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一种电力系统谐波信号的加窗频移算法

DOI: 10.13334/j.0258-8013.pcsee.2014.10.015, PP. 1631-1640

Keywords: 谐波分析,非同步采样,加窗,插值算法,频移

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Abstract:

为实现非同步采样条件下谐波参数的高精度分析,避免插值过程的非线性导致对谐波相位计算存在较大误差的问题,提出了一种电力系统谐波参数估计新算法,即加窗频移算法。推导了加窗信号频移关系式,将加窗信号在频域上移动该频移量的频率单位,使谐波分量采样序列的离散频点与真实频点一致。通过频移信号的离散傅里叶变换,获取谐波信号真实的频谱,进而求得谐波参数。该算法的优势在于实现了频移思想在谐波分析上的应用,通过对加窗信号进行频域移动,消除非同步采样误差,将非同步问题同步化处理,同时避免了加窗插值算法等校正算法的修正过程,对幅值、相位、频率的估计有较简单的计算公式。算例分析验证了该方法的正确性,表明在噪声干扰下仍可获得很高的分析精度,尤其能改善相位估计的精度。

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