
Dr.-Ing. Stefan Krebs
- Group Leader Alternative Energy Systems
- Group:
- Room: 104
- Phone: +49 721 608 - 42462
- Fax: +49 721 608 - 42707
- stefan krebs ∂does-not-exist.kit edu
Karlsruher Institut für Technologie (KIT)
Campus Süd
Institut für Regelungs- und Steuerungssysteme
Geb. 11.20 (Engler-Villa)
Kaiserstr. 12
D-76131 Karlsruhe
Curriculum Vitae
Studies of mechatronics at the university of applied sciences Offenburg (Bachelor of Engineering 2011). Subsequently, studies of electrical engineering/ information technology (Master of Science 2012). Masters thesis at SEW-EURODRIVE GmbH & Co. KG , topic: „Design and implementation of a control for a three-phase power regeneration system based on a disturbance observer”. Other practical activities during the studies at the Hiwin GmbH and the SICK AG. From 2012 until 2017 research assistant at the IRS. From 2014 until 2016 assistant lecturer at the university of applied sciences Heilbronn. Since 2018 leader of the research group for Alternative Energy Systems at the IRS.
Research
Taking a look at the expected changes in the energy system (of Germany), one can already see emerging technical challenges today. Due to the reduction of big generation plants, for example due to the nuclear phaseout and the increasing number of solar and wind farms, the decentralization of the generation is proceeding. Additionally, those renewable source have the property that the amount of energy that is produced far away from the consumers is increasing and that this production is volatile. A further challenge consists in the loss of the rotating masses of the big power plants which had a stabilizing effect on the line frequency.
However, the change of the energy system offers also some new flexibilities. For instance, an increasing coupling between the electricity sector, the heat sector and the gas sector can be expected. Additionally, an increase in the number of battery storage systems installed in combination with PV systems or as storages for electric drives can be observed.
The research group for Alternative Energy Systems is developing methods which use those new flexibilities to meet the arising challenges.
Besides of the operation of those multi-carrier energy systems, the safe operation of battery storage systems is one of the main foci of the research activities.
Publications
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Toward transactive control of coupled electric power and district heating networks
Maurer, J.; Tschuch, N.; Krebs, S.; Bhattacharya, K.; Cañizares, C.; Hohmann, S.
2023. Applied Energy, 332, Art.-Nr.: 120460. doi:10.1016/j.apenergy.2022.120460
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Toward Transactive Control of Coupled Electric Power and District Heating Networks
Maurer, J.; Tschuch, N.; Krebs, S.; Bhattacharya, K.; Cañizares, C.; Hohmann, S.
2022. arxiv. doi:10.48550/ARXIV.2211.02357
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Guaranteed state estimation using a bundle of interval observers with adaptive gains applied to the induction machine
Schwartz, M.; Krebs, S.; Hohmann, S.
2021. Sensors, 21 (8), Art.-Nr.: 2584. doi:10.3390/s21082584
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Explicit port-Hamiltonian formulation of bond graphs with dependent storages
Pfeifer, M.; Caspart, S.; Muller, C.; Pfeiffer, S.; Krebs, S.; Hohmann, S.
2020. Proceedings of the 21st IFAC World Congress. Ed.: R. Findeisen, 5579–5585, International Federation of Automatic Control (IFAC). doi:10.1016/j.ifacol.2020.12.1570 -
Explicit port-Hamiltonian formulation of multi-bond graphs for an automated model generation
Pfeifer, M.; Caspart, S.; Hampel, S.; Muller, C.; Krebs, S.; Hohmann, S.
2020. Automatica, 120, Art. Nr.: 109121. doi:10.1016/j.automatica.2020.109121 -
Passivity conditions for plug-and-play operation of nonlinear static AC loads
Strehle, F.; Malan, A. J.; Krebs, S.; Hohmann, S.
2020 -
Passivity conditions for plug-and-play operation of nonlinear static AC loads
Strehle, F.; Malan, A. J.; Krebs, S.; Hohmann, S.
2020. 21th IFAC World Congress. Ed.: R. Findeisen, 12237–12243, Elsevier. doi:10.1016/j.ifacol.2020.12.1128 -
Distributed Frequency and Voltage Control for AC Microgrids based on Primal-Dual Gradient Dynamics
Kölsch, L.; Wieninger, K.; Krebs, S.; Hohmann, S.
