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    Item type:Publication, Access status: without files ,
    Converter-driven small signal stability and interaction analysis for grid-following converters in weak and strong grids
    (VDE Verlag, 2024-06-19)
    Eckel, Christina
    ;
    Becker, Christian
    ;
    Kamma, Jana Celine
    Increased penetration of converter interfaced generation influences the overall power system dynamics and therefore requires new stability analysis. To this end, we present a small signal stability and interaction analysis in the sense of converter-driven stability for grid-following (GFL) converters. Since interaction can occur between control loops of several converters as well as between the control loops and passive grid elements, we use a 2-bus system containing two GFL converters, two loads, a line, and a Thévenin equivalent. Modular state space component models allow the implementation of the linearized state space model of the whole considered power system that we further use for the small signal stability and interaction analysis via eigenvalue, participation factor, and indices analysis. We furthermore outline the influence of the grid strength on interactions and show that in the case of a weak grid, which can be equated with a high proportion of converter interfaced generation, interactions and the risk of instabilities may increase. EMT simulations for validation purposes as well as the analyses are performed in Matlab Simulink.
    Publicationtype: Conference Paper
      102
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    Item type:Publication, Access status: without files ,
    Converter-driven small signal stability and interaction analysis for grid-following converters using emt and phasor simulations
    (2023-09)
    Eckel, Christina
    ;
    Kamma, Jana Celine
    ;
    Becker, Christian
    The increasing amount of power electronics, due to the fast dynamics, results in a change in the overall power system dynamics. Thus, stability analysis is required to analyze the converter induced interaction phenomena that can be attributed to converter-driven stability. A prerequisite for stability and interaction studies is the selection of an appropriate model that can represent electromechanical phenomena and electromagnetic transients (EMT) effects. A compromise between accuracy and computation time is required. Therefore, this paper compares the results of small signal stability analyses using converter EMT, detailed and a high level phasor models. The performed eigenvalue, participation factor, and indices analyses show, that interactions between the converters themselves, and between converters and the grid can be best represented using EMT models. We outline a risk of instability for the interactions induced by the phase-locked loop, and the voltage delay. The delay induced interactions can be represented using the detailed phasor model of the converter, while those between the converters can only be represented partially. Even though faster computing time is possible with the high level phasor model, interactions between the converters and the grid cannot be represented.
    Publicationtype: Conference Paper
      48