Prime-mover dynamo plants – Turbogenerators
Reexamination Certificate
2006-10-12
2009-10-27
Ponomarenko, Nicholas (Department: 2839)
Prime-mover dynamo plants
Turbogenerators
C290S002000, C290S00400D
Reexamination Certificate
active
07608938
ABSTRACT:
Methods and apparatus for operating a combined-cycle power system are provided. The method includes operating the steam turbine, the combustion turbine, and the steam source at steady state operating conditions. Upon sensing a grid frequency deviation away from the standardized grid frequency value, determining a current thermal energy capacity of the steam source, determining a rate of frequency recovery available using the current thermal energy capacity of the steam source and a predetermined rate of change of the at least one steam turbine control valve, if the determined rate of frequency recovery available is greater than the grid frequency deviation, mitigating the frequency deviation using the current thermal energy capacity, if the determined rate of frequency recovery available is less than the grid frequency deviation then mitigating the frequency deviation using the current thermal energy capacity substantially simultaneously with a power level increase of the combustion turbine.
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EP Search Report, Application No. EP07254051 (Mar. 3, 2008).
Andrew Philip Lynn
Ford John Edward
Melsert Timothy Andrew
Armstrong Teasdale LLP
General Electric Company
Ponomarenko Nicholas
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