Boundary vibration control of a floating wind turbine system with mooring lines

Abstract

In this paper, we investigate dynamic modeling, active boundary control design, and stability analysis for a coupled floating wind turbine (FWT) system, which is connected with two flexible mooring lines. It is a coupled beam-strings structure, and we design two boundary controllers to restrain the vibrations of this flexible system caused by external disturbances based on the coupled partial differential equations and ordinary differential equations (PDEs-ODEs) model. Meanwhile, significant performance of designed boundary controllers and system's stability are theoretically analyzed, and a set of simulation results are provided to show efficacy of the proposed approach.

Adaptive fuzzy constraint control for switched nonlinear systems in nonstrict feedback form

“…For this kind of uncertainties, there are mainly two effective methods: control method based on fuzzy logic systems 34‐37 and control method based on neural networks 38‐42 . Abundant research results have been obtained for these two methods 43‐51 . For example, an adaptive tracking control problem was studied for an uncertain nonlinear system with input quantisation in Reference 42, and the neural networks were used to approximated unknown terms.…”