Sören Hohmann

ORCID: 0000-0002-4170-1431
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About
Contact & Profiles
Research Areas
  • Human-Automation Interaction and Safety
  • Advanced Control Systems Optimization
  • Microgrid Control and Optimization
  • Control Systems and Identification
  • Autonomous Vehicle Technology and Safety
  • Adaptive Dynamic Programming Control
  • Smart Grid Energy Management
  • Reinforcement Learning in Robotics
  • Traffic control and management
  • Control and Stability of Dynamical Systems
  • Vehicle Dynamics and Control Systems
  • Real-time simulation and control systems
  • Integrated Energy Systems Optimization
  • Advanced Control Systems Design
  • Electric and Hybrid Vehicle Technologies
  • Robotic Path Planning Algorithms
  • Advanced Battery Technologies Research
  • Fault Detection and Control Systems
  • Optimal Power Flow Distribution
  • Adaptive Control of Nonlinear Systems
  • Power System Optimization and Stability
  • Fractional Differential Equations Solutions
  • Motor Control and Adaptation
  • Electric Vehicles and Infrastructure
  • Iterative Learning Control Systems

Karlsruhe Institute of Technology
2016-2025

Bristol Robotics Laboratory
2023

University of Birmingham
2023

École Polytechnique Fédérale de Lausanne
2021

Technical University of Applied Sciences Wildau
2021

Deutsche Nationalbibliothek
2017

Institut für Automatisierung und Informatik
2017

North China Electric Power University
2015

In this paper, a cooperative shared control driver assistance system that supports the in steering task is proposed. The aim behind concept cooperation between and system. Thereby, both, system, can apply torque on wheel. Mathematically, structure described as differential game. As primary condition to facilitate cooperation, it essential explicitly regard aims actions of for calculation optimal torque, which should apply. This requires an appropriate model human driver. A describes motion...

10.1109/thms.2017.2700435 article EN IEEE Transactions on Human-Machine Systems 2017-05-16

The increasing need to slow down climate change for environmental protection demands further advancements toward regenerative energy and sustainable mobility. While individual mobility applications are assumed be satisfied with improving battery electric vehicles (BEVs), the growing sector of freight transport heavy-duty requires alternative solutions meet requirements long ranges high payloads. Fuel cell hybrid (FCHEVs) emerge as a capable technology high-energy applications. This comprises...

10.1109/jproc.2021.3055136 article EN cc-by Proceedings of the IEEE 2021-02-10

A quantitative model-based comparison of ten active balancing circuits is presented for equalizing imbalanced cell energies lithium-ion batteries. mean current model approach used to describe energy transfers between battery cells long charge/discharge operations. Thévenin 96 as part a mid-size electric vehicle. In quasi-static simulations, FTP75 driving cycles are continuously repeated until the first discharged from initial full charge. Simulation results compared cases new and aged with...

10.1109/tvt.2016.2633499 article EN IEEE Transactions on Vehicular Technology 2016-12-01

Driven by global environmental emission issues, energy access in remote communities, and tighter requirements for system resilience reliability, electricity production is shifting from a centralized paradigm to decentralized one. In this context, renewable sources (RESs) have proliferated over the past decade, exhibiting steadily increasing trend. Thus, today, large number of wind turbines photovoltaic (PV) panels are connected medium- (1-69 kV) low-voltage (=1 grids, with traditional...

10.1109/mpe.2017.2708863 article EN IEEE Power and Energy Magazine 2017-08-17

We consider the problem of computing parameters player cost functionals such that given state and control trajectories constitute an open-loop Nash equilibrium for a noncooperative differential game. propose two methods solving this inverse game novel conditions under which our compute unique cost-functional parameters. Our are analogous to persistence excitation in adaptive parameter estimation. The efficacy is illustrated simulations.

10.1109/tac.2019.2921835 article EN IEEE Transactions on Automatic Control 2019-06-11

In this article, we propose a novel four-stage distributed controller for dc microgrid that achieves proportional power sharing and average voltage regulation the voltages at actuated unactuated buses. The is presented comprising multiple generation units (DGUs) with time-varying actuation states, dynamic <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$RLC$</tex-math> </inline-formula> lines, nonlinear...

10.1109/tcst.2024.3372308 article EN cc-by IEEE Transactions on Control Systems Technology 2024-03-12

In this paper, the impact of electric thermal storage (ETS) systems on operation Northern Communities' microgrids is analyzed. A mathematical model ETS system developed and integrated into an energy management (EMS) for isolated microgrids, in which problem divided unit commitment optimal power flow subproblems, to dispatch fossil-fuel-based generators, systems, charging. To account deviations forecast renewables, a predictive control technique used. The proposed ETS-EMS framework tested...

10.1109/tsg.2017.2754239 article EN IEEE Transactions on Smart Grid 2017-09-18

This letter addresses the inverse problem of differential games, where aim is to compute cost functions which lead observed Nash equilibrium trajectories. The solution this allows generation a model for inferring intent several agents interacting with each other. We present method find all same in an infinite-horizon linear-quadratic (LQ) game. approach relies on reformulation coupled matrix Riccati equations arise out necessary and sufficient conditions equilibria. Furthermore, based our...

10.1109/lcsys.2019.2919271 article EN IEEE Control Systems Letters 2019-05-27

Several publications have shown that it is beneficial to design a driver assistance system using shared control structure. For the steering task this structure can be realized with setup in which and automation apply torque on wheel parallel. Thereby both, system, interact vehicle each other over haptical channel. In given cannot changed. The question how controller as an ideal complement driver. paper formal concept applied problem utilizes fact adding overall has lead Nash equilibrium....

