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 <> wrote:
> Hello,
> 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,
> Chenxi  

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