Power supply device and power supply method for direct current electric arc furnace

Abstract

The present invention provides a power supply device and a power supply method for a DC electric arc furnace, wherein the power supply device comprises phase-shifting rectifier transformers, rectifying units and a regulator; through a structural design of a plurality of branches and a plurality of rectifying units at an output end of each phase-shifting rectifier transformer, and a structural design that outputs of the plurality of rectifying units are connected in parallel and then connected to a power supply short network of a DC electric arc furnace through bus bars, a current output topological structure is formed, which can provide a stable large current for one electrode assembly, and a plurality of current output topological structures can supply power to a plurality of electrode assemblies, so that requirement of a larger power supply current of the DC electric arc furnace can be satisfied; positions of top electrodes are judged and adjusted by the regulator according to real-time working parameters, which ensures that a lifting mechanism of the top electrodes can steadily perform the function of stabilizing arc burning for a long time; at the same time, output voltages and output currents of the rectifying units are adjusted by the regulator according to feedback of the real-time working parameters, so as to provide stable electric energy for the DC electric arc furnace.