Identification Of Weak Transmission Lines For Effective Power Loss

Abstract

There are challenges in achieving this equitable loss allocation in power systems, which may lead to complicated methodological implications. This complexity inhibits the achievement of timely loss allocation hence overall system performance.  The concept of topological-based solution for loss allocation is considered for intricate topological interconnections inherent in power systems. Having such a theoretical framework provides the basis that power does not circulate and losses are assigned throughout the network. The approach formulates the network losses from a topological viewpoint, thus evading the challenges associated with the selection of a slack bus in conventional load-flow analysis. This view not only brings greater precision in the calculations of power losses. The weakest and strongest transmission lines are then identified from the transmission line coupling strength of the network. Identification of these critical components enables illumination of the structural weaknesses and strengths of the power system. The study uses a 5-bus system of IEEE, 10-bus power system, standard IEEE 14-bus system and the Nigerian 28-bus power system to demonstrate the effectiveness of the method. This study deals with estimation and allocation of losses with respect to base case scenarios and contingency situations. The results obtained showed that bus 4 is the most vulnerable bus in the IEEE 5-bus system using the Degree centrality (DC), Eigenvector centrality (EC), Pagerank centrality (PRC), Closeness centrality (CC), Betweenness centrality (BC) and Node coupling (NC) methods. Also, in the IEEE 14-bus system, bus 8 is ranked number 1 by all the methods considered models. Also, in the Nigerian 28 bus system, Ajaokuta (bus 14) was seen as the most vulnerable bus