Browsing by Author "Rosehart, William D."

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Bifurcation analysis of various power system models
(Elsevier, 1999-02-01) Rosehart, William D.; Cañizares, Claudio A.
This paper presents the bifurcation analysis of a detailed power system model composed of an aggregated induction motor and impedance load supplied by an under-load tap-changer transformer and an equivalent generator and transmission system. Different modeling levels with their respective differential-algebraic equations are studied, to determine the minimum dynamic model of the system that captures the most relevant features needed for bifurcation studies of power systems. An aggregated model of a realistic load is used to illustrate the ideas presented throughout the paper.
Effect of detailed power system models in traditional and voltage-stability-constrained optimal power-flow problems
(Institute of Electrical and Electronics Engineers (IEEE), 2003-02-28) Rosehart, William D.; Canizares, Claudio A.; Quintana, Victor H.
In this paper, detailed generator, exponential load, and static volt-ampere-reactive (VAr) compensator models are incorporated into traditional and voltage-stability-constrained optimal power-flow problems to study the effect that the different models have on costs and system-loadability. The proposed models are compared to typical models by means of a detailed analysis of the results obtained for two IEEE test systems; interior point methods are used to obtain numerical solutions of the associated optimization problems.
Multiobjective optimal power flows to evaluate voltage security costs in power networks
(Institute of Electrical and Electronics Engineers (IEEE), 2003-05-31) Rosehart, William D.; Canizares, Claudio A.; Quintana, Victor H.
In this paper, new optimal power flow (OPF) techniques are proposed based on multiobjective methodologies to optimize active and reactive power dispatch while maximizing voltage security in power systems. The use of interior point methods together with goal programming and linearly combined objective functions as the basic optimization techniques are explained in detail. The effects of minimizing operating costs, minimizing reactive power generation, and/or maximizing loading margins are then compared in both a 57-bus system and a 118-bus system, which are based on IEEE test systems and modeled using standard power flow models. The results obtained using the proposed mixed OPFs are compared and analyzed to suggest possible ways of costing voltage security in power systems.