Harmonic Phasor Analysis Based on Improved FFT Algorithm
Harmonic Phasor Analysis Based on Improved FFT Algorithm
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DOI：
10.1109/tsg.2010.2078841
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发表时间：
2011-03
影响因子：
9.6
通讯作者：
B. Zeng;Zhaosheng Teng;Yulian Cai;Siyu Guo;B.-Y. Qing
中科院分区：
文献类型：
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作者：
B. Zeng;Zhaosheng Teng;Yulian Cai;Siyu Guo;B.-Y. Qing
提出了一种异步采样条件下电力系统谐波相量分析方法。该方法采用四项五阶导数纳托尔（FFDN）窗口对采样数据进行平滑处理，然后采用改进的快速傅立叶变换（IFFT）算法计算频域谐波相量。采用多项式曲线拟合得到了适用于IFFT的整流公式，大大减少了计算量。在异步采样条件下，FFDN窗口可以有效抑制频谱泄漏，并且可以通过IFFT算法修正尖桩栅栏效应，整体算法易于在嵌入式系统中实现。通过仿真和实际实验，分析了该方法对基频波动、存在白噪声和间谐波的多频信号的有效性。
An approach for power system harmonic phasor analysis under asynchronous sampling is proposed in this paper. It is based on smoothing sampled data by windowing the signal with the four-term fifth derivative Nuttall (FFDN) window, and then calculating harmonic phasors in the frequency domain with an improved fast Fourier transform (IFFT) algorithm. The applicable rectification formulas of the IFFT are obtained by using the polynomial curve fitting, dramatically reducing the computation load. The FFDN window can effectively inhibit the spectral leakage and the picket fence effect can be modified by the IFFT algorithm under asynchronous sampling, and the overall algorithm can easily be implemented in embedded systems. The effectiveness of the proposed method was analyzed by means of simulations and practical experiments for multifrequency signals with the fluctuation of the fundamental frequency and with the presence of white noise and interharmonics.