Journal
JOURNAL OF ENGINEERING-JOE
Volume -, Issue 16, Pages 1346-1349Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/joe.2018.8774
Keywords
failure analysis; power transmission faults; HVDC power convertors; HVDC power transmission; commutation; turn-off angle; landing amplitude; zero-crossing; AC bus line voltage; AC bus voltage; commutation failure analysis fall; zero sequence voltage peaks; fault recording; high-voltage direct current transmission system; converter station; voltage 50; 0 kV
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Commutation failure of the high-voltage direct current (HVDC) transmission system is common fault in a converter station. The fault recording in one converter station when commutation failure caused by the disturbance of the AC system was collected, and the turn-off angle of valves, zero-crossing offset, and landing amplitude of bus voltage were calculated and statistically analysed. The results suggested that, in the case of commutation failure, the turn-off angle of the 82% of cases was <8 degrees, and there were a few cases whose turn-off angle was very nearly the same as that in normal operation. The number of cases whose zero-crossing offset was <10 degrees accounted for 95% of the total, and the zero-crossing offset of the AC bus line voltage generally presented a positive correlation with the reverse cut-off time of the valves. The landing amplitude of the AC bus voltage before the time point for commutation failure analysis fall within 10% for >90% cases, and the average was approximate to 4.6%. The number of cases, whose zero sequence voltage peaks was <50kV, accounted for 97% of the total. The results will provide basic data for analysing the main influencing factors of commutation failure and setting up countermeasures for the HVDC system.
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