Study on lightning overvoltage and commutation failure in UHV AC/DC hybrid system

• Published in: Journal of engineering (Stevenage, England) England), 2019-03, Vol.2019 (16), p.2677-2682
• Main Authors: Fang, Shengwei, Zhang, Li, Zou, Liang, Chen, Yongshuai, Wang, Yali
• Format: Article
• Language: English
• Subjects: 1000 kV UHV transformer substation; 1000 kV UHV transformer substation; arresters; DC system; high UHV AC/DC transmission line tower; HVDC power transmission; HVDC system; impact grounding resistance; invaded wave; lightning accidents; lightning overvoltage; lightning protection; lightning strike point; overvoltage; overvoltage protection; paper first analyses; poles and towers; power transmission lines; The 14th IET International Conference on AC and DC Power Transmission (ACDC 2018); transformer side lightning arrester; transformer substations; UHV AC/DC hybrid system commutation failure; valve current waveform; valve voltage; voltage 1000.0 kV; voltage 1000.0 kV; wave overvoltage; working voltage amplitude
• ISSN: 2051-3305; 2051-3305
• DOI: 10.1049/joe.2018.8791

Due to the high UHV AC/DC transmission line tower, the working voltage amplitude on the wire is large, causing lightning accidents. The paper first analyses the impact of lightning strike point on lightning overvoltage of 1000 kV UHV transformer substation and determines the research object of lightning intruding wave overvoltage. Second, the influence of the impact grounding resistance of transformer side lightning arrester and transmission line tower on invaded wave is analysed. Finally, the commutation failure of HVDC system was analysed, and the simulation tests were carried out by CIGER standard model in PSCAD and Simulink, valve voltage and valve current waveform can be used as a new basis for judgment. The conclusion shows that the analysis of UHV AC/DC hybrid system commutation failure should start from the DC system to study, and commutation failure directly related to the failure, operating conditions, and other factors.