Power Plant and Control Method

Ambient air is compressed into a compressed ambient gas flow (26) with a main air compressor (12). The compressed ambient gas flow (26) having a compressed ambient gas flow rate is delivered to a turbine combustor (32) and mixed with a fuel stream (28) having a fuel stream flow rate and a portion of a recirculated gas flow (50) to form a combustible mixture. The combustible mixture is burned and forms the recirculated gas flow (50) that drives a turbine (34). The recirculated gas flow (50) is recirculated from the turbine (34) to the turbine compressor (30) using a recirculation loop (52). At least one emission level is measured by a first emission sensor (53) in the recirculated gas flow (50) and a first control signal is generated. The fuel stream flow rate is adjusted based on the at least a first control signal to achieve substantially stoichiometric combustion.