Drivetrain load effects in a 5-MW bottom-fixed wind turbine under blade-pitch fault condition and emergency shutdown

The Science of Making Torque from Wind

Nejad, Amir Rasekhi^1 ; Jiang, Zhiyu^1 ; Gao, Zhen^1 ; Moan, Torgeir^1

Centre for Ships and Ocean Structures (CeSOS), Centre for Autonomous Marine Operations and Systems (AMOS), Department of Marine Technology, Norwegian University of Science and Technology (NTNU), Norway^1

关键词: Axial forces;    Decoupled analysis;    Emergency shutdown;    Fault conditions;    Fault event;    Load effects;    Main bearings;    Rotor torque;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/11/112011/pdf
DOI  :  10.1088/1742-6596/753/11/112011

来源: IOP

【 摘 要 】

In this paper, the effect of the blade-pitch fault and emergency shutdown on drivetrain responses in a 5-MW bottom-fixed wind turbine are investigated. A 5-MW reference gearbox with 4-point support is employed and the decoupled analysis approach is used for the load effect analysis. The effect of this fault event is then investigated for all bearings and gears inside the gearbox as well as main bearings. The results show that the blade-pitch fault creates significant axial forces on main bearings which increases the nontorque force entering the gearbox. Due to the emergency shutdown, the rotor torque reversal occurs which causes force reversals in gears. The main bearings are more affected than gears and bearings inside the gearbox in this fault condition and emergency shutdown, but first-stage bearings may also be considerably affected. It is therefore recommended to conduct a thorough inspection of main bearings and first stage bearings in case of such blade-pitch fault condition and emergency shutdown.