Setting constraints for the total possible nominal value over all periods in a multi period model in Oemof.Solph:

Q&A
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1

Hello,

I have been trying to set up a multi period investment model in oemof.solph. I want to model a district heating system with both power to heat and CCGT as Thermal sources. Currently I am struggling with limiting the overal nominal value of my pth component over multiple periods. Assuming that I only have the space for 50 MW, I want the model to consider this as an overall constraint.

    energysystem.add(
        Converter(
            label="pth",
            inputs={bel: Flow()},
            outputs={
                bth: Flow(
                    nominal_value=solph.Investment(
                        maximum=10e3,
                        existing=5e3,
                        ep_costs=500,
                        lifetime=30,
                        age=28,
                        interest_rate=0.02,
                    ),
                    variable_costs=0.1,
                )
            },
            conversion_factors={bel: 0.99},
        )
    )

I know that I can limit the number of additional capacity/nominal_value per period using maximum=10e3. However, how do I include the constraint of 50e3/50MW total capacity installed over all periods?
I tried using the following code based on this link with no success:

    flow_with_keyword = {('pth', 'bth'), flow}
    model = solph.constraints.generic_integral_limit(
    model, "nominal_value", flow_with_keyword, limit=50e3)

Since I could not find anything online I wanted to ask here in the forum. Thanks in advance.

Michel