Check for minimum Tulipa graph criteria

[clizbe]

Here's a list of minimum graph criteria to check:

• At least 2 connected nodes
• At least 1 producer (production >0) & 1 consumer (demand >0)
• For every consumer (with demand >0), there must be at least 1 producer (production >0) OR converter with the same energy type going out
  • Same for producer (with production >0), at least 1 consumer (demand >0) or converter with same energy carrier in
• Do we want to catch unconnected (isolated) nodes? Or allow this for easier scenario building?

This is very basic and I'm sure there's more with specific parameters, so please add your ideas! @datejada @gnawin

[suvayu]

I guess converter & storage can act as both producer & consumer in these rules? Can they be terminal points?

[clizbe]

Kind of... These rules are basically defining a system that produces and consumes the correct energy types, thus at least having the potential to balance. (ignoring capacities)
You need at least 1 producer and 1 consumer - beyond that you can have storage/conversion, but they don't replace the minimum producer & consumer.
You CAN have a producer of energy type A and a consumer of energy type B, IF there's a converter of A->B.

As far as I know, storage and conversion cannot be terminal points. You will always need an outflow to a terminal consumer.

Hydro might be a weird case that bends these rules, by having an inflow that's not a producer... ? @datejada @gnawin

Valid minimal systems:

• H2 producer -> H2 consumer
• H2 producer -> H2 storage -> H2 consumer
• H2 producer -> H2-to-Elec converter -> Elec consumer

Note: I can't remember how we defined Hubs. They might have super powers.

[clizbe]

Hydro might be a weird case that bends these rules, by having an inflow that's not a producer... ? @datejada @gnawin

Or it could be we implement hydro as:
Water producer -> Water-to-Electricity converter -> Elec consumer

But I'm not sure.

[clizbe]

@suvayu Is this issue still relevant?

[suvayu]

Well, it is still required for completeness. And probably useful also in the main model. I don't know what should be the priority.