Abstract

GONZALEZ CASTANO, Catalina; ALZATE GOMEZ, Alfonso  and  MARULANDA DURANGO, Jesser James. Electric arc furnace models for flicker study. Tecnura [online]. 2016, vol.20, n.48, pp.15-27. ISSN 0123-921X.  https://doi.org/10.14483/udistrital.jour.tecnura.2016.2.a01.

Objective: The aim of this paper is to evaluate voltage fluctuations or flicker of two electric arc furnace models through comparison with real data. Method: The first proposed model is founded on the energy conservation principle, which generates a non-linear differential equation modelling the electric arc voltage - current characteristics. Voltage fluctuations are generated using a chaotic circuit that modulates the amplitude of arc voltage. The second model is based on the empirical relationship between the arc diameter or length as well as voltage and electrical current on the arc. Voltage fluctuations are considered adding a random signal in the arc length. Both models are implemented in PSCAD^TM. Results: The results of both models are compared with real data taken at the most critical stage of the operation of the furnace, and they show that the model based on energy conservation has a lower average mean square error in the voltages and currents 5.6 V and 1.7 kA against 27,2 V y 3.38 kA obtained with the second model. Conclusions: Both models consider the nonlinearity and random behavior present in this type of load, validating their inclusion in computer models of electric power systems.

Keywords : Arc furnace; dynamic models; harmonics.

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