Tobias K. S. Ritschel
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Peer-reviewed conference publications (44)

In preparation/submission (6)

Ritschel, T.K.S., 2024. Numerical Optimal Control for Distributed Delay Differential Equations: A Simultaneous Approach based on Linearization of the Delayed Variables. arXiv: 2410.15083. In submission.

Ritschel, T.K.S., Stange, S., 2024. Numerical Optimal Control for Delay Differential Equations: A Simultaneous Approach based on Linearization of the Delayed State. arXiv: 2410.02687. In submission.

Ritschel, T.K.S., 2024. Numerical Simulation of Nonlinear Distributed Delay Differential Equations based on a Mixed Erlang Kernel Approximation. In submission.

Martinsen, E.S., Filonenko, K., Poulsen, M.H., Møller, J.K., Madsen, H., Rasmussen, J.K., Ritschel, T.K.S., 2024. Process Optimization for a Flexibly Operated Plastic Waste-to-methanol Plant. In submission.

Martinsen, E.S., Møller, J.K., Madsen, H., Thygesen, U.H., Ritschel, T.K.S., 2024. Optimal Price Signal Generation for Indirect Control of Flexible Energy Demand under Uncertainty. In submission.

Tohidi, S.S., Mahdavi, N. Ritschel, T.K.S., Madsen, H., 2024. Adaptive Digital Twin for Time-varying Energy Flexibility Dynamics. In submission.

2024 (2)

Madsen, H., Tohidi, S., Ebrahimy, R., Banaei, M., Ritschel, T.K.S., Mahdavi, N., 2024. Recent Trends in Demand-side Flexibility. In: Proceedings of the 4th Energy Informatics Academy Conference (EI.A), October 23-25, Bali, Indonesia. DOI (book): 10.1007/978-3-031-74741-0. DOI (paper/chapter): 10.1007/978-3-031-74741-0_12.

Tohidi, S.S., Madsen, H., Tsaousoglou, G., Ritschel, T.K.S., 2024. Adaptive Flexibility Function in Smart Energy Systems: A Linearized Price-demand Mapping Approach. In: Proceedings of the 2024 European Control Conference (ECC), pp. 1315–1320, June 25-28, Stockholm, Sweden. arXiv: 2312.03422. DOI: 10.23919/ECC64448.2024.10590768.

2023 (8)

Rosbo, J.W., Ritschel, T.K.S., Hørsholt, S., Jensen, A.D., Jørgensen, J.B., Huusom, J.K., 2023. Optimal Power Distribution in a P2A plant. Computer Aided Chemical Engineering 52, pp. 1777–1782. DOI: 10.1016/B978-0-443-15274-0.50282-1.

Ritschel, T.K.S., 2023. A Newton-like Method based on Model Reduction Techniques for Implicit Numerical Methods. In: Proceedings of the 2023 European Control Conference (ECC), June 13-16, Bucharest, Romania. arXiv: 2303.06978. DOI: 10.23919/ECC57647.2023.10178156.

Cantisani, N., Ritschel, T.K.S., Thilker, C.A., Madsen, H., Jørgensen, J.B., 2023. Modeling, Scientific Computing and Optimal Control for Renewable Energy Systems with Storage. In: Proceedings of the 2023 European Control Conference (ECC), June 13-16, Bucharest, Romania. arXiv: 2212.08842. DOI: 10.23919/ECC57647.2023.10178226.

Andersen, A.H.D., Zhang, Z., Hørsholt, S., Ritschel, T.K.S., Jørgensen, J.B., 2023. Software principles and concepts applied in the implementation of cyber-physical systems for real-time advanced process control. In: Proceedings of the 2023 European Control Conference (ECC), June 13-16, Bucharest, Romania. arXiv: 2302.13595. DOI: 10.23919/ECC57647.2023.10178231.

Ritschel, T.K.S., Reenberg, A.T., Lindkvist, E.B., Laugesen, C., Svensson, J., Ranjan, A.G., Nørgaard, K., Dammann, B., Jørgensen, J.B., 2022. A One-size-fits-all Artificial Pancreas for People with Type 1 Diabetes based on Physiological Insight and Feedback Control. In: Proceedings of the 2023 European Control Conference (ECC), June 13-16, Bucharest, Romania. arXiv: 2202.13338. DOI: 10.23919/ECC57647.2023.10178186.

