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Hi Patrick,

I tried it myself and found the same problem as you. I first thought that decreasing Xsorce would solve the problem, but it made it even worse!!!

Then, I increased Xsorce, and the voltage variation became lower. Eventually, I tested with Xsorce = 10000 pu and now the voltage is very stable.

I show a plot of the simulation below:

The blue curve is the generator voltage, and it is stable at 1.03 pu. The green curve is the rotor speed and the red curve is the bus frequency, the are both plotted against the right y-axis.

So, a simple workaround is to increase Xsorce to a very high value.