The body of this silly paper found observationally lower grid frequency variations in larger ‘isolated’ European subgrids! Of course larger grids have less frequency variation— something trivially true and known for many decades. The reasons are intuitive and simple. Larger grids by definition have more generation feeding the grid, so more grid inertia, and at the same time less ‘instantaneous load variation’ by simple virtue of the statistical law of large numbers.
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