文章摘要
张艳霞,王海东,李婷,等.LCC-VSC混合直流输电线路的组合型单端故障定位方法[J].电力系统自动化. DOI: 10.7500/AEPS20181121006.
ZHANG Yanxia,WANG Haidong,LI Ting, et al.Combined Single-end Fault Location Method for Transmission Line of LCC-VSC Hybrid High Voltage Direct Current[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20181121006.
LCC-VSC混合直流输电线路的组合型单端故障定位方法
Combined Single-end Fault Location Method for Transmission Line of LCC-VSC Hybrid High Voltage Direct Current
DOI:10.7500/AEPS20181121006
关键词: LCC-VSC  混合直流输电  单端行波故障定位  固有频率  波头识别
KeyWords: LCC-VSC  hybrid HVDC transmission  single-ended traveling wave fault location  natural frequency  wave head recognition
上网日期:2019-08-13
基金项目:
作者单位E-mail
张艳霞 天津大学电气自动化与信息工程学院 zyx1962@tju.edu.cn 
王海东 天津大学电气自动化与信息工程学院 hdwang@tju.edu.cn 
李婷 天津大学电气自动化与信息工程学院 1031084838@163.com 
林志海 天津大学电气自动化与信息工程学院 zhlin0905@163.com 
常雨晴 天津大学电气自动化与信息工程学院 changyuqing0617@163.com 
摘要:
      LCC-VSC混合直流输电线路中的故障行波传播特性有别于常规直流和柔性直流的输电线路。本文针对混合直流输电线路分析了行波折反射过程及两端边界反射角的频变特性,确定了单端法故障定位装置的合理安装侧,提出了一种组合型单端故障定位新原理。先利用定位精度略低的固有频率法进行故障位置初测,以此粗略计算故障点第一次反射波的大致到达时刻;再利用故障点反射波与对端母线反射波的波到时刻的对称性质在行波传播时序图中匹配找到这两种反射波的精准波到时刻;最后根据初始行波、故障点第一次反射波和对端母线第一次反射波波到时刻实现故障定位。仿真实验表明,固有频率法的引入有效避免了由于无法准确区分故障点第一次反射波与对端母线第一次反射波所带来的定位误差,在LCC-VSC混合直流输电线路中能实现较准确的故障定位。
Abstract:
      The propagation characteristics of the fault traveling wave on LCC-VSC HVDC transmission line are different from those on LCC-HVDC or VSC-HVDC transmission lines. Aiming at LCC-VSC HVDC transmission line, this paper analyzes the propagation process of fault traveling wave and the frequency-variation characteristic of the reflection angles at both boundaries of lines, determines the reasonable installation side for the single-end fault location device, and proposes a novel combined single-end fault location principle. Firstly, the natural frequency fault location method whose accuracy is slightly lower is utilized to roughly locate the fault point and obtain approximate arriving time of the first reflected wave from the fault point. Then, based on the symmetry between the arriving times of the reflected wave head from the fault point and that from the opposite bus of line, the precise arrival times of these two reflected waves are found by matching in traveling wave propagation sequence diagram. Finally, the fault point is accurately located with the arriving times of the initial traveling wave, the first reflected wave from the fault point and that from the opposite bus of line. The simulation results show that the introduction of the natural frequency method effectively avoids the location error caused by the inaccurate discrimination between the first reflection wave from the fault point and that from the opposite bus of line, and the proposed method can accurately locate the fault point on the transmission lines of the LCC-VSC HVDC system.
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