Development of some fuzzy controllers with non-homogenous dynamics with respect to the input channels meant for a class of systems

Abstract

The paper presents a systematical development method for four fuzzy controllers with non-homogenous dynamics with respect to the two input channels; the proposed controller structures are meant for a class of second order and third order plants, which is specific to the field of electrical drives. The electrical drives are characterized by standard models for which even the classical (linear) control structures give satisfaction [ast95]. The design relations result on the basis of the fact that fuzzy controllers can be, in some certain conditions, well approximated by linear controllers and, so, the Extended Symmetrical Optimum method [pre96] is applicable in this situation. A detailed analysis based on digital simulation results proves that the proposed fuzzy controllers can ensure better control system performance with respect to the reference input in comparison with other structures containing conventional controllers.