H2 Electrolysis and Fuel cells and buses are re-added (Same for battery)

[yerbol-akhmetov]

Checklist

• I am using the current main branch or the latest release. Please indicate.
• 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. Here I would like to report potential bug in add_hydrogen function of prepare_sector_networks, In particular, H2 Fuel Cell, H2 Electrolysis and H2 buses are readded, which causes error message as warning. So they effectively are not added, because they are already in the network.

Example, we have H2 electrolysis addition in add_extra_components:

        n.madd(
            "Link",
            h2_buses_i + " Electrolysis",
            bus0=buses_i,
            bus1=h2_buses_i,
            carrier="H2 electrolysis",
            p_nom_extendable=True,
            efficiency=costs.at["electrolysis", "efficiency"],
            capital_cost=costs.at["electrolysis", "capital_cost"],
            marginal_cost=costs.at["electrolysis", "marginal_cost"],
        )

In prepare_sector_network we have:

        n.madd(
            "Link",
            nodes + " H2 Electrolysis",
            bus1=nodes + " H2",
            bus0=nodes,
            p_nom_extendable=True,
            carrier="H2 Electrolysis",
            efficiency=costs.at["electrolysis", "efficiency"],
            capital_cost=costs.at["electrolysis", "fixed"],
            lifetime=costs.at["electrolysis", "lifetime"],
        )

@davide-f

Error Message