Optimum long-term hydrothermal coordination with fuel limits

Optimizing the thermal production of electricity in the long term, once the maintenance schedules have been decided, means optimizing both the fuel procurement policies and the use of fuels for generation in each thermal unit throughout the time period under study. A fundamental constraint to be satisfied at each interval into which the long time period is subdivided is the covering of its load duration curve with thermal and the stochastic hydrogeneration. A new procedure to optimize this problem is proposed. It is based on the use of a power-energy function for each interval, which changes with the deterministic and stochastic hydrogeneration and with thermal generation. Through this function the generation duration curves that come from the load duration curves of all intervals, are matched