Supercharged Combined Cycle System with Air-Flow Bypass

A system and method for supercharging a combined cycle system (11) includes a forced draft fan (30) providing a variable air flow. At least a first portion of the air flow is directed to a compressor (15) and a second portion of the airflow is diverted to a heat recovery steam generator (23). A control system (39) controls the airflows provided to the compressor (15) and the heat recovery steam generator (23). The system allows a combined cycle system (11) to be operated at a desired operating state by controlling the flow of air from the forced draft fan (30) to the compressor (15) and the heat recovery steam generator (23).