Flat-top windows for PWM waveform processing via DFT

Salvatore, L.; Trotta, A.

doi:10.1049/ip-b.1988.0038

Cited by 54 publications

(15 citation statements)

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“…Accordingly, compared with classical flat-top window in [22,26], the improved FDMS-FT convoluted window exhibits both flatter mainlobes and greater sidelobe performance. Thus, the new window can suppress spectral leakage and enhance the accuracy of harmonic amplitude more effectively.…”

Section: The Improved Fdms-ft Convoluted Window With a Constant Lengthmentioning

confidence: 98%

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Spectral correction method based on improved flat-top convoluted window for parameter estimation of power harmonic

Song

Zhang

2017

Teh. vjesn.

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Original scientific paper 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.Keywords: fast Fourier transform; flat-top window; parameter estimation; power system harmonic; spectral correction; spectral leakage Spektralna korekcijska metoda utemeljena na poboljšanom spiralnom podesivom prozoru za procjenu parametara harmonijske snage Izvorni znanstveni članak Točna procjena harmonijskog parametra je važan zadatak u obradi signala elektroenergetskog sustava. Predlaže se nova vrsta flat-top prozora koja se generira vlastitim konvolucijama brzo padajućeg flat-top prozora (FDMS-FT) u domenu vremena. Proučavaju se značajke bočnog i glavnog režnja novog prozora. Nadalje, kako bi se poboljšala glatkoća glavnog režnja novog prozora, optimiziraju se koeficijenti matičnog prozora. Predstavlja se izmjenjivi algoritam ispravke razlike faze duljine prozora baziran na novom prozoru kako bi se procijenio strujni harmonični parametar. Kako bi se provjerila učinkovitost i točnost prikazane metode, provedeno je nekoliko računalnih simulacija i praktičnih eksperimenata s višefrekvencijskim strujnim signalima. Rezultati pokazuju da predložena metoda može učinkovito smanjiti opseg računanja i daje visok parametar točnosti procjene harmonijske snage.

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Section: The Improved Fdms-ft Convoluted Window With a Constant Lengthmentioning

confidence: 98%

“…To deal with these problems, different solving methods have been presented. Salvatore and Trotta presented flat-top window to correct the amplitude error caused by picketfence effect [22]. Yang and Ding gave a window-length changing discrete phase difference correction method to replace interpolation algorithm [23].…”

Section: Introductionmentioning

confidence: 99%

Spectral correction method based on improved flat-top convoluted window for parameter estimation of power harmonic

Song

Zhang

2017

Teh. vjesn.

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“…Similar analysis was performed for the rectangular, Hamming [1] and #at-top [4] windows to identify the best compromise between power variation and overlap in the window-squared function. The results are shown in Table 1.…”

Section: Power}overlap Relationships For Commonly Used Windowsmentioning

confidence: 99%

Window and Overlap Processing Effects on Power Estimates From Spectra

Trethewey

2000

Mechanical Systems and Signal Processing

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“…Choosing an appropriate window can significantly depress the discontinuity caused by incoherent sampling. Up to now, various window functions have been proposed and used for harmonic analysis, including Hanning window [11], Hamming window [7], Blackman window [7], Blackman-Harris window [12], Nuttall window [8], RifeVincent window [13], flat-top window [14] and self-convolution window [15][16][17][18], among others. Each type of window affects the spectrum in a slightly different way and has its own advantage and disadvantage relative to the others.…”

Section: Introductionmentioning

confidence: 99%

Initial-phase Sensitivity Analysis of Harmonic Measurements via Windowed DFT

Song¹,

Wang²,

Cheng³

2014

Transactions on Electrical and Electronic Materials

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When the windowed DFT algorithm is applied in harmonic measurements, the problem of initial-phase sensitivity will be encountered, this has an effect on harmonic amplitude accuracy. In this paper, the origin of initial-phase sensitivity is analyzed and the main factors that influence the level of initial-phase sensitivity are demonstrated. A method of reducing initial-phase sensitivity is proposed to increase the stability of harmonic measurements. We found that initial-phase sensitivity is determined by the side lobe peak level of the window functions when synchronous deviation is fixed. In addition, increasing the length of the time recorded can be used to remove initialphase sensitivity. The correctness and validity of our conclusions have been confirmed through numerical results and field tests.

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Flat-top windows for PWM waveform processing via DFT

Cited by 54 publications

References 0 publications

Spectral correction method based on improved flat-top convoluted window for parameter estimation of power harmonic

Spectral correction method based on improved flat-top convoluted window for parameter estimation of power harmonic

Window and Overlap Processing Effects on Power Estimates From Spectra

Initial-phase Sensitivity Analysis of Harmonic Measurements via Windowed DFT

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