A Study of Pulsed Regulator of Electric Current for DC Arc Furnaces

Resumo

A method for studying pulse regulator of electric current for dc arc furnaces is proposed. The practicability of replacing power supplies based on controlled rectifiers to the transistor pulse-width transducers is illustrated. The structural scheme of the current regulator is substantiated using an imitating model designed in the Simulink environment, which allows one to analyze and synthesize the regulation system. To obtain generalized dependences of regulator performance indicators on its parameters for a wide class of dc arc furnaces, a system of relative parameters is introduced. A method for studying a pulse regulator of the arc current, which is based on waveforms of transient functions of changing voltages of the power supply and the arc, as well as electric current of the arc. The dynamic characteristics of arc current regulators with power supplies based on a regulated constant voltage, a controlled rectifier, as well as a pulsed power supply with pulse-width modulation, are compared and analyzed.