Coupled dynamic response analysis of multi-column floating offshore wind turbine with low center of gravity

doi:10.1016/j.joes.2022.07.004

Abstract

Abstract:

To realize the application of the floating offshore wind turbine (FOWT) from deep to relatively shallow waters, a new concept of multi-column floating wind turbine platform with low center of gravity (CG) is designed and validated. The multi-column low CG platform is designed to support a 6MW wind turbine class and operated at a water depth of 50m in the South China Sea. The frequency domain software WADAM and time domain software NREL-FAST are used to simulate coupled dynamic responses of the floating wind turbine system with second-order wave loads considering. The dynamic behaviors of multi-column low CG FOWT system under normal operation and parked conditions are presented. The influence of second-order wave force on the motion responses of the multi-column platform, fore-aft force and moment of the tower base and mooring force are researched respectively. The results demonstrate that the coupled dynamic responses at rated operating condition and extreme condition meet the normal operating requirements and extreme survival requirements of FOWT system in the shallow water (50m) of South China Sea. In addition, it is found that, the wave frequency response gradually replaces the second-order low frequency response as the main influencing factor of the coupled dynamic response of the FOWT system with the increasing severity of the sea states. However, in general, the magnitude of second-order low frequency response increases with the increasing severity of the design load case. Thus, in the subsequent design of the shallow water FOWT system, the second-order effects should be paid enough attention.

Key words: Floating offshore wind turbine, Multi-column platform, Second-order wave force, Concept design, Coupled dynamic response

Jie Yang, Yan-ping He, Yong-sheng Zhao, Xiao-yan Yang, Guo-rong Zhang. Coupled dynamic response analysis of multi-column floating offshore wind turbine with low center of gravity[J]. Journal of Ocean Engineering and Science, 2024, 9(1): 25-39.

Jie Yang, Yan-ping He, Yong-sheng Zhao, Xiao-yan Yang, Guo-rong Zhang. [J]. Journal of Ocean Engineering and Science, 2024, 9(1): 25-39.

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URL: https://www.qk.sjtu.edu.cn/joes/EN/10.1016/j.joes.2022.07.004

https://www.qk.sjtu.edu.cn/joes/EN/Y2024/V9/I1/25

Figures/Tables 24

References 33

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Type	Barge	Semi-Submersible	TLP	SPAR
Schematic diagram
Mechanism of obtaining stability	Large waterplane area	Multiple small waterplane area with large intervals	Multiple pre-tensioned legs with large intervals	Deep draft and CG below CB
Water depth suitability	Operable at depths starting 30 m	Depth independence	Having a good water-depth flexibility	Deep drafts and large seabed footprint
Suitability of mooring system for shallow water	Demanding more robust mooring systems	Cheap and simple mooring system	Complex and costly mooring system	Cheap and simple mooring system

Type	Barge	Semi-Submersible	TLP	SPAR
Schematic diagram
Mechanism of obtaining stability	Large waterplane area	Multiple small waterplane area with large intervals	Multiple pre-tensioned legs with large intervals	Deep draft and CG below CB
Water depth suitability	Operable at depths starting 30 m	Depth independence	Having a good water-depth flexibility	Deep drafts and large seabed footprint
Suitability of mooring system for shallow water	Demanding more robust mooring systems	Cheap and simple mooring system	Complex and costly mooring system	Cheap and simple mooring system

Wind turbine	Unit	Value
Rated power	MW	6
Rotor orientation		Upwind,3 Blades
Blade length	m	78
Hub radius	m	2.35
Hub center height	m	100
Cut-in, Rated, Cut-out Wind Speed	m/s	3,10.5,25
Rated rotor speed	rpm	10
Blade mass	kg	29196
Tower mass	kg	409822.7
Nacelle mass + rotor mass	kg	230000

Wind turbine	Unit	Value
Rated power	MW	6
Rotor orientation		Upwind,3 Blades
Blade length	m	78
Hub radius	m	2.35
Hub center height	m	100
Cut-in, Rated, Cut-out Wind Speed	m/s	3,10.5,25
Rated rotor speed	rpm	10
Blade mass	kg	29196
Tower mass	kg	409822.7
Nacelle mass + rotor mass	kg	230000

Platform	Unit	Value
Design water depth	m	50
Design draft	m	35
Platform mass with ballast	ton	11554.7
Displacement	m³	12181.5
Density of ballast	Ton/m³	4
Platform CG below the SWL (including ballast)	m	29.7
Platform CB below the SWL	m	18.6
Diameter of main column	m	8
Length of main column	m	38
Diameter of offset columns	m	10
Length of offset columns	m	35
Diameter of base columns	m	16
Length of base columns	m	5
Diameter of cross braces	m	5
Length of cross braces	m	16
Diameter of pontoons	m	1.6
Length of pontoons(upper/footing)	m	17/27
Platform roll inertia about the CM	kgm²	1.3E10
Platform pitch inertia about the CM	kgm²	1.3E10
Platform yaw inertia about the CM	kgm²	7.1E09

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