With the advocating of smart grids and the fact that the occurrence of blackouts is more and more frequent in the world, the robust monitoring and optimization of power markets become more and more critical. In this book, four main topics have been introduced: 1) state estimation with the consideration of FACTs devices; 2) harmonic state estimation; 3) observability analysis of state estimation; and 4) optimal placement of capacitors. Flexible A.C. Transmission systems can be used to control the branch flows in deregulated power systems. A solution scheme, that allows easy incorporation of FACTs variables into state estimation, is designed and implemented. Due to the increasing levels of harmonics in today's power systems caused by nonlinear devices. Harmonic state estimation problem is investigated. Novel methods for observability analysis is developed for state estimation: Determination of Observable Islands; Multiple Measurement Placement; and Extension of Hachtel's Augmented Matrix. Increasing number of nonlinear loads being connected to the distribution systems lead to power quality concerns by the electric utilities. This issue has also been studied in this book.

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