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research-article

Modeling of a Wind Turbine Rotor Blade System

[+] Author and Article Information
Dayuan Ju

Department of Mechanical and Manufacturing Engineering, University of Calgary 2500 University Dr NW, Calgary, AB, Canada, T2N 1N4
dju@ucalgary.ca

Qiao Sun

Department of Mechanical and Manufacturing Engineering, University of Calgary 2500 University Dr NW, Calgary, AB, Canada, T2N 1N4
qsun@ucalgary.ca

1Corresponding author.

ASME doi:10.1115/1.4036633 History: Received November 05, 2016; Revised April 18, 2017

Abstract

In wind turbine blade modeling, the coupling between rotor rotational motion and blade vibration has not been thoroughly investigated. The inclusion of the coupling terms in the wind turbine dynamics equations helps us understand the phenomenon of rotor oscillation due to blade vibration and possibly fault diagnosis. In this study, a dynamics model of a rotor blade system for a horizontal axis wind turbine which describes the coupling terms between the blade elastic movement and rotor gross rotation is developed. This model captures two-way interactions between aerodynamic wind flow and structural response. On the aerodynamic side, both steady and unsteady wind flow conditions are considered. On the structural side, blades are considered to deflect in both flap and edge directions while the rotor is treated as a rigid body. The developed model is cross-validated against a model developed in the simulation software FAST (Fatigue, Aerodynamics, Structure, and Turbulence). The coupling effects are excluded during the comparison since FAST does not include these terms. Once verified, we added coupling terms to our model to investigate the effects of blade vibration on rotor movement which has direct influences on the generator behavior. The significance of the coupling terms in applications such as blade fault detection is discussed. It is illustrated that the inclusion of coupling effects can increase the sensitivity of detecting blade faults. The proposed model can be used to investigate the effects of different terms as well as analyze fluid structure interaction.

Copyright (c) 2017 by ASME
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