Information on both countries for unpaired dangling lines

[ccheylan]

Describe the current behavior

Currently, an unpaired dangling line is associated with a pairing_key and one voltage level id, for which we can identify the substation and the country. However, in the ENTSOE EQ BD xml file, the pairing key is associated with a connectivity node that has a country from and country to. I don't think it is possible to access this information in pypowsybl right now, so we get only one of both country whereas it would be useful to know where the unpaired dangling line is supposed to go.

Describe the expected behavior

It could be useful to get the information on the country from and to for the unpaired dangling lines. For instance, we could have a dataframe with for each pairing key of the dangling lines of the network, the country from and country to associated with it.

Describe the motivation

This feature is needed for the CGMES dataset validation step in METIS 4, to identify for each unpaired dangling lines, whether it is flow that goes outside the merging zone or some mistake of modelisation.

Extra Information

No response