Active Control of Asymmetrical Wake Flow in Wind Energy Systems

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: closed (31 January 2024) | Viewed by 3300

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Guest Editor
School of Civil Engineering & Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
Interests: wind farm simulation; wind turbine dynamics; off-shore floating wind turbine
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Special Issue Information

Dear Colleagues,

We invite submissions to a special Issue of the journal Symmetry on the topic “Active Control of Asymmetrical Wake Flow in Wind Energy Systems”.

The use of conventional energy resources has led to severe environmental problems, with considerable time and effort required for environmental recovery. Therefore, an increasing number of countries have focused on developing clean and renewable energy resources (e.g., solar, wave, and wind energy). Wind energy has been extensively exploited in recent decades. Wind farms are being established worldwide to harvest wind energy.

With the development of wind energy utilization, more researchers and engineers have realized the importance of wind farm layout optimization and have conducted numerous studies on the layout optimization of wind turbines in onshore wind farms. However, for the established wind farms, the layout can not be changed; therefore the active asymmetrical wake control of the wind turbines can be utilized to improve the power output.

This special Issue is focused on the wake model of the wind turbines, the CFD modeling of the interaction between the wake and the terrain, the asymmetrical wake-flow induced dynamic motions of the wind turbines, the optimization of the layout the wind farms, and the vibration-control of the wind turbines. The invitation also includes perspective review papers on recent advances and opportunities for the active control of wind farm.

Dr. Zhenqing Liu
Guest Editor

Manuscript Submission Information

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Keywords

  • wind turbine
  • asymmetrical wake flow control
  • vibration control
  • layout optimization
  • analytical wake model
  • terrain–turbine interaction
  • cost model

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Published Papers (2 papers)

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Research

15 pages, 2558 KiB  
Article
Adaptive Feedback Control of Nonminimum Phase Boost Converter with Constant Power Load
by Khalil Jouili, Monia Charfeddine and Mohammed Alqarni
Symmetry 2024, 16(3), 352; https://doi.org/10.3390/sym16030352 - 14 Mar 2024
Cited by 1 | Viewed by 1108
Abstract
The inherent negative impedance characteristics of a Constant Power Load (CPL) pose a potential threat to the stability of the bus voltage in a DC microgrid consisting of a symmetrical parallel boost converter. We suggest an adaptive feedback control technique using the input–output [...] Read more.
The inherent negative impedance characteristics of a Constant Power Load (CPL) pose a potential threat to the stability of the bus voltage in a DC microgrid consisting of a symmetrical parallel boost converter. We suggest an adaptive feedback control technique using the input–output exact feedback linearization theory for a boost converter integrated into a DC microgrid to improve the stability of the DC bus voltage. This approach involves a transformation of the model into a Brunovsky canonical form, effectively addressing the nonlinear challenges arising from the CPL and the nonminimum phase characteristics of the boost converter. Subsequently, guided by the Lyapunov approach, an adaptation law is established to fine-tune the controller’s gain vector, facilitating the tracking of a predefined linearizing feedback control. We methodically create a method to choose the gains of the adaptive controller in order to guarantee an adequate output response. We validate our suggested controller’s performance using simulation. Full article
(This article belongs to the Special Issue Active Control of Asymmetrical Wake Flow in Wind Energy Systems)
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14 pages, 3359 KiB  
Article
Simulation of Pressure–Velocity Correlations by Green’s Function Based on Reynolds Stress Model
by Jian Zhang, Qingshan Yang and Qiusheng Li
Symmetry 2022, 14(7), 1352; https://doi.org/10.3390/sym14071352 - 30 Jun 2022
Cited by 1 | Viewed by 1610
Abstract
Cost-effective wind energy harvesting by wind turbines in urban areas needs to strengthen the required flow field properties, such as mean velocity, turbulence, and its distribution. This paper conducts a series of CFD simulations to investigate the characteristics and related mechanisms of flow [...] Read more.
Cost-effective wind energy harvesting by wind turbines in urban areas needs to strengthen the required flow field properties, such as mean velocity, turbulence, and its distribution. This paper conducts a series of CFD simulations to investigate the characteristics and related mechanisms of flow within the cavity, considering the force–turbulence interactions at the RANS scales. The pressure–velocity correlation term is formulated and solved by the elliptic relaxation equation to compensate for the Reynolds stress overestimation. Numerical simulations of flow over an open cavity with the proposed model are compared with corresponding PIV data. The results show that the mean velocity and the fluctuation velocity along the streamwise direction exist a slightly favorable pressure gradient. While the fluctuation velocity and fluctuation pressure show different correlation characteristics along the streamwise direction. Moreover, the pressure–velocity fluctuation correlation becomes obvious near the upper corner of the cavity due to the favorable pressure gradient. Hence, the leading and trailing locations of the cavity are both obvious favorable regions and further emphasis should be put on both high-accurate simulation methods and practical applications. Full article
(This article belongs to the Special Issue Active Control of Asymmetrical Wake Flow in Wind Energy Systems)
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