Cascade Control: Improving Disturbance Rejection Through Advanced PID Control

There’s a common misconception in various corners of the process industries related to advanced
process control (APC). When the topic of APC is raised it’s not uncommon for practitioners to
immediately think of complex fuzzy logic and model predictive solutions. But a broader view of APC also includes advanced applications of the Proportional Integral Derivative (PID) controller. Chief among those APC solutions both used in industry and based on the PID is Cascade Control.

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How Does Loop Monitoring Help with Root-Cause Analysis?

For most individuals, a house is the most expensive asset that they’ll ever purchase. And while living there a homeowner can expect a significant problem or two to arise whether that problem involves a leaky roof, termite damage, or some other costly issue. A downside of such problems is that the damage is typically and irrevocably done before the homeowner encounters the first visible signs that the issue even existed.

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November 29, 2016 – International Process Manufacturers Targeted with 2017 Training Offering

Control Station today announced its 2017 training schedule which targets major manufacturing centers located across North America and Europe. Training workshops will be delivered in collaboration with the company’s Solution Partners and Product Distributors, and they will emphasize proven techniques for optimizing a production facility’s regulatory control systems.

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Accelerating Start-Up, Optimizing PID Control

Control Station has been fortunate to partner with leading, global OEMs like Yokogawa.  Award-winning products like csTuner are helping process manufacturers at all stages of operation.  As GranBio in Brazil recently shared, csTuner is especially valuable during start-up when highly variable process conditions are the norm and quickly establishing safe, stable operations is the objective.  Our portfolio of PID tuning products are the only ones consistently proven to handle those complex dynamics – what engineers know as the ‘real-world’.

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Common Industrial Applications of PID Control with Filter

Other Questions.
Sometimes controller design feels like a choice between the lesser of not two but three evils. P-Only Control is simple and provides a fast response, but the resulting Offset hinders tight control. PI Control addresses Offset but it leaves room for improvement. And then there’s PID Control which enhances a loop’s Set Point Tracking but typically at the expense of the associated Final Control Element (FCE). If not for the ubiquitous nature of noise in industrial applications, then PID Control would be the clear choice. But since there’s no escaping noise, what’s a practitioner to do?

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Common Industrial Applications of PID Control

A previous post about the Derivative Term focused on its weaknesses. As noted, the primary challenge associated with the use of Derivative and PID Control is the volatility of the controller’s response when in the presence of noise. Noise is a major stumbling block for Derivative and PID Control as production data is routinely replete with process noise and other sources of variability. The use of PID Control in such an environment can drive frenetic changes in a loop’s Controller Output (CO) and unnecessarily wear out the associated Final Control Element (FCE). In summary: Little to gain; lots to lose.

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Who Benefits from Process Control Training?

No surprise, as the demographics of industrial automation continue to shift a graying workforce is giving way to a younger, greener one. More and more staff are retiring just as the “automation oracles” predicted. In tandem with that trend investments in training and skills development are recovering from previously reduced, recessionary levels. With those budgets being restored some somewhat surprising questions keep popping up: How should process manufacturers apply their newly reinstated funds? Who should attend?

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