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

Claim 10:
11. An electric power generating system comprising:
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;
a power source; 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.