基于测量波阻抗的同杆双回输电线路故障识别  

Fault identification of double-circuit transmission lines on same tower based on measuring wave impedance

作　　者：叶睿恺 吴浩 董星星 YE Rui-kai;WU Hao;DONG Xing-xing(Automation and Electronic Information Engineering,Sichuan University of Science and 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

出　　处：《浙江大学学报（工学版）》2019年第12期2412-2422,共11页Journal of Zhejiang University：Engineering Science

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

摘　　要：为提高行波保护在同杆双回输电线路上的灵敏性与可靠性,提出一种基于S变换的测量波阻抗比率制动故障识别算法.利用S变换获取母线电压与线路电流的初始行波相量,据此计算线路测量波阻抗,给出和波阻抗与差波阻抗概念,引入综合和波阻抗和综合差波阻抗.理论分析表明:当发生区内故障时,综合和波阻抗小于综合差波阻抗;当发生区外故障时,综合和波阻抗远大于综合差波阻抗.引入比率制动系数,将综合和波阻抗作为制动量,综合差波阻抗作为动作量,建立比率制动保护判据进行区内、外故障识别.大量仿真结果表明,该算法判据简单,性能可靠,动作灵敏、迅速,基本不受故障初始角、故障类型、过渡电阻、噪声干扰等因素影响.An algorithm for measuring wave impedance ratio braking fault identification was proposed based on Stransform, in order to improve the sensitivity and reliability of traveling wave protection on double-circuit transmission lines. S-transform was implemented to obtain the initial traveling wave phasor of the voltage of the busbar and the current of the transmission lines. Hereby, the measuring wave impedance of transmission line was calculated and the concepts of synthetical wave sum-impedance and synthetical wave differ-impedance were given.The theoretical analysis showed that, when an internal fault occured, the synthetical wave sum-impedance was smaller than the synthetical wave differ-impedance;when an external fault occured, the synthetical wave sumimpedance was much larger than the synthetical wave differ-impedance. The ratio braking coefficient was introduced, the synthetical wave sum-impedance was used as braking amount and the synthetical wave differimpedance was taken as actuating amount, and the ratio braking protection criterion was established to identify internal and external faults. A large number of simulation results show that the algorithm has advantages of simple criterion, reliable performance, sensitive and quick response, and is less susceptible to the changes in initial fault angles, fault types, transitional resistances, and other factors.

关 键 词：同杆双回输电线路 测量波阻抗 变换 综合和波阻抗 综合差波阻抗 故障识别 

分 类 号：TM773[电气工程—电力系统及自动化] TM771