摘要
窄带干扰抑制一直是电力设备局放在线监测中的一项重要课题,已有许多用于抑制窄带干扰的数字信号处理方法。文章在研究快速傅里叶变换(FFT)频域阈值法的基础上,提出了一种改进算法,即利用多项式拟合的方法,在原有阈值法置零区域的两侧进行周边频带处理,使算法能够适应更宽频带内的窄带干扰。仿真计算和实测数据处理结果表明该算法有较好的干扰抑制效果。
The suppression of discrete spectral interference (DSI) is always an important topic in on-line partial discharge monitoring and for this purpose many digital signal processing methods are put forward. Based on the research of the threshold value method of frequency domain in fast Fourier transform, an improved algorithm is presented in which by use of polynomial curve fitting method the processing of the peripheral frequency band of the spectral is carried out at the both sides of the zero setting area of the original threshold value method, so the algorithm can adapt the DSI in a wider frequency band. The results from simulation and measured data indicate, that using this algorithm a better interference suppression can be obtained.
出处
《电网技术》
EI
CSCD
北大核心
2004年第13期80-83,共4页
Power System Technology
