Ken Kundert
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The first two warnings are generally nothing to worry about; they would not affect convergence of PSS.
The third is probably more an indication that PSS is having trouble converging rather than the cause of the trouble.
For PSS to converge, your circuit must have a periodic solution. If you are confident that it does, then it is generally a matter of setting tstab large enough. If you have set tstab so large that all the signals have reached their periodic steady-state behavior, and PSS still does not converge, then there is some other problem.
-Ken
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