公开(公告)号：US20210351589A1

公开(公告)日：2021-11-11

申请号：US17278208

申请日：2019-09-11

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Torsten LUND ,  Ciprian BIRlS ,  Kent TANGE ,  Duy Due DOAN ,  Gert Karmisholt ANDERSEN

IPC: H02J3/01 ,  H02J3/38

Abstract: This invention relates to a method of controlling at least one wind turbine of a plurality of wind turbines connected to an electrical grid at a predefined point in the electrical grid. The wind turbine comprises a DC link connecting a generator side converter to a line side converter, where the line side converter is controlled according to a modulation index requested by a power converter controller. The method comprises determining a harmonic frequency signal indicative of a harmonic frequency value at the predefined point in the electrical grid; determining a deviation between the harmonic frequency signal and a permissible harmonic frequency value; determining a permissible modulation index based on the deviation; comparing the permissible modulation index to the modulation index requested by the power converter controller; and, altering a DC link voltage set-point based on the comparison between the permissible modulation index and the requested modulation index.