基于初始行波相位差的同杆双回输电线路故障识别  

Fault identification of double lines on same tower based on phase difference of initial traveling wave

作　　者：叶睿恺 吴浩 董星星 YE Ruikai;WU Hao;DONG Xingxing(Automation and Electronic Information Engineering,Sichuan University of Science & Engineering,Zigong 643000,China)

机构地区：[1]四川轻化工大学自动化与信息工程学院,四川自贡643000

出　　处：《电力系统保护与控制》2019年第3期118-128,共11页Power System Protection and Control

基　　金：国家自然科学基金项目资助(11705122);四川省科技厅项目资助(2017JY0338);人工智能四川省重点实验室项目资助(2015RYY01;2017RYY02);四川理工学院研究生创新基金资助(y2017032;y2017033)~~

摘　　要：为提高行波保护的灵敏性和可靠性,提出一种基于初始电流行波相位比较的同杆双回线路快速保护新算法。基于S变换计算初始行波相位,通过分析同杆双回线路同端和对端上的初始电流行波相位关系构建保护判据。当内部单回线故障时,双回线路同一侧上电流行波相位近乎相反;内部同名相跨线接地故障时,线路同一侧上的电流行波相位近乎相同,同一条线路两端的电流行波相位近乎相同;区外故障时,两条线路同一侧的电流行波相位近乎相同,同一条线路两端的电流行波相位近乎相反。引入行波相位差的概念,通过分析电流行波相位差的变化特征识别同杆双回线路区内外故障。大量的仿真结果表明,该保护性能灵敏、可靠,动作速度快,判据简单,基本不受故障初始角、故障类型和过渡电阻等因素影响。In order to improve the sensitivity and reliability of traveling wave protection,a new algorithm for fast protection of double transmission lines on same tower is proposed based on initial current traveling wave phase comparison.In view of calculating initial traveling wave phase based on S-transform,and the protection criterion is constructed by analyzing the phasor relations of the initial current traveling wave at the same end and the opposite end of the same line.The current traveling wave phase of the same end is almost the opposite when the internal single line fault occurs.The current traveling wave phase of the same end is almost the same,and the current traveling wave phase of opposite end of the same line is almost the same when the internal cross line of the same phase fault occurs.When the external fault occurs,the current traveling wave phase of the same end is almost the same,and the current traveling wave phase of opposite end of the same line is almost the opposite.This paper introduces the concept of the phase difference of the traveling wave,and identifies the internal and external faults of the double lines on the same tower by analyzing the changing characteristics of the phase difference of the current traveling wave.A large number of simulation results show that the protection performance is sensitive,reliable,fast and simple criteria.The protection is barely influenced by the initial angle,fault type and transition resistance and other factors.

关 键 词：同杆双回线路 初始电流行波 S变换 相位比较 故障识别 

分 类 号：TM75[电气工程—电力系统及自动化]