基于小波降噪和EMD-AR谱的地下电缆防破坏监测系统  

Underground Cable Anti Damage Monitoring System Based on Wavelet De⁃noise and EMD-AR Spectrum

作　　者：舒俊 叶帆 姚峰林[2] SHU Jun;YE Fan;YAO Fenglin(State Grid Jiangxi Electric Power Co.,Ltd.Nanchang Power Supply Branch,Nanchang 330000,Jiangxi,China;School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030000,Shanxi,China)

机构地区：[1]国网江西省电力有限公司南昌供电分公司,江西南昌330000 [2]太原科技大学机械工程学院,山西太原030000

出　　处：《电气传动》2024年第11期91-96,共6页Electric Drive

基　　金：国家自然科学基金(52075356);山西省教学改革项目(J2021411)。

摘　　要：电力电缆在当今社会发展和城市运作中扮演着非常重要的角色。随着人们用电量增加,电缆的铺设量也在同步增加。为防止电缆遭到破坏,对电缆管廊周围环境振动信号进行监测,及时发现潜在威胁,保障电缆正常工作,提出一种基于Matlab小波降噪算法和EMD-AR谱分析的地下电缆防破坏振动监测系统。该系统由太阳能供电模块、六轴陀螺仪姿态感应模块、振动传感器模块、物联网通信模块组成,主控芯片使用STM32F4单片机。采用小波阈值降噪算法去除复杂高频噪声,提高信号的可识别度,随后将去噪后信号进行经验模态分解(EMD),并对前6个固有模态函数(IMF)分量进行AR谱分析,最后将前6个IMF分量的AR谱累加得到信号的能量对比图。研究表明,该方法的应用准确分析出振动类型,能够给电缆管廊附近振动的监测分析提供更加简单便捷的方法,有效保护电缆的安全稳定运行。The power cable plays a very important role in today's social development and urban operation.With the increase of people's electricity consumption,the amount of cable laying is also increasing synchronously.In order to prevent the cable from being damaged,the environmental vibration signals around the cable duct gallery are monitored,and potential threats are found in time to ensure the normal operation of the cable,a vibration monitoring system for underground cable damage prevention based on Matlab wavelet noise reduction algorithm and EMD-AR spectrum analysis was proposed.The system was composed of solar power supply module,six axis gyroscope attitude sensing module,vibration sensor module and internet of things communication module.The main control chip uses STM32F4 microcontroller.The wavelet threshold de-noising algorithm was used to remove the complex high-frequency noise and improve the signal identifiability.Then the de-noised signal was subjected to empirical mode decomposition(EMD)and AR spectrum analysis of the first six intrinsic mode function(IMF)components.Finally,the AR spectrum of the first six IMF components was accumulated to obtain the energy contrast map of the signal.The research shows that the application of this method can accurately analyze the type of vibration,which can provide a more simple and convenient method for the monitoring and analysis of vibration near the cable duct gallery,and effectively protect the safe and stable operation of the cable.

关 键 词：小波变换 阈值降噪 EMD-AR谱 电缆防破坏 振动分析 

分 类 号：TM93[电气工程—电力电子与电力传动]