Method for instantaneously determining rates of distortion...

Details Method for instantaneously determining rates of distortion... Method for instantaneously determining rates of distortion...

G - Physics

01

R

G01R 23/20 (2006.01)

Patent

CA 2655740

Method for instantaneously determining rates of distortion of signals on an ac electrical network, and associated device. The present invention addresses the need for real-time calculation of an instantaneous value of discrete harmonic rate, adapted in particular for an electrical network producing a variable-frequency signal. In a general manner, the invention proposes a method for instantaneously determining rates of distortion on variable-frequency signals, and an associated device, in which a rate of harmonic distortion is calculated over a time window that is as short as possible, corresponding to the duration of a period of the fundamental of a relevant signal. Advantageously, one seeks to precisely determine the value of the frequency of the signal whose DHT is to be calculated, and an iteration is carried out for certain measurements made during a given calculation for the calculation of the DHT on subsequent signals.

Procédé de détermination instantanée de taux de distorsion de signaux sur un réseau électrique alternatif, et dispositif associé. La présente invention répond à un besoin de calcul en temps réel d'une valeur instantanée de taux harmonique discret, adapté notamment à un réseau électrique produisant un signal à fréquence variable. D'une façon générale, l'invention propose un procédé de détermination instantanée de taux de distorsion sur des signaux à fréquence variable, et un dispositif associé, dans lequel on calcule un taux de distorsion harmonique sur une fenêtre temporelle la plus courte possible, correspondant à la durée d'une période du fondamental d'un signal considéré. Avantageusement, on cherche à déterminer précisément la valeur de la fréquence du signal dont le THD est à calculer, et on procède à une itération de certaines mesures réalisées lors d'un calcul donné pour le calcul du THD sur des signaux suivants.

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