基于PCS7的内模控制器设计与应用  

Design and Application of Internal Model Controller Based on PCS7

作　　者：马昕[1] 王平[1] 李文博[1] 张贝克[1] 

机构地区：[1]北京化工大学信息科学与技术学院,北京100029

出　　处：《计算机测量与控制》2010年第10期2285-2288,共4页Computer Measurement &Control

摘　　要：针对工业对象的高阶以及非线性特性,采用二阶加纯滞后模型作为内模控制的内部模型,提出了一种通用内模控制器的设计方法;根据内模控制的原理以及二阶加纯滞后模型的差分方程,推导出通用内模控制器的算法,通过PCS 7 V6.1系统软件中的结构化控制语言SCL将内模控制算法编译成可通用的FB功能块,在西门子过程控制系统PCS7中实现了内模控制;最后利用精度较高的最小二乘法辨识被控对象的模型,将该通用内模控制器应用在工业中普遍使用的高阶大滞后对象换热器的出口温度控制过程中,取得了很好的应用效果;应用表明,内模控制器在工业DCS应用过程中具有高性价比,能有效地拓展内模控制的应用空间。Second-order with pure time-delay model was adopted as internal model of internal model control for high order and nonliner feature of industrial objects,the design method of common internal model controller was put forward.The common internal model controller algorithm is deduced by internal model control theory and difference equoation for second-order with pure time-delay model,the internal model control algorithm is compiled as a general function block FB through the structured control language SCL in the system software of the PCS7 V6.1,internal model control has been achieved in the SIMATIC process control system PCS7.Then,the object model was identified as a second-order with pure time-delay model through the least squares method,a higher accurate identification method.The common internal model controller was used to control the outlet temperature of the heat exchanger,which was a typical high-order and large time-delay object used widely in industrial process,the result achevied was satisfactory.The control results show that the internal model controller in industrial DCS application proceess has a cost performance,and can effecively extend the application room.

关 键 词：二阶加纯滞后模型 内模控制器 PCS7 SCL 加热炉出口温度 

分 类 号：TP273.5[自动化与计算机技术—检测技术与自动化装置]