US 11,901,734 B2
Grid side inverter system arranged for controlling current injection when a phase locked loop controller is misaligned
John Godsk Nielsen, Hornslet (DK); Torsten Lund, Fredericia (DK); Hamid Soltani, Silkeborg (DK); and Gert Karmisholt Andersen, Hovedgård (DK)
Assigned to VESTAS WIND SYSTEMS A/S, Aarhus N (DK)
Filed by VESTAS WIND SYSTEMS A/S, Aarhus N. (DK)
Filed on Jun. 3, 2022, as Appl. No. 17/832,223.
Claims priority of application No. PA 2021 01136 (DK), filed on Nov. 30, 2021.
Prior Publication US 2023/0344230 A1, Oct. 26, 2023
Int. Cl. H02J 3/16 (2006.01)
CPC H02J 3/16 (2013.01) [H02J 2300/28 (2020.01)] 13 Claims
OG exemplary drawing
 
1. A grid side inverter system comprising:
a grid side inverter;
a phase locked loop controller arranged to determine a phase of a dq-frame dependent on a monitored grid voltage vector in the dq-frame and a reference grid voltage vector in the dq-frame;
a current reference decision controller arranged to generate a reduction of at least one of an active and a reactive current reference, wherein a decision to generate the reduction is based on an electrical parameter relating to a phase difference between a grid phase of the monitored grid voltage vector and the phase of the dq-frame;
a current controller arranged to determine control signals for the grid side inverter for controlling generation of active and reactive power to the grid dependent on the active and reactive current references and monitored active and a reactive grid currents in the dq-frame; and
wherein the generation of the reduction comprises reducing at least one of the active and reactive current references to a predetermined current reference or references.