Power Harmonic Analysis Based on Continuously Adjustable Asymmetric Window

The study of harmonics signal analysis in electric power system is a classic and important research subject. The signal by using traditional Fourier transform methods are nearly truncated by constant coefficient symmetry window or asymmetric window. This paper propose the improved continuously adjustable asymmetric window for precise harmonic parameters measurement and the uniform formulas for calculating the parameters of harmonics and interharmonic is obtained by the asymmetric window-based phase difference correction method. The major advantages of this method is easy to implement and independent of window spectrum. The simulation analysis results proves that there is obvious high precision, effectiveness and universal applicability of this method

E4.28 ON THE USE OF ASYMMETRIC WINDOWS FOR REDUCING THE TIME DELAY IN REAL-TIME SPECTRAL ANALYSIS

ABSTRACT In this paper we' analyze windows with relation t o time delay. After selecting an appropriate The idea of asymmetric windowing as a way of criterium f o r implicit delay, we comment on the reducing time delay in spectral analysis is delay implicit in some traditional windows. Then, explored. Traditional windows a r e analyzed in we introduce some asymmetric windows and a relation t o time delay. Then, some asymmetric comparative analysis is made. The final part of the windows a r e introduced and a comparative analysis paper deals with the application of asymmetric with traditional windows is made. I t is shown that it is possible t o reduce the time delay up t o about , 257. of the analysis window size. Application on LP speech coding is analyzed, and the experimental results of using an asymmetric window on a Standard LPC vocoder a r e presented