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Site Calibration for the Wind Turbine Performance Evaluation
Yoonsu Nam,Neungsoo Yoo,Jungwan Lee 대한기계학회 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.12
The accurate wind speed information at the hub height of a wind turbine is very essential to the exact estimation of the wind turbine power performance testing. Several methods on the site calibration, which is a technique to estimate the wind speed at the wind turbine's hub height based on the measured wind data using a reference meteorological mast, are introduced. A site calibration result and the wind resource assessment for the TaeK wanRyung test site are presented using three-month wind data from a reference meteorological mast and the other mast temporarily installed at the site of wind turbine. Besides, an analysis on the uncertainty allocation for the wind speed correction using site calibration is performed.<br/>
Development of a Time-Domain Simulation Tool for Offshore Wind Farms
Hyungyu Kim,Kwansoo Kim,Insu Paek,Neungsoo Yoo 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.4
A time-domain simulation tool to predict the dynamic power output of wind turbines in an offshore wind farm was developed in this study. A wind turbine model consisting of first or second order transfer functions of various wind turbine elements was combined with the Ainslie’s eddy viscosity wake model to construct the simulation tool. The wind turbine model also includes an aerodynamic model that is a look up table of power and thrust coefficients with respect to the tip speed ratio and pitch angle of the wind turbine obtained by a commercial multi-body dynamics simulation tool. The wake model includes algorithms of superposition of multiple wakes and propagation based on Taylor’s frozen turbulence assumption. Torque and pitch control algorithms were implemented in the simulation tool to perform max-Cp and power regulation control of the wind turbines. The simulation tool calculates wind speeds in the two-dimensional domain of the wind farm at the hub height of the wind turbines and yields power outputs from individual wind turbines. The NREL 5MW reference wind turbine was targeted as a wind turbine to obtain parameters for the simulation. To validate the simulation tool, a Danish offshore wind farm with 80 wind turbines was modelled and used to predict the power from the wind farm. A comparison of the prediction with the measured values available in literature showed that the results from the simulation program were fairly close to the measured results in literature except when the wind turbines are congruent with the wind direction.
Development of a Time-Domain Simulation Tool for Offshore Wind Farms
Kim, Hyungyu,Kim, Kwansoo,Paek, Insu,Yoo, Neungsoo The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.4
A time-domain simulation tool to predict the dynamic power output of wind turbines in an offshore wind farm was developed in this study. A wind turbine model consisting of first or second order transfer functions of various wind turbine elements was combined with the Ainslie's eddy viscosity wake model to construct the simulation tool. The wind turbine model also includes an aerodynamic model that is a look up table of power and thrust coefficients with respect to the tip speed ratio and pitch angle of the wind turbine obtained by a commercial multi-body dynamics simulation tool. The wake model includes algorithms of superposition of multiple wakes and propagation based on Taylor's frozen turbulence assumption. Torque and pitch control algorithms were implemented in the simulation tool to perform max-Cp and power regulation control of the wind turbines. The simulation tool calculates wind speeds in the two-dimensional domain of the wind farm at the hub height of the wind turbines and yields power outputs from individual wind turbines. The NREL 5MW reference wind turbine was targeted as a wind turbine to obtain parameters for the simulation. To validate the simulation tool, a Danish offshore wind farm with 80 wind turbines was modelled and used to predict the power from the wind farm. A comparison of the prediction with the measured values available in literature showed that the results from the simulation program were fairly close to the measured results in literature except when the wind turbines are congruent with the wind direction.
소형 풍력발전기 날개 모니터링을 위한 FBG 변형률 센서의 적용
김창환(Changhwan Kim),백인수(Insu Paek),유능수(Neungsoo Yoo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Arrays of Fiber Bragg Grating (FBG) sensors and strain gauges were used to extract deflection mode shapes of a small wind turbine blade made from fiber reinforced plastic (FRP). A cantilever system developed for this study was employed to fix the blade at the root. Impact Responses of the blade using the sensors attached from the top and bottom surfaces of the blade were measured. The fundamental frequencies and higher modes of the blade cantilever system obtained from both sensors were almost identical. Deflection mode shapes were estimated from the strain modes. The mode shapes were close but slightly different from each other. The differences are considered due to the fact that the top and bottom sections where the sensors were attached are Non-symmetric.
김창환(Changhwan Kim),백인수(Insu Paek),유능수(Neungsoo Yoo),남윤수(Yoon Su Nam) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
A load-monitoring system that resembles a small wind turbine is designed to measure the dynamic load of a small wind turbine blade The optical fiber sensors (FBGs) are used in the system to measure the dynamic strain of the blades. The system is designed to perform measurements while the blades are rotating at a specified rotating speed by a motor installed in the Nacelle. It can also be used to test individual pitch control (IPC) algorithms and monitor the conditions of various parts including the main shaft, bearing, tower, and the nacelle in a wind tunnel in the future.
상용 CFD 프로그램을 이용한 풍력터빈 축소모델 출력계수 검증 및 후류 해석
김병수(Kim Byoungsu),백인수(Paek Insu),유능수(Yoo Neungsoo) 한국태양에너지학회 2015 한국태양에너지학회 논문집 Vol.35 No.1
A numerical simulation on the wake flow of a wind turbine which is a scaled version of a multi-megawatt wind turbine has been performed. Two different inlet conditions of averaged wind speed including one below and one above the rated wind speed were used in the simulation. Steady-state pitch angles of the blade associated with the two averaged wind speeds were imposed for the simulation. The steady state analysis based on the Reynolds averaged Navier-Stokes equations with the method of frame motion were used for the simulation to find the torque of the rotor and the wake field behind the wind turbine. The simulation results were compared with the results obtained from the wind tunnel testing. From comparisons, it was found that the simulation results on the turbine power are pretty close to the experimental values. Also, the wake results were relatively close to the experimental results but there existed some discrepancy in the shape of velocity deficit. The reason for the discrepancy is considered due to the steady state solution with the frame motion method used in the simulation. However, the method is considered useful for solutions with much reduced calculation time and reasonably good accuracy compared to the transient analysis.
손재훈(Son Jaehoon),백인수(Paek Insu),유능수(Yoo Neungsoo),남윤수(Nam Yoonsu) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.2
The effect of wake on the performance and load of a downstream wind turbine on a floating platform is investigated with a computer simulation in this study. The floating platform consists of a square platform having a dimension of 200 m x 200 m with four 2 MW wind turbines installed. For the simulation, only two wind turbines in series with the wind direction were considered and the floating platform was assumed to be stationary due to its large size. Also, a commercial program based on multi-body dynamics and eddy viscosity wake model was used. It was found from simulation that the power from the downstream wind turbine could be reduced by more than 50% of the power from the upstream wind turbine. However, due to the increase in the turbulence intensity, the power is greater but more fluctuating than the power produced by a wind turbine experiencing the same wind speed without wake. Also, it was found that the load of the down stream wind turbine be comes lower than the load of the upstream wind turbine but higher than the load of a wind turbine experiencing the same wind speed without wake.