Characteristics of Superconducting Coil-Type DC Fault Current Limiter to Increase Stability in the Grid Connection PV Generation System

In this study, superconducting coil-type dc fault current limiter (SC-DC FCL) was proposed. The interruption and operation characteristics of the SC-DC FCL were analyzed, which was applied to a 7.98 kW-class photovoltaic (PV) generation system. Electro magnetic transients including direct current/power system computer aided design (EMTDC/PSCAD) have been used for the simulation. The simulation results showed that the interruption operation time of the mechanical circuit breaker, the power burden applied to the circuit breaker, and the peak value of the fault current were significantly reduced by the application of the SC-DC FCL. In addition, when the SC-DC FCL was applied, the fault current flowing through the line was limited by approximately 78% or more.