公开(公告)号：US20180112647A1

公开(公告)日：2018-04-26

申请号：US15572256

申请日：2016-06-08

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Tusitha ABEYASEKERA ,  Duy Duc DOAN ,  Gert Karmisholt ANDERSEN ,  Lars HELLE ,  Søren ANDERSEN ,  Tune Pedersen ,  John Godsk Nielen

IPC: F03D7/02 ,  H02J3/38 ,  H02H7/26 ,  H02J3/42

Abstract: A method, converter arrangement, and controller are disclosed for connecting an output of a converter with an electrical grid to control inrush currents into a grid filter assembly connected with the output of the converter, the electrical grid carrying an alternating current (AC) signal having one or more phases. The method includes determining a voltage of the AC signal and operating, after pre-charging a direct current (DC) link of the converter to a predetermined voltage, the converter using open-loop voltage control to produce an AC output signal that substantially matches the AC signal of the electrical grid. The open-loop voltage control is based on the determined voltage of the AC signal. The method further includes closing, after a predetermined amount of time of operating the converter using the open-loop voltage control, a switching device to thereby connect the output of the converter with the electrical grid.