Coupled Hydro-Aero-Servo Dynamic Response Analysis of Floating Wind Turbines Based on Frequency-Domain Method

doi:10.16183/j.cnki.jsjtu.2024.251

Abstract

Abstract:

The time-domain calculation method for the dynamic response of floating wind turbines under the combined action of wind, waves, and flow has been extensively researched and developed. However, due to its low computational efficiency, substantial computational resources are required when applying this method to optimize the layout of units in a floating wind farm and to optimize the preliminary design of floating wind turbines and mooring systems. Therefore, this paper focuses on the frequency-domain analysis method enabling rapid calculation of the dynamic response of floating wind turbines. It comprehensively considers various environmental load factors, including first- and second-order wave loads, pulsating wind loads on the turbine, slender member viscous loads, mooring systems, and wind turbine pitch control strategies. For different operating conditions such as below-rated operation, pitch operation, and shutdown, the results obtained from the frequency-domain method were compared and analyzed with the time-domain prediction results from OrcaFlex software. Both methods show good consistency in terms of steady-state response, dynamic response spectra, and statistical values, thus validating the applicability and accuracy of the frequency-domain analysis method in providing reliable reference value for the preliminary design and parameter sensitivity analysis of floating wind turbines. Furthermore, based on the frequency-domain method, the influence of wind-wave parameters, second-order wave forces, and the implementation of wind turbine control strategies on the dynamic response characteristics of floating wind turbines was studied.

Key words: floating wind turbine, frequency-domain method, load linearization, dynamic response, second-order wave forces

CLC Number:

P751

JING Jionglin, XU Yuwang, YANG Zhou, SONG Bin, ZHANG Mengmeng, REN Haojie. Coupled Hydro-Aero-Servo Dynamic Response Analysis of Floating Wind Turbines Based on Frequency-Domain Method[J]. Journal of Shanghai Jiao Tong University, 2026, 60(3): 364-376.

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参数	设计值	参数	设计值
功率/MW	5	悬垂/m,仰角/(°),锥角/(°)	5,5,2.5
机型	三叶片迎风式	齿轮箱减速比	97: 1
叶片直径/m,轮毂直径/m	126,3	切入,额定,切出风速/(m·s^-1)	3,11.4,25
轮毂高度/m	90	叶片质量/kg	110 000
塔架高度/m	87.6	机舱质量/kg	240 000
塔架底端直径/m	6	塔筒质量/kg	347 460
塔架顶端直径/m	3.87	风轮额定推力/kN	712.4

参数	设计值	参数	设计值
平台吃水/m	20	斜撑直径/m	1.6
中浮筒直径/m	6.5	侧浮筒中心距/m	50
中浮筒高度/m	32	平台总质量/kg	1.347 3×10⁷
侧底部浮筒直径/m	24	平台质心高度/m	-13.46
侧底部浮筒高度/m	6	横摇转动惯量/(kg·m²)	6.827×10⁹
侧上部浮筒直径/m	12	纵摇转动惯量/(kg·m²)	6.827×10⁹
侧上部浮筒高度/m	26	艏摇转动惯量/(kg·m²)	1.226×10⁷

工况号	工况	H_s/m	T_p/s	v/(m·s^-1)	浮式风力机状态
C1	额定海况无风	1.86	8.98	—	停机
C2	风浪同向	1.86	8.98	16	运行、不变桨
C3	风浪同向	1.86	8.98	16	运行、变桨
C4	停机	7.3	12	46.2	停机、顺桨

工况号	纵荡/m		垂荡/m		纵摇/(°)
工况号	频域	时域	频域	时域	频域	时域
C1	0.22	0.24	-0.06	-0.06	0.01	0.01
C2	5.06	5.30	-0.08	-0.09	1.84	2.05
C3	5.11	6.17	-0.08	-0.09	1.87	2.06
C4	1.42	1.44	-0.06	-0.06	0.01	0.01

工况号	纵荡/m		垂荡/m		纵摇/(°)
工况号	频域	时域	频域	时域	频域	时域
C1	0.301	0.337	0.060 0	0.057 8	0.130	0.122
C2	6.27	6.55	0.060 5	0.063 7	1.39	1.88
C3	2.89	3.16	0.060 1	0.060 3	1.14	1.43
C4	1.91	1.80	0.469	0.448	5.91	5.44