Patent ID: 11863112
Assignee: VESTAS WIND SYSTEMS A/S
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 12:
13. The method of claim 1, wherein obtaining the current magnitude of the current supplied by the line side converter to the power grid based on the grid current comprises:
selecting one of a first current magnitude and a second current magnitude as the current magnitude of the current supplied by the line side converter to the power grid,
the first current magnitude being determined by:
transforming current signals of the grid current from a measurement frame to: i) a DQ frame that rotates with a virtual synchronous angular frequency; or ii) a non-rotating frame so as to determine current components; and
calculating a square root of squares of the current components, the first current magnitude is set as the square root of the squares, and

the second current magnitude being determined by:
calculating a current magnitude for each of the current signals of the grid current within a period; and
determining a maximum of the current magnitudes, the second current magnitude is set as the maximum of the current magnitudes.