基于SSI的插入式基础输电铁塔振动可靠度研究  

Research on Vibration Reliability of Plug-in Foundation Transmission Tower Based on SSI

作　　者：杨晓峰 唐波[1,2] 詹东博 姜岚 刘钢[1] 张灿 YANG Xiaofeng;TANG Bo;ZHAN Dongbo;JIANG Lan;LIU Gang;ZHANG Can(College of Electrical Engineering&New Energy,China Three Gorges University,Yichang,Hubei 443002,China;Hubei Provincial Engineering Technology Research Center for Power Transmission Line,Yichang,Hubei 443002,China;Hubei Electric Power Company Huanggang Power Supply Company,Huanggang,Hubei 438000,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002 [2]湖北省输电线路工程技术研究中心,湖北宜昌443002 [3]国网黄冈供电公司,湖北黄冈438000

出　　处：《南方电网技术》2022年第3期91-99,共9页Southern Power System Technology

基　　金：湖北省重点研发计划项目(2020BAB110)。

摘　　要：由于插入式基础输电铁塔塔腿主材直接与基础相连,这种独特结构导致传统输电铁塔可靠度计算方法不再准确。为此,考虑地基土壤与塔腿之间的土壤-结构动力相互作用(soil-structure dynamic interaction,SSI),将原铁塔固有圆频率和频率比的上限值用考虑SSI后的相应值替代,提出了一种基于SSI的插入式基础铁塔振动可靠度分析方法。首先对铁塔进行模态分析,得到考虑SSI的铁塔固有圆频率;然后根据导线覆冰舞动下铁塔的外部荷载和考虑SSI的铁塔振动位移方程,推导了铁塔的综合振幅放大因子表达式,进而得到了考虑SSI的频率之比上限值和功能函数;最终结合正态分布求解,获得考虑SSI的插入式基础铁塔振动可靠度。提出的方法在500 kV宜都-兴隆Ⅰ回线路舞动事故分析中得到了应用,采用本方法得到的受损6基插入式基础铁塔可靠度最大值为0.9713,小于目标可靠度0.9993。Since the main material of the plug-in foundation transmission tower legs is directly connected to the foundation,this unique structure causes the traditional transmission tower reliability calculation method to be no longer accurate.For this reason,this paper considers the soil-structure dynamic interaction(SSI)between the foundation soil and the tower legs,replaces the upper limit of the natural circular frequency and frequency ratio of the original iron tower with the corresponding value after considering the SSI,and proposes an SSI-based insertion analysis method of vibration reliability of type foundation iron tower.First,the modal analysis of the tower is performed to obtain the natural circular frequency of the tower considering SSI;then according to the external load of the tower under the icing of the wire and the tower vibration displacement equation considering the SSI,the comprehensive amplitude amplification factor expression of the tower is derived,and then the expression is obtained.The upper limit value of the frequency ratio and the function function considering SSI are considered;finally,the normal distribution is combined to solve the problem,and the vibration reliability of the plug-in foundation tower considering SSI is obtained.The proposed method has been applied to the galloping accident analysis of the 500 kV Yidu-XinglongⅠcircuit line.The maximum reliability of the damaged 6-base plug-in foundation tower obtained by this method is 0.9713,which is less than the target reliability of 0.9993.

关 键 词：插入式基础铁塔 覆冰舞动 SSI效应 振动可靠度 固有圆频率 

分 类 号：TM753[电气工程—电力系统及自动化]