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Enhanced automatic tuning procedure for process control of PI/PID controllers
Author(s) -
Tan K. K.,
Lee T. H.,
Wang Q. G.
Publication year - 1996
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690420916
Subject(s) - pid controller , control theory (sociology) , phase margin , transfer function , nyquist plot , process (computing) , relay , process control , step response , controller (irrigation) , computer science , nyquist–shannon sampling theorem , proportional control , margin (machine learning) , control system , control engineering , engineering , temperature control , control (management) , bandwidth (computing) , physics , artificial intelligence , dielectric spectroscopy , amplifier , computer network , operational amplifier , biology , operating system , power (physics) , quantum mechanics , machine learning , agronomy , electrochemistry , computer vision , electrode , electrical engineering
An enhanced automatic tuning procedure developed for process control of PI and PID controllers addresses several potential problems present in current standard autotuners. The proposed enhanced autotuner uses a novel technique based on relay feedback to estimate the process frequency response at two specified phase lags on the Nyquist curve automatically. An iterative procedure then uses these two points to obtain a transfer‐function model of the process. Based on this model and a controller‐selection scheme, an appropriate controller (PI or PID) is applied to the process automatically. The controller is tuned so that the Nyquist curve of the compensated system is appropriately shaped to satisfy a combined gain and phase‐margin type of specification. The effectiveness of this enhanced autotuner is demonstrated both in simulations and in real‐time experiments for level control of a coupled‐tanks system.