Fault protection in voltage source converters with redundant...

H - Electricity – 02 – M

Patent

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Details

H02M 7/797 (2006.01) H02M 1/32 (2007.01) H01H 39/00 (2006.01)

Patent

CA 2749042

A Voltage Source Converter has a series connection of switching assemblies, in which each switching assembly (7) has an electrically conducting plate member (30) carrying a plurality of semiconductor chips (31) each having at least a semiconductor device of turn-off and a free-wheeling diode connected in parallel therewith. Said chips are connected in parallel with each other by each being connected by at least one individual conductor member (35, 36) to a said plate member of an adjacent switching assembly of said series connection. Each switching assembly has a mechanical switch (39) configured to be open under normal operation of the switching assembly and configured to enable connection of said plate member of the switching assembly to the plate member of an adjacent switching assembly for bypassing said semiconductor chips of the switching assembly to which the mechanical switch belongs in the case of occurrence of a short circuit current through a semiconductor chip of the switching assembly.

Un convertisseur de source de tension comprend une connexion série d'ensembles de commutation, chaque ensemble de commutation (7) comprenant un élément formant plaque électroconducteur (30) portant une pluralité de puces semi-conductrices (31) qui ont chacune au moins un dispositif semi-conducteur d'arrêt et une diode libre connectée en parallèle à celui-ci. Lesdites puces sont connectées en parallèle les unes aux autres, chacune étant connectée par au moins un élément conducteur individuel (35, 36) à un dit élément formant plaque d'un ensemble de commutation adjacent de ladite connexion série. Chaque ensemble de commutation comprend un commutateur mécanique (39) qui est configuré de façon à être ouvert dans des conditions normales de fonctionnement de l'ensemble de commutation et qui est configuré de façon à permettre la connexion dudit élément formant plaque de l'ensemble de commutation à l'élément formant plaque d'un ensemble de commutation adjacent pour éviter lesdites puces semi-conductrices de l'ensemble de commutation auquel appartient le commutateur mécanique, dans le cas où un courant de court-circuit serait produit via une puce semi-conductrice de l'ensemble de commutation.

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