In case study: Investigation of tower shadow disturbance and wind shear variations effects on energy production, wind speed and power characteristics

2019 ◽  
Vol 35 ◽  
pp. 148-159 ◽  
Author(s):  
Cem Emeksiz ◽  
Tugce Cetin
Keyword(s):  
Wind Speed ◽  
Wind Shear ◽  
Energy Production ◽  
Power Characteristics ◽  
Tower Shadow

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 Characteristic Analysis of DFIG Wind Turbine under Blade Mass Imbalance Fault in View of Wind Speed Spatiotemporal Distribution

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3178 ◽  
Author(s):  
Shuting Wan ◽  
Kanru Cheng ◽  
Xiaoling Sheng ◽  
Xuan Wang
Keyword(s):  
Wind Speed ◽  
Theoretical Analysis ◽  
Wind Shear ◽  
Natural World ◽  
Spatiotemporal Distribution ◽  
Characteristic Analysis ◽  
Mass Imbalance ◽  
Shadow Effect ◽  
Electromagnetic Power ◽  
Tower Shadow

The blade mass imbalance fault is one of the common faults of the DFIG (Doubly-Fed Induction Generator) wind turbines (WTs). In this paper, considering the spatiotemporal distribution of natural wind speed and the influence of wind shear and tower shadow effect, the influence of blade mass imbalance faults on the electrical characteristics of DFIG WTs is analyzed. Firstly, the analytical expressions and variation characteristics of electromagnetic torque and electromagnetic power under blade mass imbalance are derived before and after consideration of the spatiotemporal distribution of wind speed. Then simulations on the MATLAB/Simulink platform were done to verify the theoretical analysis results. The theoretical analysis and simulation results show that, considering the spatiotemporal distribution of wind speed and the influence of wind shear and tower shadow effect, the blade mass imbalance fault will cause fluctuation at the frequency of 1P (P = the frequency of rotor rotation), 3P, and 6P on electromagnetic power. Fluctuation at 1P is caused by mass imbalance while fluctuation at 3P and 6P are caused by wind speed spatiotemporal distribution; the amplitude of fluctuation at 1P is proportional to the degree of the imbalance fault. Since the equivalent wind speed has been used in this paper instead of the average wind speed, the data is more suitable for the actual operation of the WT in the natural world and can be applied for fault diagnosis in field WT operation.

A methodology for improving wind energy production in low wind speed regions, with a case study application in Iraq

2019 ◽  
Vol 127 ◽  
pp. 89-102 ◽  
Author(s):  
Abdul Salam Darwish ◽  
Sabry Shaaban ◽  
Erika Marsillac ◽  
Nazar Muneam Mahmood
Keyword(s):  
Wind Speed ◽  
Wind Energy ◽  
Energy Production ◽  
Low Wind Speed ◽  
Study Application

Simulation of Wind Speed for an Large Offshore Wind Turbine

2014 ◽  
Vol 971-973 ◽  
pp. 709-713
Author(s):  
Yong Zhi Xie ◽  
An Le Mu
Keyword(s):  
Wind Speed ◽  
Power Spectrum ◽  
Wind Turbine ◽  
Wind Shear ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Superposition Method ◽  
Computing Power ◽  
Special Points ◽  
Tower Shadow

According to the wind shear and tower shadow effect, wind speed model was established for large offshore wind turbine .Simulation of the wind speed has been fulfilled by the harmonic superposition method on the 4 special points of the offshore wind turbine, and the split-Radix FFT was introduced to improve the computational efficiency. The consistency of theoretical power spectrum and computing power spectrum of pulsating wind speed verified the rationality and validity of simulation of the wind speed.

Rotor equivalent wind speed calculation method based on equivalent power considering wind shear and tower shadow

2021 ◽  
Vol 172 ◽  
pp. 882-896
Author(s):  
Yongqian Liu ◽  
Yanhui Qiao ◽  
Shuang Han ◽  
Tao Tao ◽  
Jie Yan ◽  
...  
Keyword(s):  
Wind Speed ◽  
Calculation Method ◽  
Wind Shear ◽  
Tower Shadow

scholarly journals Optimization of Low Head Axial-Flow Turbines for an Overtopping BReakwater for Energy Conversion: A Case Study

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4618
Author(s):  
Antonio Mariani ◽  
Gaetano Crispino ◽  
Pasquale Contestabile ◽  
Furio Cascetta ◽  
Corrado Gisonni ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Control Strategy ◽  
Energy Production ◽  
San Antonio ◽  
Axial Flow ◽  
Complex Process ◽  
Low Head ◽  
Wave Power Conversion ◽  
And Control

Overtopping-type wave power conversion devices represent one of the most promising technology to combine reliability and competitively priced electricity supplies from waves. While satisfactory hydraulic and structural performance have been achieved, the selection of the hydraulic turbines and their regulation is a complex process due to the very low head and a variable flow rate in the overtopping breakwater set-ups. Based on the experience acquired on the first Overtopping BReakwater for Energy Conversion (OBREC) prototype, operating since 2016, an activity has been carried out to select the most appropriate turbine dimension and control strategy for such applications. An example of this multivariable approach is provided and illustrated through a case study in the San Antonio Port, along the central coast of Chile. In this site the deployment of a breakwater equipped with OBREC modules is specifically investigated. Axial-flow turbines of different runner diameter are compared, proposing the optimal ramp height and turbine control strategy for maximizing system energy production. The energy production ranges from 20.5 MWh/y for the smallest runner diameter to a maximum of 34.8 MWh/y for the largest runner diameter.

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