An Approach for Electrical Harmonic Analysis Based on Optimized Composite Cosine Window Four-spectrum-line Interpolation FFT

被引：0
|
作者：
Chen Z. [1 ]
Wang L. [1 ]
Wang C. [1 ]
Shen P. [1 ]
Li Z. [1 ]
机构：
[1] School of Electrical Engineering, Beijing Jiaotong University, Haidian District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2020年 / 44卷 / 03期
关键词：
FFT; Four-spectrum-line interpolation; Genetic algorithm; Harmonic analysis; Window function parameter optimization;
D O I：
10.13335/j.1000-3673.pst.2019.0075
中图分类号：
学科分类号：
摘要：
When fast Fourier transform (FFT) method is used to analyze power harmonics, non-synchronous sampling and non-integer periodic truncation of signal would cause spectral leakage and fence effect, leading to certain detection errors. Window functions and interpolation algorithms can effectively improve detection accuracy of the FFT method. The spectral characteristics of the window function directly affect improvement effect. Therefore, a window function parameter optimization method based on genetic algorithm (GA) is proposed. The combined cosine window function is optimized using this method. A six-term fifth-order cosine window function is obtained, and an approach for electrical harmonic analysis based on this window four-spectrum-line interpolation FFT is achieved. Simulation shows that the detection result is better than adding third-order Nuttall window and fifth-order Nuttall window. © 2020, Power System Technology Press. All right reserved.
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页码：1105 / 1113
页数：8
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