Abstract
This paper presents a mixed integer programming model for scheduling the periodical maintenance of thermal and nuclear generating facilities in an electric power system. The periodical maintenance has an impact on system reliability and economics because of planned outages. The system reliability should be the first consideration over the system economics. Based on the idea, first, a maintenance scheduling problem is formulated so as to maximize the minimum reserve capacity under various constraints. This max-min problem can be solved by a mixed integer programming technique. Next, the first object function is modified in order to improve the system reliability by aiming at leveling reserve capacities over a given period as well as possible. Economic facts are handled as simultaneous constraints of allowable maintenance number of thermal generating units which have similar fuel cost curves. The proposed method is tested in a middle-scale power system model. The computational results show that the reliable and economic maintenance schedule is obtained in a practical computer time and the proposed method is a feasible and useful tool.