Martinsen, E.S., Rosbo, J.W., Andersen, A.H.D., Ritschel, T.K.S., Hørsholt, S., Huusom, J.K., Jørgensen, J.B., 2023. Modeling and Simulation of a Single Catalytic Fixed Bed in an Ammonia Reactor. IFAC-PapersOnLine 56(2), pp. 6906–6912. DOI: 10.1016/j.ifacol.2023.10.497.

Andersen, A.H.D., Ritschel, T.K.S., Hørsholt, S., Huusom, J.K., Jørgensen, J.B., 2023. Model-based Control Algorithms for the Quadruple Tank System: An experimental comparison. In: Proceedings of Foundations of Computer Aided Process Operations / Chemical Process Control 2023 (FOCAPO/CPC), January 8-12, San Antonio, Texas, USA. arXiv: 2212.04798. Link.

Nielsen, M.K., Ritschel, T.K.S., Christensen, I., Dragheim, J., Huusom, J.K., Gernaey, K., Jørgensen, J.B., 2023. State Estimation for Continuous-discrete-time Nonlinear Stochastic Systems. In: Proceedings of Foundations of Computer Aided Process Operations / Chemical Process Control 2023 (FOCAPO/CPC), January 8-12, San Antonio, Texas, USA. arXiv: 2205.02730. Link.

2022 (8)

Engell, S.E., Aradóttir, T.B., Ritschel, T.K.S., Bengtsson, H., Jørgensen, J.B., 2022. Estimating a Personalized Basal Insulin Dose from Short-term Closed-loop Data in Type 2 Diabetes. In: Proceedings of the 61st IEEE Conference on Decision and Control (CDC), Cancún, Mexico, December 6-9. arXiv: 2211.14149. DOI: 10.1109/CDC51059.2022.9992960.

Ritschel, T.K.S., Reenberg, A.T., Jørgensen, J.B., 2022. Large-scale Virtual Clinical Trials of Closed-loop Treatments for People with Type 1 Diabetes. IFAC-PapersOnLine 55(23), pp. 169–174. arXiv: 2205.01332. DOI: 10.1016/j.ifacol.2023.01.037.

Carstensen, P.E., Bendsen, J., Reenberg, A.T., Ritschel, T.K.S., Jørgensen, J.B., 2022. A Whole-body Multi-scale Mathematical Model for Dynamic Simulation of the Metabolism in Man. IFAC-PapersOnLine 55(23), pp. 58–63. arXiv: 2205.01473. DOI: 10.1016/j.ifacol.2023.01.015.

Reenberg, A.T., Ritschel, T.K.S., Lindkvist, E.B., Laugesen, C., Svensson, J., Ranjan, A.G., Nørgaard, K., Jørgensen, J.B., 2022. Nonlinear Model Predictive Control and System Identification for a Dual-hormone Artificial Pancreas. IFAC-PapersOnLine 55(7), pp. 915–921. arXiv: 2202.13938. DOI: 10.1016/j.ifacol.2022.07.561.

Wahlgreen, M.R., Meyer, K., Ritschel, T.K.S., Engsig-Karup, A.P., Gernaey, K.V., Jørgensen, J.B., 2022. Modeling and Simulation of Upstream and Downstream Processes for Monoclonal Antibody Production. IFAC-PapersOnLine 55(7), pp. 685–690. DOI: 10.1016/j.ifacol.2022.07.523.

Furió-Novejarque, C., Sanz, R., Reenberg, A.T., Ritschel, T.K.S., Ranjan, A.G., Nørgaard, K. and Díez, J.-L., Jørgensen, J.B., Bondia, J., 2022. Assessment of a New Model of Glucagon Action with Glucagon Receptor Dynamics. IFAC-PapersOnLine 55(20), pp. 647–652. DOI: 10.1016/j.ifacol.2022.09.169.

Sauerteig, P., Esterhuizen, W., Wilson, M., Ritschel, T.K.S., Worthmann, K., Streif, S., 2022. Model Predictive Control Tailored to Epidemic Models. In: Proceedings of the 2022 European Control Conference (ECC), pp. 743–748, July 12-15, London, UK. arXiv: 2111.06688v1. DOI: 10.23919/ECC55457.2022.9838589.

