Method and apparatus for direct torque control of a...

H - Electricity – 02 – P

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H02P 23/00 (2006.01)

Patent

CA 2199080

A method and an apparatus for direct torque control are specified for a three-phase machine fed via a harmonic filter, which method manages as far as possible without any major adaptation to already known DTC methods and DTC apparatuses. In addition, the oscillations caused by the filter are intended to be damped effectively. This is achieved in that a current flowing through the filter and/or a filter output voltage are/is measured, and the reference flux value and the reference torque value are corrected on the basis of the measured voltage and/or of the measured current. The correction comprises a transformation of the filter output voltage into a first component at right angles to a stator flux and into a second component parallel to the stator flux, as well as a reduction in the reference torque and flux values in proportion to the oscillating part of the filter output voltage.

La présente invention vise une méthode et un appareil pour la commande directe de couple pour une machine triphasée alimentée via un filtre d'harmonique, laquelle méthode peut être mise en oeuvre sans qu'il soit nécessaire d'adapter de façon importante les méthodes et les appareils déjà connus de commande directe de couple. L'invention prévoit en outre l'amortissement efficace des oscillations causées par le filtre. Elle consiste à mesurer un courant passant à travers le filtre et/ou une tension de sortie du filtre, et à corriger la valeur du flux de référence et la valeur du couple de référence d'après la tension mesurée et/ou le courant mesuré. La correction comprend une transformation de la tension de sortie du filtre en une première composante perpendiculaire au flux statorique et en une deuxième composante parallèle au flux statorique, de même que la réduction des valeurs de référence du flux et du couple, proportionnelle à la partie oscillante de la tension de sortie du filtre.

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