US 12,031,523 B2
Wind turbine with virtual synchronous generator with damping control
Esmaeil Ebrahimzadehveshareh, Aalborg (DK); Torsten Lund, Fredericia (DK); Mark Faber, Risskov (DK); Poul Brandt Christensen, Ry (DK); and Gert Karmisholt Andersen, Hovedgård (DK)
Assigned to VESTAS WIND SYSTEMS A/S, Aarhus N (DK)
Appl. No. 17/787,911
Filed by VESTAS WIND SYSTEMS A/S, Aarhus N. (DK)
PCT Filed Dec. 18, 2020, PCT No. PCT/DK2020/050396
§ 371(c)(1), (2) Date Jun. 21, 2022,
PCT Pub. No. WO2021/129914, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. PA 2019 01552 (DK), filed on Dec. 23, 2019.
Prior Publication US 2023/0050448 A1, Feb. 16, 2023
Int. Cl. F03D 7/00 (2006.01); F03D 7/02 (2006.01); H02P 23/04 (2006.01)
CPC F03D 7/0272 (2013.01) [H02P 23/04 (2013.01); F05B 2270/327 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for damping mechanical oscillations of a wind turbine, the wind turbine comprises a drive train driven by a rotor, a generator driven by the drive train, a machine side converter, and a line side converter arranged to supply power to a grid, the method comprising:
obtaining a speed signal representing a rotation speed of the generator;
determining a drive train damping power-signal based on the speed signal;
determining a power deviation based on a difference between a power reference for a desired power output of the wind turbine, a damping power and a grid power supplied by the line side converter to the grid;
determining a virtual synchronous machine rotational speed and/or a virtual synchronous machine angle based on the power deviation so that a derivative of the virtual synchronous machine rotational speed is indicative of the power deviation;
providing a voltage reference for a voltage amplitude or a reactive power to be generated by the line side converter;
determining a converter reference for controlling the line side converter to generate a desired active power based on the virtual synchronous machine angle and the voltage reference; and
controlling the line side converter based on the converter reference.