Abstract
Three-phase busbar voltage solutions, derived from the Y-bus network model and unbalanced current injections, are used in a variety of three-phase power system analysis applications, such as Z-bus power flow and short circuit studies. When phase coordinate analysis is used to solve these problems, existing techniques can result in divide-by-zero errors. These errors occur when the network contains one or more islands conductively isolated from the ground. This paper combines the limit processes of calculus and linear circuit analysis to derive an algorithm which can perform a LDL/sup T/ factorization of the phase coordinate Y-bus model of such networks. This factorization can then be used to solve for voltages in islands conductively isolated from ground, yet energized through magnetic coupling to one or more islands with a ground reference. >
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