刘冬梅，郑鹏，何怡刚.几种谐波检测加窗插值FFT算法的比较[J].电测与仪表,2013,50(12):. .Analysis and Comparison of Several Harmonics Detection Methods[J].Electrical Measurement & Instrumentation,2013,50(12):.
几种谐波检测加窗插值FFT算法的比较
Analysis and Comparison of Several Harmonics Detection Methods
The harmonics poses great threat to the safe and economical operation of the power grid. It’s necessary to detect the parameters of harmonic accurately for the treatment of the harmonics. Fast fourier transform (FFT), a classical harmonic detection, has big errors in detecting the parameters of harmonics. With the application of the high-performanced windows and interpolation methods, the harmonic detection precision of FFT has been improved. On the basis of FFT, this paper introduces Lagrange, Hermite, Cubic Spline interpolation methods, and addes correction factor. From the analysis of the simulation datas, it can be concluded that the cube spline interpolation can easily eliminate the picket fence effect. On the basis of FFT, Hanning window, Hamming window, Nuttal window, Rife-Vincent window, Blackaman window and Blackaman-Harris window are added to help detecting the harmonic. After the analysis of the data of the simulations, it can be concluded that the Blackman-Harris window has characteristics of narrow main lobe and good effect on inhabiting the amplitude the side lobe. At the end of the paper, it proposes a harmonic detecting method which is based on FFT with Blackman-Harris window and cube spline interpolation, which can provides highly accurate and stable data.
