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Delete capital costs at battery discharge link (#240)

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Hey guys,
please correct me if I'm wrong, but I think pricing both the charge and discharge of the battery store component with the inverter's capital costs results in duplicating costs since a bi-directional inverter is considered (I checked the source of the cost assumption, Budischak 2013). 
Before working with PyPSA-EUR, I have worked with the toy model WHOBS where only the charging-link of the battery store component is priced with its capital costs (cf. https://github.com/PyPSA/WHOBS/blob/master/run_single_simulation.ipynb). The proposed change in code is equivalent.
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Chiara Anselmetti 2021-05-06 15:56:49 +02:00 committed by GitHub
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scripts/add_extra_components.py
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@ -152,7 +152,6 @@ def attach_stores(n, costs):
bus1=buses_i,
carrier='battery discharger',
efficiency=costs.at['battery inverter','efficiency'],
capital_cost=costs.at['battery inverter', 'capital_cost'],
p_nom_extendable=True,
marginal_cost=costs.at["battery inverter", "marginal_cost"])