Transient response analysis of tension-leg-platformfloating offshore wind turbine under tendon failure conditions

doi:10.3785/j.issn.1008-973X.2020.11.015

Journal of ZheJiang University (Engineering Science)

2020, Vol. 54

Issue (11): 2196-2203 DOI: 10.3785/j.issn.1008-973X.2020.11.015

Transient response analysis of tension-leg-platformfloating offshore wind turbine under tendon failure conditions

Hao-yu WU1,2,3(

),Yong-sheng ZHAO1,2,3,Yan-ping HE1,2,3,*(

),Wen-gang MAO4,Jie YANG1,2,3,Xiao-li GU1,2,3,Chao HUANG1,2,3

1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China
3. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
4. Department of Mechanics and Maritime Sciences, Chalmers University of Technology, Gothenburg SE-41296, Sweden

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Abstract

The mooring load calculation module of the fully coupled dynamic simulation software FAST was recompiled, and the transient response of a tension-leg-platform floating offshore wind turbine (FOWT) named WindStar TLP system under tendon failure was numerically simulated using a time domain method, in terms of the coupled system of wind turbine, tension-leg-type support platform and tendons. The transient response of the key parameters, i.e., platform motions, nacelle accelerations and tensions in the remaining tendons under different wave directions in 50-year extreme condition were investigated. Results show that the transient response of platform motions, nacelle accelerations and tendon tensions under tendon failure are significant. The transient response of FOWT with the broken tendon in back waves is greater than that with the broken tendon in head waves. And when the broken tendon in back waves is aligned with the wave, the transient response of FOWT is the maximum. The safety factor for tendon system under tendon failure in 50-year extreme condition meets the requirements of specification constituted by American Bureau of Shipping (ABS), which verifies the survivability of this tension-leg-type FOWT.

Key words： floating offshore wind turbines tension-leg platform tendon failure transient response time domain analysis

Received: 22 November 2019 Published: 15 December 2020

CLC:	P 753
	TM 614

Corresponding Authors: Yan-ping HE E-mail: haoyuwu@sjtu.edu.cn;hyp110@sjtu.edu.cn

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	Hao-yu WU
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	Jie YANG
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Cite this article:

Hao-yu WU,Yong-sheng ZHAO,Yan-ping HE,Wen-gang MAO,Jie YANG,Xiao-li GU,Chao HUANG. Transient response analysis of tension-leg-platformfloating offshore wind turbine under tendon failure conditions. Journal of ZheJiang University (Engineering Science), 2020, 54(11): 2196-2203.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2020.11.015 OR http://www.zjujournals.com/eng/Y2020/V54/I11/2196

张力腿浮式风机筋腱失效模式下瞬态响应分析

针对风力机-张力腿型支撑平台-筋腱耦合系统，对全耦合动力学仿真软件FAST的系泊载荷计算模块进行二次开发，采用时域分析方法对张力腿浮式风机（FOWT）WindStar TLP system筋腱失效模式下的瞬态响应进行数值仿真分析. 重点研究50 a一遇海况中不同浪向下的浮式风力机支撑平台运动、机舱加速度和筋腱张力等关键参数的瞬态响应. 结果表明：在该工况下支撑平台运动、机舱加速度、筋腱张力的瞬态响应较显著；失效筋腱位于背浪侧时的浮式风力机瞬态响应大于失效筋腱位于迎浪侧时的浮式风力机瞬态响应，当位于背浪侧的失效筋腱与波浪共线时，浮式风力机瞬态响应最大；在极端海况中筋腱失效模式下的筋腱系统安全系数符合美国船级社规范要求，表明该张力腿型浮式风力机具备较好的自存性.

关键词： 海上浮式风力机, 张力腿平台, 筋腱失效, 瞬态响应, 时域分析

Fig.1 Illustration of multi-column TLP floating wind turbine

Tab.1 Main parameters of multi-column TLP floating wind turbine

Fig.2 Elastic rod model

Fig.3 Simulation flowchart of tendon failure

Tab.2 Definition of tendon failure cases

Fig.4 Schematic diagram of directions of wind and wave

Tab.3 Natural motion periods of multi-column TLP floating wind turbine

Fig.5 Power spectral density of pitch under tendon failure in still water

Fig.6 Pitch time series under wave direction of 180°

Fig.7 Power spectral density of pitch under wave direction of 180°

Fig.8 Maximum pitch and roll under different wave directions

Fig.9 Maximum surge under different wave directions

Fig.10 Time series of nacelle sway acceleration under wave direction of 60°

Fig.11 Maximum nacelle acceleration under different wave directions

Fig.12 Time series of tensions in remaining tendons under wave direction of 180° in tendon #1 failure condition

Fig.13 Power spectral density of tendon #2 tension under wave direction of 180°

Fig.14 Maximum tendon tension under different wave directions


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