Improved constraint handling approach for predictive functional control using an implied closed-loop prediction

Predictive Functional Control is a simple alternative to the traditional PID controller which has the capability to handle process constraints more systematically. Nevertheless, the most basic form of PFC has suffered from ill-posed prediction due to its simplicity in formulation and assumption of c...

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Main Authors: Abdullah, Muhammad, Rossiter, John Anthony, Abdul Ghaffar, Alia Farhana
Format: Article
Language:English
English
English
Published: IIUM Press, International Islamic University Malaysia 2021
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Online Access:http://irep.iium.edu.my/87642/1/87642_Improved%20constraint%20handling%20approach.pdf
http://irep.iium.edu.my/87642/6/87642_Improved%20constraint%20handling%20approach%20for%20predictive%20functional_WOS.pdf
http://irep.iium.edu.my/87642/7/87642_Improved%20constraint%20handling%20approach%20for%20predictive%20functional_Scopus.pdf
http://irep.iium.edu.my/87642/
https://journals.iium.edu.my/ejournal/index.php/iiumej/article/view/1538/797
https://doi.org/10.31436/iiumej.v22i1.1538
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id my.iium.irep.87642
record_format dspace
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
English
English
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Abdullah, Muhammad
Rossiter, John Anthony
Abdul Ghaffar, Alia Farhana
Improved constraint handling approach for predictive functional control using an implied closed-loop prediction
description Predictive Functional Control is a simple alternative to the traditional PID controller which has the capability to handle process constraints more systematically. Nevertheless, the most basic form of PFC has suffered from ill-posed prediction due to its simplicity in formulation and assumption of constant future input dynamics. Although some constraints can be satisfied, nevertheless the performance may be very conservative due to this issue. The main objective of this paper is to improve the constrained performance of a PFC controller with a minimum modification of the existing formulation. Specifically, a novel constraint handling approach for PFC is proposed based on an implied closed-loop prediction. Instead of assuming a constant input as deployed in the conventional open-loop prediction, the implied closed-loop input dynamics are utilised to detect future constraint violations. In addition, a future perturbation is introduced into the prediction structure as an extra degree of freedom for satisfying the constraints. Two simulation results confirm that the proposed approach gives far less conservative constraint handling and thus better control performance compared to the nominal PFC. Furthermore, this novel implementation also alleviates the well-known tuning difficulties and prediction inconsistency issues that are associated with conventional PFC when handling constraints. ******************************************************************************* Kawalan Kefungsian Ramalan adalah alternatif mudah kepada kawalan tradisional PID yang mempunyai kekangan keupayaan bagi mengawal proses secara lebih tersusun. Namun, keadaan paling asas pada kesan PFC adalah daripada ramalan tak teraju-rapi yang disebabkan oleh formula ringkas dan anggapan dinamik input yang sama bagi masa depan. Walau kekangan ini dapat diatasi, namun prestasi akan berubah secara konservatif disebabkan oleh isu ini. Objektif utama kajian ini adalah bagi membaiki kekangan prestasi kawalan PFC dengan modifikasi minimum formula yang ada. Secara spesifik, pendekatan nobel kawalan PFC dicadangkan berdasarkan ramalan lingkaran-tertutup. Selain anggapan input tetap seperti yang dilakukan pada ramalan lingkaran-terbuka yang konservatif, dinamik input yang dibuat pada lingkaran-tertutup telah digunakan bagi mengesan kekangan masa depan yang bertentangan. Tambahan, gangguan yang bakal berlaku pada masa depan telah diperkenalkan ke dalam struktur ramalan sebagai tambahan darjah pada kebebasan bagi mengatasi kekangan. Dua dapatan simulasi kajian menyetujui pendekatan yang dicadangkan dan menyebabkan sangat kurang kekangan pengendalian pada sistem konservatif, oleh itu kawalan yang lebih bagus pada prestasi berbanding pada PFC nominal. Selain itu, pendekatan nobel ini juga menghilangkan kesukaran pelarasan yang dikenali ramai dan ramalan isu tidak konsisten yang terdapat pada PFC konvensional apabila mengendali kekangan.
