Method in a cascaded two-level converter, control device and...

H - Electricity – 02 – M

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H02M 7/797 (2006.01) H02M 1/12 (2006.01)

Patent

CA 2751492

The invention relates to a method (20) for providing a switching order signal to a cell (2 1..., 2n) of a cascaded two-level converter (1). The (2 1..., 2n) comprises a capacitor parallel-connected with two series-connected semiconductor devices (3a, 3b). The cascaded two-level converter comprises two or more of the cells cascade connected and arranged in a phase, divided into two phase arms (7, 8), between a first pole (4a) and a second pole (4b) of a direct voltage side. The method (20) is characterized by the steps of : measuring (21) voltages of the capacitor of the cell; calculating (22) a compensated voltage reference based on a voltage reference and the measured voltages of the capacitors, wherein the voltage reference corresponds to a desired ac current to be output on an ac-side; using the compensated voltage reference (r) to calculate a switching order signal, and providing the switching order signal to the cells (2 1..., 2n).

L'invention porte sur un procédé (20) pour fournir un signal d'ordre de commutation à une cellule (21, 2n) d'un convertisseur à deux niveaux en cascade (1). La cellule (21, 2n) comprend un condensateur connecté en parallèle à deux dispositifs à semi-conducteurs connectés en série (3a, 3b). Le convertisseur à deux niveaux en cascade comprend deux ou plus des cellules connectées en cascade et agencées dans une phase, divisée en deux bras de phase (7, 8), entre un premier pôle (4a) et un second pôle (4b) d'un côté tension continue. Le procédé (20) est caractérisé par les étapes consistant à : mesurer (21) des tensions du condensateur de la cellule; calculer (22) une référence de tension compensée sur la base d'une référence de tension et des tensions mesurées des condensateurs, la référence de tension correspondant à un courant alternatif souhaité devant être délivré d'un côté courant alternatif; utiliser la référence de tension compensée (r) pour calculer un signal d'ordre de commutation, et fournir le signal d'ordre de commutation aux cellules (21, 2n).

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