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Optimization : Optimization Objects and Methods : Storage Reservoir : Energy in Storage
Energy in Storage
In Optimization, currently None and EIS Table Lookup are supported.
* None
No Energy in storage is considered.
* EIS Table Lookup
With this method selected, Energy in Storage is considered as a function of Pool Elevation.
If the optimization problem uses Energy In Storage, either directly or indirectly, then this slot is added to the problem. Before being passed to the optimization solver, this slot is numerically approximated as a function of Pool Elevation (Numerical 2-D Approximation).
The relationship between Pool Elevation and Energy In Storage will come from the user-input Energy In Storage Table. The table will be queried, either using user-input points defined in the Energy In Storage LP Param table, or using automatically calculated points, depending on method selection in the Pool Elevation Linearization Automation category.
• If the selected method in the Pool Elevation Linearization Automation is None, the user input Energy In Storage LP Param table values are used.
• For other Pool Elevation Linearization Automation methods (Initial Target Input, Min Difference or Range Input, Min Difference), the same points automatically developed for the Pool Elevation linearization are used.
See EIS Table Lookup in Objects and Methods for details on the Simulation method.
Slots Specific to This Method
 Energy In Storage
Type: Series Slot
Units: Energy vs Power
Description: Energy in Storage in the reservoir
Information:  
Defined by: Numerical 2-D Approximation in terms of Pool Elevation, based upon the Energy In Storage Table. The Energy In Storage LP Param table values are used as approximation points indexing the Energy In Storage Table. The Energy In Storage Table should have increasing values of Pool Elevation and Energy In Storage. Energy In Storage is required to be a convex function of Pool Elevation. The preferred order of approximation is substitution, piece-wise, tangent, two-point line.
 Energy in Storage LP Param
Type: Table Slot
Units: Length
Description: Specifies the Pool Elevation points used to take the tangent, line and piecewise approximations for Energy In Storage linearization.
Information: This table is used for linearization unless the Pool Elevation Linearization Automation category has a method selected other than None.
Defined by: User input
 Energy in Storage Table
Type: Table Slot
Units: Length vs Energy
Description: Table defining the relationship between Energy In Storage and Pool Elevation
Information:  
Defined by: User input
Energy in storage pool elevation relationship. Not drawn to scale.
Revised: 07/05/2022