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In a normal solution (FNSL, ACCC, etc.) the swing bus takes up the MW mismatch. Normally you have only one swing, so the whole MW error will be compensated by one plant.

Solving with inertial/governor dispatch (INLF) means that the power taken up by the swing will be redistributed to all generators according the their MVA size (MBASE). This will of course lead to a different load flow in the network.

Solving with INLF (Governor response) is a way to study the effect of primary frequency control without performing a dynamic simulation.