Fix multiple ward reductions on one network #2282
Open
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Problem
If multiple ward equivalent calculations are done on the same network (e.g. clustering nodes), currently an error appears when a ward equivalent unit should be placed on a bus where already a ward equivalent unit stands.
Fix
The changes inside the code picks only the newly created units.
Open Problems/Assumptions
Assuming the power on the load of the previous added ward element is unequal to zero. Maybe this could be a harsh assumption, maybe there is a better proposal recognizing the previously added ward elements. I could imagine just picking by bus number the last element in the dataframe, but this feels unsafe too.