System for signalling power unbalance between electric power...

H - Electricity – 02 – J

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H02J 5/00 (2006.01) H02J 3/36 (2006.01) H02J 13/00 (2006.01)

Patent

CA 2219336

SYSTEM FOR SIGNALLlNG POWER UNBALANCE BETWEEN ELECTRIC POWER STATIONS A system for transmitting electric power between a direct voltage network and alternating voltage networks through VSC-converters. A first station which transmits electric power is in voltage regulating mode. Switching members at a second station are adapted to be alternatingly switched in and out upon occurrence of a sudden change of power so as to alternatingly connect one of the poles of the direct voltage network through an associated resistance to ground. A ground currellt generated therethrough is detected by a ground current measuring member of the frst station, which is thereby informed about the unbalallce. The first station then takes corrective measures to reduce or eliminate the unbalance.

Système de transmission d'énergie électrique entre un réseau en tension continue et un réseau en tension alternative par l'intermédiaire de convertisseurs de tension à la source. Une première centrale transmet l'énergie électrique en mode de tension régulée. Des éléments de commutation dans une deuxième centrale sont adaptées pour être automatiquement ouverts ou fermés en cas de variation subite d'énergie de manière à pouvoir tour à tour connecter un des pôles du réseau en tension continue par une résistance à la terre connexe. Le courant de terre généré par cette résistance est détecté par un élément de mesure de courant de terre de la première centrale, laquelle est ensuite informée du déséquilibre. La première centrale prend ensuite des mesures correctives pour éliminer sinon réduire le déséquilibre.

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