Patent ID: 8909454

Claim:
A compression system comprising: a compressor; at least one adjustable inlet guide vane (IGV); at least one variable stator vane (VSV) downstream from the at least one IGV, the at least one VSV being adjustable independently of the at least one IGV and the at least one IGV being adjustable independently of the at least one VSV; a compression control system including a controller, the controller including an IGV control unit and a VSV control unit; at least a first device configured to communicate with the compression control system and to provide at least a first compressor property value to the compression control system; at least a second device configured to communicate with the compression control system and to provide at least a second compressor property value to the compression control system, wherein the second compression property value includes an estimated stall margin and an estimated efficiency of the compression system; at least a first summing junction configured to communicate with the IGV control unit, the first summing junction also being configured to communicate with at least one of the first and second devices, and to send, responsive to the at least one of the first and second devices, first output value to the IGV control unit; at least a second summing junction configured to communicate with the VSV control unit, the second summing junction also being configured to communicate with at least one of the first and second devices, and to send, responsive to the at least one of the first and second devices, a second output value to the VSV control unit; responsive to at least one of the first and second devices, IGV position reference command produced by the IGV control unit independently of the VSV control unit; responsive to at least one of the first and second devices, a VSV position reference command produced by the VSV control unit independently of the IGV control unit; and a guide vane positioning system configured to communicate with the controller to produce, responsive to at least the IGV position reference command, an IGV position command, and to produce, responsive to at least the VSV position reference command, a VSV position command.