Abstract: Aiming at the problem of commutation failure in the line commutated converter based high voltage direct current（LCCHVDC） transmission system due to thyristors as commutation devices, taking the application of integrated gate commutated thyristors（IGCTs） in a back-to-back HVDC project in China as the basis, the topology and basic operating principles of IGCTtype HVDC are firstly described. Then, a shut-off strategy adapted to the IGCT valve is proposed to balance the commutation failure suppression effect and the IGCT valve shut-off stress. On this basis, the impacts of different types of AC faults on the fault current peak value are studied. A strategy of dynamically adjusting the current controller parameters by using fault disturbance coefficients is proposed to achieve fault current suppression and stable DC power transmission during faults. Finally, the correctness and effectiveness of the proposed strategy are verified through real-time digital simulation（RTDS）.