Chemical Engineering. Essentials of Process Control by Dupont

By Dupont

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Sample text

Determining the values of controller tuning constants that give the best control. ). ’ The third level is control system structure--determining what to control, what to manipulate, and how to match one controlled variable with one manipulated variable (called “pairing”). The selection of the control structure for a plant is a vitally important function. A good choice of structure makes it easy to select an appropriate algorithm and to tune. No matter what algorithm or tuning is used, it is very unlikely that a poor structure can be made to give effective control.

01 hr because of the deadtime. Comparing Figs. 13 shows clearly that the dynamic performance with deadtime is worse. Higher gains now give oscillatory behavior. The FORTRAN program used for the deadtime simulation is given in Appendix A. These simulation results illustrate some profoundly important principles: 1. As controller gain is increased, the response of the process becomes faster but more oscillatory. This suggests that there is an. inherent engineering trade-off between speed of response and oscillatory behavior.

5 I I . . . . . . . . . . . . . . . . . ~.................. 01 hr in the measurement of the temperature 7’, . The temperature controller sees a PV signal that is delayed by D hours. The effect this has on control is illustrated in Fig. 13. 01 hr because of the deadtime. Comparing Figs. 13 shows clearly that the dynamic performance with deadtime is worse. Higher gains now give oscillatory behavior. The FORTRAN program used for the deadtime simulation is given in Appendix A.

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