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Demonstration of the NEMO Tool Suite’s Applicability

The NEMO tool suite was applied and validated by three use cases in order to assess particularly important issues of integrating EVs into electricity networks.

If you are interested in receiving the complete use case results for free please contact Bernhard Wille-Haussmann (bernhard.wille-haussmann@ise.fraunhofer.de), Anders Andersen (ana@emd.dk) or Martijn Huibers, (Martijn.Huibers@dnvgl.com).

    Use Case "Matching DG and EV"

    The first use case analysed the interplay between fluctuating distributed renewable generation, heat pumps and EV within two municipality distribution grids in the community of Ringkøbing in Denmark. The investigation focused on electricity grids which were provided by the project partner and local DSO RAH. Within the two low voltage networks DSM approaches significantly reduced grid extension needs resulting from voltage violation scenarios.

    The pictures illustrate the voltages in one of the community grids before and after applying DSM:

    Voltages OSM use case 1 a

    Use Case "Fast Charging Spots"

    Within the “Fast Charging” use case one example was to use the NEMO tool suite with a special focus on Germany. The reason is the introduction of the ordinance for load management of interruptible loads such as EV within low voltage grids through the mechanisms of section 14a of the German Energy Act. Therefore, the project team investigated the extent to which voltage control strategies decrease critical voltage levels in suburban low voltage grids compared to uncontrolled fast charging. One major result was that combined active power limitation and reactive power reduce the volume and frequency of power limitation and therefore the need for grid reinforcement.

    The picture shows the number of power limitations per year for all sub-scenarios differentiated per height of the power limitation in relation to the maximal charging power of the scenario, Pmax when performing combined active power limitation and reactive power control.

    Balken DSM use case 2

      Use Case "Abnormal Charging Situations"

      Abnormal charging situations are characterized by irregular load requirements which occur only during limited time intervals that lead to singular charging requirements where the requested load profiles are untypical for EV prohibiting application of common grid design tools and methodologies. Characteristics are strongly varying load profiles with only limited long-term predictability. The NEMO tool suite was applied for three different show cases in order to derive implications for manuals for abnormal charging situations: a rail station car sharing place, a football stadium and a remote festival area. One exemplary result was that if significant EV charging situations occur only once or twice a year, investments into temporary storage solutions are a cost-efficient option (e.g. festival).

      The pictures illustrate the minimal nodal voltage with charging power of 11 kW in the car sharing use case visualized by carpet plots (with and without DSM):

        Carpet Plots DSM use case 3 a

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