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This paper describes modular and flexible software developed for medium-term and short-term hydro-thermal generation scheduling. Both the medium-term and short-term programs model a wide range of system characteristics, including physical and operational constraints such as area interchange and reserve constraints. A matrix generator generator (MGG) program is used to develop a matrix generator (MG) program for implementing the hydro-thermal scheduling problem formulation. This approach facilitates the task of modifying the model or the mathematical problem formulation. The matrix generator which is integrated with the scheduling software is developed so as to provide the capability for exercising different modeling options. A novel modeling approach for the medium-term program is used which divides the planning period into two parts with different time resolutions. A chronological load model is used for the first part and a load duration model is used for the second part. This approach achieves a compromise between model detail and problem size and computational requirements. The hydrothermal scheduling optimization problems are solved by linear programming, using the large-scale optimization package MINOS.

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