Research on the abnormal discharge law of HVDC transmission converter valve and its improvement measures

Aiming at the problem of abnormal discharge of HVDC converter valve, this paper takes ± 500kV valve tower as the research object, builds the electric field simulation analysis model of converter valve tower, solves the electric field distribution of converter valve shielding system and various components under insulation type test condition and operation conditions and determines the uneven position of converter valve electric field distribution. On this basis, this paper proposed improvement measures and verified their effectiveness through high-voltage tests.