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A Tuning of the Nonlinear PI Controller and Its Experimental Application
Koo, Doe Gyoon,Lee, Jie Tae,Lee, Dong Kwon,Han, Chong Hun,Gyu, Lyu Sung,Jung, Jae Hak,Lee, Moon Yong 한국화학공학회 2001 Korean Journal of Chemical Engineering Vol.18 No.4
Many industrial chemical process control systems consist of conventional PID and nonlinear controllers, even though many advanced control strategies have been proposed. In addition, nonlinear control methods are widely used even for linear processes to achieve better control per&onnance compared with linear PID controllers. However, there are few tuning methods for these nonlinear controllers. In this work, we suggest new controller tuning methods for the error square type of nonlinear PI controller. These control methods can be applied to a large number of linear and nonlinear processes without changing control structures. We also propose new tuning rules for integrating processes. In addition, we suggest application guidelines for performing the proposed tuning roles at the pilot scale multistage level control system. Finally, in this work we confirmed good control performances of the proposed tuning methods through both simulation studies and experimental studies.
Stability for Nonlinear Systems with Slowly Varying and Small Jump Inputs
Lee, Jietae,Koo, Doe-Gyoon,Park, Ho-Cheol Institute of Control 2002 Transaction on control, automation and systems eng Vol.4 No.1
Stability theorem for nonlinear systems with slowly varying inputs is extended to systems with slowly varying and small jump inputs.