Abstract
The present work aims at assessing the reliability of a simulation tool capable of computing the unsteady rotational motion and the associated tower oscillations of a variable speed VAWT immersed in a coherent turbulent wind. As a matter of fact, since the dynamic behaviour of a variable speed turbine strongly depends on unsteady wind conditions (wind gusts), a steady state approach can't accurately catch transient correlated issues.The simulation platform proposed here is implemented using a lumped mass approach: the drive train is described by resorting to both the polar inertia and the angular position of rotating parts, also considering their speed and acceleration, while rotor aerodynamic is based on steady experimental curves. The ultimate objective of the presented numerical platform is the simulation of transient phenomena, driven by turbulence, occurring during rotor operation, with the aim of supporting the implementation of efficient and robust control algorithms.
Highlights
The dynamic response of a rotor subjected to a turbulent flow is of the utmost importance in the mechanical design process as well as for the development of efficient control strategies
Static performance validation This first validation step helps assessing the reliability of two vertical axis wind turbine (VAWT)-DP modules: the rotor aerodynamic module and the control module
Vertical Axis Wind Turbines Dynamic Predictor (VAWT-DP) was verified for various operating conditions: almost steady wind, wind drops, gusts and different turbulence levels, by feeding to the model wind time series collected during open field tests
Summary
The dynamic response of a rotor subjected to a turbulent flow is of the utmost importance in the mechanical design process as well as for the development of efficient control strategies. Stochastic dynamic response analyses of floating VAWTs, based on fully coupled non-linear time domain simulations, have recently been undertaken with the aim of harvesting the potential of offshore wind resources in moderate and deep water [1]. DTU developed an aeroelastic commercial code, based on the cylinder actuator theory [3], capable of predicting dynamic loads and performances of multi-MW floating VAWTs. This work proposes a simplified approach to investigate the dynamic behavior (rotation and displacements) and the effect of control strategies on small variable speed VAWTs. This work proposes a simplified approach to investigate the dynamic behavior (rotation and displacements) and the effect of control strategies on small variable speed VAWTs
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