柔性直流架空线路差模波特征优化方法  

Optimization method for differential mode wave characteristics of flexible direct current overhead lines

作　　者：姜崇学 焦鑫艳[1] 王佳成[1] 唐俊[1] 史艳刚 JIANG Chongxue;JIAO Xinyan;WANG Jiacheng;TANG Jun;SHI Yan’gang(NR Electric Co.,Ltd,Nanjing 211102)

机构地区：[1]南京南瑞继保电气有限公司,南京211102

出　　处：《电气技术》2024年第5期70-74,80,共6页Electrical Engineering

基　　金：国家电网公司总部科技项目(5100-202256001A-1-1-ZN)。

摘　　要：随着柔性直流输电系统向高电压、大容量方向发展,采用架空线路成为工程选择的必然趋势。本文基于工程化应用场景,结合行波模型和计算量,运用离散小波变换和多分辨率解析方法分别对差模行波、直流电流、直流电压等电气量进行处理,得到其特征值,在远端区内故障和远端区外故障时对比三者的差异。针对差模行波特征值,对远端区内经过渡电阻的故障工况进行测试。结果表明,本文所述计算方法具有较好的选择性和灵敏性,且计算量小,能够满足实际工程需求。With the development of flexible DC transmission systems towards high voltage and large capacity,the use of overhead lines has become an inevitable direction for engineering selection.This article is based on engineering application scenarios,combined with traveling wave models and computational complexity,using discrete wavelet transform and multi resolution analysis methods to process electrical quantities such as differential mode traveling wave,DC current and DC voltage,and obtain their respective eigenvalues.The differences between the three are compared and analyzed for faults in the remote area and faults outside the remote area.And for the differential mode traveling wave eigenvalues,the fault condition through transition resistance in the remote region is tested.The results show that the calculation method described in the article has good selectivity and sensitivity for differential mode traveling wave transformation,and the computational complexity is small,which can meet the practical needs of engineering.

关 键 词：柔性直流 架空线 行波保护 小波变换 

分 类 号：TM75[电气工程—电力系统及自动化] TM721.1