【作者】 杨硕；

【导师】 张福民；

【作者基本信息】 河北工业大学 ， 电气工程， 2015， 硕士

【摘要】 交流电弧炉作为现代炼钢的典型设备,由于其经济效益突出,广泛存在金属冶炼行业中,本文以电弧炉为主要研究对象,针对其工作原理和用电特性而展开研究,并对其进行补偿,从而改善周边电气系统的运行特性。对于电弧炉的无功补偿,世界范围内大部分钢铁行业采用静止无功补偿器(SVC)来解决这一问题。但是因为电弧炉的工作特性使电流急剧变化,SVC的反应速度不能实时跟随电流变化,同时补偿装置的响应速度快慢性直接关系到电压闪变和波动的抑制效果,所以在人们越来越重视电能质量的今天,SVC的补偿效果远远低于要求。本文通过比较SVC和STATCOM的各自特点,决定选择用STATCOM来取代SVC,对钢铁行业进行补偿。本文详细阐述了STATCOM作为SVC换代产品的各种优势,介绍STATCOM的工作原理,应用级联式STATCOM对电弧炉进行补偿。首先文中介绍了电弧炉的工作特性,引起无功波动和系统不平衡的原因,其次阐述了理论基础瞬时无功功率理论和动态补偿原理。本文不但对电弧炉的无功分量进行补偿,而且进行负序补偿,指出在电弧炉引发系统不平衡的情况下,电压不对称不仅会影响其无功补偿性能,更会导致装置损坏或者退出运行。针对这一问题,推导出系统不平衡时装置的运行特性,利用对称分量法和坐标变化对系统将不平衡电压的正负序分量进行分离,并在此基础上提出了基于反馈线性化的正负序双环控制策略,从而解决了系统不平衡情况下的装置的负序补偿和无功补偿问题,通过仿真验证其有效性。更多还原

【Abstract】 The arc furnace as a typical form of modern steelmaking equipment, owing to its remarkable economic benefits, widely existed in the metal smelting industry.Based on the electric arc furnace as the main research object, according to its working principle and electric characteristic, this paper studied it, and carried on the reactive power compensation, thus improving the electrical characteristics for surrounding system. The most of the world steel industry used static reactive power compensator(SVC) to solve reactive power compensation for electric arc furnace. But because of current changed quickly, the response speed of SVC cannot follow the current real-time changes, at the same time corresponding compensation device of fast chronic was directly related to the inhibition effect of voltage flicker and fluctuations. So the compensation effect of SVC was far below the requirements. In this paper, by compared the respective characteristics of SVC and STATCOM, decided to choose to replace the SVC with STATCOM, compensated for the iron and steel industry.The various advantages of STATCOM has been described in detail, and the working principle of its application in compensation of electric arc furnace has been introduced also.The electric arc furnace operating characteristics has been introduced, the causes of reactive power fluctuation and unbalanced system, then expounded the theory basis of instantaneous reactive power theory and the dynamic compensation principle.This article not only compensated reactive power component but also compensated the negative sequence of electric arc furnace, pointed out that the system in electric arc furnace under the condition of unbalanced, voltage asymmetry not only affected the reactive power compensation performance,but caused the device damage or out of operation.In order to solve this problem, it derived the running characteristic at imbalance system, Using symmetrical component method and the coordinate change on system voltage imbalance to separate positive and negative sequence component, And according to this, advanced the positive and negative sequence double loop control strategy based on feedback linearization, so as to solve the unbalanced system situation and reactive power compensation device of the negative sequence compensation problem, whose effectiveness was verified by simulation.更多还原