台风暴雨灾害下的110 kV线路倒塔与断线事故评估方法  

Assessment Method of Tower Falling and Line Disconnection Accidents for 110 kV Line in Typhoon and Torrential Rain Disaster

作　　者：王增平 相禹维 王彤 WANG Zengping;XIANG Yuwei;WANG Tong(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市102206

出　　处：《电力系统自动化》2022年第3期59-66,共8页Automation of Electric Power Systems

基　　金：国家电网公司总部科技项目“新能源电力系统协同控制保护系统及应用”。

摘　　要：沿海地区台风暴雨灾害频发,极易引发输电线路倒塔、断线等事故。为此,针对110 kV输电线路提出一种同时考虑台风暴雨灾害下倒塔与断线事故的评估方法。首先,分别建立台风与暴雨荷载模型,刻画台风风场中任意位置的风雨荷载;其次,对110 kV线路不同的输电塔型分别建立有限元模型,考虑风雨荷载的相关性,分析风雨荷载下线路和铁塔的动力响应;接着,基于结构可靠性理论,推导倒塔、断线概率表达式,研究不同塔型、用途、风向角等因素对倒塔的机理影响,分析电网薄弱环节,评估台风暴雨灾害下110 kV线路倒塔与断线事故;最后,仿真采用中国某地区实际电力系统和真实台风数据,验证所提方法的适用性。Typhoon and torrential rain disasters occur frequently in coastal areas,which is highly possible to cause accidents such as tower falling and line disconnection of transmission lines.Therefore,an evaluation method of tower falling and line disconnection accidents considering typhoon and torrential rain disasters is proposed for 110 kV transmission lines.Firstly,load models in typhoon and torrential rain are established respectively to describe the wind and rain loads at any position in the typhoon wind field.The finite element models for the different transmission tower types of 110 kV lines are established respectively.Considering the correlation of wind and rain loads,the dynamic response of lines and towers with wind and rain loads is analyzed.Based on the structural reliability theory,the probability expressions of tower falling and line disconnection are derived,the mechanism effects of different tower types,purposes and wind angles on tower falling are studied,the weak links of power grid are analyzed,and the tower falling and line disconnection accidents of 110 kV lines in typhoon and torrential rain disasters are evaluated.Finally,the simulation uses the actual power system and real typhoon data in a region of China to verify the applicability of the proposed assessment method.

关 键 词：台风 暴雨 倒塔 输电线路 断线 可靠性评估 

分 类 号：TM752[电气工程—电力系统及自动化]