Journal Volume 11 Issue 1

Advantages of changing 3-phase arc furnaces asymmetry estimation criteria in international and european standards

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Janusz Białek, Andrzej Wąsowski

The criteria for estimating the asymmetry of arc furnace circuit impedances, referring to the theory of symmetrical components, have been presented. In contrast to the criteria recommended as yet by IEC and CENELEC, they give homogeneous estimation of asymmetry of circuit impedances, heating powers and unbalance of arc currents. Moreover they make it possible to take into account functional dependences among them and, consequently, to improve the analysis of unbalanced operation states of EAF, as well as their balancing.

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Optimal placement and sizing of distributed generator units using genetic optimization algorithms

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Edwin Haesen, Marcelo Espinoza, Bert Pluymers, Ivan Goethals, Vu Van Thong, Johan Driesen, Ronnie Belmans, Bart De Moor

In this article the authors describe how genetic optimization algorithms can be used to find the optimal size and location of distributed generation units in a residential distribution grid. Power losses are minimized while the voltage profile is kept at an acceptable level. The method is applied on a system based on an existing grid topology with production and residential load data based on measurements. Different scenarios are chosen to run the algorithm. The obtained optimal location and size prove to depend strongly on the given conditions.

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