Tehnički vjesnik, Vol. 24 No. 1, 2017.
Izvorni znanstveni članak
https://doi.org/10.17559/TV-20160525173140
Spectral correction method based on improved flat-top convoluted window for parameter estimation of power harmonic
Shuping Song
; College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China
Hongzhong Ma
; College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China
Zhiyan Zhang
; College of Electrical Information Engineering, University of Light Industry Zhengzhou, 450002, China
Sažetak
Accurate estimation of harmonic parameter is an important task in signal processing of power system. A new class of flat-top windows is proposed, which is generated by self-convolutions of the fast-decaying minimum-sidelobe flat-top (FDMS-FT) window in the time-domain. The mainlobe and sidelobe features of the new window are studied. In addition, to improve the flatness of mainlobe of the new window, the coefficients of its parent window are optimized. A window-length changeable discrete phase difference correction algorithm based on the new window is presented to estimate power harmonic parameter. In order to inspect the efficiency and accuracy of the presented method, several computer simulations and practical experiments were conducted with power multi-frequency signals. Results show that the proposed method can reduce the computation load efficiently and gives a high parameter estimation accuracy of power harmonic.
Ključne riječi
fast Fourier transform; flat-top window; parameter estimation; power system harmonic; spectral correction; spectral leakage
Hrčak ID:
174703
URI
Datum izdavanja:
10.2.2017.
Posjeta: 2.225 *