Parametric Wave Excitation Model for Floating Wind Turbines

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• 作者：Frank Lemmer (né ; Sandner) ; ^{lemmer@ifb.uni-stuttgart.de" class="auth_mail" title="E-mail the corresponding author} ; Steffen Raach ; David Schlipf ; Po Wen Cheng
• 关键词：Floating wind turbine ; wave excitation model ; disturbance model ; system identification ; LTI model ; controller design
• 刊名：Energy Procedia
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：94
• 期：Complete
• 页码：290-305
• 全文大小：791 K

文摘

This paper presents a parametric wave disturbance model for an improved representation of the overall system dynamics of a floating wind turbine (FOWT). Hydrodynamic panel codes calculate the frequency-dependent first-order wave excitation force coefficient on rigid floating bodies. This transfer function from wave height to the forces and moments on the body is approximated in this work by a linear time-invariant model. With a causal problem definition the fit to an impulse response shows a good agreement in frequency and time domain for spar-type and semi-submersible-type platforms of floating wind turbines. The disturbance model was coupled to a linear structural FOWT model and the effect of the wave height on the tower-top displacement was compared to the nonlinear model with good agreement. Applications of this parametric model are the inclusion of disturbance dynamics in model-based controller design as well as feedforward control for fatigue load reduction.