Fix h2 deriv import limit (#119)

* rename and changelog

* fix double counting of methnaol

* strengthen import limit for h2 derivatives

* Update changelog for H2 derivative import limit

Author: Micha

CHANGELOG.md

@@ -1,4 +1,5 @@
 # Changelog
+- Bugfix: Enforce stricter H2 derivative import limit to avoid that exports of one type of derivative compensate for imports of another
 - Added an option to source mobility demand from UBA MWMS (Projektionsbericht 2025) for the years 2025-2035
 - Renamed functions and script for exogenous mobility demand
 - Improved the transport demand data, added an option to source 2020 and 2025 data from AGEB instead of Aladin

config/config.de.yaml

@@ -4,7 +4,7 @@
 
 # docs in https://pypsa-eur.readthedocs.io/en/latest/configuration.html#run
 run:
-  prefix: 20250807_merge_july
+  prefix: 20250901_h2_deriv_fix
   name:
   # - ExPol
   - KN2045_Mix

scripts/pypsa-de/additional_functionality.py

@@ -652,10 +652,16 @@ def add_h2_derivate_limit(n, investment_year, limits_volume_max):
         ].index
 
         carrier_idx_dict = {
+            # Every carrier should respect the limit individually
             "renewable_oil": 0,
             "methanol": 1,
             "renewable_gas": 2,
-            "H2_derivate": [0, 1, 2],
+            # Exports of one carrier should not compensate for imports of another carrier
+            "H2_derivate_oil_meoh": [0, 1],
+            "H2_derivate_oil_gas": [0, 2],
+            "H2_derivate_meoh_gas": [1, 2],
+            # The sum of all carriers should respect the limit
+            "H2_derivate_oil_meoh_gas": [0, 1, 2],
         }
         for carrier, idx in carrier_idx_dict.items():
             cname = f"{carrier}_import_limit-{ct}"

scripts/pypsa-de/export_ariadne_variables.py

@@ -4619,7 +4619,7 @@ def get_export_import_links(n, region, carriers):
         )
 
     exports_oil_renew, imports_oil_renew = get_export_import_links(
-        n, region, ["renewable oil", "methanol"]
+        n, region, ["renewable oil"]
     )
 
     var["Trade|Secondary Energy|Liquids|Biomass|Volume"] = (