Fault Current Limitation Coordination in Electric Power Grid With Superconducting Fault Current Limiters

This paper proposes the concept of “fault current limitation coordination” in a future electric power grid with multiple superconducting fault current limiters (SFCL). Not only the fault current limitation of each SFCL on a transmission line, but also the transient stability of the grid with SFCLs should be taken into account, because the disturbance is brought about in the grid by the sudden appearance and disappearance of a large impedance of SFCL at the fault current limitation and recovery after the fault clearance, respectively. In this paper, both of the fault current limitation of SFCLs and the internal phase angle oscillation of generators were calculated by PSCAD/EMTDC to evaluate the operational feasibility or coordination of SFCLs in a 275/77-kV transmission system model.