摘要
针对煤矿井下供电线路工作环境复杂、现有故障定位方法定位困难的问题,提出一种改进的煤矿供电线路故障定位算法。采用变分模态分解方法对故障行波信号进行分解,将信号从频域到时域进行转换,得到各个模态分量的中心频率和带宽。利用S变换,将行波信号在频率尺度上精确分解,获得保留有效特征信息的S模矩阵。引入高斯窗幅度拉伸因子,实现对提取出的S模矩阵时频分辨率的灵活调节。利用能量算子对广义S故障定位算法进行改进,获取调节后的模态分量的瞬时能量变化。将瞬时能量谱峰值所对应的时刻代入行波测距公式中,获取故障位置。仿真结果验证了该改进算法在煤矿井下供电线路单相接地故障定位中具有较高精度和有效性。
An improved fault location algorithm for coal mine power supply lines is proposed for the problem that the existing fault location methods are difficult to locate due to the complex working environment of underground coal mine power supply lines.A variational modal decomposition method is used to decompose the fault traveling wave signal,transform the signal from frequency domain to time domain,and obtain the center frequency and bandwidth of each modal component.Using S-transform,the traveling wave signal is accurately decomposed on the frequency scale to obtain the S-mode matrix that retains the effective feature information.A Gaussian window amplitude stretching factor is introduced to achieve flexible adjustment of the time-frequency resolution of the extracted S-mode matrix.The generalized S-fault localization algorithm is improved by using the energy operator to obtain the instantaneous energy change of the modal components after the adjustment.The moment corresponding to the peak of the instantaneous energy spectrum is substituted into the traveling wave ranging equation to obtain the fault location.The simulation results verify that the improved algorithm has high accuracy and effectiveness in locating single-phase ground fault in underground coal mine power lines.
作者
茹瑞鹏
郭志强
田锦绣
张昭亮
刘尚霖
RU Rui-peng;GUO Zhi-qiang;TIAN Jin-xiu;ZHANG Zhao-liang;LIU Shang-lin(Licun Coal Mine,Cilinshan Coal Industry Co.,Ltd.,Shanxi Lu7an Mining Group,Changzhi 046000,China;Faculty of Electrical and Control Engineering,Liaoning Technical University,Huludao 125000,China)
出处
《机械工程与自动化》
2022年第2期1-3,6,共4页
Mechanical Engineering & Automation
基金
国家自然科学基金资助项目(51974151,71771111)
辽宁省高等学校国(境)外培养项目(2019GJWZD002)
辽宁省高等学校创新团队项目资助(LT2019007)。
关键词
供电线路
故障定位
能量行波
相模变换
power supply line
fault location
energy travelling wave
phase-mode transformation
