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This results in unavoidable algebraic loops at the terminals of the simplified models of active devices, which are solved by integrating their Thevenin equivalent circuits into the Newton-Raphson based power flow calculation method, which is solved in every time step of the dynamic simulation. The assumptions mentioned above lead to a\u00a0significantly lower model complexity and thus to a\u00a0considerably lower parametrization effort in large-scale system studies. Furthermore, they enable higher simulation time steps as well as lower computational time and effort. In order to showcase the impact of the underlying simplifications, both methods are programmed in MATLAB and compared with focus on their frequency behavior in the event of a\u00a0frequency drop. It is shown that the quantities analyzed in the case studies in both simulation approaches (i.e., the center of inertia frequency, terminal active powers, voltages and rotational speeds) exhibit negligible deviations within the very fast transients and especially after they have subsided. This confirms that the simplifications associated with neglecting small electrical time constants are valid for the investigated frequency event.<\/jats:p>","DOI":"10.1007\/s00502-026-01415-8","type":"journal-article","created":{"date-parts":[[2026,3,4]],"date-time":"2026-03-04T11:16:06Z","timestamp":1772622966000},"page":"231-249","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["An efficient simulation approach for long-term stability assessment of electric power systems","Ein effizienter Simulationsansatz zur Bewertung der Langzeitstabilit\u00e4t elektrischer Energiesysteme"],"prefix":"10.1007","volume":"143","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1305-2814","authenticated-orcid":false,"given":"Farshid","family":"Goudarzi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Arne","family":"Pawellek","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lutz","family":"Hofmann","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2026,3,4]]},"reference":[{"key":"1415_CR1","doi-asserted-by":"publisher","DOI":"10.1109\/EPEC.2016.7771694","author":"D Mende","year":"2016","unstructured":"Mende\u00a0D, Hennig\u00a0T, Akbulut\u00a0A, Becker\u00a0H, Hofmann\u00a0L (2016) Dynamic frequency support with DFIG wind turbines \u2014 A\u00a0system study. 2016 IEEE Electrical Power and Energy Conference (EPEC). https:\/\/doi.org\/10.1109\/EPEC.2016.7771694","journal-title":"2016 IEEE Electrical Power and Energy Conference (EPEC)"},{"key":"1415_CR2","doi-asserted-by":"publisher","first-page":"130957","DOI":"10.1109\/ACCESS.2019.2940648","volume":"7","author":"E Rakhshani","year":"2019","unstructured":"Rakhshani\u00a0E, Gusain\u00a0D, Sewdien\u00a0V, Rueda Torres\u00a0JL, Van Der Meijden\u00a0MAMM (2019) A Key Performance Indicator to Assess the Frequency Stability of Wind Generation Dominated Power System. 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