Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/71689
Title: Robust self-tuning PID controller for nonlinear systems
Authors: Tan, K.K. 
Huang, S. 
Ferdous, R.
Issue Date: 2001
Source: Tan, K.K.,Huang, S.,Ferdous, R. (2001). Robust self-tuning PID controller for nonlinear systems. IECON Proceedings (Industrial Electronics Conference) 3 : 758-763. ScholarBank@NUS Repository.
Abstract: In this paper, we propose a robust self-tuning PID controller suitable for nonlinear systems. The control system employs a preload relay (P_Relay) in series with a PID controller. The P_Relay ensures a high gain to yield a robust performance. However, it also incurs a chattering phenomenon. In this paper, instead of viewing the chattering as an undesirable yet inevitable feature, we use it as a naturally occurring signal for tuning and re-tuning the PID controller as the operating regime digresses. No other explicit input signal is required. Once the PID controller is tuned for a particular operating point, the relay may be disabled and chattering ceases correspondingly. However, it is invoked when there is a change is setpoint to another operating regime. In this way, the approach is also applicable to time-varying systems as the PID tuning can be continuous, based on the latest set of chattering characteristics. Simulation results for the level control of fluid in a spherical tank using the scheme are also presented.
Source Title: IECON Proceedings (Industrial Electronics Conference)
URI: http://scholarbank.nus.edu.sg/handle/10635/71689
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