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Publications (10 of 170) Show all publications
Wigren, T. (2019). A disturbance rejection and data rate trade-off in networked data flow control. European Journal of Control
Open this publication in new window or tab >>A disturbance rejection and data rate trade-off in networked data flow control
2019 (English)In: European Journal of Control, ISSN 0947-3580, E-ISSN 1435-5671Article in journal (Refereed) Epub ahead of print
National Category
Control Engineering
Identifiers
urn:nbn:se:uu:diva-366992 (URN)10.1016/j.ejcon.2018.07.001 (DOI)
Available from: 2018-07-08 Created: 2018-11-27 Last updated: 2018-12-17Bibliographically approved
Chistiakova, T., Wigren, T. & Carlsson, B. (2019). Combined L2-Stable Feedback and Feedforward Aeration Control in a Wastewater Treatment Plant. IEEE Transactions on Control Systems Technology
Open this publication in new window or tab >>Combined L2-Stable Feedback and Feedforward Aeration Control in a Wastewater Treatment Plant
2019 (English)In: IEEE Transactions on Control Systems Technology, ISSN 1063-6536, E-ISSN 1558-0865Article in journal (Refereed) Published
Abstract [en]

A nitrifying activated sludge process with ammonium feedback and inflow feedforward control is studied. The feedback and feedforward measurements are subject to time delay and the control loop includes a saturation. A Hammerstein based model is therefore identified, including process delays and the nonlinearity. A Monod-type nonlinearity is used, as motivated by the oxygen injection efficiency reduction, with increasing dissolved oxygen concentration. The proposed feedback control strategy includes tuning of a linear lag compensator that has alimited low-frequency gain which allows global stability to be established with the Popov criterion. The feedforward controller attenuates the disturbance and provides an overall improvement of the control strategy. The performance of the combined feedback and feedforward aeration controller is evaluated with a benchmark model. 

