By Cecil L. Smith
This ebook fills the distance among simple keep watch over configurations (Practical approach keep watch over) and version predictive keep an eye on (MPC). For these loops whose functionality has a right away influence on plant economics or product caliber, going past easy suggestions or cascade can increase keep watch over functionality, or particularly, decrease the variance concerning the aim. despite the fact that, the trouble required to enforce such keep an eye on know-how has to be offset by means of elevated monetary returns from construction operations. the commercial facets of the appliance of a few of the complex keep watch over applied sciences are under pressure in the course of the ebook.
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Extra info for Advanced Process Control: Beyond Single Loop Control
If true, freeze the value of Y to its current value. Current value. Value of Y at the time integrator/totalizer was last reset, that is, when input TRKMN made a false-to-true transition. True if Y < PSET. True if Y < PPSET. 5. LEAD-LAG ELEMENT In Chapter 6 we use a lead-lag element to provide dynamic compensation. In this section, the concept of lags and leads is presented, which is a key to understanding how a lead-lag element functions. In Chapter 6 we look at how to incorporate this block into ratio and feedforward control conﬁgurations.
Force input 2 to be selected. Value of selected input. True if input 1 is currently selected. True if input 2 is currently selected. The relationship for the selector block is as follows: Y = max(X1 , X2 ) min(X1 , X2 ) if a high select if a low select where Y = output of the selector block X1 = input 1 to the selector block X2 = input 2 to the selector block The selector block provides two discrete outputs: • Q1 : “True” if input 1 is selected (Y = X1 ). • Q2 : “True” if input 2 is selected (Y = X2 ).
The differential equation for a lead-lag is a combination of the equations presented previously for a pure lag and a pure lead: τLG dY dX + Y = τLD +X dt dt where X = input to lead-lag Y = output of lead-lag t = time (min) τLG = lead time (min) τLG = lag time (min) The lag time τLG must be a positive value (it can be neither zero nor negative), but the lead time τLD can be positive, negative, or zero. 9 presents several responses of a lead-lag element to a step change in the input X. The time axis is normalized by the lag time τLG .
Advanced Process Control: Beyond Single Loop Control by Cecil L. Smith