High-voltage direct-current grounding limiting current control method and system

The invention discloses a high-voltage direct-current grounding limit current control method, and relates to the technical field of high-voltage direct-current engineering. The method comprises the following steps of acquiring the first current actual values of a pole 1 and a pole 2 of a direct-current system, and judging whether the grounding electrode current control is started or not accordingto a grounding limit current activation criterion; if the grounding limit current criterion is activated, calculating a first current limit target value and a second current limit target value; and comparing the first current limiting target value with the second current limiting target value, determining a final current limiting target value, and taking the final current limiting target value asa current limiting value for grounding electrode current control. According to the invention, accurate and dynamic limit control on the pole with a large actual current value is realized through grounding limit current control