MV grid max. distance outliers

[nesnoj]

We have different grids with quite long total length from HV-MV subst. to farthest MV-LV subst. (ring(s) are open) with a max. of ~84km (MVGD 3093). We might add an additional constraint on max. half-ring length in tech_constraints_satisfied().
To evaluate the need, a histogram of max. distances should be created first (see #189).

[nesnoj]

This example was caused by the circ. breaker relocation using loads as well as generators.
From 1046681 (see also #167) on the standard value is loads only, so this MVGD should be ok now.
@gplssm Please create a new grid dataset as soon as I give you a go (I wanna fix sth else first)

[gplssm]

Yep, I'll do that. I did a new run on the weekend and it took only 24 hrs...

[nesnoj]

🆗, this one is done too. U can go for it

[nesnoj]

Update - what I did:
I added an additional constraint for the max. ring length of 2 * v_level * max_ring_length_factor (e.g. in a 20kV grid assuming max_ring_length_factor=1.5 (default in config_calc) the max ring length would be 60km) . max_ring_length_factor is used to achieve more variance in the grids.

@jochenbuehler Is a factor of 1.5 reasonable?

[jochenbuehler]

Seems so:

[nesnoj]

See #224 for new implementation