高次谐波下干式空心平波电抗器绕组的电位分布规律研究  

Potential distribution law of dry-type air-core smoothing reactor winding under high-order harmonics

作　　者：周秀 白金 李宁 田天 陈磊 雷佳成 杨泰 杨鑫[3] ZHOU Xiu;BAI Jin;LI Ning;TIAN Tian;CHEN Lei;LEI Jiacheng;YANG Tai;YANG Xin(Electric Power Science Research Institute,State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan 750011,China;Ultra High Voltage Company,State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan 750011,China;School of Electrical&Information Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]国网宁夏电力有限公司电力科学研究院,宁夏银川750011 [2]国网宁夏电力有限公司超高压公司,宁夏银川750011 [3]长沙理工大学电气与信息工程学院,湖南长沙410114

出　　处：《电力科学与技术学报》2024年第6期269-276,共8页Journal of Electric Power Science And Technology

基　　金：国网宁夏电力有限公司科技项目(5229DK220008)。

摘　　要：在高次谐波作用下,干式空心平波电抗器的多层并联绕组的电位分布会形成异常畸变,导致局部场强集中与电老化加剧,影响电抗器使用寿命。为解决此问题,基于傅里叶分析,得到平波电抗器运行工况中承载的高次谐波特征;建立以线匝为基本单元的电抗器物理模型,通过场-路耦合的有限元分析方法研究干式空心平波电抗器绕组在高次谐波以及与直流叠加作用下的电位分布规律。研究结果表明:相较于在直流情况下,高次谐波的载入会使得电抗器绕组电场分布不均,电抗器整体电场最强点的场强增加15%;在高次谐波的影响下,电抗器单层绕组上、下两端的匝间场强差增大,包封内两侧绕组的层间场强增大;最外层绕组电场最大值比最内层绕组电场最大值增大了约20%;干式空心平波电抗器的最外层包封最易发生电老化。Under the action of high-order harmonics,the potential distribution of the multi-layer parallel winding of the dry-type air-core smoothing reactor will form abnormal distortion,resulting in local field strength concentration and accelerated electrical aging,which will affect the service life of the reactor.To solve this problem,firstly,based on Fourier analysis,the high-order harmonic characteristics of a smoothing reactor under operating conditions are obtained.Then,the physical model of the reactor with the line turn as the basic unit is established,and the potential distribution law of the dry-type air-core smoothing reactor winding under high-order harmonics and direct current(DC)superposition is studied by the finite element analysis method of field-circuit coupling.The results show that compared with the DC case,the loading of high-order harmonics will make the electric field distribution of the reactor winding uneven,and the field strength of the strongest point in the overall electric field of the reactor increases by 15%.Under the influence of high-order harmonics,the inter-turn field strength difference between the upper and lower ends of the single-layer winding of the reactor increases,and the inter-layer field strength of the windings on both sides of the encapsulation increases.The maximum electric field of the outermost winding is about 20%higher than that of the innermost winding.As a result,the outermost encapsulation of the dry-type air-core smoothing reactor is the most prone to electrical aging.

关 键 词：高次谐波 干式空心平波电抗器 场-路耦合 电位分布 

分 类 号：TM47[电气工程—电器]