Closing control method of high voltage DC breaker

摘要

The present invention relates to a method for controlling the closing of a high-voltage DC breaker. The method first conducts the blocking units of the blocking branch 2 group by group, then makes the on-state branch 1 conductive, and finally cuts off the blocking branch. In the process of conducting the blocking units of the blocking branch by group, it is determined whether or not a failure occurs in the transmission system after continuing the blocking units of the current group. If there is no failure, the next blocking unit is made conductive, and after all the blocking units of all the groups have been fully conducted, the next operation is continued. If a failure occurs, And closes the closing operation. The method can pre-charge the power transmission system in the process of closing the high voltage DC breaker, thereby reducing the overvoltage generated in the closing operation and the oscillation of the system.