METHOD FOR ENERGIZING A MODULAR MULTILEVEL CONVERTER

원문 (중국어)

The present disclosure relates to a method for energizing a modular multilevel converter () comprising converter valves (), each converter valve having a plurality of interconnected cells (), wherein each cell comprises a plurality of power electronic switches () in a full-bridge arrangement, a chargeable element (), and a plurality of gate drive units (), one gate drive unit for each power electronic switch. The method includes: providing power to the modular multilevel converter from an external power supply (S); powering the cells, thereby charging the chargeable elements of the cells (S); generating, when a cell voltage caused by said charging exceeds a first threshold voltage level, a cell sub-ready signal for that cell (S); generating, when at least a predetermined minimum number of cells have generated the sub-ready signal, a sub-ready_for_operation signal (S); and running a deblocking sequence comprising closing a first power electronic switch () in all cells to electrically configure the cells to be continuously charged as a half-bridge cells, and keep the first power electronic switch closed until the cell voltage has reached a converter operable voltage, which is higher than a second threshold voltage ().