2020. IFAC-PapersOnLine, 53 (2), 12229–12236. doi:10.1016/j.ifacol.2020.12.1110 -
A scalable port-hamiltonian approach to plug-and-play voltage stabilization in DC microgrids
Strehle, F.; Pfeifer, M.; Malan, A. J.; Krebs, S.; Hohmann, S.
2020 -
A scalable port-hamiltonian approach to plug-and-play voltage stabilization in DC microgrids
Strehle, F.; Pfeifer, M.; Malan, A. J.; Krebs, S.; Hohmann, S.
2020. 2020 IEEE Conference on Control Technology and Applications (CCTA), 24-26 August 2020, online, 787–794, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/CCTA41146.2020.9206323 -
Bias-free Parameter Identification for Non-Commensurable Fractional Systems
Stark, O.; Pfeifer, M.; Krebs, S.; Hohmann, S.
2020. 18th European Control Conference, ECC 2020, Saint Petersburg, Russian Federation, 12 - 15 May 2020, 1422–1429, EUCA -
Distributed Frequency Regulation for Heterogeneous Microgrids via Steady State Optimal Control
Kölsch, L.; Dupuis, M.; Bhatt, K.; Krebs, S.; Hohmann, S.
2020. IEEE Green Technologies Conference, GreenTech 2020, 1 - 3 April 2020, Oklahoma City, USA. doi:10.1109/GreenTech46478.2020.9289724 -
Dynamic Set-Inversion Procedure to Design Interval-Based State Estimators for Discrete-Time LPV Systems
Krebs, S.; Meslem, N.; Hohmann, S.
2020. 58th IEEE Conference on Decision and Control (CDC 2019), Nice, F, December 11-13, 2019, 3190–3195, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/CDC40024.2019.9029661 -
Interval Input-State-Output Estimation for Linear Port-Hamiltonian Systems with Application to Power Distribution Systems
Pfeifer, M.; Krebs, S.; Hofmann, F.; Kupper, M.; Hohmann, S.
2020. 58th IEEE Conference on Decision and Control (CDC), Nice, F, December 11-13, 2019, 3176–3183, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/CDC40024.2019.9029590 -
Computation of Orders of a Commensurable Fractional Order Model
Stark, O.; Kupper, M.; Krebs, S.; Hohmann, S.
2020. 58th IEEE Conference on Decision and Control (CDC), Nice, F, December 11-13, 2019, 784–790, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/CDC40024.2019.9029742
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Current and State of Charge Estimation of Lithium-Ion Battery Packs Using Distributed Fractional Extended Kalman Filters
Kupper, M.; Creutz, A.; Stark, O.; Krebs, S.; Hohmann, S.
2019. IEEE CCTA 2019, 462–469, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/CCTA.2019.8920558 -
Steady-State Optimal Frequency Control for Lossy Power Grids with Distributed Communication
Kölsch, L.; Bhatt, K.; Krebs, S.; Hohmann, S.
2019. IEEE International Conference on Electrical, Control and Instrumentation Engineering (ICECIE). Proceedings, 1–8, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/ICECIE47765.2019.8974715 -
Unknown Input Kalman Filtering for Linear Discrete-Time Fractional Order Systems With Direct Feedthrough [in press]
Kupper, M.; Pfeifer, M.; Krebs, S.; Hohmann, S.
2019. European Control Conference (ECC), Naples, Italy, 25–28 June 2019, Institute of Electrical and Electronics Engineers (IEEE) -
On Robustness Regarding Modeling Errors in Predictive Energy Management Systems for Multi-Carrier Energy Grids
Sauter, P. S.; Herkner, T.; Maurer, J.; Krebs, S.; Hohmann, S.
2019. International ETG-Congress 2019; ETG Symposium, Esslingen, Germany, 8-9 May 2019, 266–271, VDE Verlag -
Bias-free Parameter Identification of a Fractional Order Model
Stark, O.; Malan, A. J.; Krebs, S.; Hohmann, S.
2019. doi:10.5445/IR/1000117548 -
A Port-Hamiltonian Approach to Plug-And-Play Voltage and Frequency Control in Islanded Inverter-Based AC Microgrids
Strehle, F.; Malan, A. J.; Krebs, S.; Hohmann, S.
