公开(公告)号：US11901809B2

公开(公告)日：2024-02-13

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: H02M7/483 ,  H02M1/00 ,  H02M1/32 ,  H02J7/00 ,  H02J3/46 ,  H02J7/34 ,  H02M1/36

CPC classification number: H02M1/32 ,  H02J7/0016 ,  H02J7/0019 ,  H02M1/0067 ,  H02M1/0095 ,  H02M7/483 ,  H02M7/4833 ,  H02M7/4835 ,  H02J3/46 ,  H02J7/345 ,  H02J2207/20 ,  H02J2207/50 ,  H02J2300/28 ,  H02M1/36

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.