大容量电弧炉暂态电能质量研究  

Research on Transient Power Quality of Large-capacity Electric Arc Furnace

作　　者：杨柳 谭亲跃[1] 熊迪 YANG Liu;TAN Qinyue;XIONG Di(College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China)

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《工业加热》2021年第5期4-7,共4页Industrial Heating

基　　金：国家自然科学基金面上项目(51577157);陕西省自然科学基金(2019JM-357)。

摘　　要：大容量电弧炉引起的暂态电能质量指标超限已成为影响电力系统安全稳定运行的突出问题。根据电弧燃烧不同阶段的电磁特性得出电弧炉电压和电流的关系,并考虑随机模块和混沌电路模拟电弧的随机变化和电弧电压的混沌现象,建立适合于暂态电能质量问题研究的电弧炉模型。以50 t交流电弧炉为例,分析电弧炉在三相短路时的无功冲击以及对公共连接点(PCC)电压的影响,并用所建模型对电弧炉三相短路进行了仿真试验。结果表明,试验结果与理论分析吻合,验证了该模型的正确性和有效性。三相短路时,10 ms内,无功冲击是正常运行时6倍,短路电流是正常运行时电流的2.66倍,PCC电压有效值下降了40.37%,这为冲击性无功实时补偿和电弧炉暂态电能质量改善提供了理论依据。The overrun of transient power quality index caused by the large-capacity electric arc furnace(EAF)has become a prominent problem affecting the safe and stable operation of the power system.According to the electromagnetic characteristics of the arc combustion at different stages,the relationship between the voltage and current of the EAF is obtained,the random change of the arc and the chaotic phenomenon of the arc voltage are simulated by the random module and chaotic circuit,then an EAF model suitable for the study of transient power quality problems is established.Take 50 t AC EAF as an example to analyze the reactive power impact and the influence on the point of common coupling(PCC)voltage caused by the three phase short circuit of the electrode,and simulating the three-phase short circuit of the EAF with the built model.The results show that the experimental results are consistent with the theoretical analysis,verifying the correctness and effectiveness of the model.When the three-phase short-circuit occurs,within 10 ms,the reactive power impact is nearly 6 times that of normal operation,the short-circuit current is 2.66 times that of normal operation,and the effective value of the PCC voltage has dropped by 40.37%,which provides a theoretical basis for real-time compensation of impulsive reactive power and improvement of the transient power quality of the EAF.

关 键 词：电弧炉 非线性 暂态电能质量 无功冲击 电压暂降 

分 类 号：TF741.5[冶金工程—钢铁冶金]