架空线路动态增容等效换热稳态模型的误差分析及改进  

Error analysis and improvement method of equivalent heat transfer steady-state model for dynamic thermal rating of overhead conductors

作　　者：骆书剑 王锐 黄振 余欣 刘昭 彭瑞东 郭德明 刘刚[2] LUO Shu-jian;WANG Rui;HUANG Zhen;YU Xin;LIU Zhao;PENG Rui-dong;GUO De-ming;LIU Gang(Guangdong Key Laboratory of Electric Power Equipment Reliability,Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.,Guangzhou 510080,China;School of Electric Power Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]广东省电力装备可靠性企业重点实验室(广东电网有限责任公司电力科学研究院),广东广州510080 [2]华南理工大学电力学院,广东广州510640

出　　处：《电工电能新技术》2021年第11期72-80,共9页Advanced Technology of Electrical Engineering and Energy

基　　金：中国南方电网科技项目(GDKJXM20185588)。

摘　　要：随着电力需求的不断增长,充分挖掘现有输电线路输送能力的动态增容技术越来越重要。架空输电线路动态增容等效换热稳态模型具有既不需要测量环境风速、也不需要测量导线运行状态的优点。但是在实际应用中,由于铝球内热源和支撑部分结构的存在,试验铝球装置与模型中的理想单一铝球存在结构差异,造成铝球的热特性发生了改变。本文基于已提出的架空导线动态增容的等效换热稳态模型,首先采用有限元仿真的手段分析了在利用试验铝球装置情况下的模型误差;接着基于铝球热对流的理论计算公式,提出相应的模型改进方法;最后通过搭建风洞实验平台模拟试验铝球装置的运行,并结合IEEE标准的结果对改进的等效换热稳态模型进行验证,且相对误差不超过6%。因此,本文提出的改进等效换热稳态模型能够在工程实际应用中准确评估架空输电线路的载流量。With the continuous development of power demand,the dynamic thermal rating technology to maximize the transmission capacity of existing transmission lines is becoming more and more important.The equivalent heat transfer steady-state model for dynamic thermal rating of overhead transmission lines has the advantage that neither the wind speed nor the state of the conductors needs to be measured.However,in practical applications,there is a difference between the prototype aluminum ball device and the ideal single aluminum ball in the model,which inevitably causes the change of thermal behavior of the ground aluminum ball.This article bases on the given equivalent heat transfer steady-state theoretical model,firstly,the finite element simulation method is used to analyze the model bias in the case of the trial-produced aluminum ball device.Then based on the theoretical calculation formula of aluminum ball thermal convection,the corresponding model improvement method is proposed.Finally,by building a wind tunnel experiment platform to simulate the operation of the trial-produced aluminum ball device and combining the results of the IEEE standard to verify the improved equivalent heat transfer steady-state model,the relative error does not exceed 6%.Therefore,the improved equivalent heat transfer steady-state model proposed can accurately evaluate the current carrying capacity of overhead transmission lines in practical engineering applications.

关 键 词：动态增容 误差分析 改进方法 架空输电线路 等效换热稳态模型 

分 类 号：TM751[电气工程—电力系统及自动化]