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Mats Leijon – One of the best experts on this subject based on the ideXlab platform.

Andrei Dragomirescu – One of the best experts on this subject based on the ideXlab platform.

Ha Thu Le – One of the best experts on this subject based on the ideXlab platform.

  • fundamental time domain wind turbine models for wind power studies
    Renewable Energy, 2007
    Co-Authors: Surya Santoso, Ha Thu Le

    One critical task in any wind power interconnection study involves the modelling of wind Turbines. This paper provides the most basic yet comprehensive time–domain wind turbturbine model upon which more sophisticated models along with their power and speed control mechanisms, can be developed. For this reason, this paper concentrates on the modelling of a fixed-speed wind turbturbine. The model includes turbine‘s aerodynamic, mechanical, and electrical components. Data for the rotor, drive-train, and electrical generator are given to allow replication of the model in its entirety. Each of the component-blocks of the wind turbturbine is modelled separately so that one can easily expand the model to simulate variable-speed wind Turbines or customise the model to suit their needs. Then, an aggregate wind turbturbine model, or wind farm, is developed. This is followed by four case studies to demonstrate how the models can be used to study wind turbturbine operation and power grid integration issues. Results obtained from the case studies show that the models perform as expected.

Yongle Li – One of the best experts on this subject based on the ideXlab platform.

  • Wake Effect of a Horizontal Axis Wind Turbine on the Performance of a Downstream Turbine
    Energies, 2019
    Co-Authors: Haojun Tang, K.m. Shum, Yongle Li

    This paper presents wind tunnel tests on the wake characteristics of a three-blade horizontal axis wind turbturbine and the wake effect on the performance of a downstream turbine. For a single turbine model, the performance was determined and this was followed by measurement of the wind characteristics including velocities, turbulence intensities, and correlation in the wake flow field. Subsequently, taking two horizontal axis wind Turbines in a tandem arrangement into account, their performance was tested and the aerodynamic mechanism was discussed. The results showed that the upstream turbine with blades set at a small pitch angle provided smaller disturbance to the flow, but as the blade turned faster, larger changes in the velocity and the turbulence intensity occurred in its wake due to the more frequent disturbance of the wind turbturbine. The correlation of wake velocities in the turbine swept area also obviously decreased from the free-stream situation. For the downstream turbine, the output powepower loss largely depended on the wake characteristics of the upstream turbine, which was closely related to lower wind velocities or higher turbulence intensities. The decrease in correlation of the streamwise velocity within the blade swept area is accompanied by the increased correlation of the tangential velocity, which may be beneficial to the downstream turbine’s performance.

Christos τ Georgakis – One of the best experts on this subject based on the ideXlab platform.

  • wind Turbines and seismic hazard a state of the art review
    Wind Energy, 2016
    Co-Authors: Evangelos Katsanos, Sebastian Thons, Christos τ Georgakis

    Wind energy is a rapidly growing field of renewable energy, and as such, intensive scientific and societal interest has been already attracted. Research on wind turbturbine structures has been mostly focused on the structural analysis, design and/or assessment of wind Turbines mainly against normal (environmental) exposures while, so far, only marginal attention has been spent on considering extreme natural hazards that threat the reliability of the lifetime-oriented wind turbturbine‘s performance. Especially, recent installations of numerous wind Turbines in earthquake prone areas worldwide (e.g., China, USA, India, Southern Europe and East Asia) highlight the necessity for thorough consideration of the seismic implications on these energy harnessing systems. Along these lines, this state-of-the-art paper presents a comparative survey of the published research relevant to the seismic analysis, design and assessment of wind Turbines. Based on numerical simulation, either deterministic or probabilistic approaches are reviewed, because they have been adopted to investigate the sensitivity of wind Turbines‘ structural capacity and reliability in earthquake-induced loading. The relevance of seismic hazard for wind Turbines is further enlightened by available experimental studies, being also comprehensively reported through this paper. The main contribution of the study presented herein is to identify the key factors for wind Turbinesseismic performance, while important milestones for ongoing and future advancement are emphasized. Copyright © 2016 John Wiley & Sons, Ltd.