2019. 58th IEEE Conference on Decision and Control (CDC), Nice, F, December 11-13, 2019 -
Automated Generation of Explicit Port-Hamiltonian Models from Multi-Bond Graphs
Pfeifer, M.; Caspart, S.; Pfeiffer, S.; Muller, C.; Krebs, S.; Hohmann, S.
2019. doi:10.5445/IR/1000104388 -
AMOTO: Automatic MOdeling TOol for the Port-Hamiltonian Formulation of Bond Graphs
Pfeiffer, S.; Muller, C.; Pfeifer, M.; Caspart, S.; Krebs, S.; Hohmann, S.
2019. VDI/VDE GMA-Fachausschuss 1.30 „Modellbildung, Identifikation und Simulation in der Automatisierungstechnik“. Tagung (2019), Anif, Austria, September 25–27, 2019 -
Explicit Port-Hamiltonian Formulation of Bond Graphs
Pfeifer, M.; Pfeiffer, S.; Caspart, S.; Muller, C.; Krebs, S.; Hohmann, S.
2019. GMA-Fachausschuss 1.30 „Modellbildung, Identifikation und Simulation in der Automatisierungstechnik“, Anif, A, 25.-27. September 2019, VDI/VDE-Gesellschaft Mess- und Automatisierungstechnik -
Unknown input kalman filtering for linear discrete-time fractional order systems with direct feedthrough
Kupper, M.; Pfeifer, M.; Krebs, S.; Hohmann, S.
2019. 2019 18th European Control Conference (ECC), Napoli, Italy, June 25-28, 2019, 1848–1853, Institute of Electrical and Electronics Engineers (IEEE). doi:10.23919/ECC.2019.8795817 -
An Extension of the Modulating Function Method for Online Parameter Identification of Initialized Fractional Order Models
Stark, O.; Kupper, M.; Krebs, S.; Hohmann, S.
2019. 2019 International Conference on Fractional Calculus Theory and Applications (ICFCTA 2019), Bourges, F, April 25-26, 2019 -
Passivity-Based Plug-and-Play Voltage and Frequency Control in Islanded Inverter-Based AC Microgrids
Strehle, F.; Malan, A. J.; Krebs, S.; Hohmann Sören
2019. 58th IEEE Conference on Decision and Control, Nice, F, December 11-13, 2019, 4648–4655, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/CDC40024.2019.9029272 -
Automatic Determining of a Modulating Function
Stark, O.; Eckert, M.; Krebs, S.; Hohmann, S.
2019. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000092062 -
Interval Set-Membership State Estimator for Discrete-Time LPV Systems
Krebs, S.; Hohmann, S.
2019. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000091545 -
A Scalable Port-Hamiltonian Approach to Plug-and-Play Voltage Stabilization in DC Microgrids [submitted]
Strehle, F.; Pfeifer, M.; Krebs, S.; Hohmann, S.
2019. IFAC-PapersOnLine [submitted] -
Online Parameter Identification of a Fractional Order Model
Stark, O.; Kupper, M.; Krebs, S.; Hohmann, S.
2019. 57th IEEE Conference on Decision and Control (CDC 2018), Miami, FL, December 17-19, 2018, 2303–2309, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/CDC.2018.8619723
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Coupled boundary interval observer for LPV systems subject to uncertainties in input, output and parameters
Krebs, S.; Bächle, M.; Hohmann, S.
2018. Automatica, 95, 426–432. doi:10.1016/j.automatica.2018.06.012 -
Cascaded Fractional Kalman Filtering for State and Current Estimation of Large-Scale Lithium-Ion Battery Packs
Kupper, M.; Brenneisen, J.; Stark, O.; Krebs, S.; Hohmann, S.
2018. 2018 Chinese Control And Decision Conference (CCDC), 5071–5078, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/CCDC.2018.8408010 -
Weighted Least Squares State Estimation for Coupled Power and Gas Distribution Networks
Pfeifer, M.; Zimmerlin, M.; Schwarzendorfer, M.; Sauter, P.; Krebs, S.; Leibfried, T.; Hohmann, S.
2018. 53rd International Universities Power Engineering Conference, Glasgow, Scotland, 4th-7th September 2018, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/UPEC.2018.8542013 -
Intervallbeobachter für lineare parametervariante Systeme und deren Anwendung auf die Asynchronmaschine. PhD dissertation
Krebs, S.
