Process for determining the harmonic oscillations of the...

G - Physics – 01 – R

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G01R 23/02 (2006.01) G01R 23/16 (2006.01)

Patent

CA 2191742

The present invention relates to a process for determining harmonic oscillations of a fundamental component of an electrical signal, wherein the signal is sampled with a sampling frequency corresponding to a multiple of the fundamental component's frequency. The sampled values of the signal are subjected, after analog-to-digital conversion, to a discrete Fourier transformation to determine the harmonic oscillations. The sampling is performed with a non-integer multiple of the frequency of the fundamental component and the discrete Fourier transformation is performed while the frequency resolution is increased over several periods of the fundamental component to determine the harmonic oscillations.

Un procédé permet de déterminer les vibrations harmoniques de la composante fondamentale d'un signal électrique. A cet effet, le signal est balayé à une fréquence de balayage qui correspond à un multiple de la fréquence de la composante fondamentale, et les valeurs analogiques de balayage sont converties en valeurs numériques, puis soumises à une transformation discrète de Fourier pour la détermination des vibrations harmoniques. Afin de pouvoir mettre en oeuvre un tel procédé aussi aisément que possible, la fréquence de balayage représente un multiple non entier (N') de la fréquence (fgr) de la composante fondamentale et la transformation discrète de Fourier est effectuée en même temps que la résolution de la fréquence est accrue sur plusieurs périodes de la composante fondamentale pour la détermination des vibrations harmoniques (H2 à H16).

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