FUZZY-PID底吹氩控制系统及其仿真

The FUZZY-PID Control System for Blowing Argon at Bottom and Its Simulation

介绍了LF精炼炉底吹氩过程控制系统工作原理、测试法建模、控制策略及控制系统的实现。通过对精炼炉底吹氩过程控制系统进行研究与分析,并根据测试法建模的有关知识以及有关数据,建立起了被控对象的数学模型。在此模型的基础上,从底吹氩工艺要求和控制系统的实际情况出发,提出基于模糊理论及PID理论相结合的控制方案,以解决在精炼炉底吹氩过程中,由于被控对象的非线性、数学模型参数的不确定性及系统工作点的剧烈变化等因素,而引起的对被控量不能进行精确控制的缺陷。通过理论分析和仿真结果表明,应用FUZZY PID控制方法在各种指标上都要优于常规PID控制方法。

The work principle of blowing argon at bottom of Ladle furnace system is introduced in this paper, A mathematical model is presented according to experimental data and an appropriate strategy is applied to this system. Through the study and analysis of bottom blowing argon process control system, the thesis discusses the mathematical models of controlled object according to experimental data and related knowledge. To begin with the craftwork re- quirements of bottom blowing argon and the actual instance of the control system, a project that combines the fuzzy with PID is put forward in order to solve in the bottom blowing argon process, the nonlinear character of controlled object, incertitude of parameter of mathematical models and sharp change of systemic workpoint, all of these are responsible for the defect of imprecisely controlling controlled variant. Theoretical analysis and the results of simulation show that this FUZZY -PID control method surpasses only PID method in all specifications.