This code was contributed by Yujia Zhu when he was at ASU working with Dan
Tylavsky. I’m afraid I’m not familiar with the details of that code, but I’m
pretty sure it was double-checked extensively against PSS/E’s internal models.
Ray
> On Aug 6, 2018, at 4:50 AM, Aebi Stefanie <[email protected]> wrote:
>
> Dear all
>
> I am trying to convert a PSSE .raw network case to mpc format.
>
> I just discovered that I obtain negative branch parameters for some of the
> 3-winding transformers in my System, i.e. x < 0, r < 0. I tried to track the
> phenomenon and found the following section in psse_convert_xfmr.m:
>
> R1 = (R12+R31-R23) ./ 2;
> R2 = (R12+R23-R31) ./ 2;
> R3 = (R31+R23-R12) ./ 2;
> X1 = (X12+X31-X23) ./ 2;
> X2 = (X12+X23-X31) ./ 2;
> X3 = (X31+X23-X12) ./ 2;
>
> I've got a number of branches where the negative term (e.g. R23 in
> calculation of R1) is the biggest one, such that the resulting R or X is
> negative.
>
> Where does this definition come from?
> And is there a way I can avoid getting negative line parameters?
>
> Thanks for your help.
>
> Kind regards,
> Stefanie Aebi
