A compressor system comprising: a compressor train (100, 200) including two or more compressors (112, 114, 152, 154) connected in series; a control system comprising a primary controller, a performance controller and a load sharing controller; a primary control mechanism (116, 156, 218, 258) controlled by the primary controller that operates with a primary plant parameter; a pressure transducer (113, 115, 153, 155, 213, 215, 253, 255); and a secondary control mechanism (118, 158, 216, 256) that includes the performance controller and the load sharing controller, wherein the load sharing controller is cascaded to the performance controller and is used to drive a setpoint of the performance controller, wherein the secondary control mechanism is controlled by the performance controller such that the secondary control mechanism and the primary control mechanism operate consistently in response to a change in a process variable or a setpoint of the primary control mechanism, wherein the primary and secondary control mechanisms are coupled to the two or more compressors, the performance controller being operable to: identify a process variable of the performance controller, wherein the process variable of the performance controller is an intermediate pressure measured by the pressure transducer between the primary control mechanism and the secondary control mechanism; receive, on a recurrent basis from the load sharing controller, a setpoint for the process variable of the performance controller, wherein the setpoint is determined dynamically during operation of the two or more compressors by the load sharing controller based on a load sharing parameter associated with the two or more compressors; and control the secondary control mechanism based on the setpoint and the process variable of the performance controller. a compressor train (100, 200) including two or more compressors (112, 114, 152, 154) connected in series; a control system comprising a primary controller, a performance controller and a load sharing controller; two or more compressors (112, 114, 152, 154) connected in series; a control system comprising a primary controller, a performance controller and a load sharing controller; a primary control mechanism (116, 156, 218, 258) controlled by the primary controller that operates with a primary plant parameter; a pressure transducer (113, 115, 153, 155, 213, 215, 253, 255); and a secondary control mechanism (118, 158, 216, 256) that includes the performance controller and the load sharing controller, wherein the load sharing controller is cascaded to the performance controller and is used to drive a setpoint of the performance controller, wherein the secondary control mechanism is controlled by the performance controller such that the secondary control mechanism and the primary control mechanism operate consistently in response to a change in a process variable or a setpoint of the primary control mechanism, wherein the primary and secondary control mechanisms are coupled to the two or more compressors, the performance controller being operable to: identify a process variable of the performance controller, wherein the process variable of the performance controller is an intermediate pressure measured by the pressure transducer between the primary control mechanism and the secondary control mechanism; receive, on a recurrent basis from the load sharing controller, a setpoint for the process variable of the performance controller, wherein the setpoint is determined dynamically during operation of the two or more compressors by the load sharing controller based on a load sharing parameter associated with the two or more compressors; and control the secondary control mechanism based on the setpoint and the process variable of the performance controller. a pressure transducer (113, 115, 153, 155, 213, 215, 253, 255); and a secondary control mechanism (118, 158, 216, 256) that includes the performance controller and the load sharing controller, wherein the load sharing controller is cascaded to the performance controller and is used to drive a setpoint of the performance controller, wherein the secondary control mechanism is controlled by the performance controller such that the secondary control mechanism and the primary control mechanism operate consistently in response to a change in a process variable or a setpoint of the primary control mechanism, wherein the primary and secondary control mechanisms are coupled to the two or more compressors, the performance controller being operable to: identify a process variable of the performance controller, wherein the process variable of the performance controller is an intermediate pressure measured by the pressure transducer between the primary control mechanism and the secondary control mechanism; receive, on a recurrent basis from the load sharing controller, a setpoint for the process variable of the performance controller, wherein the setpoint is determined dynamically during operation of the two or more compressors by the load sharing controller based on a load sharing parameter associated with the two or more compressors; and control the secondary control mechanism based on the setpoint and the process variable of the performance controller.