Study on Coordination of Resistive-Type Superconducting Fault Current Limiter and DC Circuit Breaker in HVDC system

Due to the poor damping characteristics of the high voltage direct current (HVDC) grid, the fault current will rise sharply when a short-circuit fault appears on the DC side of the HVDC system. State-of-the-art of fault current isolation techniques is a combination of a superconducting fault current limiter (SFCL) with a high voltage DC circuit breaker (DCCB), which is one of the most economical and effective candidates to isolate the fault current. Based on the analysis of resistive-type SFCL and DCCB modeling, a fault isolation strategy based on the cooperation of a resistive-type SFCL and a DCCB is proposed in the HVDC system. The simulation results show that the proposed scheme can provide a positive significance to suppress the DC fault current, and the HVDC system’s robustness can be enhanced as well.