采用Van-der混沌振子抑制局部放电信号中周期性窄带干扰  

Van-der Chaotic Oscillator to Suppressing the Periodic Narrow-band Interference from Partial Discharge Pulse Signal

作　　者：舒娜[1] 张晓星[1] 孙才新[1] 周君杰[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《高电压技术》2012年第1期89-94,共6页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724506)~~

摘　　要：局部放电在线监测的热点与难点之一是如何有效去除现场大量的干扰,从而真实地提取局部放电信号。为此,从非线性理论出发,基于Van-der混沌振子的运动特性,提出用Van-der混沌振子去除局部放电信号中周期性窄带干扰的新思路。该振子的时域波形对于与参考信号频差较小的周期信号具有敏感性,对噪声和与参考信号频差较大的周期信号具有免疫力。然后重新定义一种Floquet指数,利用该振子实现了多种混叠信号中周期性窄带信号幅值的检测。最后通过仿真实验和实测信号分析验证了利用该混沌振子检测周期性窄带干扰信号的可行性和有效性。How to effectively eliminate noise and truly extract partial discharge signals is one of the most popular and difficult problems in partial discharge on-line monitoring.From the nonlinear theory,we put forward a new approach to remove the periodic narrow-band interference from partial discharge signals with Van der chaotic oscillator.The time domain waveform of this oscillator is sensitive to the cycle signal with smaller frequency difference of reference signal,meanwhile,the oscillator is immune to the cycle signal with larger frequency difference of reference signal,and it is used to realize measurement of periodic narrowband signal amplitude from several signals using the oscillator by redefining a Floquet index.Finally,the simulation experiments and measured signal analysis verify that the approach which adopts the chaotic oscillator to detect the periodic narrowband interference signal is feasible and efficient.

关 键 词：局部放电 窄带干扰 混沌振子 Van-der系统 广义Floquet指数 去噪 

分 类 号：TM835[电气工程—高电压与绝缘技术]