Remove large numbers as no-limit pattern from unserved energy and transmission limits - #1397
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eranschweitzer wants to merge 3 commits into
Open
Remove large numbers as no-limit pattern from unserved energy and transmission limits#1397eranschweitzer wants to merge 3 commits into
eranschweitzer wants to merge 3 commits into
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Makes it possible for a transmission line to have no lower or upper limit. In these cases, the constraints are skipped for that line and period. This is useful for modeling lines where the flow capacity is known to not be a limiting factor. An example may be an radial connection where congestion in or out is not expected to occur. This is also useful for using the simultaneous flow constraints to model PTDFs by splitting up zones into multiple sub-zones with unlimited radial connection to the "main" zone.
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At present all transmission lines require a limit to their capacity. However, it is possible that a transmission line is needed due to the zonal balance constraint but we know ahead of time that it should never be binding.
The currently solution is to set the capacity to be some large number, however, that has the implication of artificially inflating the right-hand-side range of the optimization, which can lead to numerical issues in the solution.
This MR makes it possible to leave out either the min and max of the transmission capacity and the constraint is then fixed.
This is the same pattern that is used for the timepoint specific transmission flow constraint.
A similar thing is done for the unserved energy limit (if it is left out the constraint is skipped), for similar numerical reasons.