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Flat Start Oscillations

Hello all,

I've been working with a dynamic case and just caught that the generators oscillate ever so slightly from "flat start." When I perform the simulation during flat start it seems that everything is fine, but the generators will experience a max 0.000004 P.U. deviation 100MVA base. These oscillations occur on generators that are outputting about 750 MW of power. I'm wondering if these intrinsic differences are due to PSS/e software's failure to capture such a resolution?

Thanks!