Research on fault diagnosis of HVDC commutation failure

Commutation failure is one of the common faults in HVDC system, which has an adverse impact on the safe operation of the entire power system. Fast and accurate diagnosis for commutation failure plays an important role in controlling the commutation failure. Firstly this paper introduces the concept of HVDC system and situation of research on commutation failure fault diagnosis, in which the shortcomings of the current diagnosis methods are pointed out. Secondly, through analysis of characteristics and influence factors, the hazards and pre-control measures of commutation failure are proposed. Finally, this paper puts forward a new fault diagnosis method of commutation failures based on wavelet energy spectrum and grey comprehensive relationship degree. The results verify the effectiveness and accuracy of the method for commutation failure.