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1. (WO2017035325) TECHNIQUES FOR DETERMINING YAW MISALIGNMENT OF A WIND TURBINE AND SYSTEM AND METHOD USING THE SAME

Pub. No.:    WO/2017/035325    International Application No.:    PCT/US2016/048629
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Fri Aug 26 01:59:59 CEST 2016
IPC: F03D 1/00
F03D 7/00
F03D 7/02
F03D 7/04
F03D 17/00
Applicants: NRG SYSTEMS INC.
Inventors: NOSTRAND, Thomas J.
ANGOLA, Enrique D.
ZHU, Junda
Title: TECHNIQUES FOR DETERMINING YAW MISALIGNMENT OF A WIND TURBINE AND SYSTEM AND METHOD USING THE SAME
Abstract:
Techniques are disclosed for actively determining a yaw misalignment value for a wind turbine based in part on identifying the position of a tower shadow effect that occurs the moment a blade passes in front of the wind turbine tower. The present disclosure has identified that when a wind turbine is properly aligned with the wind, tower shadowing occurs the moment when a blade is substantially in front of the tower (e.g., 6 o'clock position). A wind turbine control system consistent with the present disclosure correlates incidences of tower shadowing effect with blade position at the moment the tower shadowing occurs, and therefore may identify whether tower shadowing occurs substantially directly in front of the tower, and thus, the wind turbine is properly aligned with oncoming wind, or whether tower shadowing occurs prior to or after passing through the front of the tower, thus indicating a yaw misalignment.