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As is well known, control of industrial processes with significant dead time by using the conventional Smith Predictor (SP) results better performance in comparison to PI controllers. The SP has a main disadvantage which is a lack of robustness to variations in process parameters. To eliminate this deficiency, this paper presents the Robust Smith Predictor which is based on a modified disturbance...
This paper analyses one of the most important control system design issue, the controller performance. A blending process which can be modeled as First Order plus Dead Time is selected to design closed loop with PI and PID controllers. The tuning of the controller parameters have been done using Ziegler Nichols and Tyreus Luyben tuning techniques. The performance of the PI and PID controllers have...
A predictive PI controller is a simple but elegant reincarnation of a Smith predictor for low-order linear time-invariant processes with long dead times. Initially, the PPI was introduced for first-order plus dead time processes but it equally applies to integrating processes requiring no modifications to satisfy offset-free stationary control for load disturbances. Furthermore, the PPI controller...
This paper analyses the basic characteristic of digitally controlled ZCS-QRC synchronous buck converter, calculates the accurate value of on time, off time and dead times of switching MOSFETs, and puts forward an averaged switch model of the converter. In the digitally controlled system, the algorithm of online adaptive tuning digital PID regulator is used to obtain good dynamic performances. The...
Integrating process with dead time (IPDT) is one typical model for its widely existence in industrial processes. In terms of IPDT model, Modified Smith Predictor (MSP) and PID controller have been proposed to solve the problem. However, for different models, the convictive conclusion of performance comparison between the two schemes could not be obtained readily. In this paper, by using a time transformation,...
A control scheme is presented to achieve stabilization, satisfactory dynamic and steady state control performance for a general unstable process with dead time, where the rational function part of the process could be of non first order and the dead time of it larger than the upper bound for stabilization by PID control. The idea is to remove the stable lag part of the process by an internal model...
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