Accurate dynamic process response models are a key element in a successful refining MPC application. For most refinery processes, these response models are derived from data obtained during a specially designed plant test where the process independent variables is excited to cause movement in the MPC application dependent variables.
Typically, the derived responses are not suitable for use in a controller without applying some post identification modifications to ensure the resulting model represents the target process well. These modifications can include: 1) Enforcing Gain and dead time constraints on specific responses. 2) Enforcing collinear gain relationships between related responses such as a product analyser and an associated pressure compensated temperature. 3) Removal of inverse process responses where these are judged to be infeasible. 4) Development of variable transformations to better match the response data.
This paper describes how the above post identification modifications can be input as constraints to model identification phase. Approaching the problem in this way shortens the model development time and results in better models from less data. A side benefit is that future revamps of the controller are easier as the control engineers expertise is retained within the model identification package.
F&PD Members: Simply click on “click here to buy this archived webcast ” below and your ‘0’ price will appear in your shopping cart.
Would you like to access this content?
No problem. You just have to complete the following steps.
You have completed 0 of 2 steps.
You must be logged in to view this content. Log in now.
Purchase Technical Presentation
You must purchase this technical presentation using one of the options below.
If you already purchased this content recently, please click here to refresh the system's record of ownerships.
|Credits||0.5 Use credits|
|List Price||$25.00 Buy now|
|AIChE Members||$15.00 Buy now|
|AIChE Fuels and Petrochemicals Division Members||Free Free access|
|AIChE Undergraduate Student Members||Free Free access|
|AIChE Graduate Student Members||$15.00 Buy now|