Is it possible to find the source code for the UPS software?

Question

Uninterruptable power source

Good afternoon dear ones.
Faced such a problem, at the moment of writing the PhD work, there is a task to analyze the program code and the algorithm of its operation (without its implementation) in uninterruptible power systems (UPS / UPS).
The essence of the problem lies in the fact that I can’t find the source code for any UPS for many days, it’s worth clarifying what is needed:
- any UPS (well, of course, it would be even better if it’s on-line)
- any stone
- any programming language ( at least C, at least ACM, at least GO)
If someone has met, I very tearfully ask you to share, maybe it will help out a lot.
ps If I wrote in the wrong section, I apologize and, if possible, move it to the right one ...