Abstract

This paper considers the development of a Linear, Time Invariant (LTI) model for centrifugal compressor systems for robust control design. The objective is to obtain a LTI model of the compressor system so that robust controllers can be designed to control the outlet pressure and mass flow. The control variables are the motor armature voltage and the inlet valve position. The approach taken in this paper is to (1) obtain the non-linear, input-output dynamic reactions of the various components (inlet valve, ducts, compressor, nozzle and DC-motor), (2) identify the model parameters and variables (pressure, mass flow, etc.), (3) obtain a linear model of the system, (4) design a controller based on the LTI model and (5) test the designed controller on the non-linear model of the compressor system.

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