Commutation failure is one of the most common faults for high voltage direct current (HVDC) receiving end power grid. In order to reduce the probability of continuous commutation failure in HVDC power transmission system, the mechanism of commutation failure and the action logic of HVDC system control link was analyzed. Then, based on VDCOL (voltage dependent current order limiter) control which was widely used in HVDC, a novel control method was proposed. Predictive module will reduce the inverter trigger angle and increase commutation margin in advance, at the same time, the rectifying side will compensate for the trigger angle for restrain DC current rise. And then, substitute AC bus voltage for the starting voltage of VDCOL. Based on the CIGRE benchmark model of HVDC, the proposed method was tested in PSCAD/EMTDC. The simulation results show that, the proposed method can suppress continuous failure during short circuit fault, improve the fault recovery performance effectively, and ensure the normal operation of HVDC transmission system.
