Hanning自卷积窗及其在谐波分析中的应用

加窗插值FFT算法可以有效降低频谱泄漏和栅栏效应对谐波分析精度的影响.本文提出一种由Hanning窗进行自卷积运算得到的Hanning自卷积窗,分析了卷积阶数对主瓣宽度、旁瓣电平和旁瓣衰减速率的影响,计算了1~4阶Hanning自卷积窗的主瓣、旁瓣性能参数,给出了基于Hanning自卷积窗的双峰插值FFT谐波分析算法.仿真结果表明,Hanning自卷积窗具有优良的频谱抑制性能,基于Hanning自卷积窗的双峰插值FFT算法能有效消除各次谐波间的相互干扰,适合于电力谐波的高精度检测,与已有加窗插值FFT谐波分析算法相比,精度有明显提高,且便于嵌入式系统实现.

Hanning Self-Convolution Windows and Its Application to Harmonic Analysis

Suitable windows and interpolation FFT algorithms have been used to eliminate the errors caused by spectral leakage and picket fence effect. New kinds of windows, called as Hanning self-convolution windows(HSCW), are presented. The p-order HSCW is produced by convolving p Hanning windows. The major lobe and side lobes characteristics of p-order HSCW are discussed and an interpolated FFT algorithm based on HSCW is given. As the new windows have the optimal side lobe levels and the side lobes decay at a very ...