Method of energyPRO OPTIMIZE
Annuity
The sizing optimization in energyPRO is done by adding independent variables for the capacities of the selected elements. A linear cost is multiplied with these independent variables.
The linear cost is calculated as an annuity of the investment based on the interest rate and expected lifetime.
Where \(i\) is interest rate and \(n\) is expected lifetime.
Upper value
The upper value of the energy type is used to limit the interval in which the optimal capacity is looked for. The full load capacity of the energy conversion unit is used to define the relationship between the energy types of the energy conversion unit.
Optimization period
The optimization period is set to year regardless of the setting in the projects.
Part load and minimum load
Since the full load capacity of the energy conversion unit is an independent variable, it is not possible to have part load power curves and minimum load.
Limitations
The size optimization only works with the MILP solver.
The energy conversion unit is allowed to part load down to zero with the efficiencies of the full load power curve. Any part load power curves will be ignored including minimum load.
The planning period is one year even if you have more years in the project’s planning period. The optimization period is also a year, even if you have monthly optimization in the project settings.
It is not possible to optimize fuel storages, user defined thermal storages or hydro station storage.