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It seems strange to disconnect generators in order to fix the mismatch problem. Have you tested to lock the reactive power generation instead, i.e. set Qmax=Qmin for the concerned generators instead?
Make sure that the Qmax - Qmin difference is larger than 0.002 pu for all generators with unequal Q-limits. This is 0.2 Mvar for a saved case with 100 MVA system base. Generators with a smaller difference should be locked by setting both Q limits to (Qmax + Qmin)/2. These updates shall be done in the base case, before performing N-1 analysis.
