A Study on the Modeling of Superconducting Fault Current Limiters Using EMTDC

Abstract

An effective modeling and simulation schemes of a resistive type Superconducting Fault Current Limiter (SFCL) and DC reactor type SFCL using PSCADIEMTDC are proposed in this paper. In case of resistive type SFCL, current limiting is implemented by the ultra-fast transition characteristics from the superconducting (non-resistive) state to the normal (resistive) state by overstepping the critical current density. The states can generally be divided into three sub-states: the superconducting state, the quench state and the recovery state, respectively. In case of DC reactor type SFCL, it is composed of a superconducting coil and a diode bridge through which AC line current is rectified, and the increase in fault current is limited by the inductance of a superconducting coil. An actual experiment based component model of the real resistive type SFCL is developed and applied for the simulation. The proposed modeling and simulation schemes can be implemented to the grid system readily under various system conditions including sort of faults and the system capacity as well. The simulation results demonstrate the effectiveness of the proposed model and simulation schemes.