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 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 Oscillation analysis of doubly-fed unit considering wind speed variation

2021 ◽  
Vol 2087 (1) ◽  
pp. 012035
Author(s):  
Ke Wan
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Wind Shear ◽  
Mechanical Transmission ◽  
Power Fluctuation ◽  
Shadow Effect ◽  
Oscillation Analysis ◽  
Shear Component ◽  
Doubly Fed ◽  
Tower Shadow

Abstract Tower shadow effect and wind shear may cause power oscillation of the unit. In order to study the influence of tower shadow effect and wind shear on the output power of wind turbine, a doubly-fed turbine was taken as an example. Firstly, the influence of tower shadow effect and wind shear was considered to study the periodic power fluctuation characteristics of wind turbines. Then, according to the dynamic model of mechanical transmission mechanism, the influences of the inertia constants of generator, fan and the stiffness coefficient of the shaft system on the transient performance of the wind power generation system were considered respectively. Finally, a single machine infinite bus system model including wind speed model is built on PSCAD/EMTDC platform for simulation. The results show that the tower shadow effect and wind shear component can cause the power fluctuation of the turbine. When the power fluctuation frequency of the turbine is equal to the natural oscillation frequency of the wind turbine shafting, the resonance of the turbine occurs, and the amplitude of oscillation is the largest. Changing the transmission parameters will affect the power fluctuation amplitude and speed response speed of the unit.

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 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.

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 Bumpless Transfer of Parametrized Multivariable Disturbance Observer Based Controller to Reduce Cyclic Loads of Wind Turbine

2018 ◽  
Author(s):  
Raja Muhammad Imran ◽  
Dil Muhammad Akbar Hussain ◽  
Bhawani Shanker Chowdhry ◽  
Arbab Waleed
Keyword(s):  
Wind Turbine ◽  
Wind Shear ◽  
Disturbance Observer ◽  
Smooth Transition ◽  
Cyclic Loads ◽  
Power Fluctuation ◽  
Pitch Control ◽  
Full Load ◽  
Full Load Operation ◽  
Tower Shadow

This paper is concerned with bump-less transfer of parametrized disturbance observer based controller (DOBC) with Individual Pitch Control (IPC) strategy for full load operation of wind turbine. Aerodynamic cyclic loads are reduced by tuning multivariable DOBC with the objective to reduce output power fluctuation, tower oscillation and drive-train torsion. Furthermore tower shadow and wind shear effect are also mitigated using parametrized controller. A scheduling mechanism between two DOBC is developed and tested on Fatigue, Aerodynamics, Structures, and Turbulence ( FAST) code model of National Renewable Energy Laboratory (NREL)’s 5 MW wind turbine. The closed-loop system performance is assessed by comparing the simulation results of proposed controller with a fixed gain and Linear Parameter Varying (LPV) DOBC with Collective Pitch Control (CPC) for full load operation. It is tested with step changing wind to see the behavior of the system under step change with wind shear and tower shadow (cyclic load) effects. Also turbulent wind is applied to see the smooth transition of the controllers. It can be concluded from the results that the proposed parametrized control DOBC with IPC shows smooth transition from one controller to another by interpolation. Moreover fatigue of the gear and tower due to wind shear and tower shadow effects are reduced considerably by the proposed controller as compared to collective pitch control.

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

Study on Power Fluctuation Dispatch and Capacity Design of Short Period Power Fluctuation Compensation System in Consideration of Power Loss

2014 ◽  
Vol 134 (1) ◽  
pp. 57-63
Author(s):  
Akihiro Teguri ◽  
Shunsuke Kawachi ◽  
Jumpei Baba ◽  
Eisuke Shimoda ◽  
Takayuki Sugimoto
Keyword(s):  
Power Loss ◽  
Compensation System ◽  
Capacity Design ◽  
Power Fluctuation ◽  
Short Period

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
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