On the Subtransmission Systems Reliability Analysis Based on Optimal Load-Shedding Correlated between Load-Points

The technique proposed in this paper is based on a combined analysis of the reliability assessment of the branch-node model of the subtransmission system and on "one by one" reliability assessment of the substations of the subtransmission system. In the combined analysis, first, a classical state enumeration reliability analysis is performed for the branch-node model of the subtransmission system, second, by considering "one by one" the substations of the subtransmission system, a state enumeration process is applied to each one to obtain the correlated load-shedding between the substations of the subtransmission system, and finally, the reliability indices calculated in the first and second stages are combined to obtain accurate reliability indices from the viewpoint of the overall system and the load-node. Test results show that the proposed methodology is suitable both for planning studies and for 24 hours-ahead preventive reinforcement and security assessment. Copyright (C) 2012 Praise Worthy Prize S.r.l. - All rights reserved.