Transient response of a TLP-type floating offshore wind turbine under tendon failure conditions
Journal article, 2021

Among various types of floating offshore wind turbines (FOWTs), the tension leg platform (TLP) floating wind turbines have relatively small motions due to stiff tendons. Similar to TLP applications in the offshore industry, tendon failure may lead to deteriorated stability and large transient responses, which should be considered as part of accidental limit state (ALS) checks at the design stage of the TLP FOWTs. This paper takes the WindStar TLP system as a representative and investigates the transient effects of one-tendon failure on the system responses. A coupled numerical model is first established using the aero-hydro-servo-elastic simulation tool FAST. Subsequent numerical simulations of tendon failure are carried out to consider different tendon breakage and turbine shutdown scenarios in both operational and parked conditions. Response statistics of key design parameters including platform motion, nacelle acceleration, and tendon tension are analyzed. The results indicate that several transient responses of the FOWT under operational conditions may be even higher than the extreme values under 50-year conditions. Our analyses also reveal that the shutdown strategies, if not applied appropriately, may have limited effects in reducing the responses of the FOWT, thus in certain scenarios threaten the safety of the tendon closest to the broken tendon if no other actions are taken. For the considered TLP FOWT, the ALS design requirements dominate over the ultimate limit state requirements. These findings can be relevant to the ALS design of TLP FOWTs.

Coupled aero-hydro-elastic model

Tendon failure

Floating offshore wind turbine (FOWT)

Accidental limit state

Time-domain analysis

Tension leg platform (TLP)

Transient response

Author

Hao Yu Wu

Shanghai Jiao Tong University

Yong Sheng Zhao

Shanghai Jiao Tong University

Yan Ping He

Shanghai Jiao Tong University

Yan Lin Shao

Technical University of Denmark (DTU)

Wengang Mao

Chalmers, Mechanics and Maritime Sciences, Marine Technology

Zhao Long Han

Shanghai Jiao Tong University

Chao Huang

Shanghai Jiao Tong University

Xiao Li Gu

Shanghai Jiao Tong University

Zhi Yu Jiang

University of Agder

Ocean Engineering

0029-8018 (ISSN)

Vol. 220 108486

Subject Categories

Aerospace Engineering

Vehicle Engineering

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1016/j.oceaneng.2020.108486

More information

Latest update

1/14/2021