Things To Discuss

[Ethan-Russell]

@sallyrobson I have a couple of things I'd love to discuss at our Thursday meeting. Storing them here to document. No need to look at them until Thursday.

Output Folders

• Right now, in E4ST.jl, the output_path is provided in the config file, and all of the outputs are written to that path. When the config file is loaded, E4ST checks to see if there is anything already in the folder. If it does contain anything, it will move the contents of that folder to another folder named <output_path>_backup_<timestamp>. That sometimes causes some problems, like when the io for the E4ST log or the solver log is still open, or didn't get properly closed/flushed from the memory. This happens quite frequently unless you are very careful to close things
• Another way to do this would be to still specify the same output_path in the config file, but when the config file is loaded, create a new timestamped file folder inside of the original output_path, i.e. <output_path>/yyyymmdd_HHMMSSsss. Then possibly rename config[:output_path] to the newly created path, and make config[:base_output_path] equal to the original.

Results Data Structures

Objective Scaling

we decided to scale it, then scale it right back so that the user only has to do things in dollars. Scaling can happen later on.

Power balance expression

[Ethan-Russell]

Go ahead with the output folder timestamp

[Ethan-Russell]

To talk about with Ray Zimmerman:

• 73

• 72

• Combining of Buses:
  • Is it ok that we are aggregating co-located buses without checking historic or simulated phase angle differences?
  • Would we need to run simulations or use the historic (from Energy Visuals) phase angle differences?
  • What would be a reasonable threshold not to combine?

[Ethan-Russell]

• Ray: If voltage angle differences are large, combining co-located buses could make a big difference
• Ray: Are they also directly connected, i.e. via transformer? There could be flow limits on the transformer that would be eliminated by combining the buses.
• Dan: We could do a test of difference in solution between running with and without combining co-located buses. This testing method could be a way of testing out voltage angle difference threshold as well.
• Ray: simulating to get phase angle differences could be better with wide ranges of scenarios/operating points.
• Ray: we could find equivalent reactances (even if not directly connected) to find equivalent reactance, then threshold on the reactance. Large reactance (small susceptance) will give a small phase angle difference given the same amount of power flow. Could combine buses given that their equivalent reactance is large, above a threshold.