Voices: McMillan & Weiner

Don't overlook the virtues of PID when optimizing processes

Model predictive control isn't always the best choice

By Greg McMillan and Stan Weiner
Jun 19, 2015

*Stan:* PID is the workhorse of the process industry. It has more than enough flexibility and capability to maximize the performance of PID loops distributed throughout the process for different objectives and difficult situations. However, the disparity is increasing between what PID can do and how it is used. I suspect this is due to an increase in the capability of PID, growing disagreement and misunderstandings in tuning rules, the lack of tools for automatically setting dynamic compensation of feedforward and decoupling signals, a decrease in the expertise onsite, and the lack of succinct guidance.

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