| US 7,586,206 B2 | ||
| Wind turbine and method for operating same | ||
| Werner Barton, Gescher (Germany); Wilhelm Janssen, Saterland (Germany); Robert Delmerico, Clifton Park, N.Y. (US); and Nicholas W. Miller, Delmar, N.Y. (US) | ||
| Assigned to General Electric Company, Schenectady, N.Y. (US) | ||
| Filed on Dec. 30, 2008, as Appl. No. 12/346,248. | ||
| Application 12/346248 is a division of application No. 11/238473, filed on Sep. 29, 2005, granted, now 7,504,738. | ||
| Prior Publication US 2009/0108583 A1, Apr. 30, 2009 | ||
| Int. Cl. F03B 13/10 (2006.01) | ||
| U.S. Cl. 290—44 [290/43; 290/54; 290/55] | 8 Claims |
| 1. A method for operating a wind turbine, said method comprising the steps of:
(a) determining an actual torque-speed curve of a generator of the wind turbine;
(b) determining an actual grid frequency;
(c) determining a shifted torque-speed curve in response to the determined actual grid frequency if the determined actual
grid frequency is higher than a predetermined upper frequency limit or lower than a predetermined lower frequency limit, wherein
the shifted torque-speed curve is determined such that an increase in the rotor voltage of the generator rotor is counteracted
when shifting the actual torque-speed curve to the shifted torque-speed curve; and
(d) shifting the actual torque-speed curve of the generator to the shifted torque-speed curve determined in step (c).
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