Impact of NOVEL HVDC superconducting circuit breaker on HVDC faults

Abstract

The key obstacle of very large discharge current of the DC-link capacitor, Voltage Source Converter-based HVDC (VSC-HVDC) is it is vulnerable to the DC short-circuit faults. Superconducting fault current limiter (SFCL) is an effective option to minimize commutation failure and increase the steady-state stability to mitigate the fault and also limit or reduce transient electrical surges that may occur in transmission and distribution networks of high-voltage direct current (HVDC) system. The SFCL can limit the fault current on the ac side of the converter and thus quickly restore the HVDC system to normal status. A NOVEL HVDC superconducting circuit breaker compared with resistive and no SFCL which can more effectively limit the amplitude of short-circuit current of the VSC-HVDC system has been presented in this literature. Finally, the fundamental design requirements including HVDC superconducting breaking NOVEL SFCL with current interruption for changing the intensity of different dc fault conditions are proposed. Simulation results have been presented for different fault condition in DC breaking combination of NOVEL, resistive and no SFCL with simulink toolbox of MATLAB 2014a are discussed.