摘要
针对配电网运行环境复杂,现有行波检测方法HHT和S变换应对强噪声干扰下识别效果不理想的问题,结合变分模态分解(Variational Mode Decomposition,VMD)和S变换有效分解非平稳信号的优势,提出一种耐受配电网噪声的故障行波检测方法,利用VMD将混有噪声的故障行波信号分解,获取不同尺度的固有模态分量IMFs,再经过S变换提取IMF1分量中的瞬时频率,最后准确辨识故障初始行波波头的到达时刻,解决EMD分解过程中模态混叠和端点效应现象,以及S变换在强噪声干扰条件下行波信号检测能力下降的问题。通过ATP/EMTP搭建仿真模型,结果表明,在强噪声干扰的条件下,所提检测方法相比于Hilbert-Huang变换和S变换,抗干扰检测效果更明显。
Aiming at the complex operation environment in distribution network and combining the advantages of Variational Mode Decomposition and S-transform in the field of non-stationary signal decomposition, a traveling wave detection scheme is proposed in this paper. It solves the problem of mode mixing and endpoint effect in EMD decomposition process, and the problem that the detection ability of traveling wave signal decreases when S-transform is disturbed by strong noise. It can accurately identify the arrival time of the initial traveling wave head. The simulation is built by ATP/EMTP, and the results show that, compared with Hilbert-Huang transform and S transform, the proposed detection method has better anti-jamming effect under strong noise conditions.
作者
祖亚瑞
向国杰
梁洪湘
刘战磊
李嘉康
黄慧
Zu Yarui;Xiang Guojie;Liang Hongxiang;Liu Zhanlei;Li Jiakang;Huang Hui(School of Electrical&Information Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China)
出处
《云南电力技术》
2019年第5期8-11,共4页
Yunnan Electric Power
关键词
配电网
行波检测
强噪声干扰
变分模态分解
S变换
Distribution network
traveling wave detection
strong noise interference
Variational Mode Decomposition
S transform