Reenberg, A.T., Ritschel, T.K.S., Dammann, B., Jørgensen, J.B., 2022. High-performance Uncertainty Quantification in Large-scale Virtual Clinical Trials of Closed-loop Diabetes Treatment. In: Proceedings of the 2022 American Control Conference (ACC), pp. 1367–1372, June 8-10, Atlanta, Georgia, USA. arXiv: 2202.13927. DOI: ACC53348.2022.9867234.

2021 (2)

Sejersen, M., Boiroux, D., Engell, S.E., Ritschel, T.K.S., Reenberg, A.T., Jørgensen, J.B., 2021. Initial Titration for People with Type 1 Diabetes using an Artificial Pancreas. IFAC-PapersOnLine 54(15), pp. 484–489. DOI: 10.1016/j.ifacol.2021.10.303.

Wahlgreen, M.R., Reenberg, A.T., Nielsen, M.K., Rydahl, A., Ritschel, T.K.S., Dammann, B., Jørgensen, J.B., 2021. A High-performance Monte Carlo Simulation Toolbox for Uncertainty Quantification of Closed-loop Systems. In: Proceedings of the 60th Conference on Decision and Control (CDC), pp. 6755–6761, Austin, Texas, USA. DOI: 10.1109/CDC45484.2021.9682781.

2020 (3)

Ritschel, T.K.S., Boiroux, D., Nielsen, M.K., Huusom, J.K., Jørgensen, S.B., Jørgensen, J.B., 2020. Economic Nonlinear Model Predictive Control of a U-loop Bioreactor. In: Proceedings of the 2020 European Control Conference (ECC), pp. 208–213, Saint Petersburg, Russia, May 12-15. DOI: 10.23919/ECC51009.2020.9143629.

Jørgensen, J.B., Ritschel, T.K.S., Boiroux, D., Schroll-Fleischer, E., Wahlgreen, M.R., Nielsen, M.K., Wu, H., Huusom, J.K., 2020. Simulation of NMPC for a Laboratory Adiabatic CSTR with an Exothermic Reaction. In: Proceedings of the 2020 European Control Conference (ECC), pp. 202–207, Saint Petersburg, Russia, May 12-15. DOI: 10.23919/ECC51009.2020.9143733.

Wahlgreen, M.R., Schroll-Fleischer, E., Boiroux, D., Ritschel, T.K.S., Wu, H., Huusom, J.K., Jørgensen, J.B., 2020. Nonlinear Model Predictive Control for an Exothermic Reaction in an Adiabatic CSTR. IFAC-Papers-OnLine 53(1), pp. 500–505. DOI: 10.1016/j.ifacol.2020.06.084.

2019 (6)

Boiroux, D., Ritschel, T.K.S., Poulsen, N.K., Madsen, H., Jørgensen, J.B., 2019. Efficient Computation of the Continuous-Discrete Extended Kalman Filter Sensitivities Applied to Maximum Likelihood Estimation. In: Proceedings of the 58th IEEE Conference on Decision and Control (CDC), pp. 6983–6988, Nice, France, December 11-13. DOI: 10.1109/CDC40024.2019.9029672.

Reenberg, A.T., Boiroux, D., Ritschel, T.K.S., Jørgensen, J.B., 2019. Model Predictive Control of the Blood Glucose Concentration for Critically Ill Patients in Intensive Care Units. In: Proceedings of the 58th IEEE Conference on Decision and Control (CDC), pp. 3762–3769, Nice, France, December 11-13. DOI: 10.1109/CDC40024.2019.9029651.

Ritschel, T.K.S., Boiroux, D., Nielsen, M.K., Huusom, J.K., Jørgensen, S.B., Jørgensen, J.B., 2019. Economic Optimal Control of a U-loop Bioreactor using Simultaneous Collocation-based Approaches. In: Proceedings of the 3rd IEEE Conference on Control Technology and Applications (CCTA), pp. 933–938, Hong Kong, China, August 19-21. DOI: 10.1109/CCTA.2019.8920479.

Ritschel, T.K.S., Boiroux, D., Nielsen, M.K., Huusom, J.K., Jørgensen, S.B., Jørgensen, J.B., 2019. The Extended Kalman Filter for Nonlinear State Estimation in a U-loop Bioreactor. In: Proceedings of the 3rd IEEE Conference on Control Technology and Applications (CCTA), pp. 920–925, Hong Kong, China, August 19-21. DOI: 10.1109/CCTA.2019.8920643.

