Abstract
Aiming at the Megawatt (MW) scale wind turbine, a dynamic analysis and simulation method is presented to research blade loads and dynamic characteristics. To consider blade flexible deformation, the whole blade was divided into a number of units. Each unit was treated as a rigid body, the flexible connection between two adjacent units is considered. A nacelle coordinate system, a rotating shaft coordinate system, and a blade coordinate system were employed to describe the wind turbine blade. In those coordinate systems, blade inertial load calculation model, centrifugal force load calculation model and gravity load calculation model are established. Combining load model with the whole model of wind turbines, the real-time dynamic simulation model of blade loads was established in Simulink circumstance and a numerical simulation was performed. Based on the simulation analysis, some research results were obtained. When the large instantaneous fluctuation of electromagnetic torque of generator happens, rotor speed does not appear to have large fluctuation due to the inertia of the wind rotor, but the blade vibration speed changes obviously. Gravity has a periodic variation in the process of blade rotation and has a large influence on the edgewise moment. The research results provide a helpful reference for the structure design, operation, and control of wind turbines.
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Recommended by Associate Editor Sungsoo Na
Juchuan Dai received his Ph.D. from Central South University (China) in 2011 and is a Visiting Scholar at Newcastle University (UK) in 2016. He is currently an Associate Professor at Hunan university of Science and Technology in China.
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Dai, J., Hu, W. & Shen, X. Load and dynamic characteristic analysis of wind turbine flexible blades. J Mech Sci Technol 31, 1569–1580 (2017). https://doi.org/10.1007/s12206-017-0304-0
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DOI: https://doi.org/10.1007/s12206-017-0304-0