基于电场逆运算的输电导线弧垂计算方法  

Novel Algorithm for Transmission Line Sag Calculation Based on Electrical Field Invert Arithmetic

作　　者：陈楠[1] 文习山[1] 蓝磊[1] 黄玲[2] 王羽[1] 杜华珠[1] 李晔 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072 [2]中南电力设计院,湖北省武汉市430071 [3]宁夏电力科学研究院,宁夏回族自治区银川市750002

出　　处：《中国电机工程学报》2011年第16期121-127,共7页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2009CB724500)~~

摘　　要：输电导线弧垂是导线运行的重要参数,影响电网的安全稳定运行。为实现导线弧垂的准确监测,提出基于导线工频电场(power frequency electrical field,PFEF)逆运算的弧垂计算方法。首先根据悬链线方程,基于有限长线电荷建立导线工频电场的三维计算模型。然后根据导线下方工频电场的实时测量数据,在三维电场模型下利用遗传算法(geneticalgorithm,GA)反演得到导线的最大弧垂。考虑电场测量数据受外界环境因素和测量条件的影响,采用最小二乘支持向量机(least squares support vector machine,LS-SVM)建立导线原始测量数据的环境因素修正模型,使修正后的测量数据逼近理想条件下的数据。将修正后的电场测量值作为反演模型的目标参考值,进一步提高弧垂的计算精度。对比银川地区某条典型输电导线的测量数据,验证了该算法的有效性。The sag of transmission line, which influences the security and stability of power grid operation, is an important parameter in power systems. In order to monitor the sag of transmission line accurately, a novel calculation method for line sag based on power frequency electrical field （PFEF） inverse algorithm was presented. At first, a three-dimensional PFEF calculation model was established according to the finite slant charge method, in which the transmission line was expressed with the catenary equation. Then, according to the PFEF measured under the transmission line, the line sag was inverted with the help of genetic algorithm （GA） under the PFEF positive-going arithmetic model presented. Considering the impact of weather and survey condition for the measured data, a revised model based on least squares support vector machine （LS-SVM） was set up. With this model, the effect of outer factor to the measured data was reduced, and the modified measured data approached the ideal value. Since the revised measured data were used as the reference target values for the inverse algorithm, the calculation precision of sag was further improved. In the end, the effectiveness of the proposed algorithm was validated with the test of a typical transmission line in Yinchuan region.

关 键 词：输电导线 工频电场 弧垂 最小二乘支持向量机 遗传算法 

分 类 号：TM75[电气工程—电力系统及自动化]