Support structure strength assessment based on aeroservoelastic modelling of an Arctic wind turbine

Introduction. Wind energy plays a key role in the development of renewable energy sources, especially in remote areas of the Arctic with autonomous power systems. Ensuring the reliability and durability of wind turbine supporting structures in the Arctic zone of the Russian Federation is an important scientific and technical task. Unique climatic conditions including low temperature, strong wind loads, snow and icing considerably complicate the design of such facilities. The purpose of the study is to develop a comprehensive methodology of aeroservoelastic modelling of wind turbines to assess the load-bearing capacity of supporting structures and to optimize the load-bearing structural system of wind turbines.

Materials and methods. A 100 kW wind turbine with a height of 30 is considered as an example. Blade element momentum analysis and aeroservoelastic modelling in the QBlade software are used, and the finite-element software FEA NX is used to calculate the stress-strain state of the supporting structural system. The design wind turbine operation modes with different wind and icing conditions are considered. Modelling covers normal and extreme modes, including analysis of dynamic loads and the influence of resonance effects.

Results. A methodology of aeroservoelastic modelling has been developed, which makes it possible to consider complex operational and climatic effects on the elements of wind turbines. The loads on the wind turbine elements in different operating modes and with rotor icing are determined, their extreme combinations are revealed. Strength and stability analysis of support structures is performed. Structural measures are proposed to increase structural system load-bearing capacity. Recommendations on further optimization of wind turbine design for operation in the Arctic conditions are prepared.

Conclusions. The methodology allows considering the climatic factors of the Arctic to assess the load-bearing capacity of wind turbine support structures. The results obtained can be used in the design of S-class Arctic wind turbines, as well as in the development of methodological recommendations for the calculation of wind turbines, to improve the reliability and efficiency of wind turbine designs used in the Arctic zone of the Russian Federation.

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