Horizontal axis wind turbine and idling method of the same

Details Horizontal axis wind turbine and idling method of the same Horizontal axis wind turbine and idling method of the same

2005-06-29

2008-11-04

Nguyen, Ninh H (Department: 3745)

Rotary kinetic fluid motors or pumps

With means for controlling casing or flow guiding means in...

Natural fluid current force responsive

C415S004500, C415S908000, C416S001000, C416S040000, C416S155000

Reexamination Certificate

active

07445420

ABSTRACT:
A horizontal axis wind turbine includes: a rotor having a hub and at least two or more blades; a nacelle for pivotally supporting the rotor through a rotating shaft connected to the hub; a tower for supporting the nacelle; and an independent pitch control unit capable of independently controlling pitch angles of the blades, respectively, wherein the independent pitch control units control the pitch angles so that all the blades are made in a full feather position in case of a wind speed not less than a predetermined value, and subsequently controls the pitch angles of the respective blades so as to be sequentially reversed one by one, and further subsequently, carries out control so that the wind turbine idles in an all-blade negative feather position where the pitch angles of all the blades are reversed.

REFERENCES:
patent: 4474531 (1984-10-01), Weiss
patent: 5289041 (1994-02-01), Holley
patent: 6441507 (2002-08-01), Deering et al.
Masaaki Shibata and Yoshiyuki Hayashi “New concept for design load reduction (Sekkei kajuu teigen no tame no shinkonseputo”, Wind Energy Utilization Symposium Nov. 20, 2003, p. 225-227.

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