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Jan Engelhardt was born in Heidelberg, Germany, in 1991. He received both his B.Sc. and M.Sc. degree in electrical engineering and information technology with a specialization in electric power engineering from the Technische Universität Darmstadt in 2014 and 2017, respectively. Previously, he held positions in academia and industry focused on smart charging solutions for electric vehicles. Since 2019, Jan has been with the Technical University of Denmark, where he currently works as a PhD student on coordinated control strategies for stationary battery systems and electric vehicles. His research interests include distributed energy resources, storage technologies, and demand-side management.
Biogas plants may support the transformation towards renewable-based and integrated energy systems by providing dispatchable co-generation as well as opportunities for biogas upgrading or power-to-X conversion. In this paper, a simulation model that comprises the main dynamics of the internal processes of a biogas plant is developed. Based on first-order kinetics of the anaerobic digestion process, the biogas production of an input feeding schedule of raw material can be estimated. The output of the plant in terms of electrical and thermal energy is validated against empirical data from a 3-MW biogas plant on the Danish island of Bornholm. The results show that the model provides an accurate representation of the processes within a biogas plant. The paper further provides insights on the functioning of the biogas plant on Bornholm as well as discusses upgrading potentials of biogas to biomethane at the plant from an energy perspective.
Jan Zepter; Jan Engelhardt; Tatiana Gabderakhmanova; Mattia Marinelli. Empirical Validation of a Biogas Plant Simulation Model and Analysis of Biogas Upgrading Potentials. Energies 2021, 14, 2424 .
AMA StyleJan Zepter, Jan Engelhardt, Tatiana Gabderakhmanova, Mattia Marinelli. Empirical Validation of a Biogas Plant Simulation Model and Analysis of Biogas Upgrading Potentials. Energies. 2021; 14 (9):2424.
Chicago/Turabian StyleJan Zepter; Jan Engelhardt; Tatiana Gabderakhmanova; Mattia Marinelli. 2021. "Empirical Validation of a Biogas Plant Simulation Model and Analysis of Biogas Upgrading Potentials." Energies 14, no. 9: 2424.
This paper introduces a novel design of an electric vehicle (EV) fast charging station, consisting of a battery energy storage system (BESS) with reconfigurable cell topology. The BESS comprises two battery strings that decouple the power flow between EV and grid, to enable charging powers above the grid capacity. The reconfigurable design is achieved by equipping the battery cells with semiconductor switches and serves two main purposes. First, it aims at solving cell unbalance issues to increase safety, reliability, and lifetime of the battery. Second, it enables the BESS to actively control the EV charging process by changing its cell configuration in a real-time fashion, making a DC-DC converter redundant. The paper presents a modelling approach that captures the reconfigurable design including the controlling algorithm used for cell engagement. The simulation results show that the BESS is able to fulfil the EV request with sufficient accuracy for most of the fast charging process. However, the switching of cells leads to variations in the charging current that can potentially exceed the tolerance band defined in IEC61851-23. Therefore, complementary measures are suggested to achieve a suitable current control during all phases of the charging process. The estimated BESS efficiency during the EV fast charging process is
Jan Engelhardt; Jan Zepter; Tatiana Gabderakhmanova; Gunnar Rohde; Mattia Marinelli. Double-String Battery System with Reconfigurable Cell Topology Operated as a Fast Charging Station for Electric Vehicles. Energies 2021, 14, 2414 .
AMA StyleJan Engelhardt, Jan Zepter, Tatiana Gabderakhmanova, Gunnar Rohde, Mattia Marinelli. Double-String Battery System with Reconfigurable Cell Topology Operated as a Fast Charging Station for Electric Vehicles. Energies. 2021; 14 (9):2414.
Chicago/Turabian StyleJan Engelhardt; Jan Zepter; Tatiana Gabderakhmanova; Gunnar Rohde; Mattia Marinelli. 2021. "Double-String Battery System with Reconfigurable Cell Topology Operated as a Fast Charging Station for Electric Vehicles." Energies 14, no. 9: 2414.
The accumulation of surface charges is a crucial challenge, especially for HVDC components. Accumulated surface charges can change the electric field distribution and generate weak points, especially in case of superimposed transient voltages and, therefore lower the performance e.g. of insulators. Hence, an accurate measurement of the surface potential and so the surface charges is necessary to optimize these components. Commonly, the surface potential is measured with an electrostatic voltmeter. In this study a procedure for determining the spatial impulse response of a compensating electrostatic voltmeter depending on only the surface to probe distance is presented. Based on the performed measurements a mathematical model is developed to describe the capacitive influence and significance of the local surface potential on the measurement result. The actual measurement value is a weighted and averaged value given by the actual position and its surrounding, which is also confirmed by numerical simulations. The performed procedure enables high accuracy of the measurement of surface potentials and so of surface charges using different types of electrostatic voltmeters and shows the limitation of the measurement procedure. This knowledge increases the possibility to design optimized components for HVDC systems.
Jens-Michael Löwe; Jan Engelhardt; Maximilian Secklehner; Volker Hinrichsen. Determination of the spatial impulse response of compensating electrostatic voltmeters. IEEE Transactions on Dielectrics and Electrical Insulation 2020, 27, 49 -57.
AMA StyleJens-Michael Löwe, Jan Engelhardt, Maximilian Secklehner, Volker Hinrichsen. Determination of the spatial impulse response of compensating electrostatic voltmeters. IEEE Transactions on Dielectrics and Electrical Insulation. 2020; 27 (1):49-57.
Chicago/Turabian StyleJens-Michael Löwe; Jan Engelhardt; Maximilian Secklehner; Volker Hinrichsen. 2020. "Determination of the spatial impulse response of compensating electrostatic voltmeters." IEEE Transactions on Dielectrics and Electrical Insulation 27, no. 1: 49-57.