A wind energy generation replication method with wind shear and tower shadow effects. (March 2018)

• Record Type: Journal Article
• Authors: Fu, Lei; Wei, Yan-ding; Fang, Sheng; Tian, Geng; Zhou, Xiao-jun
• Is Part Of: Advances in mechanical engineering. Volume 10:Number 3(2018)
• Publication Date: 2018-03
• Subjects: Wind turbine simulator -- wind shear -- tower shadow -- computer order tracking; Mechanical engineering -- Periodicals; 621.05
• DOI: 10.1177/1687814018759216
• Languages: English
• ISSNs: 1687-8132

Abstract

Wind energy has become one of the most promising renewable energy in recent decades. However, severe rotor oscillations arose by the wind shear and tower shadow effects were not only harmful to the power quality but also threatening to the stability of the energy system. Meanwhile, it is difficult to simulate the effects under the local condition. Therefore, it is indispensable to develop an immersion environment for the wind energy conversion. To cover these requirements, a novel approach to simulate the process of the wind energy generation with wind shear and tower shadow effects is presented. In particular, the replication method is applicable to both fixed and variable speed turbines, for the rotor oscillations synchronizing with the rotations at a constant angle. The equivalent wind speed of the effects contributes to the aerodynamics model as nonstationary time series. For stationary processing the nonstationary signals in the time domain, the analysis of computer order tracking is imported to solve the spectral leakage in the fast Fourier transform spectrum. Finally, based on this method, an immersion environment is realized through two coupled induction motors in an electric closure test bed. Experimental results demonstrate that the proposed replication method is effective and accurate in terms of both static and dynamic performances.