The power flow problem solved by runpf does not take into account voltage
limits. If you need to enforce limits, you can use an appropriately constrained
OPF.
In this case, it just so happens that the initial voltage specified for bus 31
in the case57.m file happens to be the voltage at the power flow solution.
Ray
> On Feb 8, 2019, at 2:54 PM, Mohamed Shaheen <mohamed.shaheen9...@gmail.com>
> wrote:
>
> Dear Sir,
>
> Regarding the case57, the voltage of bus 31 is 0.936 p.u which is less than
> the min. limit of bus voltage (0.94). Every time I run 'runpf', the voltage
> value is 0.936 and it doesn't change although it is a PQ bus.
> I need your help, please.
>
> Regards,
> Mohamed Shaheen.
>
> Msc. student at Ain Shams University in Egypt
> Teaching Assistant in Future University in Egypt
> ᐧ
