In general the simulation will force resource dispatch segments to be monotonically increasing in cost (not considering the minimum capacity). When Commitment Optimization is used, though, in some circumstances the simulation will allow the dispatch segments to be out of order and add constraints to ensure that the dispatch still happens in the proper order. This is allowed only when doing a zonal, hourly simulations (i.e., not allowed in Nodal or Sub-Hourly studies). When using commitment optimization for a zonal, hourly study, there are two commitment solve representations:
System: by default the simulation will allow the out of order costs, but if this column is explicitly set to False the simulation will not allow the out of order costs and will validate/adjust the data as needed.
Region: in most cases the simulation will not allow the out of order costs to improve run time, but if this column is explicitly set to True or if ramp rates are being used the simulation will allow the out of order costs.
Allow Out Of Order Costs Column
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