基于VMD和MC-PE的配电网故障行波检测方法  

Traveling wave detection method of distribution network fault based on VMD and MC-PE

作　　者：王永雪 任文平[1,2] 李鹏 于虹[3] Wang Yongxue;Ren Wenping;Li Peng;Yu Hong(School of Information,Yunnan University,650500 Kunming,China;Key Laboratory of Internet of Things Technology and Application in Yunnan Province,Kunming 650500,China;Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming 650214,China)

机构地区：[1]云南大学信息学院,昆明650500 [2]云南省高校物联网技术及应用重点实验室,昆明650500 [3]云南电网有限责任公司电力科学研究院,昆明650214

出　　处：《国外电子测量技术》2022年第2期7-15,共9页Foreign Electronic Measurement Technology

基　　金：国家自然科学基金(62163036);云南省中青年学术和技术带头人后备人才项目(202105AC160094)资助

摘　　要：针对配电网故障行波波头在强噪声背景下难以准确检测的问题,提出了一种基于变分模态分解(variational mode decomposition,VMD)和滑动移除排列熵(moving cut data-permutation entropy,MC-PE)的故障行波检测方法。首先利用排列熵方法优化VMD的降噪性能来重构低噪信号,实现对故障信号降噪的同时保留重要突变信息;然后利用VMD分解重构后的低噪信号,提取分解后信号的第1本征模态分量进行分析;最后利用滑动移除排列熵方法检测故障行波波头位置,实现故障行波波头的精准检测。仿真及现场数据试验结果表明,所提方法可在强噪声干扰情况下可快速、准确地检测故障行波波头位置,检测精度优于传统的故障行波检测方法,使行波法在配电网故障定位中精度提高10%。应用该方法可更好地在配电网中实施行波保护和故障点精准定位,实际应用价值突出。Aiming at the difficulty in detecting the traveling wave heads of faults in the current distribution network under the background of strong noise,a method based on variational mode decomposition(VMD)and moving cut data-permutation entropy(MC-PE)fault traveling wave detection method.First,the permutation entropy method is used to optimize the noise reduction performance of VMD to reconstruct the low-noise signal,so as to reduce the noise of the signal while retaining important mutation information.Then use VMD to decompose the low-noise signal,and extract the first eigenmode component of the decomposed signal for analysis.Finally,the position of the faulty traveling wave head is calibrated by the sliding removal permutation entropy method,and the accurate detection of the faulty traveling wave head is realized.The simulation and field data test results show that the proposed method can quickly and accurately detect the position of the faulty traveling wave head under strong noise interference,and the detection accuracy is better than the traditional wave head detection algorithm,which shortens the fault location error of the distribution network by 10%.The application of the method in this paper can better implement traveling wave protection and precise fault location in the distribution network.which has practical application value.

关 键 词：配电网 故障行波 变分模态分解 排列熵 滑动移除排列熵 

分 类 号：TM935[电气工程—电力电子与电力传动]