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

Claim 5:
6. The method of claim 4, wherein determining the virtual voltage based on the virtual reactance value comprises:
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) an op frame that is stationary so as to determine current components;
determining a first virtual voltage component of the virtual voltage by subtracting a product of the virtual reactance value and a second component of the current components from a product of the virtual resistance value and a first component of the current components; and
determining a second virtual voltage component of the virtual voltage by subtracting a product of the virtual reactance value and the first component of the current components from a product of the virtual resistance value and the second component of the current components, and
wherein the first virtual voltage component and the second virtual voltage component form the virtual voltage.