An arrangement for exchanging power

H - Electricity – 02 – J

Patent

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

Patent

CA 2757749

An arrangement for exchanging power, in shunt connection, with a three-phase electric power network (2) com- prises on one hand for each said phase a reactive impedance element (31, 41, 51) and a Voltage Source Converter (32, 42, 52) connected in series with said element, and on the other a control unit (25) configured to control semiconductor devices of turn-off type of said converter for generating a voltage with a fundamental frequency being equal to the fundamental frequency of the voltage of the respective said phase and by that control a flow of reactive power between said arrangement and the respective phase of said electric power network. Each Voltage Sou rce Converter comprises a series connection of switching cells in the form of so-called H-bridges comprisi ng two switch ing elements connected in parallel and each having at least two semiconductor assemblies connected in series. Each switching cell further comprises at least one energy storing capacitor connected in parallel with said switching elements.

L'invention porte sur un agencement d'échange d'énergie, dans un montage en parallèle, avec un réseau électrique triphasé (2), lequel agencement comprend, d'une part, pour chacune desdites phases, un élément d'impédance réactive (31, 41, 51) et un convertisseur de source de tension (32, 42, 52) connecté en série audit élément et, d'autre part, une unité de commande (25) configurée pour commander des dispositifs à semi-conducteur de type à blocage dudit convertisseur, pour générer une tension présentant une fréquence fondamentale égale à la fréquence fondamentale de la tension de ladite phase respective et, par cette commande, un flux de puissance réactive entre ledit agencement et la phase respective dudit réseau électrique. Chaque convertisseur de source de tension comprend un montage en série de cellules de commutation, sous la forme de ponts dits en H comprenant deux éléments de commutation connectés en parallèle et présentant chacun au moins deux ensembles semi-conducteurs connectés en série. Chaque cellule de commutation comprend en outre au moins un condensateur d'accumulation d'énergie connecté en parallèle audit élément de commutation.

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