摘要
覆冰是影响电网安全运行的最主要威胁之一。输电线路覆冰在线监测是防治电网覆冰灾害的有效手段,其中称重法获得广泛应用。我国地形复杂多变,特殊地形对输电线路受力有较大影响。为了分析输电线路覆冰在线监测中直线塔输电线路等值覆冰厚度计算模型在常见输电线路纵断面模型下的有效性,文章采用有限元法建立输电线路力学仿真模型,研究输电线路过谷模型、翻山模型以及连续上(下)山模型下输电线路等值覆冰厚度计算结果的准确性,提出考虑等效长度变化的直线塔输电线路等值覆冰厚度计算模型。结果表明,在均匀覆冰下,对于输电线路过谷模型,当杆塔高差系数绝对值不超过0.2时,等值覆冰厚度计算结果与假设值相对误差在16%以内;然而当杆塔高差系数较大时,如杆塔高差系数为–0.3,等值覆冰厚度计算结果与假设值相对误差大于40%。将等值覆冰厚度计算模型改进后,等值覆冰厚度计算结果与假设值相对误差变小,且覆冰厚度越大,相对误差越小。对于输电线路翻山模型和连续上(下)山模型,等值覆冰厚度计算厚度结果相对误差不超过5%。
Icing is one of the main threat affecting the safe operation of power grids.On-line icing-monitoring of transmission lines is an effective means to prevent icing disasters of power grids,and the weighing method is widely used in domestic power grids.The terrain in China is complex and changeable,and the special terrain has great influence on the force of transmission lines.In order to analyse the validity of the calculation model of equivalent icing thickness of the tangent tower in the on-line icing-monitoring of transmission lines under common longitudinal section models,the finite element method is used to establish the mechanical simulation model of transmission lines.The accuracy of the calculation results of equivalent icing thickness under the“across the valley”model,the“mountain climbing”model and the“continuous uphill(downhill)”model of transmission lines is studied,and the paper puts forward the calculation model of equivalent icing thickness of tangent tower considering the change of equivalent length.The result shows that under uniform icing,for the“across the valley”model of transmission lines,when the absolute value of height difference coefficient of tower is not more than 0.2,the relative error between the calculation result of equivalent icing thickness and the supposed value is less than 16%.However,when the absolute value of height difference coefficient of tower is large,such as equals to–0.3,the relative error between the calculation result of equivalent icing thickness and the supposed value is greater than 40%.After improving the calculation model of equivalent icing thickness,the relative error between the calculation result of equivalent icing thickness and the supposed value becomes smaller,moreover,the larger the icing thickness,the smaller the relative error.For the“mountain climbing”model and the“continuous uphill(downhill)”model of transmission lines,the relative error of the calculation result of equivalent icing thickness is less than 5%.
作者
郝艳捧
魏发生
王斌
阳林
王俊锞
黄增浩
李昊
HAO Yanpeng;WEI Fasheng;WANG Bin;YANG Lin;WANG Junke;HUANG Zenghao;LI Hao(School of Electric Power,South China University of Technology,Guangzhou 510640,Guangdong Province,China;CSG Electric Power Research Institute Co.,Ltd.,Guangzhou 510663,Guangdong Province,China)
出处
《电网技术》
EI
CSCD
北大核心
2022年第7期2786-2793,共8页
Power System Technology
基金
南方电网有限责任公司防冰减灾重点实验室支撑项目(GZKJXM20191287)
广东省基础与应用基础研究基金项目(2019A1515012122)。
关键词
输电线路
覆冰
在线监测
直线塔
特殊地形
有限元法
transmission lines
icing
on-line monitoring
tangent tower
special terrain
finite element method
作者简介
郝艳捧(1974),女,教授,博士生导师,研究方向为输电设备状态感知技术,污秽、覆冰、雷电下输变电设备外绝缘安全,介质阻挡放电、沿面放电、局部放电等气体放电理论研究,E-mail:yphao@scut.edu.cn;魏发生(1996),男,硕士研究生,研究方向为输电线路覆冰在线监测,E-mail:epwfs@mail.scut.edu.cn;王斌(1996),男,硕士研究生,研究方向为输电线路覆冰在线监测,E-mail:201921014732@mail.scut.edu.cn;通信作者:阳林(1984),男,副教授,博士生导师,从事输变电设备外绝缘等研究,E-mail:eplyang@scut.edu.cn。
