The Plexos description of the LT Plan model formulation is below. LT Plan Formulation The capacity expansion problem is formulated in PLEXOS as a Mixed-Integer Linear Program (MILP or MIP for short). To illustrate the very core of this formulation, we develop the following simplified formulation. NOTE: The following description is illustrative only, and shows only the core of the LT Plan MIP formulation. Definitions Let us define the following variables: Variable Description Type Number of generating units built in year Generator integer GenBuildgy yfor g Number of generating units retired in year Generator integer GenRetiregy yfor g Capacity shortfall in year CapShorty y Dispatch level of generating unit period continuous GenLoadgt gin t Unserved energy in dispatch period continuous USEt t We also define the following parameters: Element Description Unit Discount rate D Number of hours in dispatch period hours Lt t Build cost for generator $ BuildCostg g Cost of retirement for generator $ RetireCostg g Maximum generating capacity of generator MW Pmax g Existing number of generating units Unitsg g Maximum power demand in year MW PeakLoady y
The Plexos description of the LT Plan model formulation is below. LT Plan Formulation The capacity expansion problem is formulated in PLEXOS as a Mixed-Integer Linear Program (MILP or MIP for short). To illustrate the very core of this formulation, we develop the following simplified formulation. NOTE: The following description is illustrative only, and shows only the core of the LT Plan MIP formulation. Definitions Let us define the following variables: Variable Description Type GenBuildgy Number of generating units built in year yfor Generator g integer GenRetiregy Number of generating units retired in year yfor Generator g integer CapShorty Capacity shortfall in year y GenLoadgt Dispatch level of generating unit gin period t continuous USEt Unserved energy in dispatch period t continuous We also define the following parameters: Element Description Unit D Discount rate Lt Number of hours in dispatch period t hours BuildCostg Build cost for generator g $ RetireCostg Cost of retirement for generator g $ Pmax Maximum generating capacity of generator g MW Unitsg Existing number of generating units g PeakLoady Maximum power demand in year y MW
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