Ken Kundert
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How loose did you set the tolerances?
Are you sure the solution you desire is really periodic? You can try a long transient while strobing at the fundamental frequency. If the solution is really periodic, the strobed waveforms will become constant. If that happens, then the solution is to simply lengthen tstab as mobil suggests. If they don't become constant then the solution you desire is not periodic, perhaps because of some parasitic oscillation, and PSS will never converge to it.
-Ken
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