US 12,237,687 B2
Wind turbine power generation comprising an AC-DC-AC converter and a transformer with a tap changer
Bo Sun, Aarhus N (DK); Ciprian Biris, Hinnerup (DK); Catalin Gabriel Dincan, Aalborg Øst (DK); and Philip Carne Kjær, Aarhus C (DK)
Assigned to VESTAS WIND SYSTEMS A/S, Aarhus N (DK)
Appl. No. 17/794,226
Filed by VESTAS WIND SYSTEMS A/S, Aarhus N. (DK)
PCT Filed Jan. 19, 2021, PCT No. PCT/DK2021/050015
§ 371(c)(1), (2) Date Jul. 20, 2022,
PCT Pub. No. WO2021/148095, PCT Pub. Date Jul. 29, 2021.
Claims priority of application No. PA 2020 70042 (DK), filed on Jan. 21, 2020.
Prior Publication US 2023/0133674 A1, May 4, 2023
Int. Cl. H02J 3/38 (2006.01); H01F 29/04 (2006.01); H02J 3/00 (2006.01); H02M 1/00 (2006.01)
CPC H02J 3/381 (2013.01) [H01F 29/04 (2013.01); H02J 3/0012 (2020.01); H02J 3/00125 (2020.01); H02J 3/388 (2020.01); H02M 1/0025 (2021.05); H02J 2203/10 (2020.01); H02J 2300/28 (2020.01)] 11 Claims
OG exemplary drawing
 
1. A method of operating a power generating system for a wind turbine connected to an electrical grid, the power generating system comprising a power generator, a converter, a transformer and a tap changer, the method comprising:
when operating the power generating system in a grid-forming configuration:
operating the converter to provide a converter voltage reference to maintain a grid voltage in a predetermined voltage range; and
monitoring a signal for detecting a voltage of the electrical grid which requires an increase in output voltage from the power generating system in order to maintain the grid voltage within the predetermined voltage range;
operating the tap changer to tap-up the transformer to provide at least part of the voltage increase required to maintain the grid voltage within the predetermined voltage range; and
upon determining that the tap changer is out of a neutral position, updating the converter voltage reference based on a position of the tap changer.