Dear Matpowers,
Hope you are doing great. We are trying to run PF for a distribution network in
Matpower. Since the R/X ratio is acceptable we tried NR. It did converge,
however, the loss is not correct.
The loss formulae used in MATPOWER are given in section 9.2.4 of the manual
http://www.pserc.cornell.edu/matpower/manual.pdf. I would also suggest to take
a look at the branch models used in MATPOWER in Section 3.2. My guess is either
you are using different branch models or using a different formula for
calculating the losses.
We think we have a difficulty on how to include substation into the code. We
modeled it as a huge generator but it did not work. Since Matpower has been
designed for transmission systems and there is no substation in the original
model we were wondering if you could give us some hints with regard to the way
we may consider the first bus as substation.
It really depends on how detailed you want to make the substation model. The
simplest model for substation would be using a generator at the first bus and
specify it as a swing bus. Another approximate model is to use a transformer in
series with the swing generator.
Shri
Best regards,
Haneen Aburub
