Electromagnetic Design and Performance Analysis of a Hybrid-Type Superconducting Fault Current Limiter in Shipboard MVDC IPS

As medium voltage dc-based (MVDC) technology is widely considered in the shipboard power system (SPS), the short fault protection of shipboard IPS is urgent. Superconducting fault current limiter (SFCL) is an efficient way to solve the short fault problems in shipboard MVDC IPS. A hybrid type SFCL (H-SFCL) based on a non-quenching inductor and two resistors is electromagnetic designed in this study. The H-SFCL can limit short fault current with no quenching and little heating. In this study, the short fault mechanism and mathematical model of MVDC SPS bipolar short fault is analyzed. According to current limiting performance requirements in MVDC SPS, components parameters of H-SFCL are optimized matching. The scheme of annular structure inductors is proposed and electromagnetic design of a 10 kV/6 kA H-SFCL is completed based on a genetic algorithm. The ac loss and thermal stress of the designed magnet are evaluated. The simulation results show that the H-SFCL with optimized electromagnetic parameters meets the design requirements.