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Journal articles on the topic 'Wind turbine efficiency'
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1
Doerffer, Piotr, Krzysztof Doerffer, Tomasz Ochrymiuk, and Janusz Telega. "Variable Size Twin-Rotor Wind Turbine." Energies 12, no. 13 (July 2, 2019): 2543. http://dx.doi.org/10.3390/en12132543.
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The paper presents a new concept of a vertical axis wind turbine. The idea is focused on small wind turbines, and therefore, the dominating quality is safety. Another important necessary feature is efficient operation at small winds. This implies an application of the drag driven solution such as the Savonius rotor. The presented concept is aimed at reducing the rotor size and the cost of implementation. A new wind turbine solution, its efficiency, and functionality are described. The results of numerical simulations being a proof of the concept are reported. The simulations were followed by wind tunnel tests. Finally several prototypes were built and investigated for a longer period of time. The new wind turbine concept has undergone various testing and implementation efforts, making this idea matured, well proven and documented. A new feature, namely, the wind turbine size reduction at strong winds, or in other words, an increase in the wind turbine size at low winds is the reason why it is difficult to compare this turbine with other turbines on the market. The power output depends not only on the turbine efficiency but also on its varying size.
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Yershina, A. K. "A METHOD FOR INCREASING THE EFFICIENCY OF A WIND TURBINE." Eurasian Physical Technical Journal 17, no. 2 (December 24, 2020): 73–77. http://dx.doi.org/10.31489/2020no2/73-77.
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The article discusses the possibilities of improving the energy efficiency of wind turbines. A brief analysis of the current state of development of alternative energy, in particular wind energy in Kazakhstan, is considered. It is shown that an increase in the power of a wind - power plant is possible due to the use of a system of simultaneously rotating rotors. A brief description of the Bidarier-2 wind turbine construction, which can significantly increase the power removed from the wind flow, is given. The possibility of further increasing the efficiency of the Bidarrieus-2 wind turbine by means of a concentrator is discussed. The unique method for the speed controlling of the wind flow with the help of sliding flaps of the guide concentrator in order to improve the performance of the wind turbine at high wind speed is proposed first time.
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Jamal, Jamal, A. M. Shiddiq Yunus, and Lewi Lewi. "Pengaruh Kelengkungan Sudu Terhadap Kinerja Turbin Angin Savonius." INTEK: Jurnal Penelitian 6, no. 2 (November 12, 2019): 139. http://dx.doi.org/10.31963/intek.v6i2.1578.
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Savonius wind turbine is one of the wind turbines that is more widely used for low energy needs, with more energy needs, this turbine type is very feasible to be developed. This research aims to improve the performance of Savonius wind turbines with variations in turbine blade curvature and variations in wind speed. The research method is a laboratory experiment on the fan test, the blade curvature test variation is 1R; 1.5R and 2R, another variation is the wind speed which are 4.0; 5.5; 7.0 and 8.5 m/s. The experiement results shows that the greater the wind speed, the input power, air mass flow velocity, power output, and efficiency will be even greater; the greater the load force on the turbine shaft, the torque on the turbine shaft will also be greater; the relationship of force loads to power output and turbine efficiency is to construct a parabolic curve; for the same wind speed, the 2R turbine has the lowest rotation, power output and efficiency compared to the 1R and 1.5R turbines; at the same wind speed the 1R turbine produces a higher rotation but requires lower torque than the 1.5R turbine; at low wind speeds (4 m / s) the 1.5R turbine has better efficiency than the 1R turbine, whereas at the high wind speed (8.5 m/s) the 1R turbine has a better efficiency than the 1.5R turbine; The maximum efficiency is obtained at 89.56% in the 1R curvature turbine with a wind speed of 8.5 m / s.
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Khudri Johari, Muhd, Muhammad Azim A Jalil, and Mohammad Faizal Mohd Shariff. "Comparison of horizontal axis wind turbine (HAWT) and vertical axis wind turbine (VAWT)." International Journal of Engineering & Technology 7, no. 4.13 (October 9, 2018): 74. http://dx.doi.org/10.14419/ijet.v7i4.13.21333.
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As the demand for green technology is rising rapidly worldwide, it is important that Malaysian researchers take advantage of Malaysia’s windy climates and areas to initiate more power generation projects using wind. The main objectives of this study are to build a functional wind turbine and to compare the performance of two types of design for wind turbine under different speeds and behaviours of the wind. A three-blade horizontal axis wind turbine (HAWT) and a Darrieus-type vertical axis wind turbine (VAWT) have been designed with CATIA software and constructed using a 3D-printing method. Both wind turbines have undergone series of tests before the voltage and current output from the wind turbines are collected. The result of the test is used to compare the performance of both wind turbines that will imply which design has the best efficiency and performance for Malaysia’s tropical climate. While HAWT can generate higher voltage (up to 8.99 V at one point), it decreases back to 0 V when the wind angle changes. VAWT, however, can generate lower voltage (1.4 V) but changes in the wind angle does not affect its voltage output at all. The analysis has proven that VAWT is significantly more efficient to be built and utilized for Malaysia’s tropical and windy climates. This is also an initiative project to gauge the possibility of building wind turbines, which could be built on the extensive and windy areas surrounding Malaysian airports.
