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Vol. 154, Issue 7, July 2013, pp. 244-251




Internal Model Controller Design Method in Discrete Non-square Multivariable System
Jun Wan, Linfeng Qi, Qi Wang, Qibing Jin

Institute of Automation, Beijing University of Chemical Technology, Beisanhuan East Road 15, Chaoyang District, Beijing 100029, P. R. China
Tel.: +0086-13466652435, fax: +0086-010-64434941
E-mail: myth--one@163.com


Received: 28 April 2013   /Accepted: 19 July 2013   /Published: 31 July 2013

Digital Sensors and Sensor Sysstems


Abstract: With the wide application of computer and DCS in industry, the discrete controller has begun to play an important role in the process industry, thus leading internal model controller, which has good tracking performance, become the focus of the researchers' study [1]. Meanwhile, industrial field exists a large number of non-square multivariable systems, therefore it is significantly practical to study on non-square system. So this paper puts forward the design scheme of internal model controller, based on the discrete control system. At first, the paper presents the concept of discrete channel gain, and through discrete channels relative gain, square subsystem can be chose from non-square system. Then by using the square subsystem, the controller is designed. However, if the system is designed in this way, the control effect and the robustness of system will not be perfect. To solve this problem, we add a low pass filter based on the original control system. Through this way, the robustness and stability of the system will be increase.


Keywords: Discrete systems, Non-square multivariable system, Internal model control.


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