format Article
author Abdullah, Muhammad
Rossiter, John Anthony
Abdul Ghaffar, Alia Farhana
author_facet Abdullah, Muhammad
Rossiter, John Anthony
Abdul Ghaffar, Alia Farhana
author_sort Abdullah, Muhammad
title Improved constraint handling approach for predictive functional control using an implied closed-loop prediction
title_short Improved constraint handling approach for predictive functional control using an implied closed-loop prediction
title_full Improved constraint handling approach for predictive functional control using an implied closed-loop prediction
title_fullStr Improved constraint handling approach for predictive functional control using an implied closed-loop prediction
title_full_unstemmed Improved constraint handling approach for predictive functional control using an implied closed-loop prediction
title_sort improved constraint handling approach for predictive functional control using an implied closed-loop prediction
publisher IIUM Press, International Islamic University Malaysia
publishDate 2021
url http://irep.iium.edu.my/87642/1/87642_Improved%20constraint%20handling%20approach.pdf
http://irep.iium.edu.my/87642/6/87642_Improved%20constraint%20handling%20approach%20for%20predictive%20functional_WOS.pdf
http://irep.iium.edu.my/87642/7/87642_Improved%20constraint%20handling%20approach%20for%20predictive%20functional_Scopus.pdf
http://irep.iium.edu.my/87642/
https://journals.iium.edu.my/ejournal/index.php/iiumej/article/view/1538/797
https://doi.org/10.31436/iiumej.v22i1.1538
_version_ 1696976074893688832
spelling my.iium.irep.876422021-04-12T08:21:30Z http://irep.iium.edu.my/87642/ Improved constraint handling approach for predictive functional control using an implied closed-loop prediction Abdullah, Muhammad Rossiter, John Anthony Abdul Ghaffar, Alia Farhana TJ Mechanical engineering and machinery Predictive Functional Control is a simple alternative to the traditional PID controller which has the capability to handle process constraints more systematically. Nevertheless, the most basic form of PFC has suffered from ill-posed prediction due to its simplicity in formulation and assumption of constant future input dynamics. Although some constraints can be satisfied, nevertheless the performance may be very conservative due to this issue. The main objective of this paper is to improve the constrained performance of a PFC controller with a minimum modification of the existing formulation. Specifically, a novel constraint handling approach for PFC is proposed based on an implied closed-loop prediction. Instead of assuming a constant input as deployed in the conventional open-loop prediction, the implied closed-loop input dynamics are utilised to detect future constraint violations. In addition, a future perturbation is introduced into the prediction structure as an extra degree of freedom for satisfying the constraints. Two simulation results confirm that the proposed approach gives far less conservative constraint handling and thus better control performance compared to the nominal PFC. Furthermore, this novel implementation also alleviates the well-known tuning difficulties and prediction inconsistency issues that are associated with conventional PFC when handling constraints. ******************************************************************************* Kawalan Kefungsian Ramalan adalah alternatif mudah kepada kawalan tradisional PID yang mempunyai kekangan keupayaan bagi mengawal proses secara lebih tersusun. Namun, keadaan paling asas pada kesan PFC adalah daripada ramalan tak teraju-rapi yang disebabkan oleh formula ringkas dan anggapan dinamik input yang sama bagi masa depan. Walau kekangan ini dapat diatasi, namun prestasi akan berubah secara konservatif disebabkan oleh isu ini. Objektif utama kajian ini adalah bagi membaiki kekangan prestasi kawalan PFC dengan modifikasi minimum formula yang ada. Secara spesifik, pendekatan nobel kawalan PFC dicadangkan berdasarkan ramalan lingkaran-tertutup. Selain anggapan input tetap seperti yang dilakukan pada ramalan lingkaran-terbuka yang konservatif, dinamik input yang dibuat pada lingkaran-tertutup telah digunakan bagi mengesan kekangan masa depan yang bertentangan. Tambahan, gangguan yang bakal berlaku pada masa depan telah diperkenalkan ke dalam struktur ramalan sebagai tambahan darjah pada kebebasan bagi mengatasi kekangan. Dua dapatan simulasi kajian menyetujui pendekatan yang dicadangkan dan menyebabkan sangat kurang kekangan pengendalian pada sistem konservatif, oleh itu kawalan yang lebih bagus pada prestasi berbanding pada PFC nominal. Selain itu, pendekatan nobel ini juga menghilangkan kesukaran pelarasan yang dikenali ramai dan ramalan isu tidak konsisten yang terdapat pada PFC konvensional apabila mengendali kekangan. IIUM Press, International Islamic University Malaysia 2021-01-04 Article PeerReviewed application/pdf en http://irep.iium.edu.my/87642/1/87642_Improved%20constraint%20handling%20approach.pdf application/pdf en http://irep.iium.edu.my/87642/6/87642_Improved%20constraint%20handling%20approach%20for%20predictive%20functional_WOS.pdf application/pdf en http://irep.iium.edu.my/87642/7/87642_Improved%20constraint%20handling%20approach%20for%20predictive%20functional_Scopus.pdf Abdullah, Muhammad and Rossiter, John Anthony and Abdul Ghaffar, Alia Farhana (2021) Improved constraint handling approach for predictive functional control using an implied closed-loop prediction. IIUM Engineering Journal, 22 (1). pp. 323-338. ISSN 1511-788X E-ISSN 2289-7860 https://journals.iium.edu.my/ejournal/index.php/iiumej/article/view/1538/797 https://doi.org/10.31436/iiumej.v22i1.1538
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