Practical PID Control: Use Filters for Better Disturbance Rejection and Setpoint Tracking

Developed by: AIChE
  • Type:
    Conference Presentation
  • Conference Type:
    AIChE Spring Meeting and Global Congress on Process Safety
  • Presentation Date:
    March 15, 2011
  • Skill Level:
  • PDHs:

Share This Post:

You will be able to download and print a certificate for PDH credits once the content has been viewed. If you have already viewed this content, please click here to login.

Many of the practical problems in achieving high performance feedback control for challenging applications have been addressed by modifications to the basic PID control law. These modifications include set-point filters that allow both load rejection and set-point following objectives to be satisfied simultaneously and the use of low pass filters to improve stability, particularly when derivative action is employed.

The drawback of course is that these modifications introduce more tuning parameters that have to be adjusted in order to achieve the desired performance. Non linear optimization techniques allow the control engineer to tune this extended set of parameters taking into account practical considerations such as model estimation uncertainty, interactive control loops, actuator wear etc.

This paper will consider the performance of various optimally tuned feedback control strategies to a simulated refining process with interactive control variables. A multivariable controller will be used as a benchmark reference. The impact of model error and process constraints will also be considered. We will demonstrate how control performance can be improved by the correct use of the tuning parameters that are available in most commercial distributed control systems, allowing significant benefits to be achieved for a relatively modest investment.

Please Note: Members of the Fuels & Petrochemicals Division of AIChE are entitled to this content for free. Simply click on 'view this webcast' below and when you get to the shopping cart, your Division membership will be recognized and your price will be &'$0&'. Only AIChE members are entitled to join the Fuels & Petrochemicals Division. For more info please click here. click here



Do you already own this?

Log In for instructions on accessing this content.


AIChE Member Credits 0.5
AIChE Members $15.00
AIChE Fuels and Petrochemicals Division Members Free
AIChE Undergraduate Student Members Free
AIChE Graduate Student Members Free
Non-Members $25.00