Regarding how to proceed with PID tuning
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I’ve been studying DCS for only a short time; I found plenty of information online on how to tune PID parameters. Unless one is in this field, it’s really difficult to understand such things. I just adjusted them by trial and error; the level control valves for the last two single circuits were set to the following values. It seems to fluctuate by 10%-15% up and down. I would appreciate some guidance from experts on how to adjust it to meet your requirements. Also, is it normal for MV to change significantly after SV and PV converge?
PD control is used for level regulation; it’s generally not necessary to use integral action to eliminate lag. The P value can usually be set between 150 and 200, while the derivative value should be increased by around 20 – give it a try
This post was last edited by jlshnlhj on 2022-1-11 at 10:23; it should be controlled by P,I. The I integral is used to eliminate residual errors. Differentials are generally not used. For Figure 1, try setting P to 30-35% and I to 4-5. Similarly in Figure 2, reduce P and increase I.
Increase both the proportional and integral values gradually, adjusting them slowly while observing the patterns