Hello to everyone!I want to make a reliability analysis to the ieee24 buses 
system.In order to calculate the energy not served i will put extra generators 
, which are more expensive ,to serve the loads  and will work only in case the 
other generators have failed.Before doing that, I put the extra generators, one 
in each PV bus. The extra generators have a bigger capacity than the U197 and 
modified cost data, which were made just increasing the values of the 
coefficients and the starting cost of U197. So, at first, I ran an opf without 
any generator failing and the problem did not converged and it says' 
numerically failed'.What am I doing wrong?Is it wrong to modify arbitrarily the 
cost data to create new ones?Also, how can I make this generators work only if 
the rest of the others don't satisfy the load and not always?Thank you in 
advance,Angelina                                       

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