基于五项窗Rife-Vincent(Ⅰ)插值FFT算法的谐波参数分析  

Harmonic Analysis Based on Rife-vincent(Ⅰ) Window With Five Coefficients Interpolation FFT

作　　者：胡振华[1] 孙树平[1] 王海滨[1] 陈蓉芳[1] 陈洁[1] 

机构地区：[1]西华大学电气信息学院,四川成都610039

出　　处：《西华大学学报（自然科学版）》2008年第6期28-33,共6页Journal of Xihua University:Natural Science Edition

基　　金：四川省教育厅自然基金重点项目(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：采用选择性暂态程序ATP建立一个实际的400/33kV工业电力系统的仿真模型,对电缆线路谐波电流进行仿真。由于快速傅里叶变换在非同步采样时存在较大的误差,无法直接用于电力系统谐波分析,本文提出了一种基于五项窗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。然后针对不同程度的频谱泄漏,采用FFT和五项窗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:该算法较FFT算法在频率、幅值和相位的估计值精度上有明显提高。In this paper,a real industrial 400/33 kV power system simulation model is established using the ATP(the alternative transients program),and the harmonic current flowing through a cable is simulated.To reduce the influence of an unsynchronized sample sequence on FFT and improve the precision of harmonic in a power system,the harmonic estimation based on interpolation FFT algorithm is proposed.The estimation based on five coefficients of Rife-Vincent(Ⅰ) window is discussed in detail and the formulas for estimating harmonic patameters are deduced.Considering varying degrees of spectrum leakage,harmonic current is analyzed using FFT algorithm and Rife-Vincent(Ⅰ) window with five coefficients interpolation FFT algorithm.Sixteen harmonics parameters are calculated and analyzed.The result obtained from the estimation demonstrates that the estimation harmonic frequency,amplitude and phase are very accurate using the improved algorithm for the analysis of an unsynchronized sample sequence.

关 键 词：电力系统 谐波分析 ATP 五项窗Rife—Vincent(Ⅰ) 插值FFT算法 

分 类 号：TM711[电气工程—电力系统及自动化]