Abstract
An important issue in plantwide control is to find the degrees of freedom that may be used for online optimization. First, it determines the degrees of freedom available for solving the optimization problem. However, more importantly in terms of operation it determines the number of steady-state controlled variables that need to be selected. Optimal operation is normally implemented by keeping the selected variables at constant setpoints. For both mode I (given feed) and mode II (maximum feed), operating close to surge and at maximum compressor speed is optimal for the nominal operating point and in some of the disturbance regions. Note that the selection of controlled variables is equally important if one uses a model-based control structure such as model predictive control (MPC).
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