10.1109/smc.2014.6974486 article EN 2022 IEEE International Conference on Systems, Man, and Cybernetics (SMC) 2014-10-01

This paper presents research on inverse optimal control in non-cooperative differential games. An optimization framework for the identification of an unknown objective function a game's participant is introduced. The identified yields same trajectories as ground truth function. We apply presented methods human-machine cooperation scenario, where human behavior indispensable automation design. framework's are evaluated through simulation driver cooperating with driving assistance system based...

10.1016/j.ifacol.2017.08.2538 article EN IFAC-PapersOnLine 2017-07-01

The theory of dynamic games has received considerable attention in a wide range fields. While great effort been made to develop new algorithms for finding Nash equilibria games, the identification cost functions little attention. We present an algorithm linear quadratic framework which can be applied field shared control between human and automatic controller. In this application, function describing behavior is identified, taking into account influence automation. Furthermore, we consider...

10.1016/j.ifacol.2017.08.2537 article EN IFAC-PapersOnLine 2017-07-01

A quantitative model-based comparison of 10 active balancing circuits is presented for equalizing imbalanced cell energies lithium-ion batteries. mean current model approach introduced to describe energy transfers between battery cells long charge/discharge operation. Th233;venin 96 used as a subsystem mid-size electric vehicle. In quasi-static simulations, FTP75 driving cycles are continuously repeated until the first discharged from initial full charge. Simulation results compared cases...

10.1109/vppc.2014.7007027 article EN 2021 IEEE Vehicle Power and Propulsion Conference (VPPC) 2014-10-01

A better integration across sectors is an essential element of 4th generation district heating and smart energy systems allowing to react volatile renewable generation. This sector coupling enables use more cost-efficient storage as prices differ for different forms energy. Thermal example can be stored in comparably cheap tanks. Besides such dedicated storage, the thermal inertia a grid used well. In this paper, classic unit commitment optimization scheduling combined heat power units not...

10.3390/en12020266 article EN cc-by Energies 2019-01-16

In order to fully exploit the advantages inherent cooperating heterogeneous multi-robot teams, sophisticated coordination algorithms are essential. Time-extended task allocation approaches assign and schedule a set of tasks group robots such that certain objectives optimized operational constraints met. This is particularly challenging if cooperative tasks, i.e. require two or more work directly together, considered. this paper, we present an easy-to-implement criterion validate feasibility,...

10.1109/smc42975.2020.9283215 article EN 2022 IEEE International Conference on Systems, Man, and Cybernetics (SMC) 2020-10-11

This paper presents a systematic method for the design of limited information shared control (LISC). LISC is used in applications where not all system states or reference trajectories are measurable by automation. Typical examples partially human-controlled systems, which some subsystems fully controlled automation while others human. The proposed uses novel class games to model human-machine interaction: near potential differential (NPDG). We provide necessary and sufficient condition...

10.1109/thms.2022.3216789 article EN IEEE Transactions on Human-Machine Systems 2022-11-10

A fundamental precondition for the operation of district heating networks (DHNs) is a stable hydraulic behavior. However, ongoing transition toward sustainable heat supply, especially rising integration distributed sources and increasingly meshed topologies, introduces complex potentially destabilizing dynamics. In this work, we propose unifying, equilibrium-independent passivity (EIP)-based control framework, which guarantees asymptotic stability any feasible, DHN equilibrium wide range...

10.1109/tcst.2024.3365250 article EN cc-by IEEE Transactions on Control Systems Technology 2024-02-21

10.23919/ecc64448.2024.10591104 article EN 2022 European Control Conference (ECC) 2024-06-25

Abstract This paper considers a fractional modelbased identification method with the objective to determine aging of battery cell. The avoids lumped approximations operator. Moreover this approach it is possible identify physically motivated cell parameters. basic idea transfer derivatives from measurements so called modulating functions. With help simulations robust behavior against measurement noise shown. It use for online identification.

10.1515/auto-2014-1083 article EN at - Automatisierungstechnik 2014-03-28

In a shared control system humans and machines cooperatively interact. From the theoretic point of view this can be seen as which is controlled by several controllers that are either formed human or machine. Since all influence they affect each other. However, parts given cannot changed. Therefore, question how to design non-human controller systematically stable without experiments. paper concept for these proposed based on game modeling. We show adding overall has lead Nash equilibrium....

10.1109/smc.2014.6974086 article EN 2022 IEEE International Conference on Systems, Man, and Cybernetics (SMC) 2014-10-01

In this paper, an algebraic model-based approach for the identification of a battery's distribution relaxation times (DRT) is illustrated. The DRT directly linked to physically interpretable parameters determine aging battery cell. derives from Mikusiński's operational calculus. Therefore novel integration operator and differentiation rule fractional systems presented. exact in that no approximations are used. procedure verified by simulation results.

10.1109/cdc.2015.7402517 article EN 2021 60th IEEE Conference on Decision and Control (CDC) 2015-12-01

Summary Recently proposed adaptive dynamic programming (ADP) tracking controllers assume that the reference trajectory follows time‐invariant exo‐system dynamics—an assumption does not hold for many applications. In order to overcome this limitation, we propose a new Q‐function explicitly incorporates parametrized approximation of trajectory. This allows learning track general class trajectories by means ADP. Once our has been learned, associated controller handles time‐varying without need...

10.1002/acs.3106 article EN cc-by International Journal of Adaptive Control and Signal Processing 2020-03-03
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