David M Stuebner

US Patent:

20120306458, Dec 6, 2012

Filed:

Jun 1, 2011

Appl. No.:

13/150726

Inventors:

James Michael Fogarty - Schenectady NY, US
John Noel Cunningham - Roanoke VA, US
Gary Edward Gottung - Clifton Park NY, US
David Mark Stuebner - Delanson NY, US

Assignee:

GENERAL ELECTRIC COMPANY - Schenectady NY

International Classification:

H02P 9/02

US Classification:

322 32

Abstract:

An approach for converting a synchronous generator to a synchronous condenser is disclosed. In one aspect, a variable frequency driver is used to provide a starting power source to accelerate a synchronous generator decoupled from a turbine to an operational speed to act as a synchronous condenser. In another aspect, the synchronous condenser can be recoupled back to the turbine to form the synchronous generator.

US Patent:

62508776, Jun 26, 2001

Filed:

Jul 19, 2000

Appl. No.:

9/619539

Inventors:

Bernd Artur Karl Westphal - Clifton Park NY
David Mark Stuebner - Delanson NY

Assignee:

General Electric Co. - Schenectady NY

International Classification:

F01B 2500

US Classification:

415 17

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.