基于直流滤波器多频率单端电气量的高压直流线路保护  

HVDC Line Protection Based on DC Filter Multifrequency Single-end Electric Parameters

作　　者：戴志辉[1] 赵中秋 王兴国 郭雅蓉 秦昊宇 邱宏逸 DAI Zhihui;ZHAO Zhongqiu;WANG Xingguo;GUO Yarong;QIN Haoyu;QIU Hongyi(Department of Electrical Engineering,North China Electric Power University,Baoding 071003,China;China Electric Power Research Institute,Beijing 100192,China)

机构地区：[1]华北电力大学电力工程系,保定071003 [2]中国电力科学研究院有限公司,北京100192

出　　处：《高电压技术》2023年第2期702-712,共11页High Voltage Engineering

基　　金：国家自然科学基金(51877084);中国电力科学研究院有限公司科技项目(JBB51202102780)。

摘　　要：针对传统高压直流输电线路保护耐受过渡电阻能力有限、保护速动性不足的问题,提出一种基于线路边界元件的多频率单端电气量保护方案。首先基于附加网络分析了不同频率下电气故障分量幅值比的特征,得到在区内、外故障情况下,线路单侧边界测点处特定高频电气量幅值比的差异。据此,利用多个特定频率电气故障分量的比值构造判据,准确有效地识别线路内部故障与整流侧和逆变侧区外故障。理论分析与仿真验证表明,该保护方案原理简单、计算量小,仅通过单端电气量即可准确识别区内、外故障,在保证良好耐受过渡电阻能力基础上能够可靠且快速保护线路全长。To address the issues of limited withstand transition resistance and insufficient protection speed of traditional HVDC transmission line protection, a multi-frequency single-ended protection scheme based on line boundary elements is proposed. Firstly, based on the superimposed network, the characteristics of the amplitude ratio of electrical fault components at different frequencies are analyzed. It is obtained that, in the case of internal and external faults, the amplitude ratio of specific high-frequency electrical quantities at the boundary measuring points on one side of the line is different.Based on this, the ratio of multiple specific-frequency electrical fault components is used to construct a criterion to accurately and effectively distinguish internal faults from external faults at the rectifier and inverter sides. Theoretical analysis and simulation verification show that the protection scheme has the advantages of simple principle and small amount of calculation. Internal and external faults can be accurately identified only based on single-terminal electrical quantities. On the basis of ensuring good tolerance to transition resistance, the whole length of the line can be reliably and quickly protected.

关 键 词：高压直流 单端保护 线路保护 边界元件 故障分量 高频暂态 

分 类 号：TM773[电气工程—电力系统及自动化] TM721.1