Patent ID: 11901734
Assignee: VESTAS WIND SYSTEMS A/S
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A method for controlling a grid side inverter connected to a power grid during a grid event such as a low voltage grid event, the method comprising:
determining 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;
generating 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 a phase difference between a grid phase of the monitored grid voltage vector and the phase of the dq-frame;
determining 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
generating the reduction further comprising reducing at least one of the active and reactive current references to a predetermined current reference or references.