基于分布参数的直流线路谐波电流放大特性  

Harmonic Current Amplification Characteristics of HVDC Lines Based on Distributed Parameters

作　　者：常天宇 王顺亮[1] 张英敏[1] 马俊鹏 张雨晗 刘天琪[1] CHANG Tianyu;WANG Shunliang;ZHANG Yingmin;MA Junpeng;ZHANG Yuhan;LIU Tianqi(College of Electrical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学电气工程学院,成都610065

出　　处：《高电压技术》2023年第11期4654-4664,共11页High Voltage Engineering

基　　金：国家自然科学基金(51977135)。

摘　　要：针对双极高压直流线路中存在的谐波电流放大问题,在分析线路分布参数的基础上,提出了一种直流线路谐波电流传递系数的定量计算方法,可用于评估谐波电流的放大水平。首先,从多导体线路的耦合关系及双极线路结构出发,建立了架空线路的谐波阻抗模型;其次,推导了线路谐波电流传递的解析式,并据此深入分析了谐波传递放大的主要影响因素;然后,基于均匀传输线的波过程,揭示了谐波电流的传递规律;最后,结合某直流输电工程的技术参数,在采用非均匀线路送电的三端运行方式下,在PSCAD仿真平台中验证了所提出的线路谐波电流计算方法的准确性。Aiming at the problem of harmonic current amplification in bipolar HVDC transmission lines,we propose a quantitative calculation method of harmonic current transfer coefficient of HVDC line on the basis of analyzing the distribution parameters of lines,which can be used to evaluate the amplification level of harmonic current.Firstly,based on the coupling relationship of multi-conductor lines and the structure of bipolar overhead lines,the harmonic impedance model of overhead line is established.Secondly,the analytical formula of the harmonic current transfer is obtained and the main influence factors of harmonic amplification is analyzed.Then,based on the wave propagation of the transmission line,the transmission regularities of harmonic currents are explored.Finally,combined with the parameters of a HVDC transmission project,under the three-terminal operation mode with non-uniform lines,the accuracy of the proposed harmonic current calculation method is verified in the PSCAD simulation platform.

关 键 词：高压直流架空线路 分布参数 谐波电流放大 传递规律 影响因素 计算方法 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM75