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I am doing a big system simulation, and I am interest in the system frequency response while a generator is tripped. My problem is that once I diconnect the machine, the system is not converged. This is my system's gen/load distribution, and the total disconncet MW is 1271MW at area North.

Area　 North　　Middle　　South

Load　15099.7　11600.7　12566.5　MW

Gen　10812.8　13498.9　14583.9　MW

I think it may be because the power generation in the north is too small, or the governor response is not enough to support the generation loss. Can anyone gives me a possible answer that I can solve this problem? Thanks.