Fourier transform-based phasor estimation method and apparatus capable of eliminating influence of exponentially decaying DC offsets
    9.
    发明授权
    Fourier transform-based phasor estimation method and apparatus capable of eliminating influence of exponentially decaying DC offsets 有权
    能够消除指数衰减DC偏移影响的基于傅立叶变换的相量估计方法和装置

    公开(公告)号:US08145443B2

    公开(公告)日:2012-03-27

    申请号:US12423223

    申请日:2009-04-14

    IPC分类号: G01R23/16

    摘要: Disclosed herein is a Fourier transform-based phasor estimation method and apparatus capable of eliminating the influence of exponentially decaying DC offsets. According to a Fourier transform-based phasor estimation method according to an embodiment of the present invention, an input signal is sampled, and samples of one-cycle data of the input signal are separated into at least two sample groups. A Discrete Fourier Transform (DFT) is performed on each of the sample groups. A DC offset included in the input signal is calculated on a basis of results of the DFT on each of the sample groups, and an error caused by the DC offset is calculated using the calculated DC offset. A phasor of a fundamental frequency component included in the input signal is estimated by eliminating the calculated error, caused by the DC offset, from the results of the DFT on the input signal.

    摘要翻译: 本文公开了一种能够消除指数衰减DC偏移影响的基于傅立叶变换的相量估计方法和装置。 根据本发明实施例的基于傅里叶变换的相量估计方法,对输入信号进行采样,将输入信号的一周期数据的采样分成至少两个采样组。 对每个样本组执行离散傅里叶变换(DFT)。 基于每个样本组上的DFT的结果计算输入信号中包括的DC偏移,并且使用计算的DC偏移计算由DC偏移引起的误差。 通过从输入信号的DFT的结果中消除由DC偏移引起的计算出的误差来估计包括在输入信号中的基频分量的相量。