US 11,815,067 B2
Operation of a wind turbine during start-up to reduce limit cycles
Fabio Spagnolo, Aarhus C (DK); Julio Xavier Vianna Neto, Aarhus N (DK); Karthik Vasudevan, Viby J (DK); Naga Srinivas Kamarajugadda, Vishakapatnam (IN); and Fabio Caponetti, Åbyhøj (DK)
Assigned to VESTAS WIND SYSTEMS A/S, Aarhus N (DK)
Filed by VESTAS WIND SYSTEMS A/S, Aarhus N. (DK)
Filed on Jun. 17, 2022, as Appl. No. 17/843,522.
Claims priority of application No. PA 2021 70306 (DK), filed on Jun. 17, 2021.
Prior Publication US 2022/0403819 A1, Dec. 22, 2022
Int. Cl. F03D 7/02 (2006.01)
CPC F03D 7/026 (2013.01) [F05B 2270/32 (2013.01); F05B 2270/327 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for operating a wind turbine during start-up from a non-producing operation mode to a power producing operation mode, the method comprising:
a) setting a nominal cut-in value of a first operational parameter and a connection cut-in value of a second operational parameter of the wind turbine;
b) monitoring the first operational parameter;
c) initiating start-up of the wind turbine when the monitored first operational parameter is higher than the nominal cut-in value;
d) monitoring the second operational parameter;
e) detecting a cut-in transition if the value of the second operational parameter is not reaching the connection cut-in value within a start-up time period or the first operational parameter falls below the nominal cut-in value;
f) detecting a cut-in limit cycle of the wind turbine if more than a threshold number of counted cut-in transitions has been detected, and if a cut-in limit cycle is detected, increase the nominal cut-in value; and
g) repeating steps b)-f) until the second operational parameter reaches the connection cut-in value.