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.

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.

Fully Coupled Aero-Hydro-Structural Simulation of New Floating Wind Turbine Concept

2018 ◽  
Author(s):  
Aengus Connolly ◽  
Marc Guyot ◽  
Marc Le Boulluec ◽  
Léna Héry ◽  
Aonghus O’Connor
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Structural Model ◽  
Capital Expenditure ◽  
Offshore Wind ◽  
Floating Platform ◽  
Simulation Methodology ◽  
Floating Wind Turbine ◽  
Floating Offshore Wind Turbines ◽  
Fully Coupled

This paper describes a fully coupled numerical simulation methodology which is tailored towards floating offshore wind turbines. The technique assembles three key components; an aerodynamic model of the applied wind loads based on blade element momentum theory, a structural model of the floating platform and its associated mooring lines based on the nonlinear finite element method, and a hydrodynamic model of the wave-induced forces based on potential flow theory. The simulation methodology has been implemented in a commercial software product called ‘Flexcom Wind’, and the technical validation involves comparisons with experimental data derived from model-scale tank test facilities. The validation process centres on an innovative floating wind turbine concept developed by Eolink. Unlike most wind turbines in industry which are supported by a single mast, this patented design uses four separate pillars to connect the turbine structure to the corners of the floating platform. This unique configuration offers several advantages over conventional designs, including a more even stress distribution in structural members, reduced dynamic vibration, smaller floater size and lower overall capital expenditure. Data obtained from the numerical simulations combined with the empirical tests is helping to optimise the device, with a view to further improving its structural design and performance.

scholarly journals Holistic simulation of wind turbines with fully aero-elastic and electrical model

2021 ◽  
Author(s):  
Marcus Wiens ◽  
Sebastian Frahm ◽  
Philipp Thomas ◽  
Shoaib Kahn
Keyword(s):  
Renewable Energy ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Low Voltage ◽  
Renewable Energy Sources ◽  
Elastic Model ◽  
Electrical Model ◽  
Holistic Model ◽  
Electric System ◽  
Electrical Components

AbstractRequirements for the design of wind turbines advance facing the challenges of a high content of renewable energy sources in the public grid. A high percentage of renewable energy weaken the grid and grid faults become more likely, which add additional loads on the wind turbine. Load calculations with aero-elastic models are standard for the design of wind turbines. Components of the electric system are usually roughly modeled in aero-elastic models and therefore the effect of detailed electrical models on the load calculations is unclear. A holistic wind turbine model is obtained, by combining an aero-elastic model and detailed electrical model into one co-simulation. The holistic model, representing a DFIG turbine is compared to a standard aero-elastic model for load calculations. It is shown that a detailed modelling of the electrical components e.g., generator, converter, and grid, have an influence on the results of load calculations. An analysis of low-voltage-ride-trough events during turbulent wind shows massive increase of loads on the drive train and effects the tower loads. Furthermore, the presented holistic model could be used to investigate different control approaches on the wind turbine dynamics and loads. This approach is applicable to the modelling of a holistic wind park to investigate interaction on the electrical level and simultaneously evaluate the loads on the wind turbine.

Sign in / Sign up

Export Citation Format

Share Document