摘要
采用快速傅里叶变换 (FFT)进行电力系统谐波分析时很难做到同步采样 ,故造成频谱泄漏 ,影响谐波分析的结果。本文对FFT的泄漏原因进行了分析 ,并用组合余弦窗对采样数据加权及利用插值对FFT的结果进行修正 ,精度得到极大的提高。文中给出了该算法进行谐波分析的算例 ,计算结果表明 ,基于Blackman Harris窗的算法具有更高的计算精度和效率。
There are difficulties in harmonic analysis of power system with sysnchronized sampling using FFT alogorithm But if this condition is not satisfied,the results will be disturbed by the frequency leakage This paper analyses the reasons of leakage of FFT alogorithm, with using the poly-consin window for the sampling data window and using interpolation to amend the FFT results,the accuracy is improved obviously The simulating results shows that the alogorithm has higer efficency and Blckman Harris window has the higher accuracy
出处
《电工技术杂志》
2004年第10期61-64,共4页
Electrotechnical Journal
