Shaft speed ripples in wind turbines caused by tower shadow and wind shear

2014 ◽  
Vol 8 (2) ◽  
pp. 195-202 ◽  
Author(s):  
Jeroen D.M. De Kooning ◽  
Tine L. Vandoorn ◽  
Jan Van de Vyver ◽  
Bart Meersman ◽  
Lieven Vandevelde
Keyword(s):  
Wind Turbines ◽  
Wind Shear ◽  
Shaft Speed ◽  
Tower Shadow

scholarly journals Time-Domain Modeling of Tower Shadow and Wind Shear in Wind Turbines

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Swagata Das ◽  
Neeraj Karnik ◽  
Surya Santoso
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Time Domain ◽  
Wind Shear ◽  
Electrical Power ◽  
Rotational Frequency ◽  
Domain Modeling ◽  
Periodic Fluctuations ◽  
Electrical Power Output ◽  
Tower Shadow

Tower shadow and wind shear contribute to periodic fluctuations in electrical power output of a wind turbine generator. The frequency of the periodic fluctuations is times the blade rotational frequency , where is the number of blades. For three-bladed wind turbines, this inherent characteristic is known as the effect. In a weak-power system, it results in voltage fluctuation or flicker at the point of common coupling of the wind turbine to the grid. The phenomenon is important to model so as to evaluate the flicker magnitude at the design level. Hence, the paper aims to develop a detailed time-domain upwind fixed speed wind turbine model which includes the turbine's aerodynamic, mechanical, electrical, as well as tower shadow and wind shear components. The model allows users to input factors such as terrain, tower height, and tower diameter to calculate the oscillations. The model can be expanded to suit studies involving variable speed wind turbines. Six case studies demonstrate how the model can be used for studying wind turbine interconnection and voltage flicker analysis. Results indicate that the model performs as expected.

scholarly journals Dynamic Modeling of Wind Turbines Based on Estimated Wind Speed under Turbulent Conditions

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1907 ◽  
Author(s):  
Ahmed G. Abo-Khalil ◽  
Saeed Alyami ◽  
Khairy Sayed ◽  
Ayman Alhejji
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Wind Shear ◽  
Large Scale ◽  
Estimation Error ◽  
Turbine Rotor ◽  
Average Wind Speed ◽  
Rotating Speed ◽  
Tower Shadow

Large-scale wind turbines with a large blade radius rotates under fluctuating conditions depending on the blade position. The wind speed is maximum in the highest point when the blade in the upward position and minimum in the lowest point when the blade in the downward position. The spatial distribution of wind speed, which is known as the wind shear, leads to periodic fluctuations in the turbine rotor, which causes fluctuations in the generator output voltage and power. In addition, the turbine torque is affected by other factors such as tower shadow and turbine inertia. The space between the blade and tower, the tower diameter, and the blade diameter are very critical design factors that should be considered to reduce the output power fluctuations of a wind turbine generator. To model realistic characteristics while considering the critical factors of a wind turbine system, a wind turbine model is implemented using a squirrel-cage induction motor. Since the wind speed is the most important factor in modeling the aerodynamics of wind turbine, an accurate measurement or estimation is essential to have a valid model. This paper estimates the average wind speed, instead of measuring, from the generator power and rotating speed and models the turbine’s aerodynamics, including tower shadow and wind shear components, without having to measure the wind speed at any height. The proposed algorithm overcomes the errors of measuring wind speed in single or multiple locations by estimating the wind speed with estimation error less than 2%.

scholarly journals Power fluctuation and power loss of wind turbines due to wind shear and tower shadow

2017 ◽  
Vol 12 (3) ◽  
pp. 321-332 ◽  
Author(s):  
Binrong Wen ◽  
Sha Wei ◽  
Kexiang Wei ◽  
Wenxian Yang ◽  
Zhike Peng ◽  
...  
Keyword(s):  
Wind Turbines ◽  
Power Loss ◽  
Wind Shear ◽  
Power Fluctuation ◽  
Tower Shadow

scholarly journals Mitigation of Flickering in DFIG Based Wind Turbines using Individual Pitch Control

2019 ◽  
Vol 8 (11S2) ◽  
pp. 71-78
Keyword(s):  
Wind Energy ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Wind Shear ◽  
Control Method ◽  
Matlab Simulink ◽  
Pitch Control ◽  
Set Up ◽  
Individual Pitch Control ◽  
Tower Shadow

due to the breeze beat boom, wind shear and tower shadow affects, community related breeze generators are the wellsprings of power modifications which additionally can also supply shimmer over the span of regular development. This paper proposes a model of a MW-set up variable-pace wind turbine with a doubly continued confirmation generator to research the blaze transmission and equalization problems. To facilitate the flashes we were the usage of a man or female make commitments manage contraption the earlier days. on this paper, a moved pitch territory control method relying on the smooth cause is proposed for the variable-rhythm wind turbine systems, in which the generator pace slip-up and exchange speed blunder are utilized as manage enter elements for the cushy cause controller (FLC). The pitch vicinity reference is made through manner of the use of the FLC, that could capture up at the nonlinear regular for the pitch element to the breeze pace. This paper offers head alternate of wind energy, wind turbine linearization and dynamic displaying are settled. The feathery reason controller is carried out for trade draining edge of wind turbine and customary energy might be collect. The square represent of proposed pitch oversee which consolidates pitch controller, actuator version and turbine linearized displayed with the nice valuable asset of the usage of Matlab/Simulink programming.

scholarly journals Modeling and Simulation of Wind Shear and Tower Shadow on Wind Turbines

2014 ◽  
Vol 17 ◽  
pp. 471-477 ◽  
Author(s):  
H. Sintra ◽  
V.M.F. Mendes ◽  
R. Melício
Keyword(s):  
Modeling And Simulation ◽  
Wind Turbines ◽  
Wind Shear ◽  
Tower Shadow

scholarly journals Empirical correlation between hub height and local wind shear exponent for different sizes of wind turbines

2013 ◽  
Vol 4 ◽  
pp. 45-51 ◽  
Author(s):  
Shafiqur Rehman ◽  
Luai M. Al-Hadhrami ◽  
Md. Mahbub Alam ◽  
J.P. Meyer
Keyword(s):  
Wind Turbines ◽  
Wind Shear ◽  
Empirical Correlation ◽  
Local Wind

Using a Supercapacitor to Mitigate Battery Microcycles Due to Wind Shear and Tower Shadow Effects in Wind-Diesel Microgrids

2020 ◽  
Vol 11 (5) ◽  
pp. 3677-3689 ◽  
Author(s):  
Ebrahim Mohammadi ◽  
Ramtin Rasoulinezhad ◽  
Gerry Moschopoulos
Keyword(s):  
Wind Shear ◽  
Tower Shadow
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