Include all PV in microgrid by default

[adfarth]

• In this run, you can see that although PV is included in the solution, it is not dispatched during any modeled outage: https://reopt.nrel.gov/tool/results/5bdd8b88-4614-465b-878d-9a00fd98c6b1. This is despite the following constraint, which does get applied correctly:

 if p.s.site.mg_tech_sizes_equal_grid_sizes
        @constraint(m, [t in p.techs.elec],
            m[:dvMGsize][t] == m[:dvSize][t]
        )

• While the constraint above does get correctly applied, the value for binMGTechUsed is 0 in this case. And the result Outage.pv_microgrid_size_kw = dvMGsize * binMGTechUsed, which is why this results is 0.
• It looks like PV is never(??) run simultaneous to a generator?! And, if the generator needs to be used at all in a given modeled outage, then it will be used to cover all of the critical load, if possible.
• See this example in which PV is able to serve all of the load during some of the outages, and thus has a Outages.pv_microgrid_size_kw equal to the PV size: https://reopt.nrel.gov/tool/results/94d0197b-2f1a-4b3b-885c-814ecafc29ce
• In this example, I set the max generator size to something lower than the critical load. REopt chose to add a battery (expected) and in no cases is PV serving the critical load along with the generator (unexpected): https://reopt.nrel.gov/tool/results/54f422c9-d411-41e1-99c9-81020887fd12
• DISCOVERY: PV DOES get used in the outage when the same model is run with Xpress vs. HiGHS. See inputs for this scenario in comments
  • Potential bug, but also confusing as to why different results are obtained with Xpress: It looks like solver_is_compatible_with_indicator_constraints is false with Xpress, but is expected to be true --> made a separate issue for this: p.s.settings.solver_name not getting updated #458

[adfarth]

mg_sizes.json

[adfarth]

Turns out this is because the fuel cost was insignificant enough to the objective function that the model can find a solution within the tolerance before finding the lower fuel cost solution that uses PV instead of the generator during outages.