fix unbalanced powerflow with out of service ext grids

[jkupka]

Solves a mismatch of arrays during zero impedance addition of ext grids if at least one ext grid is out of service

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.66%. Comparing base (f2794c6) to head (4613282).
Report is 106 commits behind head on develop.

❗ Current head 4613282 differs from pull request most recent head 14c156e

Please upload reports for the commit 14c156e to get more accurate results.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #2227       +/-   ##
============================================
+ Coverage    62.30%   79.66%   +17.36%     
============================================
  Files          255      255               
  Lines        28062    27840      -222     
============================================
+ Hits         17483    22178     +4695     
+ Misses       10579     5662     -4917     

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[rbolgaryn]

This one was merged: fix unbalanced powerflow with out ouf service ext grids #2184

Is this PR still relevant?

[vogt31337]

@jkupka @dlohmeier still relevant?

[jkupka]

yes, it's still relevant as it solves a different issue than #2184

[rbolgaryn]

please address the comment from Daniel and add information to CHANGELOG.
Please also write a test that fails with the current pandapower and passes because with this pull request.

[rbolgaryn]

@jkupka please address the change request

[SteffenMeinecke]

for some reason, I cannot push to this branch with opened PR or open a PR to that branch, but I can confirm that the conflicts are regarding the changelog only.

[jkupka]

The merge conflict was resolved. Failing tests seem to have nothing to do with the changes in this pull request

[SteffenMeinecke]

The merge conflict was resolved. Failing tests seem to have nothing to do with the changes in this pull request

For some reason, I still cannot merge. Maybe git rebase is needed or something else. I don't know. Alternatively, I open another PR with the same fix.

[dlohmeier]

@rbolgaryn can you approve? Seems like it is not possible to merge without your approval.

is fixed now