This thesis proposes a mathematical model to operations planning of composite hydro-thermal-pumped storage power system. Two major decisions are made when planning the operations of a composite power system over a time horizon.
The "Unit Commitment Decision" indicates what generating units are to be in use at each point in time. The "Economic Dispatch" decision is the allocation of system demand among the generating units in operations at any point in time.
Both these decisions must be considered to achieve a least-cost schedule over time horizon. Because of hydro unit characteristics, the model becomes too big multi-period problem to be solved, as the time horizon gets longer.
To make the problem small enough to handle, the operations planning problem is made of two models, "long range model" and "short range model". Long range model determines hydro generation amount that should be generated in each short time horizon, considered forecasted water inflow to hydro reservoir over long time horizon and reservoir capacity. With hydro generation amount given by long range model, short range model makes unit commitment decision and economic dispatch decision of each unit at any point of time over short time horizon.
Long range model is formulated by dynamic programming. Decision variable is hydro generation amount in each short time horizon and state variable is the amount of water stored in hydro reservoir.
Generation cost in each short time horizon is estimated by "probabilistic simulation model" considered unit forced outages.
Short range model is formulated by mixed integer programming, and determines up and down and generation amount of each unit at any point of time over short time horizon.