摘要
基于传统柔性直流输电线路行波保护存在耐过渡电阻能力不足,保护整定缺乏依据的问题。该文首先分析区内、外故障保护安装处首行波频率分量的衰减特征,揭示区内故障首行波频率分量衰减规律,区内、外故障首行波频率分量衰减差异性。然后,深入分析保护安装处故障首行波解析式,增强高频分量在能量计算中的影响,构造出能够反映故障位置和线路边界衰减特性的首行波主频分量。首行波主频分量解析式表明主频分量随故障距离增加而减小,区内、外故障首行波主频分量存在显著差异。在此基础上,提出一种基于首行波主频分量衰减特征的单端量行波保护方法,该方法充分利用了首行波全频段信息,原理上不受过渡电阻的影响且主频分量解析式也为保护阈值整定提供了理论依据。仿真结果表明所提保护方案能够快速准确识别区内、外故障,首行波主频分量能有效反映故障位置,整定简单易行,耐过渡电阻能力较强,在不同网络拓扑结构下具有较强的适应性。
Based on the traditional flexible DC transmission line traveling wave protection,there are problems of insufficient resistance to transition resistance and lack of basis for protection setting.This paper firstly analyzes the attenuation characteristics of the initial traveling wave frequency components of fault protection installations inside and outside the area,and reveals the attenuation law of the initial traveling wave frequency components of faults in the area and the difference between the initial traveling wave frequency components attenuation of the faults inside and outside the area.Then,the initial traveling wave analytical formula of the fault at the protection installation is deeply analyzed,the influence of the high frequency component in the energy calculation is enhanced,and the main frequency component of the initial traveling wave that can reflect the fault location and the attenuation characteristics of the line boundary is constructed.The analytical formula of the main frequency component of the initial traveling wave shows that the main frequency component decreases with the increase of the fault distance,and there is a significant difference between the main frequency component of the initial traveling wave inside and outside the fault.On this basis,a single-ended traveling wave protection method based on the attenuation characteristics of the initial traveling wave main frequency component is proposed.This method makes full use of the full frequency band information of the initial traveling wave.The component analytical formula also provides a theoretical basis for the protection threshold setting.The simulation results show that the protection scheme proposed in this paper can quickly and accurately identify the internal and external faults,the main frequency component of the initial traveling wave can effectively reflect the fault location,the setting is simple and easy,the ability to withstand transition resistance is strong,and it has better performance under different network topologies with Strong adaptability.
作者
邓丰
张振
钟航
曾哲
冯思旭
曾祥君
潘一彬
DENG Feng;ZHANG Zhen;ZHONG Hang;ZENG Zhe;FENG Sixu;ZENG Xiangjun;PAN Yibin(College of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,Hunan Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2023年第15期5797-5807,共11页
Proceedings of the CSEE
基金
国家自然科学基金项目(52077008)。
关键词
柔性直流输电
行波衰减特征
主频分量
过渡电阻
单端量保护
flexible DC transmission
traveling wave attenuation characteristics
main frequency component
transition resistance
single-ended protection
