An optimal fuzzy PID controller
Tang, K.S.; Kim Fung Man; Guanrong Chen; Kwong, S.
Industrial Electronics, IEEE Transactions on
Volume 48, Issue 4, Aug 2001 Page(s):757 - 765
Digital Object Identifier   10.1109/41.937407
Summary:This paper introduces an optimal fuzzy proportional-integral-derivative (PID) controller. The fuzzy PID controller is a discrete-time version of the conventional PID controller, which preserves the same linear structure of the proportional, integral, and derivative parts but has constant coefficient yet self-tuned control gains. Fuzzy logic is employed only for the design; the resulting controller does not need to execute any fuzzy rule base, and is actually a conventional PID controller with analytical formulae. The main improvement is in endowing the classical controller with a certain adaptive control capability. The constant PID control gains are optimized by using the multiobjective genetic algorithm (MOGA), thereby yielding an optimal fuzzy PID controller. Computer simulations are shown to demonstrate its improvement over the fuzzy PID controller without MOGA optimization

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