非线性系统的多模型DMC解耦设计  

Multi-model DMC Decoupling Design Method for Nonlinear Systems

作　　者：薛美盛[1] 杨彦波[1] 魏衡华[1] 樊弟[1] 

机构地区：[1]中国科学技术大学自动化系,安徽合肥230026

出　　处：《控制工程》2011年第6期922-926,共5页Control Engineering of China

基　　金：国家高技术研究发展计划项目(2007AA04Z195);国家水体污染控制与治理科技重大专项课题(2008ZX07010-003)

摘　　要：针对工业生产过程大多为多输入多输出非线性系统,干扰因素多,耦合作用强,常规控制方法难以获得满意控制效果的特点。提出一种基于动态矩阵控制(DMC)的多模型控制方法,采用误差指标切换函数作为切换准则,根据其最小值来选择与实际最接近模型,并将基于此模型的控制器切换为当前控制器。结合目标函数解耦方法,在模型中考虑其他通道输入对当前通道输出的影响,且目标函数中用控制量增量替代控制量,既能防止控制量变化过于剧烈,又可实现解耦。同时,引入的误差观测器,可以根据各个回路实际输出与其设定值的偏差大小,实时改变当前回路设定值跟踪权矩阵,起到进一步解耦作用。最后,给出球磨机模型的仿真结果,验证新算法的优越性。To the feature of the most industry processes with multiple - input multiple - output, disturbance and coupling, which is difficult to get satisfied effect by the conventional control methods, a multi - model control method based on the dynamic matrix control （DMC） is proposed. The model best matching the current dynamics of the system is chosen, and the corresponding controller is applied to the system based on the switching index function. Based on the objective function decoupling method, the effect of the input of other channels to the output current channel is considered. The control variables in the objective function is replaced by the increments of control variables, which can weaken the great changes in the increments of control variables and achieve the aim of deeoupling. The proposed error observer can change the error weight matrixes according to the errors between references and system outputs, can further weaken the coupling. The simulation results of a ball mill show the superiority of the proposed algorithm.

关 键 词：多模型 目标函数解耦 动态矩阵控制 误差观测器 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]