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As answered above, swing bus generation becomes negative if the generation from type 2 buses is greater than the total load plus losses of the network. The swing bus adjusts for the generation-demand balance in the network. This is the mathematical function of the swing/slack generation in terms of load flow calculation.
What's the physical meaning if the swing bus generation becomes negative? The dispatch of the generators is made in an unrealistic way. You have to remember that a swing generator is also a real machine and it has Pmax/Pmin and Qmax/Qmin limits.
