一种电网间谐波检测新方法  

A New Method for Inter-harmonic Detection of Power Grid

作　　者：曹英丽[1] 杨勇[1] 陈春玲[1] 许童羽[1] 

机构地区：[1]沈阳农业大学信息与电气工程学院,沈阳110161

出　　处：《沈阳农业大学学报》2009年第6期755-757,共3页Journal of Shenyang Agricultural University

基　　金：辽宁省教育厅高校科研A类项目(2008635)

摘　　要：提高间谐波检测精度的一个关键问题是如何减少谐波频谱泄漏对其造成的影响。提出一种新的"双阶段"间谐波检测方法,第一阶段基于加窗插值FFT方法检测谐波分量,并将其从原信号中滤除掉;第二阶段以固定的采样频率对保留的样值信号进行FFT分析,在没有谐波频谱泄漏干扰的前提下提取间谐波分量。仿真结果表明:该方法不需要同步处理,计算量小,检测精度高,适于对间谐波的快速检测。A key problem for improving inter-harmonic detection precision is how to reduce the influence caused by harmonic spectral leakage.A＂two-stage＂novel method of inter-harmonics detection was presented.In the first stage,harmonics components were detected through window-interpolated FFT,and were filtered away from original signal.In the second stage,the reserved signal was analyzed through FFT with fixed sampling frequencies.The inter-harmonics components could be extracted under condition of no harmonic spectral leakage interference.The simulation results showed that the new method needed no synchronized process,and had advantages of smaller calculation amount but higher detection accuracy.The method is applicable to a rapid detection of inter-harmonics.

关 键 词：间谐波 频谱泄露 谐波滤除 加窗插值FFT 

分 类 号：TP206[自动化与计算机技术—检测技术与自动化装置]