中文摘要：

提出了一种基于十项余弦窗的插值FFT算法,分析了余弦组合窗的特性,从旁瓣特性的优势出发,运用旁瓣峰值较低的十项余弦窗,并用双谱线插值算法推导出其对应的修正公式.仿真计算结果表明,谐波幅值误差小于0.001％,相位误差小于0.001％.新的插值FFT算法与常用的Hannning窗、Blackman窗插值FFT算法的测量结果对比,进一步说明了该算法可以有效提高电力系统谐波测量精度,具备实际应用价值.

英文摘要：

An interpolated FFT algorithm based on a ten-terms cosine window is proposed.The characteristics of cosine window and the advantages of sidelobe peak are firstly analyzed,then the ten-terms cosine window of a low sidelobe peak is used,next the formulas of interpolated FFT algorithm based on the ten-terms cosine window is derived.Simulation results demonstrate that the amplitude error is less than 0.001％,and that the phase error is less than 0.001％.The comparison of the measurement result of this new interpolated FFT algorithm with the measurement results of interpolated FFT algorithm based on Hannning window and Blackman window,is verified that this algorithm enhances the measuring accuracy of power system harmonics and has actual application value.