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    Item type:Publication, Access status: without files ,
    Unified graph-theoretic modeling of multi-energy flows in distribution systems
    (IEEE, 2025-10-20)
    Mostafa, Marwan
    ;
    Wenser, Daniel
    ;
    Teimourzadeh Baboli, Payam
    ;
    Becker, Christian
    The increasing complexity of energy systems due to sector coupling and decarbonization calls for unified modeling frameworks that capture the physical and structural interactions between electricity, gas, and heat networks. This paper presents a graph-based modeling approach for multi-energy systems (MES), where each domain is represented as a layer in a multi-layer graph, and coupling technologies are modeled as inter-layer edges via a dedicated coupling layer. A steady-state solver based on a block-structured Newton-Raphson (NR) method is developed to jointly compute flows and state variables across all carriers. The proposed model is tested and validated on a realistic case study based on data from a German distribution network. The results demonstrate convergence, numerical accuracy, and consistent domain interaction, and demonstrate the method’s applicability for system-wide analysis and its potential as a foundation for future optimizations in integrated energy systems.
    Publicationtype: Conference Paper
      71
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    Item type:Publication, Access status: without files ,
    Harmonizing distribution system planning and the operation of integrated DC systems
    (IEEE, 2025-10)
    Engel, Merlin
    ;
    Heise, Johannes
    ;
    Newe, Hannes
    ;
    Babazadeh, Davood
    ;
    Becker, Christian
    The ongoing energy transition leads to a drastic increase in the number of power-generating and -consuming units as well as the accumulated installed power in the German power system. The exploitation of operational flexibility offers the potential to reduce the resulting need for power system reinforcement and expansion. The integration of DC systems into existing AC distribution systems provides operational flexibility with assets that by European legislation can be owned by distribution system operators (DSO). Consequently, the DSO can decide on their operational behavior, numbers, location, power rating, and availability. However, the corresponding planning task requires procedures that involve operational considerations. This paper employs a customized optimal power flow based operational strategy for DC links within a planning study, evaluates mutual implications between planning and operation, and derives necessary adjustments for their harmonization. The representative case study on medium-voltage grid planning demonstrates that the integration of controllable DC links in combination with a suitable operational strategy can significantly reduce the number of reinforcement measures required to resolve overloading of grid assets for increasing power demand compared to non-controllable alternatives.
    Publicationtype: Conference Paper
      31