Contact: kristian [dot] soltesz [at] control [dot] lth [dot] se
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The most common controller in the process industry today is the PID controller due to its simple structure. A regular factory may have thousands of different PID controllers in use where each of them has to be tuned to work satisfactory. Doing this manually can of course become both a difficult and time consuming task where some knowledge for each process is required. Therefore, it is highly beneficial of having a way to automatically tune the controllers which was the motivation behind the relay autotuner, first introduced in the 1980’s. Since then, many alterations of the original relay autotuner have been proposed as technology development concerning, both available computing power as well as regarding PID control, have progressed.
This master thesis is proposing a new autotuner based on a short asymmetrical relay experiment that is running at sufficiently low cost so that it can be executed directly in an ABB controller unit. This is highly beneficial for end customers who are to control a, for them, unknown process. An extensive simulation study is conducted using a test batch of a wide range of processes
representative for the process industry to ensure that the approach is appropriate. A suitable first order model with time delay (FOTD) is found from which a controller structure is based, following a set of well-known tuning rules. The method is then implemented in the ABB Ability TM System 800xA were the proposed method was shown to successfully control an unknown process in a robust way.
Student: Magnus Lundh
Kristian Soltesz, Dept. of Automatic Control, LTH
Alfred Theorin, ABB
Examiner: Tore Hägglund, Dept. of Automatic Control, LTH
The seminar will be held using Zoom at https://lu-se.zoom.us/j/8265013830.
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