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    Item type:Publication, Access status: without files ,
    State initialization for small-signal stability analysis in converter-dominated power systems using extended load-flow equations
    (IET, 2026-07-14)
    Helmich, Leon M.
    ;
    Zuromski, Christina
    ;
    Bahe, Ben
    ;
    Becker, Christian
    Small-signal stability analysis methods, such as eigenvalue-based or impedance-based approaches, play a major role in the evaluation of system stability in converter-dominated systems. As part of these methods, linearization around an operating point is required. However, especially in larger-scale systems, identifying the operating point is increasingly challenging. In this paper, we present a load-flow-based method for fully initializing system states at the operating point. We extend the load-flow equations for the most relevant types of converters, both grid-following and grid-forming, and present a procedure to determine all system states from the results obtained by load-flow equations. Finally, we show that the load-flow-based approach successfully identifies the operation point of a six bus system with a high share of converters.
    Publicationtype: Conference Paper
      41
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    Item type:Publication, Access status: without files ,
    Implications of the grid location for different operational use cases of dc links in ac distribution systems
    (Institution of Engineering and Technology (IET), 2026-04)
    Engel, Merlin
    ;
    Newe, Hannes
    ;
    Babazadeh, Davood
    ;
    Becker, Christian
    The ongoing energy transition increases the complexity of power system operation and planning, particularly at the distribution system level. Rising electrification and decentralized generation challenge the existing grid infrastructure. Integrating direct current (DC) technology into alternating current (AC) distribution systems offers significant potential to enhance operational flexibility and reduce grid reinforcement needs. This paper contributes to the development of combined methods for the operation and planning of DC links in AC distribution systems by providing a better understanding of the mutual dependence between the choice of operational use cases and grid location. It investigates implications of the grid location for the operational use cases minimisation of active power losses, minimisation of relative branch current loading and minimisation of node voltage deviations. The three use cases are applied to four configurations of a benchmark system. These configurations represent a reference case without a DC link and three different locations for the integration of a single DC link. The results show that the benefit of integrating a DC link into an existing AC distribution system strongly depends on the location of the DC link. Furthermore, the implications of each location also depend on the chosen operational use case.
    Publicationtype: Conference Paper
      29