Special Issue "Design, Fabrication and Performance of Wind Turbines 2020"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Wind, Wave and Tidal Energy".

Deadline for manuscript submissions: closed (30 June 2020).

Special Issue Editor

Prof. Dr. Kyung Chun Kim
Website
Guest Editor
Department of Mechanical Engineering, Pusan National University, Busan 46241, South Korea
Interests: organic Rankine cycle; heat transfer and heat exchangers; thermodynamics; experimental fluid mechanics; numerical modelling; advance power generation technologies
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Special Issue Information

Dear Colleagues,

The consumption of fossil fuels has increased, resulting in high CO2 emissions and serious climate change. Research on renewable energy is actively underway in order to solve these environmental problems, and in anticipation of the depletion of fossil fuels. Wind energy is an environmentally-friendly renewable energy source that does not cause environmental pollution, and its use is rapidly spreading around the world. From small-scale vertical axis wind turbines for urban usage to large-scale horizontal axis wind turbines for offshore wind farms, design, fabrication, and optimization technologies are highly required to manage wind energy effectively. Moreover, some new potentials, such as wind farm design, fluid-structure interaction, aero-acoustics, fabrication methods and performance tests by experimental and computational fluid dynamics should be engaged in modern wind turbine communities. Basic objectives are improving the reliability, promoting high efficiency of wind turbines, dynamic performance, reducing wind turbine generated noise and improving power generation efficiencies through high-fidelity approaches. Managing such a wide range of wind turbine scales and usages, design, fabrication, and performance test protocols for various wind turbines is a challenging issue. This Special Issue aims at encouraging researchers to address solutions to overcome the issue.

Prof. Dr. Kyung Chun Kim
Guest Editor

Manuscript Submission Information

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Keywords

  • wind turbines
  • design
  • fabrication
  • performance test
  • control
  • optimization
  • aerodynamics
  • aero-acoustics
  • computational fluid dynamics
  • wind farm

Published Papers (3 papers)

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Research

Open AccessArticle
A Control Scheme with the Variable-Speed Pitch System for Wind Turbines during a Zero-Voltage Ride Through
Energies 2020, 13(13), 3344; https://doi.org/10.3390/en13133344 - 30 Jun 2020
Abstract
Zero-voltage ride through (ZVRT) is the extreme case of low-voltage ride through (LVRT), which represents the optimal grid-connection capability of wind turbines (WTs). Enforcing ZVRT will improve the dynamic performance of WTs and therefore significantly enhance the resiliency of renewable-rich grids. A control [...] Read more.
Zero-voltage ride through (ZVRT) is the extreme case of low-voltage ride through (LVRT), which represents the optimal grid-connection capability of wind turbines (WTs). Enforcing ZVRT will improve the dynamic performance of WTs and therefore significantly enhance the resiliency of renewable-rich grids. A control scheme that includes a pitch system is an essential control aspect of WTs riding through voltage dips; however, the existing control scheme with a pitch system for LVRT cannot distinguish between a ZVRT status and a power-loss condition, and, consequently, does not meet the ZVRT requirements. A system-level control scheme with a pitch system for ZVRT that includes pitch system modeling, control logic, control circuits, and overspeed protection control (OPC) is proposed in this paper for the first time in ZVRT research. Additionally, the field data are shared, a fault analysis of an overspeed accident caused by a voltage dip that describes the operating status at the WT-collapse moment is presented, and some existing WT design flaws are revealed and corrected by the fault analysis. Finally, the pitching performance during a ZVRT, which significantly affects the ZVRT performance of the WT, is obtained from laboratory and field tests. The results validate the effectiveness of the proposed holistic control scheme. Full article
(This article belongs to the Special Issue Design, Fabrication and Performance of Wind Turbines 2020)
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Open AccessArticle
Geometry Design Optimization of a Wind Turbine Blade Considering Effects on Aerodynamic Performance by Linearization
Energies 2020, 13(9), 2320; https://doi.org/10.3390/en13092320 - 07 May 2020
Abstract
For a wind turbine to extract as much energy as possible from the wind, blade geometry optimization to maximize the aerodynamic performance is important. Blade design optimization includes linearizing the blade chord and twist distribution for practical manufacturing. As blade linearization changes the [...] Read more.
For a wind turbine to extract as much energy as possible from the wind, blade geometry optimization to maximize the aerodynamic performance is important. Blade design optimization includes linearizing the blade chord and twist distribution for practical manufacturing. As blade linearization changes the blade geometry, it also affects the aerodynamic performance and load characteristics of the wind turbine rotor. Therefore, it is necessary to understand the effects of the design parameters used in linearization. In this study, the effects of these parameters on the aerodynamic performance of a wind turbine blade were examined. In addition, an optimization algorithm for linearization and an objective function that applies multiple tip speed ratios to optimize the aerodynamic efficiency were developed. The analysis revealed that increasing the chord length and chord profile slope improves the aerodynamic efficiency at low wind speeds but lowers it at high wind speeds, and that the twist profile mainly affects the behaviour at low wind speeds, while its effect on the aerodynamic performance at high wind speeds is not significant. When the blade geometry was optimized by applying the linearization parameter ranges obtained from the analysis, blade geometry with improved aerodynamic efficiency at all wind speeds below the rated wind speed was derived. Full article
(This article belongs to the Special Issue Design, Fabrication and Performance of Wind Turbines 2020)
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Open AccessArticle
Expansion of High Efficiency Region of Wind Energy Centrifugal Pump Based on Factorial Experiment Design and Computational Fluid Dynamics
Energies 2020, 13(2), 483; https://doi.org/10.3390/en13020483 - 19 Jan 2020
Cited by 3
Abstract
The wind energy pump system is a new green energy technology. The wide high efficiency region of pump is of great significance for energy conservation of wind power pumping system. In this study, factorial experiment design (FED) and computational fluid dynamics (CFD) are [...] Read more.
The wind energy pump system is a new green energy technology. The wide high efficiency region of pump is of great significance for energy conservation of wind power pumping system. In this study, factorial experiment design (FED) and computational fluid dynamics (CFD) are employed to optimize the hydraulic design of wind energy centrifugal pump (WECP). The blade outlet width b2, blade outlet angle β2, and blade wrap angle ψ are chosen as factors of FED. The effect of the factors on the efficiency under the conditions of 0.6Qdes, 0.8Qdes, 1.0Qdes, and 1.4Qdes is systematically analyzed. The matching feature of various volute tongue angle with the optimized impeller is also investigated numerically and experimentally. After the optimization, the pump head changes smoothly during full range of flow condition and the high efficiency region is effectively improved. The weighted average efficiency of four conditions increases by 2.55%, which broadens the high efficiency region of WECP globally. Besides, the highest efficiency point moves towards the large flow conditions. The research results provide references for expanding the efficient operation region of WECP. Full article
(This article belongs to the Special Issue Design, Fabrication and Performance of Wind Turbines 2020)
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