POWER GENERATION SYSTEM HAVING COMPRESSOR CREATING EXCESS AIR FLOW AND TURBO-EXPANDER FOR COOLING INLET AIR

A power generation system (100) may include: a first gas turbine system (102) including a first turbine component (104), a first integral compressor (106) and a first combustor (108) to which air from the first integral compressor (106) and fuel are supplied. The first integral compressor (106) has a flow capacity greater than an intake capacity of the first combustor (108) and/or the first turbine component (104), creating an excess air flow (200). A second gas turbine system (140) may include similar components to the first except but without excess capacity in its compressor. A turbo-expander (252) may be operatively coupled to the second gas turbine system (140). Control valves may control flow of the excess air flow (200) from the first gas turbine system (102) to at least one of the second gas turbine system (140) and the turbo-expander (252), and flow of a discharge (210, 272) of the turbo-expander (252) to an inlet of at least one of the first integral compressor (106) and the second compressor (146).