Dynamic Load Analysis of Tower Structure of Floating Wind Turbine Under Random Wind and Wave Excitation

2021 ◽  
Author(s):  
SHILUN ZHAO
Keyword(s):  
Wind Turbine ◽  
Dynamic Load ◽  
Wave Excitation ◽  
Floating Wind Turbine ◽  
Tower Structure ◽  
Load Analysis

Dynamic Load Analysis of the Tower Structure of a Floating Wind Turbine Under Random Wind and Wave Excitation by Detuning Blade Pitch Controller Proportional Gains

2020 ◽  
Author(s):  
Zhao Shilun
Keyword(s):  
Wind Turbine ◽  
Dynamic Load ◽  
Gain Coefficient ◽  
Sea State ◽  
Wind Speeds ◽  
Floating Wind Turbine ◽  
Tower Structure ◽  
Load Effects ◽  
Motion Performance ◽  
Base Connections

Abstract This paper carried out coupled non-linear aero-hydro-servo-elastic simulations of a semisubmersible floating wind turbine under normal and severe sea states at various wind speeds. The NREL 5MW turbine was modeled by the SIMO-RIFLEX module in SESAM with hydrodynamic gathered by the WADAM code. A taut leg mooring system with redundancy was applied to account for the relatively shallow water site in the South China Sea. By detuning KP, the proportional gain coefficient of the blade-pitch controller, the platform motions and dynamic load effects on tower structure were investigated. It was found that the reduction of KP mitigates the load effects on tower top and base connections in certain load conditions. The motion performance of the platform was improved to some extent. The generator power output, as well as the fluctuation, were analyzed. Finally, suggestion on detailed blade pitch gains tuning according to specific wind speed and sea state was given.

Numerical Modelling and Analysis of a Hybrid-Spar Floating Wind Turbine

2017 ◽  
Author(s):  
Tomoaki Utsunomiya ◽  
Iku Sato ◽  
Osamu Kobayashi ◽  
Takashi Shiraishi ◽  
Takashi Harada
Keyword(s):  
Numerical Modelling ◽  
Wind Turbine ◽  
Prestressed Concrete ◽  
Analysis Model ◽  
Design Load ◽  
Floating Wind Turbine ◽  
Load Analysis ◽  
Precast Prestressed Concrete ◽  
Numerical Modelling And Analysis ◽  
Nagasaki Prefecture

In this paper, numerical modelling and analysis of a hybrid-spar floating wind turbine is presented. The hybrid-spar consists of steel at the upper part and the precast prestressed concrete (PC) at the lower part. Such a configuration is referred to as a hybrid-spar in this paper. The hybrid spar was successfully installed offshore of Kabashima Island, Goto city, Nagasaki prefecture, Japan on October 18, 2013 (see OMAE2015-41544 [1] for details). In this paper, some details on numerical modelling of the hybrid-spar for design load analysis are presented. Then, the validation of the numerical analysis model is presented for a full-scale hybrid-spar model with 2-MW wind turbine.

508 Dynamic Load Analysis for Wind Turbine using FAST/CFD(1)

2006 ◽  
Vol 2006 (0) ◽  
pp. _508-a_
Author(s):  
Makoto IIDA ◽  
Hiroaki FUJIO ◽  
Chuichi ARAKAWA
Keyword(s):  
Wind Turbine ◽  
Dynamic Load ◽  
Load Analysis

Analysis on Hydrodynamic Responses of a Spar Offshore Wind Turbine With an Innovative Type of Mooring System

2019 ◽  
Author(s):  
Yuan Ma ◽  
Chaohe Chen ◽  
Xinkuan Yan ◽  
Yijun Shen ◽  
Tianhui Fan
Keyword(s):  
Wind Turbine ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Mooring System ◽  
Control Performance ◽  
Floating Platform ◽  
Generation Efficiency ◽  
Floating Wind Turbine ◽  
Tower Structure ◽  
Original Type

