电力系统保护与控制Issue(19)：107-113,7.
基于四谱线插值FFT的电网谐波检测方法
A power network harmonic detection method based on the four-spectrum-line interpolation FFT
摘要
Abstract
When the Fast Fourier Transform (FFT) method is used to analyze the harmonics in a power network, the sampled signal’s non-integral period truncation and non-synchronous sampling can cause the spectrum leakage, which will affect the accuracy of the detective results. In order to improve the accuracy of the harmonic detection, this paper puts forward a Fast Fourier Transform algorithm based on four-spectrum-line interpolation algorithm. Through analyzing the adding window signal amplitude information at the discrete frequency points, the algorithm further enhances the accuracy of the amplitude and phase detection by using weighted arithmetic of four pillars spectral line near the harmonic frequency point. By data fitting, practical correction formulas corresponding to commonly used window functions are obtained. Through numerical simulation analysis, it can be seen that the algorithm has higher detection accuracy. The accuracy and effectiveness of the algorithm is verified by the results of the simulation.关键词
四谱线插值/快速傅里叶变换/谐波检测/窗函数/数据拟合Key words
four-spectrum-line interpolation/FFT/harmonic detection/window function/data fitting分类
信息技术与安全科学引用本文复制引用
郝柱,顾伟,褚建新,麻朝..基于四谱线插值FFT的电网谐波检测方法[J].电力系统保护与控制,2014,(19):107-113,7.基金项目
省部级项目“船舶电力推进系统故障诊断与安全控制技术研究及应用”(11170501700) （11170501700）
