Open AccessPerformance evaluation of two degree of freedom conventional controller adopting the smith principle for first order process with dead time
Author(s) -
Belinda Sharon Bright,
R. Swarnalatha
Publication year - 2019
Publication title -
international journal of electrical and computer engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.277
H-Index - 22
ISSN - 2088-8708
DOI - 10.11591/ijece.v9i4.pp3002-3014
Subject(s) - dead time , smith predictor , control theory (sociology) , robustness (evolution) , matlab , computer science , controller (irrigation) , process (computing) , pid controller , control (management) , mathematics , control engineering , temperature control , engineering , artificial intelligence , agronomy , statistics , biochemistry , chemistry , biology , gene , operating system
The Proportional Integral Derivative Controller is a typical controller implemented frequently in many services and integrating the Smith predictor is an extremely useful control system structure for processes with dead time. This paper has evaluated two control schemes with the modified structures of the Smith predictor incorporating dead time compensators and conventional controllers for first order process with dead time. The disturbance response and the set point response for both the control schemes were decoupled from each other. Therefore two degrees of freedom control design was formulated, and hence the responses could be designed separately. The two control schemes have mainly two variables to be adjusted that decide the robustness and closed-loop behaviour. This paper also contains the calculation of various parameters that were used in each scheme. A comparison of the two control schemes along with the general Smith predictor control scheme was made using Simulink/Matlab. The conclusion is the second control scheme gave better response overall for the processes with dead time having dead time uncertainty and for the processes with dead time without dead time uncertainty.