Systems and method for a waste heat-driven turbocharger system

A system for power generation using a rotary machine including a turbine section, compressor section, and combustor, comprising:

• a heat exchanger positioned in an exhaust passage of the rotary machine;
• a turbocharger system, comprising:
• a low pressure turbocharger stage including at least one low pressure turbocharger, an outlet of a compressor of the at least one low pressure turbocharger fluidly coupled to an inlet of the heat exchanger and an inlet to a turbine of the at least one low pressure turbocharger fluidly coupled to an outlet of the heat exchanger;
• a mid-pressure turbocharger including a mid-pressure turbine driving rotation of a mid-pressure compressor, the mid-pressure compressor fluidly coupled to the outlet of the compressor of the at least one low pressure turbocharger with a first intercooler positioned therebetween and the mid-pressure turbine fluidly coupled to the outlet of the heat exchanger;
• a high pressure turbocharger including a high pressure turbine driving rotation of a high pressure compressor, the high pressure compressor fluidly coupled to an outlet of the mid-pressure compressor with a second intercooler positioned therebetween and the high pressure turbine adapted to receive heated, compressed air from the heat exchanger;
• and
• a turbine backpressure valve positioned in a flow path downstream of the high pressure turbine;
• and
• a controller including instructions stored on memory, than when executed during operation of the turbocharger system, cause the controller to:
• adjust a position of the turbine backpressure valve based on pressure and flow conditions of the turbocharger system.