台风作用下的架空输电线路动力响应研究
发布时间：2018-10-18 15:18
【摘要】：我国沿海地区经常遭受台风等恶劣天气的侵袭。作为电能输送的重要载体,架空输电线路安全可靠运行对沿海地区的发展具有十分重大的作用。然而架空输电线路具有高柔、轻质、小阻尼特性,对风载荷具有很强的敏感性,难以逃脱台风这种强风载荷的侵袭,给当地的经济建设和发展造成了巨大的损失。从当前输电线路的抗风设计来看,对于沿海输电线路,大都按照满应力计算规则,对于台风这种高强度高湍流的风载荷,采用放大系数的方法,进行静风等效作用分析,却忽略了台风高湍流带来的强脉动特性。为了研究输电塔线体系在台风风载荷作用下的动力响应,本文从以下几点展开了研究:首先选取了YanMeng台风风场作为台风平均风的模拟模型,并结合相关资料,对“威马逊”台风进行反演,确定模型参数,验证YanMeng台风风场的适应性;随后采用模拟圆法,结合近50年来登陆海南省的热带气旋资料,对热带气旋的关键参数进行了概率统计分析,并采用Monte Carlo模拟方法,结合YanMeng台风风场,推算了海口市的极值风速,给出了一种利用热带气旋资料计算极值风速的方法。其次介绍台风脉动风的相关特性,并以海南省海口市2014年“威马逊”台风对当地一基110kV猫头塔造成的倒塔事故为工程背景,在ANSYS中建立了一塔两线的输电塔线体系,采用石沅台风风谱模拟了该输电塔线体系工程环境下的脉动风风速。最后在ANSYS中进行了台风作用下的输电塔线体系风致动力响应分析,对比研究了在不同风载荷作用模式下的输电塔线体系风载荷效应和对应的线条风对主材轴力的贡献率以及台风风载荷作用下的脉动放大作用;并从主材受压稳定角度,对背风侧主材轴向压力值进行了校验,研究表明,考虑脉动风放大作用后,主材轴向压力远超过了设计值,并极有可能导致主材受压失稳而发生倒塔事故。
[Abstract]:The coastal areas of our country are often affected by severe weather, such as typhoons. As an important carrier of power transmission, the safe and reliable operation of overhead transmission lines plays a very important role in the development of coastal areas. However, overhead transmission lines have the characteristics of high flexibility, light weight and small damping, and have strong sensitivity to wind load. It is difficult to escape typhoon, which has caused huge losses to local economic construction and development. From the wind resistance design of the current transmission lines, for coastal transmission lines, most of them are based on the rule of full stress calculation, and for typhoon, which is a high intensity and high turbulence wind load, the equivalent static wind action is analyzed by using the method of magnifying factor. However, the strong pulsation caused by typhoon high turbulence is ignored. In order to study the dynamic response of transmission tower system under typhoon wind load, this paper studies the following aspects: firstly, YanMeng typhoon wind field is selected as the simulation model of typhoon mean wind, and relevant data are combined. The model parameters are determined to verify the adaptability of YanMeng typhoon wind field, and then the simulation circle method is used to combine the tropical cyclone data of Hainan Province in the past 50 years. The probabilistic and statistical analysis of the key parameters of tropical cyclone is carried out, and the extreme wind speed of Haikou City is calculated by using Monte Carlo simulation method and YanMeng typhoon wind field, and a method of calculating extreme wind speed based on tropical cyclone data is given. Secondly, this paper introduces the characteristics of typhoon pulsation wind, and takes the accident of inverted tower caused by 2014 "Weimasun" typhoon in Haikou City, Hainan Province, as the engineering background, and establishes a transmission tower system with one tower and two lines in ANSYS. The fluctuating wind speed of the transmission tower system engineering environment is simulated by the wind spectrum of Typhoon Shiyuan. Finally, the wind-induced dynamic response of transmission tower system under typhoon is analyzed in ANSYS. The wind load effect of transmission tower system under different wind load modes and the contribution rate of the corresponding line wind to the axial force of the main material and the pulsation amplification under the typhoon wind load are compared and studied, and from the point of view of the stability of the main material under compression, the wind load effect of the transmission tower system and the corresponding contribution rate of the line wind to the axial force of the main material are studied. The axial pressure of the main material on the leeward side is verified. The results show that the axial pressure of the main material exceeds the design value after considering the effect of pulsating wind amplification, and it is very likely that the collapse tower accident will occur due to the instability of the main material under compression.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75
本文编号：2279527
[Abstract]:The coastal areas of our country are often affected by severe weather, such as typhoons. As an important carrier of power transmission, the safe and reliable operation of overhead transmission lines plays a very important role in the development of coastal areas. However, overhead transmission lines have the characteristics of high flexibility, light weight and small damping, and have strong sensitivity to wind load. It is difficult to escape typhoon, which has caused huge losses to local economic construction and development. From the wind resistance design of the current transmission lines, for coastal transmission lines, most of them are based on the rule of full stress calculation, and for typhoon, which is a high intensity and high turbulence wind load, the equivalent static wind action is analyzed by using the method of magnifying factor. However, the strong pulsation caused by typhoon high turbulence is ignored. In order to study the dynamic response of transmission tower system under typhoon wind load, this paper studies the following aspects: firstly, YanMeng typhoon wind field is selected as the simulation model of typhoon mean wind, and relevant data are combined. The model parameters are determined to verify the adaptability of YanMeng typhoon wind field, and then the simulation circle method is used to combine the tropical cyclone data of Hainan Province in the past 50 years. The probabilistic and statistical analysis of the key parameters of tropical cyclone is carried out, and the extreme wind speed of Haikou City is calculated by using Monte Carlo simulation method and YanMeng typhoon wind field, and a method of calculating extreme wind speed based on tropical cyclone data is given. Secondly, this paper introduces the characteristics of typhoon pulsation wind, and takes the accident of inverted tower caused by 2014 "Weimasun" typhoon in Haikou City, Hainan Province, as the engineering background, and establishes a transmission tower system with one tower and two lines in ANSYS. The fluctuating wind speed of the transmission tower system engineering environment is simulated by the wind spectrum of Typhoon Shiyuan. Finally, the wind-induced dynamic response of transmission tower system under typhoon is analyzed in ANSYS. The wind load effect of transmission tower system under different wind load modes and the contribution rate of the corresponding line wind to the axial force of the main material and the pulsation amplification under the typhoon wind load are compared and studied, and from the point of view of the stability of the main material under compression, the wind load effect of the transmission tower system and the corresponding contribution rate of the line wind to the axial force of the main material are studied. The axial pressure of the main material on the leeward side is verified. The results show that the axial pressure of the main material exceeds the design value after considering the effect of pulsating wind amplification, and it is very likely that the collapse tower accident will occur due to the instability of the main material under compression.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75
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