2018. KIT Scientific Publishing. doi:10.5445/KSP/1000086503 -
Combined Optimization of District Heating and Electric Power Networks
Maurer, J.; Elsner, C.; Krebs, S.; Hohmann, S.
2018. Energy procedia, 149, 509–518. doi:10.1016/j.egypro.2018.08.215 -
Intervallbeobachter für lineare parametervariante Systeme und deren Anwendung auf die Asynchronmaschine. PhD dissertation
Krebs, S.
2018. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000085805 -
Interval MRAC with Proven Stability Properties and Application on Induction Motor Control
Müller, J.; Krebs, S.; Buchholz, M.; Hohmann, S.
2018. The 14th IEEE International Conference on Control and Automation (IEEE ICCA Alaska 2018), Anchorage, AK, June 12-15, 2018, 173–179, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/ICCA.2018.8444328
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Interval observers for LPV systems and application to the guaranteed state estimation of an induction machine
Krebs, S.; Gellrich, T.; Hohmann, S.
2017. IFAC-PapersOnLine, 50 (1), 2794–2799. doi:10.1016/j.ifacol.2017.08.629 -
Interval State Observer Based on a Time-Variant Transformation for LPV Systems and Application to Induction machines
Krebs, S.; Fugel, S.; Hohmann, S.
2017. 1st IEEE Conference on Control Technology and Applications, CCTA 2017, Waikoloa, Hawaii USA, 27. - 30. Aug, 2017, 1077–1084, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/CCTA.2017.8062602
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Interval Modelling of a Voltage Source Inverter
Krebs, S.; Köhrer, L.; Hohmann, S.
2016. 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016), Glasgow, United Kingdom, 19-21 April 2016, 1–6, Curran. doi:10.1049/cp.2016.0336 -
Garantierte Zustandsschätzung für Asynchronmaschinen auf Basis eines Intervallbeobachters
Krebs, S.; Hohmann, S.
2016. GMA-Fachausschuss 1.40, Workshop 2016, 21.-23.09.2016, Anif/ Salzburg -
A New Modelling and Identification Approach for Guaranteed Inclusion of a Voltage Source Inverter’s Output Voltages
Krebs, S.; Köhrer, L.; Hohmann, S.
2016. ICCAIS 2016 - International Conference on Control Automation & Information Sciences, October 27-29, 2016, Ansan, Korea, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/ICCAIS.2016.7822445 -
Interval Observer for LPV Systems Based on Time-Variant Transformations
Krebs, S.; Pfeifer, M.; Fugel, S.; Weigold, J.; Hohmann, S.
2016. 55th IEEE Conference on Decision and Control (CDC), December 12-14, 2016, Las Vegas, NV, USA, 4090–4096, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/CDC.2016.7798889 -
Reduced-order hybrid interval observer for verified state estimation of an induction machine
Krebs, S.; Schnurr, C.; Pfeifer, M.; Weigold, J.; Hohmann, S.
2016. Control engineering practice, 57, 157–168. doi:10.1016/j.conengprac.2016.09.004
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Interval observers for electrical traction drives
Krebs, S.; Hohmann, S.
2015. Summer School of Sino-EU Doctoral School for Sustainability, 18.10.-19.10.2015, Lissabon
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A Cooperative and Competitive Workshop in Mechatronics Engineering
Krebs, S.; Schmidt, S.; Matthiesen, S.; Hohmann, S.
2014. International Journal of Engineering Pedagogy, 4 (1), 13–17
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Cooperation-focused education in mechatronic engineering design projects
Schmidt, S.; Lohmeyer, Q.; Krebs, S.; Hohmann, S.; Matthiesen, S.
2013. 15th International Conference on Engineering and Product Design Education: Design Education - Growing Our Future, EPDE 2013; Dublin; Ireland; 5 - 6 September 2013: Proceedings. Ed.: E. Bohemia, 296–301, The Design Society -
Erschließung mechatronischer Synergiepotentiale durch kooperationsorientierte Lehre (koop-L)
Matthiesen, S.; Hohmann, S.; Schmidt, S.; Breitschuh, J.; Lohmeyer, Q.; Krebs, S.
2013. Standortvorteil Methodik : 11. Gemeinsames Kolloquium Konstruktionstechnik (KT 2013), 12. - 13. September 2013 in Aachen. Hrsg.: K. Brökel, Shaker Verlag