If you convert everything into per-unit correctly, using a different voltage
base for the different buses, it shouldn’t be a problem. I suggest finding a
good textbook on converting parameters to per-unit to make sure you get it
right, especially for the transformer.
Ray
> On Nov 7, 2022, at 12:56 PM, Irfan Mujawar <irfanbudhg...@gmail.com> wrote:
>
> I want to use the MATPOWER for load flow analysis of the practical radial
> distribution system.
> In the system two voltage levels are there.
> First is 11 kV bus (Bus 1) which is slack bus.
> All other buses are of 440V bus.
> There is a transformer of 11kV/440V between bus 1 and 2.
> From bus 2 onwards are load bus.
> At some buses load is present at some buses no load is present.
> I know the values of R and X of line in ohm.
> How to perform the load flow analysis of this system having two voltage
> levels with transformer?
> How to proceed.
>
> I am able to perform the load flow analysis of the system from 440V and
> downstream buses i.e. with one voltage level.
> I am facing the problem when I make bus 1 as slack bus with 11 kV.
>
> When I have added the 11 kV line and performed the load flow total losses are
> less than that of load flow when only 440V line and downstream loads are
> present.
>
> I am not getting what is wrong.
> Please help.
> Thank you.
