Abstract
This paper describes adaptive control of the superheat in a refrigeration system. Traditionally, the superheat is PI controlled using constant gain and integration time, which often will have a conservative tuning. On-line update of the controller parameters in self-tuning scheme by identification in open loop or by using external signals in closed loop is cumbersome. In this work a method using PI controllers with shifting parameters in a bumpless set-up has been used for finding better parameters. Each controller is used in a certain time interval and ISE (Integrated Squared Error) is calculated as a measure for the quality. This is used in a gradient method to increase the performance. The improved PI controller gives the possibility to optimise the superheat reference via an additional control loop. The controllers are designed and tested in a laboratory set-up. The performance of the shifting adaptive controller turns out to have a better performance than a fixed parameter PI controller.
Original language | English |
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Title of host publication | 2018 IEEE Conference on Control Technology and Applications (CCTA) |
Number of pages | 6 |
Publisher | IEEE |
Publication date | 26 Oct 2018 |
Pages | 496-501 |
Article number | 8511512 |
ISBN (Print) | 978-1-5386-7699-8 |
ISBN (Electronic) | 978-1-5386-7698-1 |
DOIs | |
Publication status | Published - 26 Oct 2018 |
Event | 2018 IEEE Conference on Control Technology and Applications (CCTA) - The Scandic Hotel Copenhagen, Copenhagen, Denmark Duration: 21 Aug 2018 → 24 Aug 2018 |
Conference
Conference | 2018 IEEE Conference on Control Technology and Applications (CCTA) |
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Location | The Scandic Hotel Copenhagen |
Country/Territory | Denmark |
City | Copenhagen |
Period | 21/08/2018 → 24/08/2018 |