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Fourier Transform-Based Phasor Estimation Method and Apparatus Capable of Eliminating Influence of Exponentially Decaying DC Offsets
Fourier Transform-Based Phasor Estimation Method and Apparatus Capable of Eliminating Influence of Exponentially Decaying DC Offsets
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机译:基于傅立叶变换的相量估计方法和装置能够消除指数衰减的直流偏移的影响
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摘要
Disclosed herein is a Fourier transform-based phasor estimation method and apparatus capable of eliminating the S 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.
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