APPARENT POWER ESTIMATION BY INTERPOLATION OF THE PRODUCT OF THE DFT COEFFICIENTS

Jalen Štremfelj, Dušan Agrež,

Abstract

This paper describes the possibility of estimating the apparent power of a signal component using the interpolation of the products of amplitude discrete Fourier transform (DFT) coefficients. As with energy-based approach for the amplitude square estimation of the onechannel signal, the apparent power in the two-channel case can be estimated with the multiplied amplitude DFT coefficients around the component peak and a suitable interpolation algorithm. The use of the Hann window with well known frequency spectrum and the largest local amplitude DFT coefficients give lower systematic errors than the energy-based approach, although the frequency has to be estimated first.

Keywords

non-coherent sampling, apparent power estimation, leakage effect, interpolated DFT, Hann window

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IMEKO-WC-2012-TC4-O21.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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