scholarly journals Passive and semi-active control of an offshore floating wind turbine using a tuned liquid column damper

2015 ◽  
Vol 48 (16) ◽  
pp. 241-247 ◽  
Author(s):  
Christophe Coudurier ◽  
Olivier Lepreux ◽  
Nicolas Petit
Keyword(s):  
Wind Turbine ◽  
Active Control ◽  
Liquid Column ◽  
Tuned Liquid Column Damper ◽  
Floating Wind Turbine ◽  
Offshore Floating Wind Turbine ◽  
Liquid Column Damper

Utilizing TLCD (Tuned Liquid Column Damper) in Floating Wind Turbines

2012 ◽  
Author(s):  
Milad Shadman ◽  
Abbas Akbarpour
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Nonlinear Differential Equations ◽  
Liquid Column ◽  
Degree Of Freedom ◽  
Coupled Systems ◽  
Commercial Development ◽  
Tuned Liquid Column Damper ◽  
Floating Wind Turbine ◽  
Liquid Column Damper

Among the floating wind turbine support concepts for carrying large-scale wind turbines, the barge type is more simple and inexpensive to install. The ability to install barge type platforms over a broad range of sea depths increases the number of site options suitable for its installation. Although there are several advantages related to barge type platforms, its significant angular motions which induce dynamic loads in the rotor, tower and drivetrain, hinder its commercial development. In this study, a single degree-of-freedom TLCD (Tuned Liquid Column Damper), which is placed on the turbine’s tower, is incorporated into a modified version of the aero-elastic code FAST. The response of a floating wind turbine with a barge type support controlled by a TLCD subjected to couple hydrodynamic and aerodynamic loads is investigated. The solution of multi degree-of-freedom floating wind turbine coupled with a TLCD dynamic system is done by a sequential method. In this method, two coupled systems of nonlinear differential equations are solved separately by a modified version of FAST in which an added module solves the nonlinear differential equation of motion of the TLCD. The results are compared to the baseline system. The results indicate that this passive type control approach can be used to improve the structural response of floating wind turbines.

Comparative Study of Utilizing a New Type V-Shaped Tuned Liquid Column Damper and U-Shaped Tuned Liquid Column Damper in Floating Wind Turbines

2012 ◽  
Author(s):  
Milad Shadman ◽  
Abbas Akbarpour
Keyword(s):  
Wind Turbine ◽  
Mathematical Formulation ◽  
Liquid Column ◽  
Degree Of Freedom ◽  
Time Step ◽  
Tuned Liquid Column Damper ◽  
Floating Wind Turbine ◽  
New Type ◽  
Type V ◽  
Liquid Column Damper

While utilizing TLCD (Tuned Liquid Column Damper), severe excitation circumstances may lead to empty one of the vertical sections and make the liquid column to lose its U-Shape which results in dramatic changes in mathematical formulation and physical behavior of the liquid column. In this work, the response of a floating wind turbine with a barge type support controlled by a new type V-Shaped Tuned Liquid Column Damper subjected to couple hydrodynamic and aerodynamic loads is investigated through using a modified version of the aero-elastic code FAST (Fatigue, Aerodynamics, Structures and Turbulence). A sequential method is applied to solve the multi degree of freedom floating wind turbine couple with a single degree of freedom V-Shaped Tuned Liquid Column Damper. Through this method, the nonlinear equation of motion of the damper is incorporated in a modified version of FAST while V-Shaped Tuned Liquid Column Damper damping force due to the fore-aft tower top acceleration on turbine’s tower is calculated in each time step. The results are compared to the floating wind turbine system with TLCD (Tuned Liquid Column Damper) as well as the baseline system. It is shown that utilizing V-Shaped Tuned Liquid Column Damper in comparison to U-Shaped one result in more reliable structural response specifically under severe wind conditions in floating wind turbine systems.

