• Title/Summary/Keyword: 수평축 풍력터빈

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MPPT and yaw-axis control of parallel type wind turbine (병렬형 풍력 발전시스템의 MPPT 및 yaw축 제어)

  • IM, Jong-Wook;CHOY, Ick
    • Proceedings of the KIPE Conference
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    • pp.250-251
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    • 2010
  • 본 연구는 수평축(horizontal axis) 풍력 터빈에 의해서 수직축 발전기를 운전하는 구조 및 그 운전 방식에 관한 것으로서 바람에 의해 수평축 터빈 로터로 입력된 회전력을 기계적으로 두 개의 수직축 회전 성분으로 변환하여 이들로부터 전기 에너지를 얻어내고 필요에 따라 터빈 날개가 바람이 부는 방향을 향하도록 yaw-axis 제어를 하는 기술에 관한 것이다.

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Aerodynamic Design and Performance Prediction of Wind Turbine Blade (풍력터빈 블레이드 공력설계 및 성능예측)

  • Kim, Cheol-Wan;Cho, Tae-Hwan
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.677-681
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    • 2011
  • Characteristics of vertical and horizontal axis wind turbines are explained. The speed and direction of wind on the blade of the Darrieus type turbine changes very severely. Therefore dynamic stall happens periodically and the wake from the front blade deteriorates the performance of rear blades. Blade element momentum theory(BEMT) is widely utilized for aerodynamic design and performace prediction of horizontal axis wind turbine(HAWT). Computation analysis and wind tunnel test are also performed for the performance prediction.

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Comparison of Aerodynamic Loads for Horizontal Axis Wind Turbine (I): with and without Turbulent Inflow (수평축 풍력터빈의 공력 하중 비교 (I): 난류 유입 유·무)

  • Kim, Jin;Kang, Seung-Hee;Ryu, Ki-Wahn
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.44 no.5
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    • pp.391-398
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    • 2016
  • This study focused on the aerodynamic loads of the horizontal axis wind turbine blade due to the normal turbulence inflow condition. Normal turbulence model (NTM) includes the variations of wind speed and direction, and it is characterized by turbulence intensity and standard deviation of flow fluctuation. IEC61400-1 recommends the fatigue analysis for the NTM and the normal wind profile (NWP) conditions. The aerodynamic loads are obtained at the blade hub and the low speed drive shaft for MW class horizontal axis wind turbine which is designed by using aerodynamically optimized procedure. The 6-components of aerodynamic loads are investigated between numerical results and load components analysis. From the calculated results the maximum amplitudes of oscillated thrust and torque for LSS with turbulent inflow condition are about 5~8 times larger than those with no turbulent inflow condition. It turns out that the aerodynamic load analysis with normal turbulence model is essential for structural design of the wind turbine blade.

Aerodynanamic design and performance analysis of a 5kW HAWT rotor blades (5Kw급 수평축 풍력 터빈 로터블레이드의 공력 설게 및 성능예측)

  • Kim, Mun-Oh;Kim, Bum-Suk;Mo, Jang-Ho;Lee, Young-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • pp.182.1-182.1
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    • 2010
  • 현재 전 세계적으로 가장 널리 개발하고 보급되어지고 있는 풍력산업의 시장 규모는 매년 확대되고 있다. 특히 소형 풍력발전 시스템은 낙도 등의 전력 공급이 어려운 지역에 경제성 있는 전력 보급을 가능하게 한다. 국내의 미전화 지역과 일반 가정에서 풍력 에너지 자원을 적극 활용 개발하기 위해서 보다 우수한 성능의 풍력발전기용 블레이드를 설계하고자, 공기역학적인 최적설계에 대해 연구함으로써 추후 보급형 풍력발전 시스템의 개발에 필요한 설계 기술을 확립하고자한다. 본 연구는 설계된 블레이드의 유동해석 및 성능예측을 위하여 경제적으로 많은 지원이 필요한 대규모 풍동실험이 아닌 상용 CFD를 사용하여 보다 효율적으로 우수한 성능을 가지는 풍력 터빈을 설계함에 있다. Reynolds Averaged Navier-Stokes 방정식에 기반을 둔 CFD의 경우 이론적으로 명확한 해석이 가능하고, 실제 터빈의 운전 환경과 동일한 다양한 물리적 변수를 입력 데이터로서 활용할 수 있는 장점이 있기 때문에 풍력 터빈의 설계 과정에서 반영된 미소한 블레이드 형상변화 및 운전 조건의 변화에 따른 유동장의 변화 및 풍력터빈 성능을 정확히 예측할 수 있는 장점을 가지고 있다.

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Wind Loads of 5 MW Horizontal-Axis Wind Turbine Rotor in Parked Condition (운전정지 조건에서 5 MW 수평축 풍력터빈 로터의 풍하중 해석)

  • Ryu, Ki-Wahn;Seo, Yun-Ho
    • Journal of the wind engineering institute of Korea
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    • v.22 no.4
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    • pp.163-169
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    • 2018
  • In this study, wind loads exerted on the offshore wind turbine rotor in parked condition were predicted with variations of wind speeds, yaw angles, azimuth angle, pitch angles, and power of the atmospheric boundary layer profile. The calculated wind loads using blade element theorem were compared with those of estimated aerodynamic loads for the simplified blade shape. Wind loads for an NREL's 5 MW scaled offshore wind turbine rotor were also compared with those of NREL's FAST results for more verification. All of the 6-component wind loads including forces and moments along the three axis were represented on a non-rotating coordinate system fixed at the apex of rotor hub. The calculated wind loads are applicable for the dynamic analysis of the wind turbine system, or obtaining the over-turning moment at the foundation of support structure for wind turbine system.

