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电网技术  2010 

降阶快速傅里叶变换算法在电力系统谐波分析中的应用

, PP. 117-120

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Abstract:

在电力系统谐波分析中,国际IEC关于谐波测量的最新标准推荐算法是标准快速傅里叶变换(fastFouriertransform,FFT),并要求对于50Hz系统必须连续采样10周期。为了得到良好的精度,FFT算法要求时域采样点数N足够大,但N越大计算量也越大。利用FFT降阶运算减少了计算,并解决了如果在10周期内采样点数不是2的幂无法用FFT运算的问题。另外失步时对于多周期多点FFT,用三角窗比用Hanning窗精度高,最后运用算例进行了Matlab仿真验证。

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