Method for symmetrizing asymmetric faults

H - Electricity – 02 – H

Patent

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H02H 7/122 (2006.01)

Patent

CA 2319267

The invention concerns a method for symmetrizing asymmetric faults occurring within a pull chain comprising a synchronous or asynchronous motor controlled by a two-level or multilevel inverter consisting of static switches using semiconductors such as IGBT or bipolar transistors. The invention is characterised in that it consists in detecting whether the fault connects or may connect a motor phase with the peak or the trough of the inverter power supply, and in short-circuiting only the half of the inverter affected by the fault on the basis of the detection.

La présente invention concerne un procédé de symétrisation d'un défaut asymétrique pouvant survenir au sein d'une chaîne de traction comprenant un moteur synchrone ou asynchrone commandé par un onduleur de tension à deux niveaux ou multi-niveaux formé d'interrupteurs statiques utilisant des semi- conducteurs tels que des IGBT ou transistors bipolaires, caractérisé en ce que l'on détecte si le défaut relie ou risque de relier une phase moteur au point haut ou au point bas de l'alimentation de l'onduleur, et en ce que l'on court- circuite uniquement la moitié de l'onduleur présentant le défaut en fonction du résultat de la détection.

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