Abstract: A LCC converter topology based on thyristor full bridge energy dissipation sub module (TED-FBSM) was proposed to mitigate the commutation failure in line- commutated-converter high voltage direct current (LCC- HVDC), which can effectively inhibit the growth of transient dc current and reduce the probability of commutation failure. In this paper, different working modes of the sub-module were presented, the control strategy of sub-module under different working conditions was proposed and the design method of sub-module parameters was also presented, the energy consumption and heat dissipation problems of the energy dissipation resistance were analyzed. Finally, the simulation analysis was carried out in PSCAD, and the simulation results show that the designed control parameters are reasonable, the voltage and current stress of the sub moldule are within a reasonable range, and the energy consumption of the resistance can also meet the requirements. Furthermore, the proposed topology can effectively mitigate the commutation failure and improve the transient characteristics of the system.