Patent Number: 6,250,877

Title: Steam turbine controller having method and apparatus for providing variable frequency regulation

Abstract: In a preferred embodiment, the invention relates to a steam turbine having a speed-loop droop governor with two load-frequency error gains (droops). The first gain (fast change) may be a conventional high gain that is used for power loads that have a constant frequency. When using only the first gain, the high rate of the first gain causes the droop governor to shut off steam to the turbine if the speed of the turbine drifts above a narrow speed range centered on the rated speed set-point. The second gain (slow change) is a low gain that causes the droop governor to tolerate a wide range of turbine speeds about the rated speed set-point.

Inventors: Westphal; Bernd Artur Karl (Clifton Park, NY), Stuebner; David Mark (Delanson, NY)

Assignee: General Electric Co.

International Classification: F01D 17/06 (20060101); F01D 17/00 (20060101); F01D 17/24 (20060101); G05B 13/02 (20060101); F01B 025/00 ()

Expiration Date: 06/26/2018