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Transient Response Estimation of an Offshore Wind Turbine Support System

1
College of Engineering, Ocean University of China, Qingdao 266100, China
2
College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China
3
Powerchina Huadong Engineering Corporation Limited, Hangzhou 311122, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(5), 891; https://doi.org/10.3390/en12050891
Received: 11 February 2019 / Revised: 28 February 2019 / Accepted: 2 March 2019 / Published: 7 March 2019
(This article belongs to the Special Issue Recent Advances in Offshore Wind Technology)
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Abstract

To obtain reliable estimations of the dynamic responses of high-rising marine structures such as offshore wind turbines with obvious nonzero initial conditions, traditional frequency-domain methods cannot be employed because they provide only steady-state results. A novel frequency-domain transient response estimation method for offshore wind turbines is presented in this paper. This method builds upon a recent, significant theoretical development, which found that expressions of external loads in the frequency domain can be obtained by discretizing their eigenvalues and corresponding complex coefficients rather than directly by discrete Fourier transform (DFT) analysis, which makes it possible to deal with nonzero conditions in the frequency domain. One engineering advantage of this approach is its computational efficiency, as the motion equations of the system can be solved in the frequency domain. In order to demonstrate this approach, a case of a monopile-supported wind turbine with nonzero initial conditions was investigated. The numerical results indicate that the approach matches well with the time-domain method, except for a small, earlier portion of the estimated responses. A second case study of a sophisticated, jacket support wind turbine, involving practical issues such as complex external loads and computation efficiency, is also discussed, and comparisons of the results with the time-domain method and traditional frequency-domain method using the commercial software ANSYS are included here. View Full-Text
Keywords: initial condition; frequency domain; transient response estimation; support structure; offshore wind turbine initial condition; frequency domain; transient response estimation; support structure; offshore wind turbine
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Liu, F.; Li, X.; Tian, Z.; Zhang, J.; Wang, B. Transient Response Estimation of an Offshore Wind Turbine Support System. Energies 2019, 12, 891.

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