公开(公告)号：US20220278604A1

公开(公告)日：2022-09-01

申请号：US17762326

申请日：2020-09-17

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Masoud PARKHOU ,  Lars HELLE ,  Cem Özgür GERÇEK

IPC: H02M1/00 ,  H02J7/00

Abstract: According to embodiments described herein a Modular Multilevel Converter (MMC) is pre-charged by: driving a bypass current from an auxiliary power source through a plurality of bypass switches included in a corresponding plurality of cells; in response to a summed voltage across a plurality of cell capacitors included in the plurality of cells satisfying a drive threshold, driving an insert current through a plurality of insert switches included in the plurality of cells; and in response to a voltage across a Direct Current (DC) link capacitor satisfying a pre-charge threshold when driving the insert current, opening a circuit breaker connecting the auxiliary power source with the plurality of cells and connecting a generator with external power line rails between which the DC link capacitor is connected.