大型钢铁企业非线性负荷谐波来源及抑制方法研究

发布时间：2018-02-01 08:00

本文关键词： 电弧炉中频炉轧机谐波仿真治理　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着国家对节能减排政策的持续推进,大型钢铁企业小型转炉、高炉逐渐被淘汰,大容量、高功率电弧炉、中频炉和轧机越来越多被投入使用。这些电弧炉、中频炉和轧机工作时会产生大量高次谐波分量,注入供电系统引起严重的谐波干扰问题,已经威胁到系统的供电安全和经济运行。实际生产中,为满足国家标准对电能质量的规定,研究大型钢铁企业非线性负荷引起的谐波问题,并提出了进一步的相应治理方案,有利于钢铁行业和电力行业的相辅相成共同发展。本论文针对大型钢铁企业特点介绍了电弧炉、中频炉和轧机工作原理及在工作过程中产生的谐波电流对电力系统的危害,在此基础上建立了相应的数学模型及电路模型,并通过专业的电力系统仿真软件PSCAD/EMTDC仿真验证了模型的有效性。本论文以清远某钢铁企业及其附近供电电网的实际供电系统作为研究背景,搭建了包括大型电弧炉、中频炉及轧机等不同非线性负荷的供电系统模型,并定量计算了负荷峰值时刻流入电力系统的谐波电流值。并通过仿真模型的计算结果与实测值进行比较,验证仿真模型的实用性;最后,根据电弧炉、中频炉和轧机各自谐波特点,经过综合考虑提出了“FC+TCR”型SVC综合治理方案,并将治理后的效果进行了计算分析,以确保大型钢铁企业及配电网供电系统的安全稳定运行。清远某钢铁企业采取治理后,谐波抑制效果明显,证明了该方案的可行性及经济性。同时本论文对大型钢铁企业不同性质非线性负荷的模型搭建与仿真计算研究,对于大型钢铁企业的电力系统谐波分析、谐波预测及谐波治理等方面有一定应用意义。
[Abstract]:With the continuous promotion of national policies on energy saving and emission reduction, small converter in large steel enterprises, blast furnace is gradually eliminated, large capacity, high power arc furnace, intermediate frequency furnace and rolling mill are more and more put into use. These arc furnaces. If furnace and rolling mill work will produce a large number of high-order harmonic components, injection of power supply system caused serious harmonic interference, has threatened the power supply safety and economic operation of the system. In order to meet the requirements of national standards for power quality, harmonic problems caused by nonlinear load in large iron and steel enterprises are studied, and further corresponding treatment schemes are put forward. This paper introduces the electric arc furnace (EAF) according to the characteristics of large iron and steel enterprises. Based on the working principle of intermediate frequency furnace and rolling mill and the harm of harmonic current to power system, the corresponding mathematical model and circuit model are established. And through the professional power system simulation software PSCAD/EMTDC simulation to verify the effectiveness of the model. This paper takes the actual power supply system of Qingyuan iron and steel enterprise and its nearby power supply network as the research background. The power supply system models including large electric arc furnace, intermediate frequency furnace and rolling mill are built. The harmonic current value of the load peak moment flowing into the power system is calculated quantitatively, and the practicability of the simulation model is verified by comparing the calculated results of the simulation model with the measured value. Finally, according to the harmonic characteristics of electric arc furnace, intermediate frequency furnace and rolling mill, a comprehensive treatment scheme of "FC TCR" type SVC is put forward, and the effect after treatment is calculated and analyzed. In order to ensure the safe and stable operation of large iron and steel enterprises and distribution network power supply system. The feasibility and economy of the scheme are proved. At the same time, this paper builds and simulates the model of nonlinear load of large iron and steel enterprises with different properties, and analyzes the harmonic of power system for large steel enterprises. Harmonic prediction and harmonic treatment have certain application significance.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM711;TM714.3

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