Mismatch between length of bus0 and bus1 while adding SMR and other technologies in `prepare_sector_network.py`

[yerbol-akhmetov]

Checklist

• [x] I am using the current main branch or the latest release. Please indicate.
• [x] I am running on an up-to-date pypsa-earth environment. Update via conda env update -f envs/environment.yaml.

Describe the Bug

Good day. The issue is related to addition of SMR into the network in prepare_sector_network.py script in h2_hc_conversions function. When adding SMR of SMR CC, the error of mismatch between bus1 and bus0. In particular, nodes are used for bus1 and spatial.gas.nodes are used for bus0. It causes error, as nodes consider only AC nodes, while spatial.gas.nodes considers both AC and DC nodes. So error is related to this piece of code:

            n.madd(
                "Link",
                spatial.nodes,
                suffix=" SMR CC",
                bus0=spatial.gas.nodes,
                bus1=nodes + " H2",
                bus2="co2 atmosphere",
                bus3=spatial.co2.nodes,
                p_nom_extendable=True,
                carrier="SMR CC",
                efficiency=costs.at["SMR CC", "efficiency"],
                efficiency2=costs.at["gas", "CO2 intensity"]
                * (1 - options["cc_fraction"]),
                efficiency3=costs.at["gas", "CO2 intensity"] * options["cc_fraction"],
                capital_cost=costs.at["SMR CC", "fixed"],
                lifetime=costs.at["SMR CC", "lifetime"],
            )

Error Message

The fix will be presented in this PR @hazemakhalek

[hazemakhalek]

Thanks for pointing this out. So far we only worked with force_AC turned on. A good permanent solution here will be great. It has to accommodate for the Force_AC case as well @yerbol-akhmetov