Dynamic Characteristics Analysis of Wind Turbine under Emergency Shutdown Events

doi:10.3901/JME.2019.05.082

Abstract

Abstract: The research is focused on the dynamic characteristics of wind turbine under emergency shutdown events caused by blade fault. Also the influence of blade parameters on wind turbine dynamic characteristics is discussed. The NREL 5-MW onshore wind turbine is studied. Simulink and FAST are used to develop the Aero-Servo-Elastic coupling dynamic model of wind turbine considering the flexibility of tower and blade, stochastic wind load as well as control strategy. The results show that, the tower-bottom suffer large impact load during emergency shutdown process, and the maximum bending moment of tower-bottom varies cyclically with the fault blade azimuth; When the wind turbine shutdown at different pitch rate, the duration of braking shortens gradually, and the loads on wind wheel and tower increase as the pitch rate increases. Compared with normal shutdown process, the nacelle vibration is intensified, and the main frequency components of nacelle's vibration acceleration are in accord with the first tower fore-aft natural bending frequency(0.326 Hz) and the first blade edgewise frequency(0.668 Hz); though the maximum bending moment of tower-bottom and the maximum of thrust are decreasing, the pitching moment of main shaft increases during emergency shutdown process.

Key words: dynamic characteristic, emergency shutdown, pitch system fault, wind turbine

CLC Number:

TH113

CHEN Xu, ZHU Caichao, SONG Chaosheng, TAN Jianjun, ZHU Yongchao. Dynamic Characteristics Analysis of Wind Turbine under Emergency Shutdown Events[J]. Journal of Mechanical Engineering, 2019, 55(5): 82-88.

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