Study on characteristics of slow-front overvoltage of ±1100 kV UHVDC transmission lines

Autor: Jiqun Zhong, Qinya Qi, Hengxin He, Huiwen He, Ting Ding, Junjia He
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: The Journal of Engineering (2018)
Druh dokumentu: article
ISSN: 2051-3305
DOI: 10.1049/joe.2018.8429
Popis: The ±1100 kV Zhundong–Wannan ultra high-voltage direct current (UHVDC) transmission project is under construction in China, which has the highest operating voltage in the world. The length of the UHVDC overhead transmission line is greater than 3000 km. The electromagnetic transient process caused by grounding faults might have significantly impact on the overvoltage level of DC transmission line, which is crucial for the external insulation configuration of the overhead transmission line. This paper presents a detailed electromagnetic transient simulation model for the UHVDC transmission system using an open-loop extinction angle control principle. The simulation results demonstrate that the single pole grounding fault into a bipolar system causes the most serious damage. The maximum overvoltage is 1.628 p.u. and the 2% statistic overvoltage is 1.635 p.u., while the reference value is 1122 kV. The influence of DC filters for line overvoltage is also analysed here. Furthermore, results show that adding a no gap line arrester at the midpoint of transmission line can suppress line overvoltage, while the maximum overvoltage reduces by 0.138 p.u. The results obtained provides a reference for the optimisation of the external insulation configuration.
Databáze: Directory of Open Access Journals
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