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Abstract. By means of electromagnetic transient simulation program, a detailed model of High Voltage Direct Current (HVDC) power transmission system actually operated in current power grid is built, and detailed variation of electric quantities, the duration of commutation failure and its impacts on AC power transmission grid as well as DC block during the commutation failure process in that system are analyzed. Research results show that commutation failure leads to severe fluctuation of such electrical quantities as DC current, DC voltage and DC power, however the duration of the fluctuations usually is no longer than 100ms, so its impact on AC power system is transitory, meanwhile there is low probability of DC block caused by commutation failure.

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