Blade Design Optimization for 5MW HAWT Considering Wind Environment on Domestic West-South Coast (국내 서남해안 풍황을 고려한 5MW급 수평축 풍력터빈 블레이드의 최적설계)

  • Park, Kyung-Hyun;Jun, Sang-Ook;Jung, Ji-Hun;Cho, Jun-Ho;Lee, Ki-Hak;Lee, Dong-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • pp.58.2-58.2
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    • 2011
  • 본 연구에서는 5MW급 수평축 풍력터빈 블레이드에 대해 국내 서남해안의 풍속특성을 고려한 최적설계를 수행 하였다. 최적설계를 수행하기 위해 블레이드 해석은 Blade Element and Momentum Theory를 이용 하였으며, 설계 시 적용된 기저형상은 NREL에서 제안한 5MW급 풍력터빈 블레이드을 선정하였다. 최적설계를 수행하기 전 설계에 사용된 설계변수들이 풍속에 대해 어떠한 경향을 가지고 있는지 알아보기 위해 Parametric Study를 수행 하였으며, 최적설계는 다목적 최적화 유전 알고리즘인 NSGA-II를 이용하여 평균풍속이 낮은 서남해안의 연간에너지 생산량과 설비이용률을 최대화하였다. 최적화 결과들로부터 설계 조건에 맞는 최적해를 도출 할 수 있었으며, 이를 통해 기저형상의 연간에너지 생산량 및 설비이용률을 보다 향상 시킬 수 있었다.

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A Numerical Study on Analysis of Low Frequency Aero-acoustic Noise for a HAWT of NREL Phase VI (NREL Phase VI 수평축 풍력터빈의 저주파 공력소음 해석에 관한 수치적 연구)

  • Mo, Jang-Oh;Lee, Young-Ho
    • Journal of Advanced Marine Engineering and Technology
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    • v.33 no.8
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    • pp.1170-1179
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    • 2009
  • The purpose of this work is to predict the low frequency aero-acoustic noise generated from the horizontal axis wind turbine, NREL Phase VI for the whole operating conditions of various wind speeds using large eddy simulation and Ffowcs-Williams and Hawkings model provided in the commercial code, FLUENT. Because there is no experimental data about wind turbine noise, we first of all compared aerodynamic performance such as shaft torque and power with experimentally measured value. Performance results show a good agreement with experimental data within about 0.8%. As the wind speed increases, the overall sound pressure level and the sound pressure level by the quadrupole and dipole source show a increasing tendency. Also, sound pressure level is proportional to $r^{-2}$ in the near field and $r^{-1}$ in the far field according to the increase of distance from the center of hub of wind turbine. According to 2 times increase of distance, sound pressure level is reduced by about 6dB.

A CFD Study on the Wake Effect of HAWT for Construction of Wind Farm (풍력단지 건설에 따른 수평축 풍력터빈 후류 영향에 대한 CFD연구)

  • Lee, Sea-Wook;Jo, Jin-Su;Shin, Hyeong-Kee;Gyeong, Nam-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • pp.297-300
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    • 2006
  • Recently the wind farm is constructed all over the world according to the lack of the resources. The spacing between front and rear wind turbines to construct the wind farm. The wake of front wind turbine has a bad effect on the performance of the rear wind turbine. A basic CFD study on the wake effect of HAWT for construction of wind farm was done by the FLUENT. This study shows the wake of front wind turbine and the results of this study will be used to calculate the spacing between front and rear wind turbines

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Aerodynamic Performance for Horizontal Axis Wind Turbine Model using Subsonic Wind Tunnel (풍동실험을 통한 수평축 풍력터빈 모델의 공력성능 연구)

  • Ryu, Ki-Wahn;Yoon, Seong-Jun;Lee, Chang-Su;Choy, Seong-Ok
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.35 no.11
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    • pp.964-972
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    • 2007
  • Wind turbine experiment was carried out for the horizontal axis wind turbine with the aerodynamically optimized blade. From the comparison of aerodynamic performance between upwind and downwind type wind turbine rotor, the measured torque fluctuation of the latter is larger than that of the former. This phenomenon is owing to the interaction of wake generated from support column and blades. The wind turbine model satisfies the design condition in that the measured result of the power coefficient at zero pitch angle shows maximum peak at the designed tip speed ratio, λ = 6. It also shows that the decrease in aerodynamic power due to negative pitch change is more sensitive than that of the same positive pitch change.

Aerodynamic Load Analysis for Wind Turbine Blade in Uniform Flow and Ground Shear Flow (균일 흐름과 지상 전단 흐름에 놓인 수평축 풍력터빈 블레이드의 공력 하중 비교)

  • Kim, Jin;Ryu, Ki-Wahn
    • 한국신재생에너지학회:학술대회논문집
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    • pp.387-390
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    • 2007
  • Recently the diameter of the 5MW wind turbine reaches 126m, and the tower height is nearly the same with the wind turbine diameter. The blade will experience periodic inflow oscillation due to blade rotation inside the ground shear flow region, that is, the inflow velocity is maximum at uppermost position and minimum at lowermost position. In this study we compare the aerodynamic data between two inflow conditions, i.e, uniform flow and normal wind profile. From the computed results all of the relative errors for oscillating amplitudes increased due to the ground shear flow effect. Especially My at hub and $F_x$, $M_y$, $M_z$ at LSS increased enormously. It turns out that the aerodynamic analysis including the ground shear flow effect must be considered for fatigue load analysis.

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