Now showing 1 - 10 of 11
  • Publication
    Open Access
    Synthetisches Lastprofil für elektrische Busbetriebshöfe
    (Helmut-Schmidt-Universität / Universität der Bundeswehr Hamburg, Fakultät für Elektrotechnik, Professur für Elektrische Energiesysteme, 2023-12) ; ; ;
    Leunig, Florian
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    Die fortlaufende Elektrifizierung der Busflotten führt zu neuen Herausforderungen, sowohl für den Flottenbetreiber als auch für das bestehende Energieversorgungssystem. Ein detailliertes Verständnis der Lastprofile der entsprechenden Busbetriebshöfe kann eventuelle Risiken mildern und zusätzlich eine Reihe von unterschiedlichen markt- und netzorientierten Use Cases ermöglichen. Die synthetischen Lastprofile bieten sich hierbei als eine gute Grundlage für die relevanten Design-, Betrieb- oder Optimierungsanalysen. Dieses Paper definiert synthetische Lastprofile der elektrischen Busbetriebshöfe, basierend auf der Analyse der 17 bestehenden Busbetriebshöfe in der Metropolregion Hamburg. Mithilfe einer Clustering-Analyse konnten drei unterschiedliche synthetische Lastprofile definiert werden, abhängig von den Charakteristiken der Busbetriebshöfe und den dazugehörigen Umläufen.
  • Publication
    Metadata only
    Flexibility Quantification and the Potential for Its Usage in the Case of Electric Bus Depots with Unidirectional Charging
    (2022-05-01) ;
    Heider, Felix
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    ;
    One of the crucial steps for a successful integration of electric bus fleets into the existing electric power systems is the active and intelligent usage of their flexibility. This is important not only for reducing the eventual negative effects on the power grid but also for reducing energy and infrastructure costs. The first step in the optimal usage of flexibility is its quantification, which al-lows the maximum provision of flexibility without any negative effects for the fleet operation. This paper explores the available flexibility of large‐scale electric bus fleets with a concept of centralized and unidirectional depot charging. An assessment of available positive and negative flexibility was conducted based on the data from two real bus depots in the city of Hamburg, Germany. The analysis shows the biggest flexibility potential was in the period from 16:00 h to 24:00 h, and the smallest one was in the periods from 08:00 h to 16:00 h, as well as from 02:00 h to 08:00 h. The paper also gives an overview of the possible markets for flexibility commercialization in Germany, which can provide an additional economic benefit for the fleet operators. A further analysis of the impact of parameters such as the timeline (working day or weekend), charging concept, ambient temperature, and electrical preconditioning provides an additional understanding of available flexibility.
  • Publication
    Metadata only
    A generic EV charging model extracted from real charging behaviour
    (IEEE, 2022-01-01)
    Heider, Felix
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    ; ;
    Troger, Konstantin
    ;
    To capture reliable information about the existing flexibility potential of electric vehicles forecasts of charging processes are required in order to allow of utilization and management of available flexibility. Measurements of vehicles from different manufacturers show a heterogeneous behaviour of charging characteristics and charging characteristic switching points when connected to 11 kW charging stations. This paper analyzes the relationship between vehicle-specific easy to identify parameters and the charging characteristics. The proposed generic model is able to capture different charging characteristics with only a small set of parameters, to generate vehicle-specific forecast profiles.
  • Publication
    Open Access
    Projekt „ELBE“ – Erprobung und Analyse des netzdienlichen Ladens
    (Universitätsbibliothek der HSU / UniBwH, 2021) ; ; ;
    Magdowski, Annika
    ;
    Wilmes, Marc
  • Publication
    Open Access
    Aufbau und Optimierung von Ladeinfrastrukturen auf Busbetriebshöfen
    (Universitätsbibliothek der HSU / UniBwH, 2021) ; ; ;
    Müller, Toralf
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    Zeun, Nina
    ;
    Hoffmann, Ole
  • Publication
    Open Access
    Abschätzung der Auswirkungen einer Umstellung auf Elektro-Busse auf das deutsche Energiesystem
    (Helmut-Schmidt-Universität / Universität der Bundeswehr Hamburg, Fakultät für Elektrotechnik, Professur für Elektrische Energiesysteme, 2020) ; ; ;
  • Publication
    Metadata only
    Charging schedule for load peak minimization on large-scale electric bus depots
    The city of Hamburg has decided to electrify its bus fleets. The two public transportation companies in this city expect to operate up to 1500 buses by 2030. In order to accomplish this ambitious goal, both companies need to build an appropriate charging infrastructure. They have both decided to implement the centralized depot charging concept. Buses can therefore charge only at the depot and do not have the possibility for opportunity charging at intermediate stations. The load profile of such a bus depot is highly dependent on the charging schedule of buses. Without an intelligent scheduling system, the buses charge on demand as soon as they arrive to the depot. This can lead to an unevenly distributed load profile with high load peaks, which is problematic for the local grid as well as for the equipment dimensioning at the depot. Charging scheduling on large-scale bus depots is a relatively new and poorly researched topic. This paper addresses the issue and proposes two algorithms for charging scheduling on large-scale bus depots with the goal to minimize the peak load. The schedules created with the proposed algorithms were both tested and validated in the Bus Depot Simulator, a cosimulation platform used for bus depot simulations. © 2019 by the authors.
  • Publication
    Open Access
    Konzepte für das Lastmanagement auf großen Busbetriebshöfen
    (Helmut-Schmidt-Universität / Universität der Bundeswehr Hamburg, Fakultät für Elektrotechnik, Professur für Elektrische Energiesysteme, 2019) ; ; ;
    Burkhardt, Jörg
    ;
    Klingenberg, Heinrich