同塔双回直流输电线路行波时域计算方法

doi:10.19595/j.cnki.1000-6753.tces.161854

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摘要同塔双回直流输电线路作为不平衡线路,行波在传播过程及端口折反射所涉及的频变特性是其故障行波精确计算中需要解决的关键问题。为此,提出了一种适用于同塔双回直流输电线路的暂态行波时域计算方法。该方法利用矢量拟合法和叠加定理,将故障行波在直流线路端口的折反射特性等效为时序波矩阵形式,并利用时域阶跃响应矩阵计及故障行波在直流线路上传播时的频变特性,从而避免了复杂的时频域转换过程。基于PSCAD/EMTDC对实际同塔双回直流线路的仿真测试验证了所提算法的有效性和准确性。

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	李海锋
	武霁阳
	梁远升
	张坤
	王钢

关键词 ：行波计算, 频变特性, 同塔双回直流线路, 矢量拟合法

Abstract：The double-circuit transmission line with shared towers is not balanced. Thus the frequency-dependent characteristic of traveling wave propagation, refraction and reflection are the key issue of its travelling-wave calculation. A time-domain calculation method of travelling-wave on double-circuit HVDC transmission line is proposed. Based on the vector fitting method and superposition theorem, the characteristics of refraction and reflection of fault generated travelling wave at the end of DC line are equivalent to the matrix of sequential wave impedance. Meanwhile, a time-domain step response matrix is used to calculate the frequency-dependent characteristics in the propagation process of travelling wave, which would avoid the complicated time-frequency conversion. Finally the PSCAD/EMTDC simulation model of a real double-circuit HVDC transmission lines with shared towers was constructed and extensive simulation results verify the validity and accuracy of the proposed method.

Key words： Travelling wave calculation frequency-dependent characteristics double-circuit HVDC transmission line with shared towers vector fitting

收稿日期: 2016-11-25 出版日期: 2018-02-26

PACS:

TM773

基金资助:国家自然科学基金项目（51577072）和直流输电设备状态评估与故障诊断实验室开放基金项目资助

通讯作者: 李海锋男,1976年生,博士,副教授,研究方向为电力系统故障分析与继电保护。E-mail：lihf@scut.edu.cn

作者简介: 武霁阳男,1987年生,博士,工程师,研究方向为高压直流输电系统控制保护。E-mail：wujy0451@163.com

引用本文:

李海锋, 武霁阳, 梁远升, 张坤, 王钢. 同塔双回直流输电线路行波时域计算方法[J]. 电工技术学报, 2018, 33(3): 573-580. Li Haifeng, Wu Jiyang, Liang Yuansheng, Zhang Kun, Wang Gang. A Time-Domain Calculation Method of Travelling-Wave on Double-Circuit HVDC Transmission Line with Shared Towers. Transactions of China Electrotechnical Society, 2018, 33(3): 573-580.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.161854 https://dgjsxb.ces-transaction.com/CN/Y2018/V33/I3/573

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