特高压换流站阀厅屋面系统风灾风险评估

WIND RISK ASSESSMENT OF THE UHV CONVERTER STATION VALVE HALL ROOF SYSTEM

  • 摘要: 为评估西北地区特高压(Ultra-high voltage, UHV)换流站阀厅屋面系统的风致损伤和损失,提出了一种基于性能的风工程(Performance-Based Wind Engineering, PBWE)框架下的风灾风险评估方法。开展风洞试验确定了阀厅屋面极值风压,统计气象站实测数据确定了新疆哈密地区的风速概率分布及风灾危险性,基于阀厅屋面系统的有限元分析,应用上述评估方法进行了多风向工况下的风灾易损性分析和风灾风险评估,并讨论了风向的影响。结果表明:哈密地区东南(NE)风向方位的风灾危险性最大;阀厅屋面系统的损伤概率(风灾易损性)和年失效概率(风灾风险)随风向角(0º~90º)的增大先增后降,其对风向角的敏感度随损伤状态的发展而增大;该地区特高压换流站阀厅屋面系统的风揭损伤主要集中在轻度损伤~重度损伤,几乎不发生脱扣破坏,推荐按东南-西北(SE-NW)朝向建造。

     

    Abstract: A wind risk assessment method based on performance-based wind engineering (PBWE) framework is proposed to assess the wind-induced damage and loss of the ultra-high voltage (UHV) converter station valve hall roof system in the northwest region of China. A wind tunnel test is conducted to determine the extreme wind pressure on the valve hall roof. The wind speed probability distribution and wind hazard in the Hami region of Xinjiang are determined using the measured data from the meteorological station. Based on the valve hall roof system finite element analysis, the wind fragility analysis and wind risk assessment in multiple wind directions are carried out using the aforementioned method, and the effect of wind direction is discussed. The results show that the highest wind hazard is in the southeast (NE) wind direction of the Hami region. The damage probability (wind fragility) and the annual failure probability (wind risk) of the valve hall roof system increase first and then decrease with increasing wind angle (0º~90º), and the sensitivity to wind angle increases with the development of damage state. The wind-induced damage to the UHV converter station valve hall roof system in the Hami region mainly occurs in the range of slight damage to severe damage, and almost no occlusion failure. It is recommended to construct the valve hall in the southeast-northwest (SE-NW).

     

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