Current-limiting characteristics of a modified flux-coupling type superconducting fault current limiter and its effects on the transient stability of a multi-machine power system

A modified flux-coupling type superconducting fault current limiter (SFCL) is proposed here for suppressing currents. The SFCL consists of a coupling transformer, an yttrium barium copper oxide (YBCO) pancake coil, and controlled switch. By flexibly adjusting the switch's contact states based on system operational conditions, transformer's primary inductance as well YBCO coil's normal-state resistance are incorporated into main limitation. Because has advantages resistive inductive SFCLs, it may improve power system's transient behavior. Hence, SFCL's effect stability multi-machine was also theoretically investigated. Further, simulations were conducted accessing performance characteristics under different conditions. results show that using can effectively restrain increased bus voltage sag; meanwhile, imitated power-angle oscillation be obviously reduced.