A current compensation type superconducting fault current limiter

Current compensation type superconducting fault current limiter is a novel topology of FCL, which consists of an equivalent AC current source with a limiting resistor in parallel. It connects power systems in series with a transformer. At normal state, the current of equivalent AC current source is consistent with the system current and the limiter has no effect on the system. But under fault condition, the system current is greater than the current of equivalent AC current source and the limiting resistor takes effect immediately. The application circuit and its control system are presented. Simulation results show that the SFCL can reduce both transient and steady-state fault currents significantly.