Detection of inter-harmonics based on spectrum leakage
With the extensive application of a large number of nonlinear electrical components,harmonic and inter-harmonic components in power system become more and more complex.The harmonics,inter-harmonic and fundamental wave are in the superposition state.The traditional harmonic detection method is Fast Fourier Transform (FFT),which can realize the accurate detection and analysis of integer harmonics.But in the measurement of the harmonic,the actual signal detected should be by discretization using the sampling signal,which caused the phenomenon of spectrum leakage and fence phenomenon.However,since inter-harmonic is relatively small,the harmonic wave and fundamental wave become the noise of detecting inter-harmonic.These problems become a huge obstacle to the amplitude,frequency and phase of the accurate detection of inter-harmonic.In this paper,the spectrum leakage phenomenon is discussed.Based on the characteristics of the harmonic and fundamental wave,the improved algorithm is proposed.The method is based on simple transformation of Fast Fourier Transform (FFT) and combine respective characteristics of harmonics and inter-harmonic to solve the problem of measuring harmonic and inter-harmonic interference and achieve accurate detection of inter-harmonic.The method is effective in combination with the three point method,so it is more competitive with respect to other methods.The method has the advantages of simple operation,fast calculation and high accuracy,which can provide an effective method for the harmonic detection of power quality analysis.
inter-harmonic Fast Fourier Transform(FFT) spectrum leakage window function
Jingxiang Zeng Xingong Cheng Xiju Zong Yimei Li
University of Jinan, China
国际会议
重庆
英文
33-39
2016-03-21（万方平台首次上网日期，不代表论文的发表时间）