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[upstream candidate] Guard v_nom voltage floor on line-less (Zonal) networks #5

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[upstream candidate] Guard v_nom voltage floor on line-less (Zonal) networks #5

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4 changes: 3 additions & 1 deletion scripts/solve/solve_network.py
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Original file line number Diff line number Diff line change
Expand Up @@ -439,7 +439,9 @@ def apply_line_rating_overrides(network, scenario_config, logger):

# ── 1. Voltage floor ─────────────────────────────────────────────────────
min_v = float(transmission.get('min_bm_constraint_voltage_kv', 0))
if min_v > 0:
# Skip when the network has no lines (e.g. the Zonal network models inter-zone
# links and carries no lines / no 'v_nom' column) — indexing it would KeyError.
if min_v > 0 and not network.lines.empty and 'v_nom' in network.lines.columns:
# Only applies to lines — transformers span two voltage levels so v_nom
# is ambiguous, and transformer constraints are not the source of loop-flow
# artefacts in the Highland 132 kV network.
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