Method for detecting phase change failure of high-voltage direct-current power transmission system

The invention discloses a method for detecting phase change failure of a high-voltage direct-current power transmission system. The method is characterized by comprising starting from a phase change process mechanism and considering the harmonic voltage phase change time area on the basis of a phase change voltage time area method. According to the method for detecting the phase change failure of the high-voltage direct-current power transmission system, the influence of harmonic waves on the phase change failure can be quantitatively analyzed and can serve as a criterion of the detection on the phase change failure of the high-voltage direct-current system.