Influences of Wind Shear and Tower Shadow on the Power Output of Wind Turbine

doi:10.3901/JME.2018.10.124

Abstract

Abstract: The influences of the wind shear and tower shadow on the power output of wind turbines in terms of power fluctuation and power loss are investigated. Firstly, the wind shear model and the tower shadow model are described in detail. The tower shadow model is modified in view of the cone-shaped towers of modern large-scaled wind turbines. Subsequently, power fluctuation and power loss due to wind shear and tower shadow are analyzed for NREL 5 MW baseline wind turbine with blade element momentum(BEM) theory. Results indicate that the power fluctuation is mainly caused by the tower shadow, whereas the power loss is primarily induced by the wind shear. The power loss can be divided into wind farm loss and rotor loss. The wind farm loss is a constant while the rotor loss is strongly influenced by the wind turbine control strategies. When the variable-speed controller works, the rotor loss stabilizes around zero, but when blade pitch controller works, the rotor loss increases as the wind speed intensifies.

Key words: blade element momentum (BEM), power, power coefficient, tower shadow, wind shear, wind turbine

CLC Number:

TK81
TK83

WEN Binrong, WEI Sha, WEI Kexiang, YANG Wenxian, PENG Zhike, CHU Fulei. Influences of Wind Shear and Tower Shadow on the Power Output of Wind Turbine[J]. Journal of Mechanical Engineering, 2018, 54(10): 124-132.

References

[1] DOLAN D S L, LEHN P W. Simulation model of wind turbine 3p torque oscillations due to wind shear and tower shadow[J]. IEEE Transactions on Energy Conversion, 2006, 21(3):717-724.
[2] BAYNE S B, GIESSELMANN M G. Effect of blade passing on a wind turbine output[J]. Energy Conversion Engineering Conference and Exhibit, 2000. (IECEC) 35th Intersociety, 2000, 2:775-781.
[3] THIRINGER T, Power quality measurements performed on a low-voltage grid equipped with two wind turbines[J]. IEEE Transactions on Energy Conversion, 1996, 11(3):601-606.
[4] THIRINGER T, DAHLBERG J A. Periodic pulsations from a three-bladed wind turbine[J]. IEEE Transactions on Energy Conversion, 2001, 16(2):128-133.
[5] SORENSEN P, HANSEN A D, ANDRE P, et al. Wind models for simulation of power fluctuations from wind farms[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2002, 90:1381-1402.
[6] 孔屹刚, 顾洁, 王杰. 基于风剪切和塔影效应的大型风力机载荷分析与功率控制[J]. 东南大学学报, 2010, 40(1):228-233. KONG Yigang, GU Jie, WANG Jie. Load analysis and power control of large wind turbine based on wind shear and tower shadow[J]. Journal of Southeast University, 2010, 40(1):228-233.
[7] 孔屹刚, 王杰, 顾洁, 等. 基于风剪切和塔影效应的风力机风速动态建模[J]. 太阳能学报, 2011, 32(8):1237-1244. KONG Yigang, WANG Jie, GU Jie, et al. Dynamics modeling of wind speed based on wind shear and tower shadow for wind turbine[J]. Acta Energiae Solaris Sinica, 2011, 32(8):1237-1244.
[8] DAS S, KARNIK N, SANTOSO S. Time-Domain modeling of tower shadow and wind shear in wind turbines[J]. ISRN Renewable Energy, 2011, 2011:1-11.
[9] FADAEINEDJAD R, MOSCHOPOULOS G, MOALLEM M. The Impact of tower shadow, yaw error, and wnd shears on power quality in a wind-diesel system[J]. IEEE Transactions on Energy Conversion, 2009, 24(1):102-111.
[10] MCSWIGGAN D, LITTLER T, MORROW D J, et al. A study of tower shadow effect on fixed-speed wind turbines[C]//Proceedings of the 43rd International Universities Power Engineering Conference, 2008:1-5.
[11] BOSSANYI E A, HASSAN G, LANE S. Individual blade pitch control for load reduction[J]. Wind Energy, 2003, 6(2):119-128.
[12] NAMIK H, STOL K. Individual blade pitch control of floating offshore wind turbines[J]. Wind Energy, 2010, 13(1):74-85.
[13] 邢作霞, 陈雷, 厉伟, 等. 减小塔影和风切变效应的变桨距控制方法研究[J]. 太阳能学报, 2013, 34(6):916-923. XING Zuoxia, CHEN Lei, LI Wei, et al. Pitch control method study on reducing the effects of tower shadow and wind shear[J]. Acta Energiae Solaris Sinica, 2013, 34(6):916-923.
[14] 周波,龚华军,甄子洋. 风切变和塔影效应对风力机变桨距控制的影响分析[J]. 可再生能源, 2012, 30(1):27-32. ZHOU Bo, GONG Huajun, ZHEN Ziyang. The analysis of the pitch control of wind turbine by the influences of wind shear and tower shadow[J]. Renewable Energy Resources, 2012, 30(1):27-32.
[15] 廖明夫, 徐可, 吴斌, 等. 风切变对风力机功率的影响[J]. 沈阳工业大学学报, 2008, 30(2):p. 163-167. LIAO Mingfu, XU ke, WU Bin, et al. Effect of wind shear on wind turbine power[J]. Journal of Shenyang University of Technology, 2008, 30(2):163-167.
[16] JONKMAN J, BUTTERFIELD S, MUSIALl W, et al. Definition of a 5-MW reference wind turbine for offshore system development[S]. NREL/TP-500-38060, NREL:Golden, CO, 2009.
[17] 贾要勤. 风力发电实验用模拟风力机[J]. 太阳能学报, 2004, 25(6):735-739. JIA Yaoqin. A wind turbine simulator for wind generation research[J]. Acta Energiae Solaris Sinica, 2004, 25(6):735-739.
[18] LI Weiwei, XU Dianguo, ZHANG Wei, et al. Research on wind turbine emulation based on DC motor[J]. IEEE Conference on Industrial Electronics and Applications, 2007(5):2589-2593.
[19] 姜海波, 曹树良, 阳平. 水平轴风力机的功率极限[J]. 机械工程学报, 2011, 47(10):113-118. JIANG Haibo, CAO Shuliang, YANG Ping. Power limit of horizontal axis wind turbine[J]. Journal of Mechanical Engineering, 2011, 47(10):113-118.