Distribute losses evenly when calculating the net position for paired dangling lines

[caioluke]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce?

Feature

What is the current behavior?

Losses for paired dangling lines are not split equally in net position calculation. As a consequence, the sum of all net positions of a closed network is not 0.

What is the new behavior (if this is a feature change)?
Paired dangling lines (tie lines) are treated like normal lines in net position calculation.

Does this PR introduce a breaking change or deprecate an API?

• Yes
• No

[OpenSuze]

Thank you for your PR !

Could you rename it to "Distribute losses evenly when calculating the net position for paired dangling lines" please ?

Thank you

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[OpenSuze]

I took a bit of time to reconsider this PR.
I think that we had a miss-understanding about losses and leaving flow contributions to net positions.

After thinking about this, we do not think that this is a good idea to distribute the tie-line flow evenly without considering their dangling lines properties.
For example, we do not think this is fair to distribute the flow evenly for an interconnection composed of a section line of 15km in a first country and another section of 5km in another country.
We believe it might be better to keep the current behavior.

I do not want to delete your work.

We will work on another idea based on danglingLine.getBoundary()

[OpenSuze]

We might have found some issues with the power on each side of a boundary. I'm trying to fix this, but it might take a while powsybl/powsybl-core#3165

[OpenSuze]

Hi @caioluke,
I made another PR based on your commit: #164
Could you review it please ?

[caioluke]

Sure thing.

I will close this one, then.

What I wanted to achieve with this PR was precisely the sum of net positions in a closed network being 0.
I thought it was a loss issue but it turned out to be a boundary issue.

Thanks for the help, Hugo!