| 摘要 |
The invention relates to electric engineering, in particular to electric power supply of DC arc steel-casting furnace. A system of electric power supply of DC arc steel-casting furnace comprises a high harmonic current controlled filter, a voltage measuring element, a current measuring element, a high current harmonic controlled filter control system, a power source, a furnace transformer unit comprising in series connected autotransformer with an auxiliary winding and a furnace transformer, to whose outputs the DC arc steel-casting furnace is connected, buses of furnace substation, a frequency converter, a frequency converter control system, a bank of capacitors, the current measuring element and furnace buses are in series connected to the power source, to said buses the high current harmonic controlled filter is connected, which comprises in series connected bank of capacitors and a filter reactor with an auxiliary winding, which is magnetically connected to the main winding, in series connected adjustable resistor and inductance are connected to the terminals of filter reactor auxiliary winding, whose control inputs are connected to the outputs of high current harmonic controlled filter control system, whose first input is connected to the output of voltage measuring element, the second input of high current harmonic controlled filter control system is connected to the output of voltage measuring element, whose input is connected to the furnace substation buses, to which the input of furnace unit is connected; to the furnace transformer unit auxiliary winding a frequency converter first input is connected, to whose output the banks of capacitors are connected, the output of frequency converter control system is connected to the second input of frequency converter, whose first input is connected to the output of current measuring element, the second input of frequency converter control system is connected to the output of voltage measuring element, the third input of frequency converter control system is connected to an output of power factor setting unit. The technical result of the invention is improvement of power supply of arc furnace due to voltage regulation. |
