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Sorry to barge in but I have also experienced the same effect, only that it is when I use an user defined model similar to the PLBVFU.

I am manipulating the frequency at the POI and I leave the voltage singal unmodified and I see a similar effect, the voltage drops in proportion to the frequency.

If you don't mind me asking, what would be the physical explanation (if any) for this effect? and why does increasing the reactance of the generator at the swing bus appears to help?

Thanks!

Jorge