高压架空导线径向热路模型及其参数计算方法

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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。

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	应展烽
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关键词 ：高压架空导线, 热路模型, 径向温度梯度, 灰箱辨识

Abstract：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.

Key words： High voltage overhead transmission line thermal circuit model radial temperature gradient grey box identification

出版日期: 2016-03-03

PACS:

TM751

作者简介: 杜志佳男,1986年生,硕士研究生,研究方向为高压架空输电线路状态监测技术。E-mail: Duzhijia@163.com

引用本文:

应展烽, 杜志佳, 冯凯, 柳亚芳, 吴军基. 高压架空导线径向热路模型及其参数计算方法[J]. 电工技术学报, 2016, 31(4): 13-21. Ying Zhanfeng, Du Zhijia, Feng Kai, Liu Yafang, Wu Junji. Radial Thermal Circuit Model and Parameter Calculation Method for High Voltage Overhead Transmission Line. Transactions of China Electrotechnical Society, 2016, 31(4): 13-21.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I4/13

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