌握YBCO超导带材在面向VSC-HVDC电网故障冲击下的暂态性能变化规律。另一方面，研究VSC-HVDC电网的直流侧的短路故障检测和预测方法，提出面向VSC-HVDC电网的新型直流超导限流器拓扑、设计一台2kV/5kA直流超导限流器样机，用于超导限流器与直流断路器和换流器的匹配运行方法的研究。本课题研究工作对有效限制短路故障电流、推动直流断路器在VSC-HVDC电网的应用和提高电网运行稳定性都有非常重要的意义。

With the development and application of new energy sources such as wind power and solar energy， VSC-HVDC system plays an important role in the field of DC power transmission. In this program, aimed at limiting the short-circuit current in DC side of the VSC-HVDC system, the fundamental research of DC superconducting current limiter (SFCL) is carried out. On the one hand, the rapid over-current shock characteristics of YBCO superconducting tape is studied, and the relationship of electromagnetic field - thermal field nonlinear coupling of the tape is analyzed, and the quench recovery problems are studied, and the performance degradation and microscopic regularity of local damage of the tape is studied, so as to master the transient performance of YBCO superconducting tape in the rapid over-current shock of VSC-HVDC system. On the other hand, short-circuit fault detection and prediction methods of VSC-HVDC system is studied, and a novel topology of SFCL is proposed, and a 2kV/5kA prototype of the DC SFCL is designed to study matching operation method of the DC SFCL with the DC circuit breaker and the converter of VSC-HVDC system. The research has very important meaning limit short-circuit current effectively, to promote the DC circuit breaker in the application of VSC-HVDC system, and to and to improve the operation stability of the system.