基于内模原理的轧机传动机电振动H_∞控制  

H_∞ Control for Electromechanical Vibration of the main Drive System of Rolling Mill Based on Internal Model Theory

作　　者：郭香云[1] 张瑞成[1] 童朝南[2] 

机构地区：[1]河北理工大学计算机与自动控制学院,河北唐山063009 [2]北京科技大学信息工程学院,北京100083

出　　处：《计算机仿真》2007年第12期315-319,共5页Computer Simulation

摘　　要：轧机驱动电机与轧辊间采用长轴连接,连接轴刚度有限,因此在带材高速轧制时,常规电流、转速双闭环控制易产生机电振动和断带现象。为了抑制机电振动,保证对干扰有良好的动态抑制作用且无静态扰动误差,同时使系统具有鲁棒稳定性,将内模原理与H∞控制理论相结合,通过选取适当的加权函数,设计了轧机主传动系统机电振动鲁棒控制器,为了能方便地在实际工程中实现复杂的H∞控制器,采用PID控制器逼近所得高阶控制器。同时为了改善控制系统的跟踪性能,在H∞控制器的基础上设计了两自由度控制器,有效减小了系统的超调。仿真研究结果表明:该方法不仅有效抑制了轧机主传动系统的机电振动,而且减小了轧制负荷扰动引起的动态速降。In rolling mill,the distance between drive motor and roll is long,and the rigidity of its spindle is limited.The normal control of speed and current closed loop is easy of leading to the phenomenon of electromechanical vibration and broken strip.In order to suppress electromechanical vibration,restrain the disturbance of the main drive system dynamically and without static error induced by disturbance and guarantee robust stability,H∞ control theory is combined with internal model theory.An electromechanical vibration robust controller of the main drive system of rolling mill is designed by selecting proper weighting functions.In order to implement the complex controller,a method to reduce it to a PID controller is proposed.At the same time,the two-degrees-of-freedom（TDOF） controller based on the H∞ controller is designed to improve the tracking characteristics of the commanded system.The simulation results show that this controller not only effectively suppresses the electromechanical vibration of the main drive system,but also reduces the dynamic speed fall caused by load disturbance.

关 键 词：轧机 机电振动 内模原理 两自由度 鲁棒控制 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]