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Hello I'm solving an N-1 contingency case. When a line is open, the voltage on some busbars is exceeding 1.9 pu of its nominal value which is not logic in reality. In the case of opening this line, the swing bus is giving MW above its limit. I tried to make a scaling for the generation however the problem still exists. What may be the reason of this and how I can solve this issue?

Thanks a lot