基于线性回归的架空导线热路模型集总参数辨识  

Lumped parameter identification of overhead line thermal circuit model based on linear regression

作　　者：柳亚芳[1] 应展烽[1] 张旭东[1] 冯凯[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,江苏南京210094

出　　处：《南京理工大学学报》2015年第3期335-341,共7页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(51405235);江苏省产学研联合创新资金(BY2013038);江苏省电力公司科技项目(2011LY226090424);连云港市产学研联合研究项目(CXY1216)

摘　　要：为提高架空导线热路模型计算精度,设计了架空导线温升实验平台。在自然对流条件下,对不同载流时LGJ-240和LJG-400导线的热动态过程进行了实测。提出了基于线性回归分析的架空导线热路模型集总参数辨识方法,建立了热路参数与电流之间的函数关系。辨识结果表明:架空导线等效热阻与传统计算值较为接近,且随着电流的增加呈减小趋势;等效热容与传统计算值差异明显,不随电流单调变化,更具随机性;利用辨识方法得到的热容和热阻求解架空导线热路模型响应,误差小于1.28%,精度明显高于传统方法。To improve the accuracy of an overhead line thermal circuit model,a temperature rise experimental platform of overhead lines is designed. The thermal dynamic processes of LGJ-240 /30 and LGJ-400 /35 with different current-carrying are measured under natural convection conditions. A linear regression method is proposed to identify the lumped parameter of the overhead line thermal circuit model. A function is established to calculate the overhead line thermal circuit model parameters by current. The identification results show that the identified values of thermal resistance are close to those of the traditional method,and decrease with the increase of current; the identified values ofthermal capacity are different from those of the traditional method,and show no trend with the increase of current; the identified thermal resistance and thermal capacity are used to solve the overhead line thermal circuit model,and the maximum relative error of model responses is less than1. 28%,and the accuracy of the proposed method is much better than that of the traditional method.

关 键 词：线性回归 架空导线 热路模型 温升实验平台 热动态过程 热阻 热容 

分 类 号：TM244.2[一般工业技术—材料科学与工程]