Hørsholt, A., Christiansen, L.H., Ritschel, T.K.S., Meyer, K., Huusom, J.K., Jørgensen, J.B., 2019. State and Input Estimation of Nonlinear Chromatographic Processes. In: Proceedings of the 3rd IEEE Conference on Control Technology and Applications (CCTA), pp. 1030–1035, Hong Kong, China, August 19-21. DOI: 10.1109/CCTA.2019.8920651.

Ritschel, T.K.S., Jørgensen, J.B., 2019. Nonlinear Model Predictive Control for Disturbance Rejection in Isoenergetic-isochoric Flash Processes. IFAC-PapersOnLine 52(1), pp. 796–801. DOI: 10.1016/j.ifacol.2019.06.159.

2018 (4)

Ritschel, T.K.S., Jørgensen, J.B., 2018. Nonlinear Filters for State Estimation of UV Flash Processes. In: Proceedings of the 2nd IEEE Conference on Control Technology and Applications (CCTA), pp. 1753–1760, Copenhagen, Denmark, August 21-24. DOI: 10.1109/CCTA.2018.8511532.

Ritschel, T.K.S., Jørgensen, J.B., 2018. The Extended Kalman Filter for State Estimation of Dynamic UV Flash Processes. IFAC-PapersOnLine 51(8), pp. 164–169. DOI: 10.1016/j.ifacol.2018.06.372.

Ritschel, T.K.S., Jørgensen, J.B., 2018. Computation of Phase Equilibrium in Reservoir Simulation and Optimization. IFAC-PapersOnLine 51(8), pp. 94–101. DOI: 10.1016/j.ifacol.2018.06.361.

Ritschel, T.K.S., Jørgensen, J.B., 2018. Production Optimization of a Rigorous Thermal and Compositional Reservoir Flow Model. IFAC-PapersOnLine 51(8), pp. 76–81. DOI: 10.1016/j.ifacol.2018.06.358.

2017 (5)

Ritschel, T.K.S., Capolei, A., Jørgensen, J.B., 2017. The Adjoint Method for Gradient-based Dynamic Optimization of UV Flash Processes. Computer Aided Chemical Engineering 40, pp. 2071–2076. DOI: 10.1016/B978-0-444-63965-3.50347-0.

Drejer, A., Ritschel, T.K.S., Jørgensen, S.B., Jørgensen, J.B., 2017. Economic Optimizing Control for Single-Cell Protein Production in a U-loop Reactor. Computer Aided Chemical Engineering 40, pp. 1759–1764. DOI: 10.1016/B978-0-444-63965-3.50295-6.

Gaspar, J., Ritschel, T.K.S., Jørgensen, J.B., 2017. An Efficient and Rigorous Thermodynamic Library and Optimal-control of a Cryogenic Air Separation Unit. Computer Aided Chemical Engineering 40, pp. 1543–1548. DOI: 10.1016/B978-0-444-63965-3.50259-2.

Ritschel, T.K.S., Gaspar, J., Jørgensen, J.B., 2017. A Thermodynamic Library for Simulation and Optimization of Dynamic Processes. IFAC-PapersOnLine 50(1), pp. 3542–3547. DOI: 10.1016/j.ifacol.2017.08.951.

Ritschel, T.K.S., Capolei, A., Jørgensen, J.B., 2017. Dynamic Optimization of UV Flash Processes. In: Proceedings of Foundations of Computer Aided Process Operations / Chemical Process Control 2017 (FOCAPO/CPC), January 8-12, Tucson, Arizona, USA. Link.

Additional conference publications (2)

2019 (1)

Mahmoudi, Z., Boiroux, D., Ritschel, T.K.S., Jørgensen, J.B., 2019. Filtering and Prediction of the Blood Glucose Concentration using an Android Smart Phone and a Continuous Glucose Monitor. arXiv: 1908.10234v1.

2018 (1)

Ritschel, T.K.S., Jørgensen, J.B., 2018. Production Optimization of Thermodynamically Rigorous Isothermal and Compositional Models. In: Proceedings of the 16th European Conference on the Mathematics of Oil Recovery (ECMOR), pp. 1–13, September 3-6, Barcelona, Spain. DOI: 10.3997/2214-4609.201802112.