Maintenance scheduling based on two-level hierarchical structure to equalize incremental risk

A method of maintenance scheduling is proposed that is based on the goal of equalizing incremental risk, such as loss-of-load-probability (LOLP) throughout the year, rather than on equalizing risk or reserve. To simplify the combinatorial problem and optimize the maintenance scheduling, an approach based on two-level hierarchical structure model is proposed for the maintenance scheduling. An example of a system with 19 generating units having differing maintenance periods is used to illustrate the application of the approach. The results show that the approach is profitable and efficient for large-scale power systems