Performance of a Passive Tuned Liquid Column Damper for Floating Wind Turbines

2019 ◽  
Author(s):  
Wei Yu ◽  
Frank Lemmer ◽  
Po Wen Cheng
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Structural Model ◽  
Power Production ◽  
Liquid Column ◽  
Order System ◽  
Elastic Model ◽  
Tuned Liquid Column Damper ◽  
Floating Wind Turbine ◽  
Liquid Column Damper

Abstract The motivation of the present paper is to show the proof-of-concept of a passive Tuned Liquid Column Damper (TLCD) for floating wind turbines, which increases the platform pitch damping and power production under wind and wave excitations. As the first step, a reliable TLCD model is implemented and coupled with a reduced order floating wind turbine model. Here, the TLCD is modelled as a second order system which is known for ships, whereas the structural model is a coupled aero-hydro-servo-elastic model with five degrees of freedom. The results show that the TLCD is able to damp the platform resonances but to a limited extent, which is inline the findings of previous research. However, the improved platform pitch stability allows a larger blade pitch control bandwidth, which is normally limited by the underdamped soft support platform. Therefore, by introducing the passive TLCD into the floating wind turbine system, a better power production is achieved.

scholarly journals Dynamic Modeling of an Offshore Floating Wind Turbine for Application in the Mediterranean Sea

Energies ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 248
Author(s):  
Lorenzo Cottura ◽  
Riccardo Caradonna ◽  
Alberto Ghigo ◽  
Riccardo Novo ◽  
Giovanni Bracco ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Mediterranean Sea ◽  
Wind Farm ◽  
Reference Model ◽  
Wide Spectrum ◽  
Wind Farms ◽  
Offshore Wind ◽  
Floating Wind Turbine ◽  
The Mediterranean ◽  
Offshore Floating Wind Turbine

Wind power is emerging as one of the most sustainable and low-cost options for energy production. Far-offshore floating wind turbines are attractive in view of exploiting high wind availability sites while minimizing environmental and landscape impact. In the last few years, some offshore floating wind farms were deployed in Northern Europe for technology validation, with very promising results. At present time, however, no offshore wind farm installations have been developed in the Mediterranean Sea. The aim of this work is to comprehensively model an offshore floating wind turbine and examine the behavior resulting from a wide spectrum of sea and wind states typical of the Mediterranean Sea. The flexible and accessible in-house model developed for this purpose is compared with the reference model FAST v8.16 for verifying its reliability. Then, a simulation campaign is carried out to estimate the wind turbine LCOE (Levelized Cost of Energy). Based on this, the best substructure is chosen and the convenience of the investment is evaluated.

Comparison of Spar and Semisubmersible Floater Concepts of Offshore Wind Turbines Using Long-Term Analysis

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Hasan Bagbanci ◽  
D. Karmakar ◽  
C. Guedes Soares
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Transfer Functions ◽  
Probability Distributions ◽  
Offshore Wind ◽  
Short Term ◽  
Offshore Wind Turbines ◽  
Floating Wind Turbine ◽  
Offshore Floating Wind Turbine

The long-term probability distributions of a spar-type and a semisubmersible-type offshore floating wind turbine response are calculated for surge, heave, and pitch motions along with the side-to-side, fore–aft, and yaw tower base bending moments. The transfer functions for surge, heave, and pitch motions for both spar-type and semisubmersible-type floaters are obtained using the fast code and the results are also compared with the results obtained in an experimental study. The long-term predictions of the most probable maximum values of motion amplitudes are used for design purposes, so as to guarantee the safety of the floating wind turbines against overturning in high waves and wind speed. The long-term distribution is carried out using North Atlantic wave data and the short-term floating wind turbine responses are represented using Rayleigh distributions. The transfer functions are used in the procedure to calculate the variances of the short-term responses. The results obtained for both spar-type and semisubmersible-type offshore floating wind turbine are compared, and the study will be helpful in the assessments of the long-term availability and economic performance of the spar-type and semisubmersible-type offshore floating wind turbine.

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