基于零模行波波速特性的配电网单相接地故障测距方法

发布时间：2018-08-09 09:13

【摘要】：针对零模波速随频率变化大的问题,提出利用零模行波波速特性求取波速的方法,并将其应用到配电网单相接地故障测距中。将行波信号分解到小波各个频带内,不同的频带信号会产生不同的衰减和相移,但各个频带上初始行波波速都会大于第1次反射波波速。利用零模行波波速的这种特性,选取初始行波波速与第1次反射波波速最相近的特征频带。在该频带下利用线模行波和零模行波波头一一对应关系求取第一次反射波波速,将其代入基于零模和线模波速差的测距公式,得到精确的故障距离。利用PSCAD/EMTDC搭建仿真模型,对不同的故障情况进行仿真,结果证实了所提方法的有效性和准确性。
[Abstract]:Aiming at the problem that the zero-mode wave velocity varies with the frequency, a method to calculate the wave velocity by using the zero-mode traveling wave velocity characteristic is put forward, and it is applied to the single-phase grounding fault location of distribution network. When the traveling wave signal is decomposed into each frequency band of wavelet, the different frequency band signal will produce different attenuation and phase shift, but the initial traveling wave velocity in each frequency band will be larger than the first reflected wave velocity. By using the characteristic of zero mode traveling wave velocity, the characteristic frequency band of the initial traveling wave velocity and the first reflected wave velocity is chosen. In this frequency band, the first reflected wave velocity is obtained by using the one-to-one correspondence relationship between the linear mode traveling wave and the zero mode traveling wave head, and the accurate fault distance is obtained by replacing the first reflected wave velocity with the ranging formula based on the zero mode and line mode wave velocity difference. The simulation model is built with PSCAD/EMTDC, and the simulation results show that the proposed method is effective and accurate.
【作者单位】：东北大学信息科学与工程学院;
【基金】：国家自然科学基金项目(61433004) 中央高校基本科研业务费项目(N130604001)~~
【分类号】：TM727

【参考文献】