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Elimination of DC Offset in Accurate Phasor Estimation Using Recursive Wavelet Transform

机译:消除使用递归小波变换的准确相位估计中的DC偏移

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DC offset has significant effect on extracting fundamental frequency components. It directly impacts the accuracy of the fundamental frequency component based protective relaying algorithms. This paper proposes a novel method for estimating the fundamental phasor while eliminating the dc offset using improved recursive wavelet transform. The proposed approach converges to the actual value in less than one cycle, and the computation burden is fairly low because of the recursive formula. Studies indicate that to achieve a certain level of accuracy, the higher sampling frequency one uses, the shorter data window the computation needs, and vice versa. Comparing with conventional DFT filter, simulation results demonstrate that the proposed phasor estimation method achieves better performance.
机译:DC偏移对提取基频分量具有显着影响。它直接影响基于基于基于基于基于基于基于频率分量的保护性的继电器算法。本文提出了一种估计基础相量的新方法,同时消除了使用改进的递归小波变换来消除DC偏移。所提出的方法会聚到较小的循环中的实际值,并且由于递归公式,计算负担相当低。研究表明,要达到一定的准确度,采样频率越高,数据窗口越短的计算需求,反之亦然。与传统DFT滤波器相比,仿真结果表明,所提出的相量估计方法实现了更好的性能。

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