Patent ID: 8474271

Claim:
A gas turbine system, comprising: a compressor oversized in airflow capacity configured to supply compressed air for use during combustion in the gas turbine; one or more variable blade rows configured to control the airflow rate into said compressor, said one or more variable blade rows being movable between a first position wherein said one or more variable blade rows provide a maximum airflow rate into said compressor and a second position wherein said one or more variable blade rows provide a decreased airflow rate into said compressor; a controller configured to operate the gas turbine system in a nominal mode, a controlled output mode, and a frequency compensation mode, the controller configured to control the position of said one or more variable blade rows according to a nominal variable blade row position schedule when the gas turbine system is operated in the nominal mode, said nominal variable blade row position schedule specifying nominal positions for said one or more variable blade rows such that said one or more variable blade rows provide a nominal airflow rate into said compressor, the nominal airflow rate being less than the maximum airflow rate; wherein pursuant to an operator request, said gas turbine system is operable in either the controlled output mode or the frequency compensation mode, said controller configured to adjust the position of the one or more variable blade rows from the nominal positions specified in the nominal variable blade row schedule to operate said gas turbine system in the controlled output mode or in the frequency compensation mode, wherein when said gas turbine is operated in the controlled output mode, said controller is configured to adjust the position of said one or more variable blade rows to increase or decrease airflow into said compressor to achieve a power output requested by an operator.