Time-Varying FOPDT System Identification with Unknown Disturbance Input

Zhen Sun, Zhenyu Yang

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

1 Citation (Scopus)

Abstract

The Time-Varying First Order Plus Dead Time (TV-FOPDT) model is an extension of the conventional FOPDT by allowing the system parameters, which are primarily defined on the transfer function description, i.e., the DC-gain, time constant and time delay, to be time dependent. The TV-FOPDT identification problem turns to estimate these time-varying parameters based on measured control input and system output. This work considers a TV-FOPDT identification problem in the presence of an unknown disturbance input. By regarding the unknown input as one extra system parameter, the considered identification problem is formulated as a Stochastic Mixed Integral Programming (SMIP) problem after discretizing the original problem. The sliding window technique with forgetting factor is employed to cope with time resolution issue, and the Least Mean Square (LMS) method is used to obtain the optimal solution of each individual optimization problem based on different time delay assumptions. The proposed method is firstly tested through a number of numerical examples, and then it is applied to estimate a TV-FOPDT model of the superheat dynamic of a supermarket refrigeration system.
Original languageEnglish
Title of host publicationProceedings of the 2012 IEEE International Conference on Control Applications (CCA)
Number of pages6
PublisherIEEE Press
Publication date2012
Pages364-369
ISBN (Print)978-1-4673-4503-3
ISBN (Electronic)978-1-4673-4504-0
DOIs
Publication statusPublished - 2012
EventIEEE International Conference on Control Applications -
Duration: 3 Oct 2012 → …

Conference

ConferenceIEEE International Conference on Control Applications
Period03/10/2012 → …
SeriesI E E E International Conference on Control Applications. Proceedings
ISSN1085-1992

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    Sun, Z., & Yang, Z. (2012). Time-Varying FOPDT System Identification with Unknown Disturbance Input. In Proceedings of the 2012 IEEE International Conference on Control Applications (CCA) (pp. 364-369). IEEE Press. I E E E International Conference on Control Applications. Proceedings https://doi.org/10.1109/CCA.2012.6402686