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电弧炉在冶炼过程中,其电流含有快速、不规则变化的无功功率和高次谐波,从而引起电压闪变.日本东芝公司开发了容量为5MVA 的闪变抑制装置,该装置采用了开关频率为500Hz 的大功率 GTO(4500V/2500A),通过多重变压器使其等效载波频率达到4kHz。采用了能量回收型吸收电路,从而提高了设备的运行效率,连续过负荷能力为10MVA.控制回路采用计算瞬时有功/无功功率的方法,通过闪变抑制装置补偿由电弧炉产生的快速、不规则变化电流。
Electric arc furnace in the smelting process, the current contains fast, irregular changes in reactive power and higher harmonics, which led to voltage flicker Japan Toshiba Corporation has developed a capacity of 5MVA flicker suppression device that uses the switch High-power GTO (4500V / 2500A) with a frequency of 500Hz achieves an equivalent carrier frequency of 4kHz through multiple transformers. The energy recovery type absorption circuit is adopted to improve the operation efficiency of the equipment, and the continuous overload capacity is 10MVA. The control circuit adopts the method of calculating instantaneous active / reactive power, compensates the fast generated by the electric arc furnace through the flicker suppression device, Rules change current.