A New Approach For Reliability Evaluation Of Interconnected Power Systems
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1993 Institute of Eleclrical and Electroic Engineers (IEEE) and the Naliorial Tecliriicnl University, Aiheris, Greece. Reliability of interconnected power systems is an important area of investigation. One of the important analytical methods is the Simultaneous Deconiposition- Simulation (SiDeS) [5,6]. A major drawback of SiDeS method is that the efficiency of the decomposition process decreases rapidly as the probability of the sets gets smaller and smaller. After a few iterations, the number of states being classified in some of the arcs falls to just one state. Consequently, the number of sets being generated is very large for a moderate number of areas. The number of sets generated has serious implications on the storage requirements and frequency calculations which depends on the examination of subset intersection. A new Preferential decomposition method [8] has been developed which tremendously decreases the number of sets being generated. There are five concepts used to analyze the decomposition of U-scts and L-sets based on the characteristics of the maximum state of the set being decomposed. These concepts maximize the states in gener-ated A-sets and D-sets. Consequently, the number of sets being generated for a particular threshold value is far less than the earlier approach. Computational efficiency and saving in memory are reported for various ease studies. A speed up of 5-10 times is obtained in CPU time depending on the size of system. Memory savings in sets are in many orders of magnitude depending on the size of the system and maximum capacity of the tie lines. The case studies reported here are for 5-area and 10-area interconnection which have identical IEEE-UTS systems.
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Proceedings. Joint International Power Conference Athens Power Tech,
