| 引用本文: | 孙 广,王 阳,薛 枫,等.特高压直流输电线路改进双端行波故障定位方法研究[J].电力系统保护与控制,2020,48(14):113-120.[点击复制] |
| SUN Guang,WANG Yang,XUE Feng,et al.Research on an improved double-terminal traveling wave fault location method for UHVDC project[J].Power System Protection and Control,2020,48(14):113-120[点击复制] |
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| 特高压直流输电线路改进双端行波故障定位方法研究 |
| 孙广,王阳,薛枫,李猛克,董金星,梁伟,乐健 |
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| (1.国网内蒙古东部电力有限公司检修分公司，内蒙古 通辽 028000;
2.武汉大学电气与自动化学院，湖北 武汉 430072;
2.武汉大学电气与自动化学院，湖北 武汉 430073;
2.武汉大学电气与自动化学院，湖北 武汉 430074;
2.武汉大学电气与自动化学院，湖北 武汉 430075;
2.武汉大学电气与自动化学院，湖北 武汉 430076;
2.武汉大学电气与自动化学院，湖北 武汉 430077;
2.武汉大学电气与自动化学院，湖北 武汉 430078) |
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| 摘要: |
| 实现特高压直流输电系统线路故障的准确定位对于提高故障处理效率、确保直流输电系统运行可靠性等均具有重要现实意义。设计了基于改进D型双端行波法的直流输电线路故障定位策略。首先采用导数法对故障发生的时刻范围进行准确判断，进而通过小波模极大值分析确定行波到达线路双端的准确时刻。利用故障行波波头到达测量端的第一次和第二次时刻，设计了改进D型双端行波测距方法，消除了行波波速对故障测距的影响。仿真算例结果表明故障测距结果误差较小，说明改进D型双端行波法具有较高的故障测距精度，同时对不同类型故障和不同过渡电阻具有良好的适应性，也能应用于近区故障定位。 |
| 关键词: 特高压直流输电系统 线路故障定位 双端行波法 小波分析 行波波速 |
| DOI：10.19783/j.cnki.pspc.191050 |
| 投稿时间：2019-08-29修订日期：2019-12-25 |
| 基金项目:国家自然科学基金项目资助(51477120) |
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| Research on an improved double-terminal traveling wave fault location method for UHVDC project |
| SUN Guang,WANG Yang,XUE Feng,LI Mengke,DONG Jinxing,LIANG Wei,LE Jian |
| (1. State Grid East Inner Mongolia Electric Power Maintenance Company, Tongliao 028000, China;
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China) |
| Abstract: |
| Accurate transmission line fault location is of great practical significance for improving the efficiency of fault treatment and guaranteeing the reliability of a UHVDC system. A fault location strategy for a DC transmission line based on an improved D-type twin-terminal traveling wave method is designed. First, the derivative method is adopted to accurately judge the range of fault occurrence time. Then, the exact time when the traveling wave reaches both ends of the line is determined by wavelet modulus maximum analysis. Based on the first and second moments when the fault traveling wave reaches the measuring end, an improved D-type two-terminal traveling wave ranging method is designed. It eliminates the influence of traveling wave velocity on fault ranging. The simulation results show that the error of fault ranging is small. It indicates that the improved D-type two-terminal traveling wave method has higher fault location accuracy. At the same time, it has good adaptability to different types of faults and different transition resistances, and can also be applied to the location of near-area faults.
This work is supported by National Natural Science Foundation of China (No. 51477120). |
| Key words: UHVDC system line fault location double-end traveling wave method wavelet analysis travel wave velocity |
