I notice that you also created a support ticket for this question on firstname.lastname@example.org. I am copying my colleague Min Luo's correspondence to you here --
"In this case the two converters can not determine how the current rotor current of the induction machine is separated.
If the modulation of the two converters are exactly synchronized, you may just use one converter to represent two. If not, there is usually extra filter inductors connected to the output of the two converters, in this case please remember to replace the original machine model with “Induction Machine (Slip Ring, Saturable)” and change the “Configuration” parameter to “VBR full”."