A novel integrated long-term generation maintenance coordination and midterm security-constrained unit commitment from ISO's perspective

Document Type : Original Article


1 Department of electrical and computer engineering, Shahid Beheshti University, Tehran, Iran

2 Iran Grid Management Company,Tehran,Iran


In a restructured power system, generation maintenance scheduling makes a significant effect on the operation and planning of the power system. Optimal maintenance schedule would improve power system reliability; as it can reduce unplanned outages and avoid high costs of production losses. Moreover, planned outages may be cut down by avoiding unnecessary maintenance activities. Therefore, it is crucial to study approaches for the generation maintenance schedule. In this paper, a novel approach for the long-term generation maintenance scheduling is proposed which mainly focuses on the ISO’s perspective. The approach benefits from the reliability centered maintenance concept by employing criticality indices in the scheduling model. Besides, it founded on new-defined maintenance proposals which would be submitted by generation companies and would make the model more realistic. The coordination between maintenance scheduling and security-constrained unit commitment problem is considered in this study. The model is solved by a mixed integer and real coded genetic algorithm which is combined with a quadratic programming solver. For systematic analysis, the IEEE 30-Bus is employed and the results are presented which emphasize the effectiveness and applicability of the proposed approach.


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