US 11,994,109 B2
Estimating free-stream inflow at a wind turbine
Pieter M. O. Gebraad, Copenhagen (DK)
Assigned to SIEMENS GAMESA RENEWABLE ENERGY A/S, Brande (DK)
Appl. No. 16/975,166
Filed by Siemens Gamesa Renewable Energy A/S, Brande (DK)
PCT Filed Feb. 15, 2019, PCT No. PCT/EP2019/053780
§ 371(c)(1), (2) Date Aug. 24, 2020,
PCT Pub. No. WO2019/166236, PCT Pub. Date Sep. 6, 2019.
Claims priority of application No. 18159160 (EP), filed on Feb. 28, 2018.
Prior Publication US 2021/0115900 A1, Apr. 22, 2021
Int. Cl. F03D 7/04 (2006.01); F03D 17/00 (2016.01); G01M 9/06 (2006.01)
CPC F03D 7/048 (2013.01) [F03D 17/00 (2016.05); G01M 9/065 (2013.01); F05B 2260/821 (2013.01); F05B 2270/204 (2020.08); F05B 2270/32 (2013.01); F05B 2270/321 (2013.01)] 14 Claims
OG exemplary drawing
 
14. A wind park, comprising:
plural wind turbines including a downstream wind turbine and a plurality of upstream wind turbines that are upstream from the downstream wind turbine; and an arrangement for estimating free-stream inflow communicatively connected to the plural wind turbines, the arrangement comprising:
a server or wind park controller adapted to select, from the plurality of upstream wind turbines, an upstream wind turbine based on a currently determined wind direction; and
a wind measurement system of the selected upstream wind turbine adapted to determine the free-stream inflow at the downstream wind turbine by utilizing free-stream inflow at the upstream wind turbine and correcting it with a time delay calculated from the wind speed, wind direction and a distance between the upstream wind turbine and the downstream wind turbine, wherein the server or wind park controller is configured to control the rotor speed and/or blade pitch of the downstream wind turbine based on the determined free-stream inflow.