高压架空导线径向热路模型及其参数计算方法  

Radial Thermal Circuit Model and Parameter Calculation Method for High Voltage Overhead Transmission Line

作　　者：应展烽[1] 杜志佳[2] 冯凯[1] 柳亚芳[1] 吴军基[1] 

机构地区：[1]南京理工大学能源与动力工程学院,南京210094 [2]国家电网南京供电公司,南京210019

出　　处：《电工技术学报》2016年第4期13-21,共9页Transactions of China Electrotechnical Society

基　　金：江苏省电力公司创新科技项目资助(2011LY226090425)

摘　　要：为计算不同载流时的高压架空导线径向温度,利用径向热平衡原理,提出了基于状态方程形式的径向温度热路模型。根据几何分析,提出了径向环状截面内导线的热功率及热容计算方法。通过线性回归方法,对模型中不同截面内导线的径向热阻进行了灰箱辨识。为验证模型准确度,设计了径向温度梯度测量的实验平台,在实验室内对加载不同电流情况下的导线径向温度进行了实测。通过Simulink对径向热路模型进行了仿真,仿真与实验结果的对比表明,自然对流条件下,热路模型平均误差小于3.16%,能够用于计算不同电流时的导线径向温度梯度。To calculate current-radial temperature of high voltage overhead transmission line, a radial temperature thermal circuit model in the form of state equation was developed with the thermal equilibrium principle. A calculation method was proposed to estimate the heat flux and heat capacity of conductor on the transmission line radial annular cross section. With linear regression method, the radial thermal resistance of thermal circuit model was obtained by grey box identification. To validate the reliability of model, an experiment was designed to measure the radial temperatures of transmission line with various current. A simulation with thermal circuit model was performed to calculate the radial temperature by Simulink. Comparing the experiment and simulation, the average relative error of proposed thermal circuit model is less than 3.16% in natural convection. The results indicate that the proposed thermal circuit model has potential application applied in radial temperature gradient calculation of transmission line with various current.

关 键 词：高压架空导线 热路模型 径向温度梯度 灰箱辨识 

分 类 号：TM751[电气工程—电力系统及自动化]