Abstract
In this article, an enhanced 2-degree-of-freedom internal model control strategy for typical industrial processes with time-delay is developed. For the proposed controller, it is composed of an inner loop feedback controller which is designed based on the internal model control theory and a weighted set-point tracking controller. Note that the adjustment of set-point tracking performance and disturbance rejection characteristics can be decoupled by employing the developed strategy, which indicates that more degrees of freedom are obtained for the proposed controller design; thus, better ensemble performance and stronger robustness are anticipated by regulating these two controllers separately, which may not be achieved in the conventional internal model control method. Case studies on two kinds of stable processes with time-delay verify the effectiveness of the proposed scheme finally.
Highlights
Because of the simple structure, convenient parameter setting and good stability, proportional–integral–derivative (PID) controller has been widely used in industrial processes.[1,2,3] In the past decades, there are lots of progresses on the theory and application of various advanced control technologies, which promotes the development of PID controllers to some extent.[4,5] As to the PID controller, its control parameters affect the corresponding closed-loop response greatly; the relevant tuning approaches are vital.[6]
The developed control strategy is tested on the first-order plus timedelay (FOPTD) and second order plus time-delay (SOPTD) processes, respectively, and the simulation results show that good set-point tracking performance and interference suppression characteristics are both achieved
In the new design approach, set-point tracking performance and disturbance rejection characteristics are expected simultaneously by adjusting different controllers separately, and the proposed controller is designed for the FOPTD process and the second-order plus time-delay (SOPTD) process, respectively
Summary
Because of the simple structure, convenient parameter setting and good stability, proportional–integral–derivative (PID) controller has been widely used in industrial processes.[1,2,3] In the past decades, there are lots of progresses on the theory and application of various advanced control technologies, which promotes the development of PID controllers to some extent.[4,5] As to the PID controller, its control parameters affect the corresponding closed-loop response greatly; the relevant tuning approaches are vital.[6]. In Shamsuzzoha and Lee,[16] the IMC-PID controller was designed to improve the disturbance rejection ability of the time-delay processes. As to the method in Liu et al.,[17] the corresponding setting is relatively simple, but good set-point tracking performance and disturbance rejection characteristics are hardly to be obtained simultaneously, because the two characteristics need to be traded off in the relevant controller design.
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