A clipping-off interior-point technique for medium-term hydro-thermal coordination

This paper presents a clipping-off interior-point algorithm for hydro-therm al coordination which allocates hydro and thermal resources in order to min imize the cost. The clipping-off algorithm basically consists on setting di e control variables to their upper or lower bounds if certain conditions ar e met, and eliminating them as variables from the problem formulation there after. The number of Bops and iterations to obtain the problem solution is considerably reduced as compared to a standard interior-point solution; how ever, the solution obtained by either method is the same. Based on the hydr o-thermal power system of Spain, computational examples are presented, thes e examples are used to compare the proposed clipping-off predictor-correcto r log-barrier algorithm with the standard predictor-corrector and the stand ard log-barrier algorithms.