SYSTEM AND METHODS FOR IMPROVING COMBUSTION TURBINE TURNDOWN CAPABILITY

Combustion turbine control systems are configured to operate combustion turbine systems (10) in partial or no load while meeting emission targets. The combustion turbine system (10) includes a combustion turbine, a combustion turbine controller and sensors, a catalyst assembly, and/or other relevant equipment. Based on given operating constraints, such as load conditions and emission regulations, the combustion turbine controller may execute corresponding actions to control certain gas concentrations and/or gas mass flows in the exhaust gases in compliance with emission regulations. The corresponding actions may include: controlling fuel and/or diluent injection(s) to combustor(s) (16) to control combustion (e.g., combustion temperature) to manage combustion gas contents exiting from the combustor (16), controlling compressor bleed valve(s) to control the combustion temperature, controlling the catalyst assembly to process exhaust gases to be released into the environment, or a combination thereof.