System and method for controlling a variable speed drive

H - Electricity – 02 – M

Patent

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H02M 5/458 (2006.01) H02M 7/48 (2006.01)

Patent

CA 2562051

A variable speed drive (104) is provided having a converter (202) to convert an AC voltage to a DC voltage, a DC link (204) to filter and store energy from the converter (202), and a plurality of inverters (206). Each inverter (206) is configured to convert a DC voltage to an AC voltage and is electrically connected in parallel to the DC link (204). An interleaved pulse width modulation control technique is used to control the operation of the plurality of inverters (206) and possibly the converter (202) to lower the RMS ripple current in the DC link (204).

L'invention concerne un variateur de vitesse (104) pourvu d'un convertisseur (202) destiné à convertir une tension c.a. en une tension c.c., d'une liaison c.c. (204) destinée à filtrer et stocker l'énergie provenant du convertisseur (202), et d'une pluralité d'onduleurs (206). Chaque onduleur (206) est conçu pour convertir une tension c.c. en une tension c.a. et est connecté électriquement en parallèle à la liaison c.c. (204). Une technique de commande de la modulation de la largeur d'impulsion entrelacée est utilisée pour commander le fonctionnement de la pluralité d'onduleurs (206) et, probablement, le convertisseur (202) en vue d'abaisser le courant ondulatoire de valeur efficace dans la liaison c.c. (204).

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