Analysis of Subsequent Phase Change Failure with Fault Division Angle and Single-phase Grounding Faults

Some achievements have been obtained in analyzing factors affecting commutation failure, but the influence of fault remove time (fault division angle) on commutation failure needs further study. Firstly, based on the commutation failure process and the time area of commutation voltage, influence of fault division angle on subsequent commutation failure is analyzed. It was found that the risk of subsequent commutation failure is most significant when the fault is removed in commutation. The influence of fault clearing time on the zero-crossing offset angle is further analyzed Finally, taking single-phase grounding fault as an example, simulation test results of different initial fault angles and fault division angles based on PSCAD/EMTDC and CIGRE HVDC models verify the correctness of the theoretical analysis.