APPLICATION OF GREY LINEAR-PROGRAMMING TO SHORT-TERM HYDRO SCHEDULING

An approach using linear programming based on grey constrained interva l is applied to solve the short-term hydro scheduling problem. A chara cteristic feature of this approach is that the errors in the forecast hourly loads and natural inflows can be taken into account by using gr ey number notation, making the approach superior to the conventional l inear programming method in which the hourly loads and natural inflows are assumed to be exactly known and there are no errors in the foreca st loads and natural inflows. To reach an optimal scheduling under the uncertain environment, a grey linear programming model in which the h ourly loads, the hourly natural inflows are all expressed in grey numb er notation, is developed. The developed grey linear programming appro ach is applied to schedule the generation in the Taiwan power system. It is found that the proposed approach is very effective in obtaining proper hydro generation schedules in uncertain conditions. (C) 1997 El sevier Science S.A.