Abstract The mooring system is a key component connecting a floating offshore wind turbine (FOWT) to the seabed. Generally, the traditional mooring systems mainly control the horizontal motions of the floating platform. However, due to the existence of blades, tower structure and the requirement of power generation efficiency, there is a high requirement on the pitching performance when a platform is used for the floating wind turbine. Therefore, an innovative type of mooring system which could improve the pitch performance of the FOWT is really needed. In this paper, considering the OC3-Hywind Spar floating wind turbine, based on the original type of 3 × 3 mooring system, an innovative type of mooring system which has a better control performance of the pitch of FOWT is designed. Then, the hydrodynamic responses of the floating wind turbine platform are investigated. The influence of two different mooring system types on the hydrodynamic responses of the FOWT are compared and analyzed. The conclusions of this study could serve as a reference for the mooring system design of floating wind turbine systems.

scholarly journals Model-based design of a wave-feedforward control strategy in floating wind turbines

2021 ◽  
Author(s):  
Alessandro Fontanella ◽  
Mees Al ◽  
Jan-Willem van Wingerden ◽  
Marco Belloli
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Control Strategy ◽  
Feedforward Control ◽  
Effective Control ◽  
Control Input ◽  
Wave Excitation ◽  
Rotor Speed ◽  
Floating Wind Turbine ◽  
Fatigue Loads

Abstract. Floating wind turbines rely on feedback-only control strategies to mitigate the effects of wave excitation. Improved power generation and lower fatigue loads can be achieved by including information about the incoming waves into the wind turbine controller. In this paper, a wave-feedforward control strategy is developed and implemented in a 10 MW floating wind turbine. A linear model of the floating wind turbine is established and utilized to show how wave excitation affects the wind turbine rotor speed output, and that collective-pitch is an effective control input to reject the wave disturbance. Based on the inversion of the same model, a feedforward controller is designed, and its performance is examined by means of linear analysis. A gain-scheduling algorithm is proposed to adapt the feedforward action as the wind speed changes. Non-linear time-domain simulations prove that the proposed feedforward control strategy is an effective way of reducing rotor speed oscillations and structural fatigue loads caused by waves.

508 Dynamic Load Analysis for Wind Turbine using FAST/CFD(2)

2006 ◽  
Vol 2006 (0) ◽  
pp. _508-1_-_508-4_
Author(s):  
Makoto IIDA ◽  
Hiroaki FUJIO ◽  
Chuichi ARAKAWA
Keyword(s):  
Wind Turbine ◽  
Dynamic Load ◽  
Load Analysis

scholarly journals Model-based design of a wave-feedforward control strategy in floating wind turbines

2021 ◽  
Vol 6 (3) ◽  
pp. 885-901
Author(s):  
Alessandro Fontanella ◽  
Mees Al ◽  
Jan-Willem van Wingerden ◽  
Marco Belloli
Keyword(s):  
Wind Turbine ◽  
Linear Model ◽  
Wind Turbines ◽  
Control Strategy ◽  
Feedforward Control ◽  
Linear Time ◽  
Scheduling Algorithm ◽  
Wave Excitation ◽  
Floating Wind Turbine ◽  
Feedforward Controller

Abstract. Floating wind turbines rely on feedback-only control strategies to mitigate the negative effects of wave excitation. Improved power generation and lower fatigue loads can be achieved by including information about incoming waves in the turbine controller. In this paper, a wave-feedforward control strategy is developed and implemented in a 10 MW floating wind turbine. A linear model of the floating wind turbine is established and utilized to understand how wave excitation affects rotor speed and so power, as well as to show that collective pitch is suitable for reducing the effects of wave excitation. A feedforward controller is designed based on the inversion of the linear model, and a gain-scheduling algorithm is proposed to adapt the feedforward action as wind speed changes. The performance of the novel wave-feedforward controller is examined first by means of linear analysis and then with non-linear time-domain simulations in FAST. This paper proves that including some information about incoming waves in the turbine controller can play a crucial role in improving power quality and the turbine fatigue life. In particular, the proposed wave-feedforward control strategy achieves this goal complementing the industry-standard feedback pitch controller. Together with the wave-feedforward control strategy, this paper provides some insights about the response of floating wind turbines to collective-pitch control and waves, which could be useful in future control-design studies.

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