ISA Interchange

Welcome to the official blog of the International Society of Automation (ISA).

This blog covers numerous topics on industrial automation such as operations & management, continuous & batch processing, connectivity, manufacturing & machine control, and Industry 4.0.

The material and information contained on this website is for general information purposes only. ISA blog posts may be authored by ISA staff and guest authors from the automation community. Views and opinions expressed by a guest author are solely their own, and do not necessarily represent those of ISA. Posts made by guest authors have been subject to peer review.

All Posts

Improving the Performance of a Model Predictive Controller for Regulatory Control [Technical]

 

This post is an excerpt from the journal ISA Transactions. All ISA Transactions articles are free to ISA members, or can be purchased from Elsevier Press.

 

 

 

Abstract: Proportional integral derivative (PID) control is widely practiced as the base layer controller in the industry due to its robustness and design simplicity. However, a supervisory control layer over the base layer, namely a model predictive controller (MPC), is becoming increasingly popular with the advent of computer process control. The use of a supervisory layer has led to different control structures. In this study, we perform an objective investigation of several commonly used control structures such as “Cascaded PI controller,” “DMC cascaded to PI” and “Direct DMC.” Performance of these control structures are compared on a pilot-scale continuous stirred tank heater (CSTH) system. We used dynamic matrix control (DMC) algorithm as a representative of MPC. In the DMC cascaded to PI structure, the flow-loops are regulated by the PI controller. On top of that a DMC manipulates the set-points of the flow-loops to control the temperature and the level of water in the tank. The “Direct DMC” structure, as its name suggests, uses DMC to manipulate the valves directly. Performance of all control structures were evaluated based on the integrated squared error (ISE) values. In this empirical study, the “Direct DMC” structure showed a promise to act as regulatory controller. The selection of control frequency is critical for this structure. The effect of control frequency on controller performance of the “Direct DMC” structure was also studied.

 

Free Bonus! To read the full version of this ISA Transactions article, click here.

 

Enjoy this technical resource article? Join ISA and get free access to all ISA Transactions articles as well as a wealth of other technical content, plus professional networking and discounts on technical training, books, conferences, and professional certification.

Click here to join ISA ... learn, advance, succeed!

2006-2019 Elsevier Science Ltd. All rights reserved.


Related Posts

5 Ways Manufacturers Can Protect Their IP

Industry 4.0 is defined by the marriage of the digital and the physical, taking the form of smart factori...
Emily Newton Aug 16, 2022 5:30:00 AM

IDM Can Improve Plant Reliability and Reduce Downtime

There are hundreds of smart instruments including sensors and final control elements installed in medium-...
Bakhtiar Pour Ahmad Aug 12, 2022 5:30:00 AM

The Opportunities and Obstacles in Using Automation for PCB Assembly

Automation has revolutionized the printed circuit board (PCB) industry with enhanced product reliability ...
Suresh Patel Aug 9, 2022 5:30:00 AM