摘要
以Flat-top窗为例,分析了它的旁瓣频谱特性,并提出了基于双谱线相位加权的加窗插值校正算法求取谐波频率偏移量。该算法首先采样N点信号,提取N/2奇数点和N/2偶数点信号进行FFT,分别得到谐波附近最大谱线和次最大谱线的相位,再通过对相位差加权得到谐波的频率。仿真结果表明,该算法能有效减小电力系统中相量参数估计的偏差,提高了谐波的检测精度。
Taking Flat-top window for a example,this paper analyzed its spectral characteristics of sidelobes and made a double-line phase based on the weighted harmonic correction algorithm to obtain the frequency offset.Firstly,it sampled N point signal,then extracted N/2 odd and N/2 even point signal to run FFT,which could get the phase of the maximum line and sub-maximum line spectra respectively.Lastly,it obtained frequency of harmonic with the phase-weighted difference.The simulation results show that the algorithm can effectively reduce estimation error in phasor parameters and improve detection accuracy of the harmonic.
出处
《计算机应用研究》
CSCD
北大核心
2012年第6期2117-2119,共3页
Application Research of Computers
基金
湖南省自然科学基金资助项目(10JJ5055)
关键词
谐波
频谱泄露
双谱线
相位加权
频率偏移
加窗插值
harmonics
spectral leakage
two spectral lines
phase-weighted
frequency offset
windowed and interpolation
