基于零模-线模波速差的配电网单端测距新方法  

A New Method of Traveling Wave Ranging in Distribution Networks Based on the Difference between Zero-and Aerial-Mode Velocities

作　　者：邓志祥 张帆[2] 潘建兵 徐在德 郭紫华 郭亮 王晓卫 DENG Zhixiang;ZHANG Fan;PAN Jianbing;XU Zaide;GUO Zihua;GUO Liang;WANG Xiaowei(Electric Power Research Institute of State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330000,Jiangxi,China;School of Electrical Engineering,Xi’an University of Technology,Xi’an 710054,Shaanxi,China;State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330000,Jiangxi,China)

机构地区：[1]国网江西省电力有限公司电力科学研究院,江西南昌330000 [2]西安理工大学电气工程学院,陕西西安710054 [3]国网江西省电力有限公司,江西南昌330000

出　　处：《电网与清洁能源》2023年第1期78-84,共7页Power System and Clean Energy

基　　金：国家自然科学基金项目(52177114);国网江西省电力有限公司科技项目(52182020009H)。

摘　　要：针对传统行波定位法应用在配电网中产生测距误差大、成本高的问题,提出一种结合单端法与双端法优点的波速差定位新方法。对量测端采集的电压行波信号进行相模变换,得到线、零模分量;利用小波变换模极大值在第五尺度下标定故障初始波头;利用基于零模、线模波速差的单端测距法同时进行单独测距,综合两侧的测距信息后判定出具体的故障位置。PSCAD仿真验证表明,与传统单端测距法对比,该文方法不受过渡电阻、故障初始相角及分支点的影响,具有较好的故障测距准确性。For the large ranging error and high cost of the traditional traveling wave location method in distribution networks,a new wave velocity difference location method combining the advantages of the single terminal method and the double terminal method is proposed. Firstly,the voltage traveling wave signal collected at the measuring end is transformed by phase mode to obtain line and zero mode components. Secondly,the wavelet transform modulus maxima are used to calibrate the fault initial wave head in the fifth scale. Finally,the single ended fault location method based on zero and linear mode wave velocity difference is used to locate the fault separately at the same time,and then the specific fault location is determined by synthesizing the ranging information on both sides. The PSCAD simulation results show that compared with the traditional single ended ranging method,this method is not affected by transition resistance,fault initial phase angle and branch point,and has good accuracy.

关 键 词：电压行波 模极大值 波速差 故障测距 

分 类 号：TM77[电气工程—电力系统及自动化]