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This paper is oriented to present a review of the main approaches commonly used to obtain voltage stability indices in electric power systems. Starting from classifications previously presented, the authors propose a complete review including several subcategories, which help to have a better understanding of these approaches. As strategy to adequately present this research, a chronologically ordered description and a classification of the most relevant characteristics of these proposals, which are aimed to obtain the voltage stability indexes in a time period from 1986 to 2012, is detailed analyzed. The considered classification criterion is related to the information requirements of each one of the reviewed approaches. Additionally, an analysis and a discussion of the evolution of the indexes proposals considering the new available metering equipment are developed. Finally, this review is useful as a reference for discussions related to methodologies associated to voltage stability indexes for electric power systems [ABSTRACT FROM AUTHOR]

This paper presents the design of an expert controller applied to voltage level control in a power system. The use of pilot node concept allows to keep stable the list of controllers against topological changes in the network. To achieve the optimal voltage profile, the Alberta Electric System Operator regulations are used. The controller validation is performed by simulating a case library and the solution is compared with results provided by an optimal power flow and a genetic based algorithm. The main advantage of the propose model is the unified treatment of the voltage profile and the reactive dispatch without the need of a two-step algorithm. The proposed controller is suitable for online real-time applications and it is flexible when dealing with problems that present a complex analytical formulation. [ABSTRACT FROM AUTHOR]