Analysis of flicker generation in DC arc furnaces

This paper presents an analytical method to evaluate instantaneous flicker sensation due to sinusoidal perturbation of arc parameters in DC electrical arc furnaces (EAF) including most of the important design and control parameters. The method is based on the modeling in the frequency domain of the linearized dynamic behavior of the main components of DC EAF, such as the AC/DC thyristor rectifiers, thyristor controlled reactors (TCR), and reactive power transducer. This approach is a useful tool for understanding the impact of different design parameters on voltage fluctuation and for deriving design criteria for the parameters of current regulators, harmonic filters, smoothing chokes, synchronizing scheme, and reactive power transducers.