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电弧炉电气系统的模型、谐波分析及电极调节系统自适应控制的研究
【作者】 刘小河；
【导师】 崔杜武；
【作者基本信息】 西安理工大学 ， 电力电子与电力传动， 2000， 博士
【摘要】 本文研究了电弧炉电气系统的数学模型、谐波分析及电弧炉电极调节系统的自适应控制问题。 本文从交流电弧的物理机理出发，提出了交流电弧的电路模型，并给出了确定电弧参数的工程估算方法，通过仿真验证了该模型的有效性。在此基础上，导出了电弧炉电气系统的状态方程。 本文以实际的电弧炉系统为背景，进行了谐波分析的数字仿真研究。与实测结果对比表明，本文所提出的电弧炉系统模型可以近似再现实际系统的典型谐波。在此基础上，对电容对系统谐波的影响、LC无源滤波器的抑制谐波效果、电弧非线性对系统特性的影响进行了仿真研究。对电弧炉系统谐波分析的频域方法及电弧炉主电路仿真系统的研制，进行了较为详细的讨论。 针对电弧炉系统所代表的一类非线性系统，本文提出了非线性系统模型参考自适应控制的分段线性化方法，并将其应用于三相电弧炉电极调节系统的自适应控制研究之中，设计了三相电弧炉自适应电极调节系统。通过仿真表明：该系统具有很好的抗扰动能力，其控制效果大大优于PID控制系统。最后，介绍了三相电弧炉电极调节系统自适应控制仿真软件EAF1.0的主要功能。
【Abstract】 In his paper, the problems of mathematical model of the arc furnace electricpower system, harmonic analysis and adaptive control of arc furnace electrodecontrolling system are researched.On the physical mechanism of alternating - current arc, the circuit model ofalternating arc is put forward in this paper, and engineering estimating method of thearc parameters is given. The availability that model reflect external characteristiccurve of alternating arc is verified through simulation, and then the state equation ofarc furnace electric system is studied.The research of digital simulation of harmonic analysis is made with the realbackground of arc furnace electric system in the paper. It is made known that themodel of arc furnace electric system can reappear approximately typical harmonicof real system contrasted with measuring value. Based on that, the simulationsare engaged in effect of capacity on system harmonic, the effect of suppressedharmonic of LC passive filter and the effect of arc nonlinear on the systemcharacteristics. It is discussed in more detail on frequency method of harmonicanalysis of arc furnace electric system and on the development of simulative systemof arc ftrnace main circuit.Being aimed at a class of nonlinear system with arc furnace system, apiecewise-linear method of model reference adaptive control of some nonlinearsystems is advanced in this paper. Then it is applied in research of adaptivecontrol of three-phase arc furnace adaptive electrode regulating system. Thethree-phase arc furnace adaptive electrode regulator is designed. The results ofsimulation show that the adaptive control system has a much stronger capability ofrestraining disturbance than a PID control system. Lastly, the function of