工业电力系统谐波分析的高精度FFT算法  

FFT Algorithm with High Accuracy for Harmonic Analysis in Industry Power System

作　　者：胡振华[1] 王海滨[1] 张健毅[2] 

机构地区：[1]西华大学电气信息学院,成都610039 [2]山东师范大学物理与电子科学学院,济南250014

出　　处：《电力系统及其自动化学报》2009年第3期46-52,共7页Proceedings of the CSU-EPSA

基　　金：四川省教育厅自然科学基金重点项目(2004A116);西华大学人才引进项目(R0620907);西华大学学科建设项目(XZD0702-2)

摘　　要：为了减少非同步采样对快速傅里叶变换的影响,提高电力系统谐波分析的精度,详细介绍了一种基于五项窗Rife-Vincent(Ⅰ)插值FFT算法的谐波参数估计的新方法,并推导了其谐波参数估计公式。利用选择性暂态程序ATP建立一个实际的400/33kV工业电力系统的仿真模型,对系统的谐波电流进行仿真。然后针对不同程度的频谱泄漏,采用FFT和所提出的五项窗Rife-Vincent(Ⅰ)插值FFT两种算法对16次谐波参数估计值进行对比分析,实验结果表明:在相同条件下,五项窗Rife-Vincent(Ⅰ)插值FFT算法较FFT算法在频率、幅值和相位的估计值精度上有明显提高。In order to reduce the influence of an unsynchronized sample sequence on fast Fourier transform （FFT） and to improve the precision of harmonic analysis in power system, a harmonic estimation method based on interpolation FFT algorithm is proposed. The estimation algorithm based on five coefficients of Rife-Vincent（ 1 ） window is discussed in detail and estimating formulas of harmonic parameters are deduced in this paper. A real industrial 400/33 kV power system simulation model is established using the alternative transients program（ATP）, harmonic current in system is simulated. Considering varying degrees of spectrum leakage, harmonic current is analyzed using FFT algorithm directly and Rife-Vincent （ I ） window with five coefficients interpolation FFT algorithm, 16 harmonics parameters are calculated and error graphs of parameters evaluation are also plotted. Finally,the simulation results of the two algorithms are analyzed and compared. The simulation results demonstrate that the estimation harmonic frequency,amplitude and phase are highly accurate using the improved algorithm for the unsynchronized sample sequence analysis.

关 键 词：电力系统 谐波分析 快速傅里叶变换 非同步采样 五项窗Rife-Vincent(Ⅰ) 插值FFT算法 电磁暂态仿真程序 

分 类 号：TM711[电气工程—电力系统及自动化] TM712