An arrangement for exchanging power

H - Electricity – 02 – J

Patent

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Details

H02J 3/18 (2006.01) H02M 7/49 (2007.01) H02J 3/26 (2006.01)

Patent

CA 2757750

An arrangement for exchanging power with a three-phase electric power network (1 ) comprises a Voltage Source Converter (6) having three phase legs (7-9) with each a series connection of switching cells (10). The three phase legs are interconnected in a neutral point (22) by forming a wye-connection. The arrangement also comprises a de-vice (27) connected to the neutral point (22) of the converter and configured to provide a current path for a zero-sequence current. A control unit (25) is configured to calculate a value for amplitude and phase position for a zero-sequence current for which, when added to said three phase legs upon generation of a negative-sequence current, the resulting ener-gy stored in energy storing capacitors (19) in each phase leg will be constant and to con-trol semiconductor devices of said switching cells to add such a zero-sequence current to the currents of each phase leg of the converter.

L'invention porte sur un agencement d'échange d'énergie avec un réseau électrique triphasé (1), lequel agencement comprend un convertisseur de source de tension (6) comprenant trois branches de phase (7-9) comprenant chacune un montage en série de cellules de commutation (10). Les trois branches de phase sont interconnectées dans un point neutre (22) par formation d'une connexion en y. L'agencement comprend également un dispositif (27) connecté au point neutre (22) du convertisseur et configuré pour fournir un chemin de courant pour un courant homopolaire. Une unité de commande (25) est configurée pour calculer une valeur d'amplitude et de position de phase pour un courant homopolaire pour lequel, lorsqu'il est ajouté auxdites trois branches de phase lors de la génération d'un courant inverse, l'énergie résultante emmagasinée dans des condensateurs de stockage d'énergie (19) dans chaque branche de phase sera constante et pour commander des dispositifs à semi-conducteurs desdites cellules de commutation pour ajouter un tel courant homopolaire aux courants de chaque branche de phase du convertisseur.

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