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A Comparative Study of AC/DC Converters for High-Power DC Arc Furnace

机译:大功率直流电弧炉交流/直流转换器的比较研究

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摘要

Today, dc arc furnaces are supplied by thyristor rectifiers. Because of the phase control strategy on the rectifiers, the arc voltage swings induce large reactive power variations on the power network and a static var compensator (SVC) or a static synchronous compensator (STATCOM) is always added to avoid flicker effect. In this paper, the authors present a new control strategy which suppress the flicker effect and increases the furnace productivity. To supply the dc arc furnace, the ac/dc converter is based on diode rectifiers and choppers with a constant power control strategy. Consequently, the ac/dc converter can operate without a STATCOM or an SVC. To evaluate the gain in flicker and furnace productivity, simulations are done with Matlab software. These simulations take into account arc voltage measurements on a 100-MW dc arc furnace and allow for comparison of the different solutions.
机译:如今,直流电弧炉由晶闸管整流器提供。由于整流器的相位控制策略,电弧电压摆幅会在电网上引起较大的无功功率变化,因此始终添加静态无功补偿器(SVC)或静态同步补偿器(STATCOM)以避免闪烁效应。在本文中,作者提出了一种新的控制策略,该策略可以抑制闪烁效应并提高炉的生产率。为了向直流电弧炉供电,交流/直流转换器基于二极管整流器和斩波器,具有恒定的功率控制策略。因此,AC / DC转换器无需STATCOM或SVC即可运行。为了评估闪烁和熔炉生产率的提高,使用Matlab软件进行了仿真。这些模拟考虑了在100 MW直流电弧炉上的电弧电压测量,并允许比较不同的解决方案。

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