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Robust tuning is presented for PFC (Predictive Functional Controller) for stable non-integrative processes modelled as FOPDT and aperiodic SOPDT (First- and Second-Order Plus Dead Time) models, assuming stepwise changes in the reference or disturbance signal. The robustness is improved by using a first-order filter. The filter time constant is designed in the knowledge of the uncertainty of the model...
PFC is known to be effective and simple for a large number of industrial scenarios. However, there are some cases where the default PFC algorithm is less effective and needs significant insight or modification. This paper proposes a modification to the conventional algorithm to improve the ease of tuning for systems with significant under-damped modes. The proposed approach is almost identical to...
Predictive controllers are used frequently with PI backup controllers. As the two algorithms (PI and predictive) are different a switch between them can cause big jumps. A bumpless switch is a very important issue. A smooth switch is desired to avoid any discontinuity in the manipulated and the controlled variables. A common strategy is to let run the backup controller in such a way that the calculated...
PFC (Predictive Functional Control) algorithm is a very effective simple SISO (Single Input, Single Output) controller. PFC controller parameters have a physical meaning and they are easy to tune. PI(D) controllers are very widespread in the industry although their tuning is not easy. It is a common opinion that predictive controller is much better than PI(D) controller. However PI(D) controllers...
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