Abstract
Wind energy is known as one of the most efficient clean renewable energy sources and has attracted extensive research interests in both academic and industry fields. In this study, the effects of turbulent wind and voltage disturbance on a wind turbine drivetrain are analyzed, and a wind turbine drivetrain dynamic model combined with the electric model of a doubly fed induction generator is established. The proposed model is able to account for the dynamic interaction between turbulent wind, voltage disturbance, and mechanical system. Also, the effects of time-varying meshing stiffness, transmission error, and bearing stiffness are included in the mechanical part of the coupled dynamic model. From the resultant model, system modes are computed. In addition, by considering the actual control strategies in the simulation process, the effects of turbulent wind and voltage disturbance on the geared rotor system are analyzed. The computational results show that the turbulent wind and voltage disturbance can cause adverse effects on the wind turbine drivetrain, especially the gearbox. A series of parametric studies are also performed to understand the influences of generator and gearbox parameters on the drivetrain system dynamics. Finally, the appropriate generator parameters having a positive effect on the gearbox in alleviating the extreme loads and the modeling approach for investigating the transient performance of generator are discussed.
Highlights
Today, with the rapid development of wind power generation technology, in order to guarantee a reliable and robust wind turbine generation system design, research on the interaction of different parts of a wind turbine in the presence of turbulent wind and voltage disturbance is warranted
The transmission is the most important component that can directly affect the safety and stability of the wind turbine. This geared rotor system is usually working under the coupled excitations of wind and electric loads as well as the internal excitation due to the gear transmission error and shaft dynamics
The doubly fed induction generator (DFIG) is controlled in the synchronous rotating d À q frame with attaching the dÀ axis to the stator flux
Summary
With the rapid development of wind power generation technology, in order to guarantee a reliable and robust wind turbine generation system design, research on the interaction of different parts of a wind turbine in the presence of turbulent wind and voltage disturbance is warranted. The transmission is the most important component that can directly affect the safety and stability of the wind turbine This geared rotor system is usually working under the coupled excitations of wind and electric loads as well as the internal excitation due to the gear transmission error and shaft dynamics. A dynamic model that combines all electrical, mechanical, and aerodynamic effects of a 1-MW wind turbine drivetrain is developed. The model consists of blades, a hub, a planet carrier, gears, a generator rotor, and elastic shafts. It considers the effects of the bending flexibility of the blades, meshing stiffness, meshing error, supporting stiffness, and shaft torsional stiffness. According to Newton’s second law of motion, the wind turbine dynamic system equations are described as:
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