High-voltage direct-current transmission commutation anomaly detection method and device

The invention discloses a high-voltage direct-current transmission commutation anomaly detection method and device. The method comprises the following steps: acquiring commutation parameters during operation of a direct-current transmission system; judging whether the commutation parameters are normal or not; if the commutation parameter is abnormal, judging whether the waveform has a fault or not in the commutation process according to an extinction angle commutation waveform judgment method; if the waveform is a fault state waveform, judging that commutation fails; if the waveform is a normal state waveform, judging that the commutation is abnormal but the commutation does not fail; obtaining a commutation operation parameter sampling range of a direct current power transmission system, and calculating a commutation overlapping angle value according to an operation condition; judging whether the commutation of the converter valve is abnormal or not through the quantitative judgment and comparison of the com