Pypower simulation with large scaled data

[Torahiko Osaki]

Dear Sir or Madam,

I am writing this e-mail to ask the scale of data of busbar and branch and so on to execute the power flow simulation.

I am using pypower version 5.0.0 and have imported following functions from pypower api: case9, ppoption, runpf and printpf. 

The number of  Busbars, Generators and Branches data are over 500 .

After running the simulation, it results 'nan' in almost all fields, where power injectin and losses are expected. 

It also says "RuntimeWarning: overflow encountered in long_scalar (sum(gen[ong, PG]), sum(gen[ong, QG])"

As I have tried same simulation with reduced number of data around 50 Busbars and so on, it made correct results. Therefore, I thought there is an upper restriction of numbers of components to carry out the simulation.

Do you mind to give me some advaice about this issue.

I am looking forward to hearing from you.

Best regards

Torahiko Osaki