Hybrid fuzzy controllers for non-minimum phase systems

The class of non-minimum phase systems modeled by transfer functions with “unstable” zeros is considered as a controlled plant in control systems. The stabilization and control of this class of systems is difficult stabilizing because of the unusual behavior in both time and frequency domains. The paper shows that fuzzy control is a successful control solution for this class of systems. With this regard, the paper proposes two hybrid fuzzy controllers of Takagi-Sugeno type that cope with the class of second-order non-minimum phase systems with a “right half plane zero”.