Application of fault current bypassing method using double-thyristor module on full-bridge MMC based AC/DC hybrid distribution system

With the growing interest in reducing carbon emissions, the integration of Renewable Energy Source(RES) is becoming more active. Recent studies have shown that constructing an AC/DC hybrid power system, rather than connecting individual power conversion devices to the traditional AC power system, is more effective in reducing power conversion losses. This AC/DC hybrid power system is based on the Modular Multilevel Converter(MMC), which can be categorized into Half-Bridge MMC(HB-MMC) and Full-Bridge MMC(FB-MMC) depending on the type of submodules. In this paper, we verified the effectiveness of applying a bypassing method using thyristors to a FB-MMC equipped with a blocking function when Pole-to-Pole(PTP) fault occurs by comparing the di/dt using Matlab/Simulink software.