Do you have a small (the smaller the better) example that exhibits this
problem? It’s possible that convergence requires automatically updating the
settings of other controls (like other transformer taps or something).
> On Aug 9, 2017, at 7:06 PM, Chenxi Lin <chenxi...@gmail.com> wrote:
> I wonder why non-zero phase angle in transformers connecting PQ buses usually
> cause power flow not converge. However, if the transformer is connected to a
> PV bus then PF is converged. For the same case, PSS/E or PowerWorld do not
> have this issue.
> Thanks in advance,