Abstract:In this study, an optimum seeking-based robust non-linear controller is proposed to maximise wind energy captured by variable speed wind turbines at low-to-medium wind speeds. The proposed strategy simultaneously controls the blade pitch angle and tip-speed ratio, through the turbine rotor angular speed, to an optimal point at which the power coefficient, and hence the wind turbine efficiency, is maximum. The optimal points are given to the controller by an optimisation algorithm that seeks the unknown optimal blade pitch angle and rotor speed. The control method allows for aerodynamic rotor power maximisation without exact knowledge of the wind turbine model. A representative numerical simulation is presented to show that the wind turbine can be accurately controlled to achieve maximum energy capture.
This paper proposes a control strategy to maximize the wind energy captured in a variable speed wind turbine, with an internal induction generator, at low to medium wind speeds. The proposed strategy controls the tip-speed ratio, via the rotor angular speed, to an optimum point at which the efficiency constant (or power coefficient) is maximum for a particular blade pitch angle and wind speed. This control method allows for aerodynamic rotor power maximization without exact wind turbine model knowledge. Representative numerical results demonstrate that the wind turbine can be controlled to achieve near maximum energy capture.
The automotive steering system plays an important role in determining the behavioral dynamics of the operator/vehicle interface. The system's primary function is to transmit the driver commanded steering wheel angle to the road wheels; The secondary function is to provide tire/road interface information back to the driver. The automotive chassis engineer needs a design tool to evaluate the effect of steering parameters on overall vehicle lateral behavior. In this paper, a real time steering simulator will be presented to emulate the behavior of automotive steering systems. The re-configurable steerby-wire simulator allows for the emulation of steering systems ranging from hydraulic, electric and steer-bywire in passenger, light duty, and commercial vehicles for pre-production and production models. To validate the simulator's functionality, a case study has been performed with numerical and experimental data. Comparisons between the simulator results and field data demonstrate a high level of correspondence. The re-configurable simulator evaluation tool represents a contribution to the field of automotive design.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.