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As perolofl mentioned these problems are often caused by overloaded Pgen or Qgen. Probably the Pmax/Pmin or Qmax/Qmin in your powerflow data doesn't match with the Pmax/Pmin or Qmax/Qmin in your dynamic models.
My suggestions for what to check:
Check the J+4 and J+5 CONS in your SEXS model against the field voltage initial conditions for machine '1' at bus 84580. Try making Qgen of the machine closer to zero.
Check the J+6 and J+7 CONS in your IEEEG1 model against the Pmax and Pmin in powerflow model for machine '1' at bus 81213. Try reducing the Pgen of the machine.
Check the J+7, J+8, J+9, and J+10 CONS in your WT3E1 model against the Pmax, Pmin, Qmax, and Qmin of machine '1' at bus 84620. Try reducing Pgen of the machine and making Qgen of the machine closer to zero.
