METHOD FOR CONTROLLING A POWER PLANT

Ambient air is compressed into a compressed ambient gas flow with a main air compressor (12). The compressed ambient gas flow is delivered to a turbine combustor (32) and mixed with a fuel stream (28) and a portion of a recirculated low oxygen content gas flow (50) and is burned to form the recirculated low oxygen content gas flow (50) and drive a turbine (34). A portion of the recirculated low oxygen content gas flow (50) is recirculated from the turbine (34) to the turbine compressor (30). The compressed ambient gas flow rate and the fuel stream flow rate are adjusted to achieve substantially stoichiometric combustion. An excess portion, if any, of the compressed ambient gas flow is vented. A portion of the recirculated low oxygen content gas flow (50) is extracted using an extraction conduit (48).