Keywords
Feedback, feedforward, stability analysis, system identification, wastewater.
National Category
Control Engineering
Identifiers
urn:nbn:se:uu:diva-374737 (URN)10.1109/TCST.2019.2891410 (DOI)
Available from: 2019-01-23 Created: 2019-01-23 Last updated: 2019-01-29
Nygren, J., Wigren, T. & Pelckmans, K. (2019). Frequency conditions for stable networked controllers with time-delay. International Journal of Control, 92
Open this publication in new window or tab >>Frequency conditions for stable networked controllers with time-delay
2019 (English)In: International Journal of Control, ISSN 0020-7179, E-ISSN 1366-5820, Vol. 92Article in journal (Refereed) Epub ahead of print
National Category
Control Engineering
Identifiers
urn:nbn:se:uu:diva-366988 (URN)10.1080/00207179.2017.1372635 (DOI)
Available from: 2017-09-26 Created: 2018-11-27 Last updated: 2019-01-03Bibliographically approved
Delgado, R. A., Lau, K., Middleton, R. H. & Wigren, T. (2019). Networked delay control for 5G wireless machine-type communications using multiconnectivity. IEEE Transactions on Control Systems Technology, 27
Open this publication in new window or tab >>Networked delay control for 5G wireless machine-type communications using multiconnectivity
2019 (English)In: IEEE Transactions on Control Systems Technology, ISSN 1063-6536, E-ISSN 1558-0865, Vol. 27Article in journal (Refereed) Epub ahead of print
National Category
Communication Systems
Identifiers
urn:nbn:se:uu:diva-366993 (URN)10.1109/TCST.2018.2813328 (DOI)
Available from: 2018-11-27 Created: 2018-11-27 Last updated: 2018-12-17Bibliographically approved
Yasini, S. & Wigren, T. (2018). Convergence in networked recursive identification with output quantization. In: : . Paper presented at SYSID 2018, July 9–11, Stockholm, Sweden (pp. 915-920). (15)
Open this publication in new window or tab >>Convergence in networked recursive identification with output quantization
2018 (English)Conference paper, Published paper (Refereed)
Series
IFAC-PapersOnLine, ISSN 2405-8963 ; 51:15
National Category
Control Engineering
Identifiers
urn:nbn:se:uu:diva-367043 (URN)10.1016/j.ifacol.2018.09.077 (DOI)000446599200155 ()
Conference
SYSID 2018, July 9–11, Stockholm, Sweden
Available from: 2018-10-08 Created: 2018-11-27 Last updated: 2018-12-14Bibliographically approved
Yasini, S. & Wigren, T. (2018). Counterexamples to parametric convergence in recursive networked identification. In: Proc. American Control Conference: ACC 2018. Paper presented at ACC 2018, June 27–29, Milwaukee, WI (pp. 258-264). American Automatic Control Council
Open this publication in new window or tab >>Counterexamples to parametric convergence in recursive networked identification
2018 (English)In: Proc. American Control Conference: ACC 2018, American Automatic Control Council , 2018, p. 258-264Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
American Automatic Control Council, 2018
National Category
Control Engineering
Identifiers
urn:nbn:se:uu:diva-367038 (URN)10.23919/ACC.2018.8431010 (DOI)978-1-5386-5428-6 (ISBN)
Conference
ACC 2018, June 27–29, Milwaukee, WI
Available from: 2018-08-16 Created: 2018-11-27 Last updated: 2018-11-27Bibliographically approved
Lau, K., Wigren, T., Middleton, R. H. & Delgado, R. A. (2018). Delay alignment control for 5G multi connectivity. In: Proc. 57th Conference on Decision and Control: . Paper presented at CDC 2018, December 17–19, Miami Beach, FL (pp. 7064-7070). Piscataway, NJ: IEEE
Open this publication in new window or tab >>Delay alignment control for 5G multi connectivity
2018 (English)In: Proc. 57th Conference on Decision and Control, Piscataway, NJ: IEEE, 2018, p. 7064-7070Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Piscataway, NJ: IEEE, 2018
National Category
Communication Systems
Identifiers
urn:nbn:se:uu:diva-375038 (URN)10.1109/CDC.2018.8619220 (DOI)978-1-5386-1395-5 (ISBN)
Conference
CDC 2018, December 17–19, Miami Beach, FL
Available from: 2019-01-21 Created: 2019-01-25 Last updated: 2019-01-25Bibliographically approved
Wigren, T., Lau, K., Delgado, R. A. & Middleton, R. H. (2018). Delay skew packet flow control in wireless systems with dual connectivity. IEEE Transactions on Vehicular Technology, 67(6), 5357-5371
Open this publication in new window or tab >>Delay skew packet flow control in wireless systems with dual connectivity
2018 (English)In: IEEE Transactions on Vehicular Technology, ISSN 0018-9545, E-ISSN 1939-9359, Vol. 67, no 6, p. 5357-5371Article in journal (Refereed) Published
National Category
Communication Systems
Identifiers
urn:nbn:se:uu:diva-366991 (URN)10.1109/TVT.2018.2808533 (DOI)000435553400052 ()
Available from: 2018-02-21 Created: 2018-11-27 Last updated: 2018-11-27Bibliographically approved
Chistiakova, T., Wigren, T. & Carlsson, B. (2018). Input–output stability design of an ammonium based aeration controller for wastewater treatment. In: Proc. American Control Conference: ACC 2018. Paper presented at ACC 2018, June 27–29, Milwaukee, WI (pp. 2964-2971). American Automatic Control Council
Open this publication in new window or tab >>Input–output stability design of an ammonium based aeration controller for wastewater treatment
2018 (English)In: Proc. American Control Conference: ACC 2018, American Automatic Control Council , 2018, p. 2964-2971Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
American Automatic Control Council, 2018
National Category
Control Engineering
Identifiers
urn:nbn:se:uu:diva-349422 (URN)10.23919/ACC.2018.8431151 (DOI)978-1-5386-5428-6 (ISBN)
Conference
ACC 2018, June 27–29, Milwaukee, WI
Available from: 2018-08-16 Created: 2018-04-27 Last updated: 2018-08-27Bibliographically approved
Chistiakova, T., Mattsson, P., Carlsson, B. & Wigren, T. (2018). Nonlinear system identification of the dissolved oxygen to effluent ammonium dynamics in an activated sludge process.
Open this publication in new window or tab >>Nonlinear system identification of the dissolved oxygen to effluent ammonium dynamics in an activated sludge process
2018 (English)Report (Other academic)
Series
Technical report / Department of Information Technology, Uppsala University, ISSN 1404-3203 ; 2018-011
National Category
Control Engineering Water Treatment
Identifiers
urn:nbn:se:uu:diva-367049 (URN)
Available from: 2018-08-13 Created: 2018-11-27 Last updated: 2018-11-27Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-2580-8906

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