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
