基于三次样条函数的加Rife-vincent自卷积窗插值FFT算法的电力系统谐波检测  

Power system harmonic detection based on cubic spline function and Rife-vincent self-convolution window interpolation FFT algorithm

作　　者：张莹莹 Zhang Yingying(Xinyang City,Henan Province,Quality and Technical Supervision,Inspection and Testing Center,Xinyang 464000,China)

机构地区：[1]河南省信阳市质量技术监督检验测试中心,河南信阳464000

出　　处：《电子技术应用》2018年第10期171-173,178,共4页Application of Electronic Technique

摘　　要：采用快速傅里叶变换(FFT)对电力系统进行谐波分析时,由于非同步采样和数据截断,将会产生栅栏效应和频谱泄漏现象,无法得到准确的谐波参数。为提高非同步采样的谐波检测精度,提出基于三次样条函数的加Rifevincent自卷积窗插值FFT算法。Rife-vincent自卷积窗旁瓣峰值低,旁瓣衰减速度快,能够有效抑制频谱泄漏,采用三次样条函数逼近幅值比函数,可有效抑制栅栏效应,避免解高次方程,实时性好,计算精度高。通过MATLAB仿真分析,验证了基于三次样条函数的加Rife-vincent自卷积窗插值FFT算法能够有效抑制频谱泄露和栅栏效应,提高谐波检测精度。When using the Fast Fourier Transform(FFT)to perform harmonic analysis on power systems,due to asynchronous sampling and data truncation,fence effect and spectrum leakage will occur,and accurate harmonic parameters cannot be obtained.In order to improve the accuracy of harmonic detection of asynchronous sampling,this paper proposes a Rife-vincent self-convolution window interpolation FFT algorithm based on cubic spline function.The Rife-vincent self-convolution window has low peak value and fast sidelobe attenuation,which can effectively suppress spectral leakage.The cubic spline function is used to approximate the amplitude ratio function,which can effectively suppress the fence effect and avoid solving high-order equations.The calculation accuracy is high.Through MATLAB simulation analysis,it is verified that the Rife-vincent self-convolution window interpolation FFT algorithm based on cubic spline function can effectively suppress spectrum leakage and fence effect and improve harmonic detection accuracy.

关 键 词：谐波分析 Rife-vincent自卷积窗 三次样条函数 频谱泄漏 栅栏效应 

分 类 号：TM933[电气工程—电力电子与电力传动]