Search Results for author: Sören Hohmann

Found 17 papers, 0 papers with code

Human-Variability-Respecting Optimal Control for Physical Human-Machine Interaction

no code implementations6 May 2024 Sean Kille, Paul Leibold, Philipp Karg, Balint Varga, Sören Hohmann

Physical Human-Machine Interaction plays a pivotal role in facilitating collaboration across various domains.

Passivation of Clustered DC Microgrids with Non-Monotone Loads

no code implementations30 Apr 2024 Albertus Johannes Malan, Joel Ferguson, Michele Cucuzzella, Jacquelien M. A. Scherpen, Sören Hohmann

In this paper, we consider the problem of voltage stability in DC networks containing uncertain loads with non-monotone incremental impedances and where the steady-state power availability is restricted to a subset of the buses in the network.

Socially Integrated Navigation: A Social Acting Robot with Deep Reinforcement Learning

no code implementations14 Mar 2024 Daniel Flögel, Lars Fischer, Thomas Rudolf, Tobias Schürmann, Sören Hohmann

In addition, we propose a novel socially integrated navigation approach where the robot's social behavior is adaptive and emerges from the interaction with humans.

Collision Avoidance

ReACT: Reinforcement Learning for Controller Parametrization using B-Spline Geometries

no code implementations10 Jan 2024 Thomas Rudolf, Daniel Flögel, Tobias Schürmann, Simon Süß, Stefan Schwab, Sören Hohmann

We focus on the control of parameter-variant systems, a class of systems with complex behavior which depends on the operating conditions.

reinforcement-learning Scheduling

Passivity-based economic ports for optimal operation of networked DC microgrids

no code implementations5 Aug 2023 Pol Jané-Soneira, Albertus J. Malan, Ionela Prodan, Sören Hohmann

This interconnection scheme requires only an exchange of the local prices and allows a globally economic optimal operation of networked microgrids at steady state, while guaranteeing asymptotic stability of the networked microgrids via the passivity properties of economic ports.

Cooperative Decision-Making in Shared Spaces: Making Urban Traffic Safer through Human-Machine Cooperation

no code implementations26 Jun 2023 Balint Varga, Dongxu Yang, Sören Hohmann

The novelties of this paper are the adaptation of a general cooperative and shared control framework to this novel use case and the application of an explicit prediction model of the pedestrian.

Autonomous Vehicles Decision Making

A Unifying Passivity-Based Framework for Pressure and Volume Flow Rate Control in District Heating Networks

no code implementations20 May 2023 Felix Strehle, Juan E. Machado, Michele Cucuzzella, Albertus J. Malan, Jacquelien M. A. Scherpen, Sören Hohmann

A fundamental precondition for the secure and efficient operation of district heating networks (DHNs) is a stable hydraulic behavior.

On MPC-based Strategies for Optimal Voltage References in DC Microgrids

no code implementations26 Apr 2023 Pol Jané-Soneira, Ionela Prodan, Albertus Johannes Malan, Sören Hohmann

Modern power systems are characterized by low inertia and fast voltage dynamics due to the increase of sources connecting via power electronics and the removal of large traditional thermal generators.

Model Predictive Control

Port-Hamiltonian Modelling for Analysis and Control of Gas Networks

no code implementations3 Apr 2023 Albertus J. Malan, Lukas Rausche, Felix Strehle, Sören Hohmann

The proposed pipeline and network models can serve as a basis for passivity-based control and analysis while the power system parallels facilitate the transfer of existing methods.

Passivity-based power sharing and voltage regulation in DC microgrids with unactuated buses

no code implementations31 Jan 2023 Albertus Johannes Malan, Pol Jané-Soniera, Felix Strehle, Sören Hohmann

In this paper, we propose a novel four-stage distributed controller for a DC microgrid that achieves power sharing and average voltage regulation for the voltages at actuated and unactuated buses.

Toward Transactive Control of Coupled Electric Power and District Heating Networks

no code implementations4 Nov 2022 Jona Maurer, Nicolai Tschuch, Stefan Krebs, Kankar Bhattacharya, Claudio Cañizares, Sören Hohmann

Transactive control has been developed as a promising approach based on market and control mechanisms to coordinate supply and demand in energy systems, which when applied to power systems is being referred to as transactive energy.

Model Predictive Control

A Unified Passivity-Based Framework for Control of Modular Islanded AC Microgrids

no code implementations6 Apr 2021 Felix Strehle, Pulkit Nahata, Albertus Johannes Malan, Sören Hohmann, Giancarlo Ferrari-Trecate

Voltage and frequency control in an islanded AC microgrid (ImGs) amount to stabilizing an a priori unknown ImG equilibrium induced by loads and changes in topology.

Adaptive Optimal Trajectory Tracking Control Applied to a Large-Scale Ball-on-Plate System

no code implementations26 Oct 2020 Florian Köpf, Sean Kille, Jairo Inga, Sören Hohmann

Therefore, we design an ADP-based optimal trajectory tracking controller and apply it to a large-scale ball-on-plate system.

Deep Decentralized Reinforcement Learning for Cooperative Control

no code implementations29 Oct 2019 Florian Köpf, Samuel Tesfazgi, Michael Flad, Sören Hohmann

In order to collaborate efficiently with unknown partners in cooperative control settings, adaptation of the partners based on online experience is required.

Multi-agent Reinforcement Learning reinforcement-learning +1

Adaptive Dynamic Programming for Model-free Tracking of Trajectories with Time-varying Parameters

no code implementations16 Sep 2019 Florian Köpf, Simon Ramsteiner, Michael Flad, Sören Hohmann

We conclude our paper with an example which demonstrates that our new method successfully learns the optimal tracking controller and outperforms existing approaches in terms of tracking error and cost.

Partner Approximating Learners (PAL): Simulation-Accelerated Learning with Explicit Partner Modeling in Multi-Agent Domains

no code implementations9 Sep 2019 Florian Köpf, Alexander Nitsch, Michael Flad, Sören Hohmann

Mixed cooperative-competitive control scenarios such as human-machine interaction with individual goals of the interacting partners are very challenging for reinforcement learning agents.

reinforcement-learning Reinforcement Learning (RL)

Adaptive Optimal Control for Reference Tracking Independent of Exo-System Dynamics

no code implementations12 Jun 2019 Florian Köpf, Johannes Westermann, Michael Flad, Sören Hohmann

This paper provides for the first time an adaptive optimal control method capable to track reference trajectories not being generated by a time-invariant exo-system.

Autonomous Driving reinforcement-learning +1

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