Fuzzy control solution for hydro turbine generators

The paper proposes a fuzzy control solution based on a new Takagi-Sugeno fuzzy controller (TS-FC) dedicated to speed control of hydro turbine generators, where the plant is nonminimum phase systems. In the first phase PI controllers are developed ensuring desired maximum values both for the sensitivity function (s.f.) and for the complementary s.f. in frequency domain. Accepting the approximate equivalence between fuzzy controllers and the linear ones in certain conditions, an attractive design method for a four inputs-two outputs TS-FC is offered. The fuzzy control system guarantees maximum imposed s.f.s and therefore good responses with respect to modifications of reference and disturbance inputs, and robustness with respect to model uncertainties. The proposed solution has been validated through simulation of a real-world case study. The controller is compared with two PI controllers designed separately with respect to the reference input and to one of the disturbance inputs.