Considering the disadvantages that converter utilized for the high voltage direct current (HVDC)transmission projects cleans the DC side fault in current operations, it seriously restricts the application of overhead line to HVDC transmission projects.This paper focuses on the full bridge module of multilevel converter topology structure with bridge arm composed of full bridge modules (FBSM).Then the working principle of full bridge MMC and full bridge MMC mechanism is analyzed to achieve cleaning fault in the DC side.Finally, the full bridge switch converter is simulated via the software PSCA...