simple_modified 2.zip
The attached model fails with Could not find optimal result: Infeasible during investment appraisal.
I believe this is due to the presence of lower availability constraints, meaning that the asset cannot supply the remaining demands without exceeding them. The capacity constraint is set up to bound supply to less than or equal to demand (the idea being that it should max out demand as much as it can, so long as it has positive activity coefficients), but with lower availability constraints it's possible that this constraint cannot be met, making the problem infeasible. Three possible solutions:
- we exclude this investment option and allow the simulation to continue (possibly raising a warning)
- we relax (possibly remove entirely) the supply constraint, allowing this asset to be appraised. The appraisal metric would then have to take into account how much of the supplied commodity is actually demanded, which would penalise any wasteful assets
- find a way to calculate the max capacity that avoids having to oversupply, and cap capacities based on this. We already cap capacities based on current DLC and investment limits, so it would just be an additional cap, or a modification to the DLC calculation
simple_modified 2.zip
The attached model fails with
Could not find optimal result: Infeasibleduring investment appraisal.I believe this is due to the presence of lower availability constraints, meaning that the asset cannot supply the remaining demands without exceeding them. The capacity constraint is set up to bound supply to less than or equal to demand (the idea being that it should max out demand as much as it can, so long as it has positive activity coefficients), but with lower availability constraints it's possible that this constraint cannot be met, making the problem infeasible. Three possible solutions: