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Compact separators are increasingly used for subsea separation of hydrocarbons, because of their low weight and low cost. A problem is their small volume, which makes them very sensitive to flow variations. This can degrade separation performance, which in turn can cause operational problems and economic loss. Improved control can increase robustness and therefore, the focus of this paper is to derive...
The aim of this paper is to present analytic rules for PID controller tuning that are simple and still result in good closed-loop behavior. The starting point has been the IMC-PID tuning rules that have achieved widespread industrial acceptance. The rule for the integral term has been modified to improve disturbance rejection for integrating processes. Furthermore, rather than deriving separate rules...
The paper addresses control of distillation columns at open-loop unstable operating points. The fact that ideal two-product distillation columns may have right half plane poles has only recently been recognized. The paper provides evidence for the observed instability. It is shown that the columns may be stabilized by use of one-point control, i.e., feedback control of a composition or a temperature...
The problem of obtaining linear models for effective control is discussed. First a good model structure is identified by comparing different models. It is demonstrated that the high-frequency behavior (initial time response) of the model is much more important for controller design than the steady-state characteristics. Finally, having determined a good model structure, the problem of obtaining models...
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