中国电力 ›› 2021, Vol. 54 ›› Issue (1): 37-46.DOI: 10.11930/j.issn.1004-9649.202003179

• 国家“十三五”智能电网重大专项专栏:(四)柔性直流电网技术、装备与工程 • 上一篇    下一篇

一种基于三端直流输电系统的架空线路谐波电流计算方法

崔嘉滢, 刘天琪, 王顺亮, 马俊鹏, 常鹏飞   

  1. 四川大学 电气工程学院,四川 成都 610065
  • 收稿日期:2020-03-25 修回日期:2020-06-28 出版日期:2021-01-05 发布日期:2021-01-11
  • 作者简介:崔嘉滢(1994—),女,硕士研究生,从事电力系统分析计算及稳定控制、高压直流输电研究,E-mail:cuijiaying17@163.com;刘天琪(1962—),女,博士,教授,博士生导师,从事电力系统分析计算与稳定控制、高压直流输电、调度自动化、新能源接入、大数据应用研究,E-mail:tqliu@seu.edu.cn;王顺亮(1987—),男,通信作者,博士,副研究员,从事高压直流输电、变流器控制与调制研究,E-mail:SLW_SCV@163.com;马俊鹏(1990—),男,博士,副研究员,从事高压直流输电系统建模及分析、新能源并网变换器建模及控制研究,E-mail:jma@scu.edu.cn;常鹏飞(1995—),男,硕士研究生,从事电力系统分析计算及稳定控制、高压直流输电研究,E-mail:174270452@qq.com
  • 基金资助:
    国家自然科学基金资助项目(51977135)

A Calculation Method for Line Harmonic Current Based on Three-Terminal HVDC Transmission System

CUI Jiaying, LIU Tianqi, WANG Shunliang, MA Junpeng, CHANG Pengfei   

  1. College of Electrical Engineering, Sichuan University, Chengdu 610065, China
  • Received:2020-03-25 Revised:2020-06-28 Online:2021-01-05 Published:2021-01-11
  • Supported by:
    This work is supported by National Natural Science Foundation of China (No.51977135)

摘要: 针对三端直流输电系统可能出现的架空输电线路谐波电流放大问题,对不同运行方式下的双极线路谐波电流开展研究。基于波阻抗理论,将对称运行的直流线路简化为对称分量回路,并求取单位长度参数;分析了均一线路谐波电流的计算方法;在此基础上结合波的折反射原理,提出了一种计算混合线路谐波电流的方法。通过在PSCAD/EMTDC平台上搭建相应的直流线路模型进行仿真,并与理论计算结果对比,表明该计算方法在求取三端直流输电系统不同运行方式下的线路谐波电流方面具有较高的准确性。

关键词: 三端直流输电系统, 分布参数, 波阻抗, 谐波电流, 运行方式, 混合线路

Abstract: In view of the potential problem of harmonic current amplification of overhead transmission lines in three-terminal DC transmission system, a study is conducted on the harmonic current of bipolar overhead lines under different operating modes. Based on the theory of wave impedance, the symmetrical DC lines are simplified into the symmetrical component loops, and the unit length parameters are obtained. The calculation method for harmonic current of uniform line is analyzed. Based on the theory of wave refraction and reflection, a method for calculating harmonic current of hybrid transmission lines is proposed. By building the corresponding DC line model on the PSCAD/EMTDC platform for simulation, and comparing with the theoretical calculation results, it is shown that the proposed calculation method has a high accuracy in obtaining the line harmonic current under different operation modes of the three-terminal DC transmission system.

Key words: three-terminal DC transmission system, distributed parameter, wave impedance, harmonic current, operating mode, hybrid transmission lines