Method and arrangement to determine the cell capacitor...

H - Electricity – 02 – M

Patent

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H02M 7/49 (2007.01)

Patent

CA 2759818

An arrangement to determine a cell capacitor voltage value (U dc) of a cell (10") of a multi-cell power converter comprises the cell (10") and a control unit (28). The cell (10") itself comprises four power electronic valves (1-4) interconnected as a full-bridge converter having a first and a second phase leg, where each phase leg comprises a series-connection of two (1, 3; 2, 4) of the four power electronic valves and where the connection point (6; 7) between the two power electronic valves of each phase leg is externally connectable, a cell capacitor (5) being connected in parallel to the first and the second phase legs, and four gate units (16-19), each being connected to a corresponding one of the power electronic valves (1-4) as well as to the control unit (28). Each of the four gate units (16-19) comprises a voltage measurement unit (24-27) adapted to take a continuous voltage measurement across the corresponding power electronic valve, and each of the four gate units (16-19) is adapted to transmit its continuous voltage measurement. The control unit (28) is adapted to receive from each of the four gate units (16-19) its continuous voltage measurement and to determine the cell capacitor voltage value (U dc) based on at least one of these voltage measurements.

L'invention porte sur un agencement pour déterminer une valeur de tension du condensateur (Udc) d'une cellule (10") de convertisseur de puissance à multiples cellules qui comprend la cellule (10") et une unité de commande (28). La cellule (10") comprend elle-même: quatre valves électroniques de puissance (1-4) interconnectées sous la forme d'un convertisseur en pont complet comprenant des première et seconde branches de phase, chaque branche de phase comprenant une connexion en série de deux (1, 3; 2, 4) des quatre valves électroniques de puissance et le point de connexion (6; 7) entre les deux valves électroniques de puissance de chaque branche de phase étant connectable à l'extérieur, un condensateur de cellule (5) étant connecté en parallèle aux première et seconde branches de phase; et quatre unités de grille (16-19), chacune connectée à une valve électronique de puissance correspondante (1-4) ainsi qu'à l'unité de commande (28). Chacune des quatre unités de grille (16-19) comprend une unité de mesure de tension (24-27) conçue pour mesurer une tension continue aux bornes de la valve électronique de puissance correspondante, et chacune des quatre unités de grille (16-19) est conçue pour transmettre sa mesure de tension continue. L'unité de commande (28) est conçue pour recevoir de chacune des quatre unités de grille (16-19) sa mesure de tension continue et pour déterminer la valeur de tension du condensateur de cellule (Udc) sur la base d'au moins une de ces mesures de tension.

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