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A system includes a controller configured to control a semi-closed power cycle system. The controller is configured to receive at least one of a first signal indicative of an oxygen concentration within a first gas flow through a primary compressor, a second signal indicative of power output by the

A system includes a controller configured to control a semi-closed power cycle system. The controller is configured to receive at least one of a first signal indicative of an oxygen concentration within a first gas flow through a primary compressor, a second signal indicative of power output by the semi-closed power cycle system, a third signal indicative of a temperature of a second gas flow through a turbine, and a fourth signal indicative of a mass flow balance within the semi-closed power cycle system. The controller is also configured to adjust at least one of the first gas flow through the primary compressor, a fuel flow into a combustor, a fraction of the first gas flow extracted from the primary compressor, and an air flow through a feed compressor based on the at least one of the first signal, the second signal, the third signal, and the fourth signal.

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1. A system comprising: a controller configured to control a semi-closed power cycle system, wherein the controller is configured to receive at least three signals from a first group comprising a first signal indicative of an oxygen concentration within a first gas flow through a primary compressor,

1. A system comprising: a controller configured to control a semi-closed power cycle system, wherein the controller is configured to receive at least three signals from a first group comprising a first signal indicative of an oxygen concentration within a first gas flow through a primary compressor, a second signal indicative of power output by the semi-closed power cycle system, a third signal indicative of a temperature of a second gas flow through a turbine, and a fourth signal indicative of a mass flow balance within the semi-closed power cycle system, and wherein the controller is configured to adjust at least three parameters from a second group comprising the first gas flow through the primary compressor, a fuel flow into a combustor, a fraction of the first gas flow extracted from the primary compressor, and an air flow through a feed compressor based on the at least three signals. 2. The system of claim 1, wherein the controller is configured to receive the first signal, the second signal, the third signal and the fourth signal, and to adjust the first gas flow through the primary compressor, the fuel flow into the combustor, the fraction of the first gas flow extracted from the primary compressor, and the air flow through the feed compressor based on the first signal, the second signal, the third signal, and the fourth signal. 3. The system of claim 2, wherein the controller is configured to adjust the first gas flow through the primary compressor based on the third signal, to adjust the fuel flow into the combustor based on the second signal, to adjust the fraction of the first gas flow extracted from the primary compressor based on the fourth signal, and to adjust the air flow through the feed compressor based on the first signal. 4. The system of claim 2, wherein the controller is configured to adjust the first gas flow through the primary compressor based on the third signal, to adjust the fuel flow into the combustor based on the first signal, to adjust the fraction of the first gas flow extracted from the primary compressor based on the second signal, and to adjust the air flow through the feed compressor based on the fourth signal. 5. The system of claim 1, wherein the fourth signal indicative of the mass flow balance within the semi-closed power cycle system comprises a signal indicative of a discharge pressure of the primary compressor. 6. The system of claim 1, wherein the controller is configured to receive the first signal, and to adjust the air flow through the feed compressor based on the first signal. 7. The system of claim 1, wherein the controller is configured to adjust the first gas flow through the primary compressor by adjusting a position of inlet guide vanes of the primary compressor. 8. The system of claim 1, wherein the controller is configured to adjust the air flow through the feed compressor by adjusting a position of inlet guide vanes of the feed compressor. 9. The system of claim 1, comprising: the combustor configured to combust a fuel-air mixture;the feed compressor in fluid communication with the combustor and configured to provide the air flow to the combustor;the turbine in fluid communication with the combustor and configured to receive the second gas flow from the combustor; andthe primary compressor in fluid communication with the turbine and configured to compress the first gas flow. 10. The system of claim 1, comprising a heat recovery steam generator configured to extract heat from the second gas flow and to provide the first gas flow to the primary compressor. 11. A system comprising: a combustor configured to combust a fuel-air mixture;a feed compressor in fluid communication with the combustor and configured to provide an air flow to the combustor;a turbine in fluid communication with the combustor and configured to receive a first gas flow from the combustor;a primary compressor in fluid communication with the turbine and configured to receive a second gas flow from the turbine, to compress the second gas flow, and to provide a third gas flow to the turbine, wherein a fraction of the third gas flow is extracted from the primary compressor; anda controller configured to receive a first signal indicative of an oxygen concentration within the third gas flow, and to adjust the air flow to the combustor based on the first signal. 12. The system of claim 11, wherein the first signal indicative of the oxygen concentration within the third gas flow is based on a ratio of the fuel-air mixture. 13. The system of claim 11, wherein the controller is configured to receive a second signal indicative of power output by the turbine, a third signal indicative of a temperature of the first gas flow or the second gas flow, and a fourth signal indicative of a mass flow balance within the system, and wherein the controller is configured to adjust the air flow to the combustor, to adjust the second gas flow into the primary compressor, to adjust a fuel flow into the combustor, and to adjust the fraction of the third gas flow extracted from the primary compressor based on the first signal, the second signal, the third signal, and the fourth signal. 14. The system of claim 13, wherein the controller is configured to adjust the second gas flow into the primary compressor based on the third signal, to adjust the fuel flow into the combustor based on the second signal, to adjust the fraction of the third gas flow extracted from the primary compressor based on the fourth signal, and to adjust the air flow to the combustor based on the first signal. 15. The system of claim 13, wherein the controller is configured to adjust the second gas flow into the primary compressor based on the third signal, to adjust the fuel flow into the combustor based on the first signal, to adjust the fraction of the third gas flow extracted from the primary compressor based on the second signal, and to adjust the air flow to the combustor based on the fourth signal. 16. A method for controlling a semi-closed power cycle system comprising: receiving at least three signals from a first group comprising a first signal indicative of an oxygen concentration within a first gas flow through a primary compressor, a second signal indicative of power output by the semi-closed power cycle system, a third signal indicative of a temperature of a second gas flow through a turbine, and a fourth signal indicative of a mass flow balance within the semi-closed power cycle system; andadjusting at least three parameters from a second group comprising the first gas flow through the primary compressor, a fuel flow into a combustor, a fraction of the first gas flow extracted from the primary compressor, and an air flow through a feed compressor based on the at least three signals. 17. The method of claim 16, comprising receiving the first signal, the second signal, the third signal and the fourth signal, and adjusting the first gas flow through the primary compressor, the fuel flow into the combustor, the fraction of the first gas flow extracted from the primary compressor, and the air flow through the feed compressor based on the first signal, the second signal, the third signal, and the fourth signal. 18. The method of claim 17, comprising adjusting the first gas flow through the primary compressor based on the third signal, adjusting the fuel flow into the combustor based on the second signal, adjusting the fraction of the first gas flow extracted from the primary compressor based on the fourth signal, and adjusting the air flow through the feed compressor based on the first signal. 19. The method of claim 17, comprising adjusting the first gas flow through the primary compressor based on the third signal, adjusting the fuel flow into the combustor based on the first signal, adjusting the fraction of the first gas flow extracted from the primary compressor based on the second signal, and adjusting the air flow through the feed compressor based on the fourth signal. 20. The method of claim 16, comprising receiving the first signal, and adjusting the air flow through the feed compressor based on the first signal.