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    Item type:Publication, Access status: without files ,
    Load distribution and operating point estimation in inverter-dominated grids by electrical signature analysis
    (IEEE, 2024-09)
    Klie, Christoph
    ;
    Engemann, Tim
    ;
    Becker, Christian
    High-frequency oscillatory excitations are common undesired by-product of inverter-coupled devices in alternating cur-rent (AC) and direct current (DC) grids. This paper introduces a novel concept that utilizes the characteristic spectra, defined as the device’s signature obtained from the oscillatory excitations, to estimate the operating point of devices within an electrical grid. The uniqueness of this concept lies in its ability to approximate operating points for multiple devices with a single measurement point in the grid. This is achieved by calculating the spectral decomposition of the grid measurement and solving an optimization problem for a superposition of known device signatures to minimize the deviation from the spectral grid components. The findings of this study demonstrate that by leveraging the undesired effects of modern power electronics, information about devices in the grid can be obtained that might otherwise be inac-cessible. This is particularly important for grids where additional transducers cannot be used or the grid cannot be altered for measurements, yet detailed knowledge of device operating points are required. The fact that operating points can be estimated through voltage readings as well, opens numerous possibilities for analyzing electrical grids.
    Publicationtype: Conference Paper
      82
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    Item type:Publication, Access status: without files ,
    Impacts of Distribution Grid Congestion Management on Charging Efficiency of Private Electric Vehicles
    (2024-09-16)
    Steffen, Tom
    ;
    Wiegel, Béla
    ;
    Teimourzadeh Baboli, Payam
    ;
    Becker, Christian
    With the increasing spread of battery electric vehicles (BEVs) and heat pumps in the distribution grid, the path towards a climate-neutral energy system is consistently pursued. However, the direct use of renewable energies is placing an increasing burden on the historically evolved electricity grid, which makes congestion management necessary to limit line utilization at times of high energy demand. This paper contributes by examining the negative impacts of the current regulatory congestion management on the charging efficiency of private BEVs and its consequences for the electricity grid. To achieve this, measurements of the charging current of BEVs were used to develop a model that describes their charging behavior under different external conditions and operating points. The results indicate that, on average, BEVs require an additional 3% up to 250 kWh per year more energy due to congestion management, which in all scenarios is significantly more than the reduction of the line losses.
    Publicationtype: Conference Paper
      39