An Effect of Wind Veer on Wind Turbine Performance (original) (raw)
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Influence of wind characteristics on turbine performance
1): Risø,DTU (2): Siemens Wind Power (3): Vestas Wind Systems A/S Summary The uncertainty of power performance measurements is closely related to the uncertainty of the wind speed measurement. An inherent uncertainty in the method of measuring the power curve is by using the wind speed at hub height. The assumption behind this is that the wind speed is representative of the wind over the whole turbine rotor. While this assumption was adequate for smaller wind turbines, this is barely true for the modern multi-MW ones. As a consequence considerable deviations often occur between the expected and the produced power. Wind shear, directional changes and varying turbulence with height as a result of either meteorological and / or terrain conditions call for the adoption of a new measurement method. The size of the rotor combined with the machine hub height means that turbines are often exposed to highly varying wind conditions comprising large wind shear, turbulence variations and direct...
IJLTEMAS VOLUME I ISSUE VII 2ICAE-2012 GOA Study of Performance of Wind Turbine
—The primary application of wind turbines is to extract energy from the wind. Thus, the aerodynamics is a very important aspect of wind turbines and aerodynamics of one wind turbine to the other can be very different. There performance varies from turbine characteristics. The traditional method of measuring wind turbine performance under laboratory conditions in ideal circumstances always tend to be optimistic & hardly reflect how the turbine actually behaves in actual. Real performance affected by local wind conditions, nearby obstructions, power demand profiles and a range of other factors. The wind turbine characteristics are Rotor diameter, Mean wind speed, Cut in speed, Cut out speed, Turbine efficiency and Weibull shape parameter. There is deterioration in performance with time due to wear and tear. What is important is how the turbine reacts and actually delivers power on site. Without proper data this can be very subjective and a matter of personal opinion. These characteristics are discussed in reference to performance of wind turbine in this paper.
Australian Journal of …, 2011
This paper presents an analysis of the wind speed characteristic in Kangar, Northern Malaysia. The Weibull distribution function is applied to analyze the wind speed characteristic and used to calculate the wind power generation potential. The wind power and energy as function of tower height are presented and analyzed in this paper. The result shows that during fifteen days (1 st March to 15 th march 2011), the average hourly wind speed is 2.252126 m/s, based on the analysis of the Weibull distribution function, the wind speed of 2.03 m/s has the highest probability density, exactly is 37.99%, it is an important information to choose a suitable wind turbine for a wind power generation. According to the wind turbine applied in this research, when the wind speed is below 2 m/s or above 16 m/s, the output power is zero and the rotor can not be loaded. At its nominal speed of 8 m/s, the power output is at the rated value of 500 W. During the observation condition, on the 11 March 2010, the average wind turbine voltage is 7.1 V during the day time and 1.3 V during the night time. On the 12 March to 15 th March 2010, the wind speed gives a big energy potential to generate the wind turbine, therefore the average wind turbine voltage 31 V during the day time and 20.3 V during the night time.
The influence of the wind speed profile on wind turbine performance measurements
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To identify the influence of wind shear and turbulence on wind turbine performance, flat terrain wind profiles are analysed up to a height of 160 m. The profiles' shapes are found to extend from no shear to high wind shear, and on many occasions, local maxima within the profiles are also observed. Assuming a certain turbine hub height, the profiles with hub-height wind speeds between 6 m s −1 and 8 m s −1 are normalized at 7 m s −1 and grouped to a number of mean shear profiles. The energy in the profiles varies considerably for the same hub-height wind speed. These profiles are then used as input to a Blade Element Momentum model that simulates the Siemens 3.6 MW wind turbine. The analysis is carried out as time series simulations where the electrical power is the primary characterization parameter. The results of the simulations indicate that wind speed measurements at different heights over the swept rotor area would allow the determination of the electrical power as a function of an 'equivalent wind speed' where wind shear and turbulence intensity are taken into account. Electrical power is found to correlate significantly better to the equivalent wind speed than to the single point hub-height wind speed.
Study of Performance of Wind Turbine
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The primary application of wind turbines is to extract energy from the wind. Thus, the aerodynamics is a very important aspect of wind turbines and aerodynamics of one wind turbine to the other can be very different. There performance varies from turbine characteristics. The traditional method of measuring wind turbine performance under laboratory conditions in ideal circumstances always tend to be optimistic & hardly reflect how the turbine actually behaves in actual. Real performance affected by local wind conditions, nearby obstructions, power demand profiles and a range of other factors. The wind turbine characteristics are Rotor diameter, Mean wind speed, Cut in speed, Cut out speed, Turbine efficiency and Weibull shape parameter. There is deterioration in performance with time due to wear and tear. What is important is how the turbine reacts and actually delivers power on site. Without proper data this can be very subjective and a matter of personal opinion. These characterist...
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As energy demand around the world is increasing day-by-day, wind energy is the good option for energy generation. The most common type of wind turbine is horizontal axis wind turbine (HAWT), but there exist other types. In this paper four different wind turbines are considered, three vertical axis wind turbines (VAWT): the Savonious, the Darrieus, the Giromill or H-rotor; and the HAWT. This study deals with the comparative study of these four different types of wind turbines from the most important aspects including design, construction, maintenance, blade profile. In this study it has been found that VAWT is more advantageous over HAWT in several aspects. Furthermore, different economic, environmental, technical and social issues related with wind energy are discussed. Keywords— Darrieus, Giromill, HAWT, H-rotor, Savonious, VAWT.
Performance Analysis of Wind Turbine
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Geographical conditions Indonesia has natural resources with good potential for the development of renewable energy. One of them is wind, wind is one of the natural resources in Indonesia that can be utilized because Indonesia is an archipelagic country that has a coastline of 81000 km. The largest wind energy resources are located at sea and near the coast. This wind resource can be used to generate electricity using a wind turbine, so this research is a prototype that can simulate a wind power plant (PLTB). The prototype of this wind power plant was tested by simulating the average wind speed in several regions of Indonesia. The wind speed is between 3 m/s – 7 m/s. The wind speed of the blower is regulated by using a dimmer in order to lower and accelerate the wind speed that sweeps the surface area of the wind turbine. From the rotation of the wind turbine, it directly rotates the rotor so that the generator can produce electrical voltage. The output of the generator is connect...
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In this work the rotor vertical axis wind turbine as special frame design with movable vertical location of the vanes. That design increases the torque in the left side of wind turbine by increase drag coefficient, and reduces the negative torque of the frame that rotates contrary to the wind in another side. Fabricate two type model different shapes (flat vane and cavity shape vane), each type made it with two model different number of frame (three frames and four frames). Test models in wind tunnel with variable wind speed to obtain the impact of shape, weight and number of frames on a power coefficient. ABSTRAK: Di dalam kajian ini, rotor turbin angin berpaksi vertikel sebagai rangka khusus telah direkabentuk dengan lokasi vertikel mudahalih oleh bilah kipas. Rekabentuk ini meningkatkan tork di bahagian kiri turbin angin dengan meningkatkan pekali seretan dan mengurangkan tork negatif rangka yang berputar berlawanan dengan angin pada bahagian lain. Dua jenis model berbentuk berla...
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