公开(公告)号：US10236687B2

公开(公告)日：2019-03-19

申请号：US15566025

申请日：2016-04-11

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： John Godsk Nielsen ,  Søren Andersen ,  Lars Helle ,  Duy Duc Doan

IPC: H02J3/34 ,  H02J3/36 ,  H02J3/38 ,  H02M5/42 ,  H02M1/32

Abstract: In a full-scale converter system both the grid-side inverter unit and the generator-side inverter unit have a series convection of parallel inverters and form a generator-side and grid-side voltage-center-point at a voltage level between those of the inverters connected in series. The voltage-center-points are electrically connected by a center-line conductor that has a cross-section between 30% and 70% of that of a positive or negative potential conductor. The converter system continues conversion operation in the event of a fault in an inverter of a first converter-string, with non-faulty inverters of the converter system, as the center-line conductor is dimensioned by said cross-section to carry a compensation current resulting from an unbalanced active power-output.