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Jamal, Jamal. "Pengaruh Jumlah Sudu Terhadap Kinerja Turbin Savonius." INTEK: Jurnal Penelitian 6, no. 1 (May 25, 2019): 64. http://dx.doi.org/10.31963/intek.v6i1.1127.
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Savonius wind turbines are wind turbines that canoperate at low wind speeds, this type of turbine is very suitable tobe used in several places in Indonesia. The research aims toimprove the performance of the Savonius wind turbine withvariations in the number of turbine blades as well as variations inthe velocity of wind speed. The research method wasexperimental where wind turbine testing was carried out withvariations in the number of turbine blades with number of 2, 3and 4 blades, other variations carried out were wind speed at 3.5;4,5; 5.5 and 6.5 m/s. The study results show that the 2-bladeturbine produces greater rotation, but the torque moment islower than the 3 and 4 blade turbines, this can be seen in the lowefficiency of the 2 blade turbine at low wind speeds with highloading. At 3.5 m / s wind turbines 2 blade turbines haveefficiency that tends to be the same as 3 and 4 blade turbines upto 0.5 N but at loads of 0.6 - 1.2 N 2 blade turbines have lowerefficiency, while at wind speeds of 4.5 - 6.5 m / s 2 blade turbineshave greater efficiency than turbines 3 and 4 blades up to a loadof 1.2 N but if the load is added then the efficiency of 2-bladeturbines can be smaller than efficiency 3 and 4-blade.
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Kurniawati, Diniar Mungil. "Investigasi Performa Turbin Angin Crossflow Dengan Simulasi Numerik 2D." JTT (Jurnal Teknologi Terpadu) 8, no. 1 (April 27, 2020): 7–12. http://dx.doi.org/10.32487/jtt.v8i1.762.
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Wind turbine is a solution to harness of renewable energy because it requires wind as the main energy. Wind turbine work by extracting wind energy into electrical energy. Crossflow wind turbine is one of the wind turbines that are developed because it does not need wind direction to produce maximum efficiency. Crossflow wind turbines work with the concept of multiple interactions, namely in the first interaction the wind hits the first level of turbine blades, then the interaction of the two winds, the remainder of the first interaction enters the second level blades before leaving the wind turbine. In the design of crossflow wind turbine the diameter ratio and slope angle are important factors that influence to determine of performance in crossflow wind turbine. In this study varied the angle of slope 90 ° and variations in diameter ratio of 0.6 and 0.7. The study aimed to analyze the effect of diameter ratio and slope angle in performance of the crossflow wind turbine. This research was conducted with numerical simulation through 2D CFD modeling. The results showed that the best performance of crossflow wind turbine occurred at diameter ratio variation 0.7 in TSR 0.3 with the best CP value 0.34.
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Valiev, M., R. Stepanov, V. Pakhov, M. Salakhov, V. Zherekhov, and G. N. Barakos. "Analytical and experimental study of the integral aerodynamic characteristics of low-speed wind turbines." Aeronautical Journal 118, no. 1209 (November 2014): 1229–44. http://dx.doi.org/10.1017/s0001924000009957.
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Abstract This paper proposes a new wind turbine concept suitable for low-speed winds. The design is studied using a combination of wind-tunnel experimentation and aerodynamic theory. After processing the experimental results, and after comparison with theory, the optimal conditions for the operation of the turbine are identified. Experimental and theoretical results suggest that the design offers a realistic alternative to conventional horizontal axis wind turbines. In addition, the proposed turbine has good power efficiency at low wind speeds, and is suitable for deployment in areas not yet favoured by wind farm developers.
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He, Yi Ming, and Xian Yi Qian. "Design of Wind Power Turbine's Main Components and Computation of its Output Power." Applied Mechanics and Materials 195-196 (August 2012): 23–28. http://dx.doi.org/10.4028/www.scientific.net/amm.195-196.23.
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We have mainly studied the main structure of wind power turbines components in accordance with the principle aerodynamics. We also have taken horizontal axis wind power turbine for example and studied the basic structure and producing technology about wheel, base and other equipments. We have computed the wind power turbines output power and efficiency, and compared with some kinds of different wind power turbines output power and efficiency. All what have studied is important to design wind power turbine.
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de, Risi, Marco Milanese, Gianpiero Colangelo, and Domenico Laforgia. "High efficiency nanofluid cooling system for wind turbines." Thermal Science 18, no. 2 (2014): 543–54. http://dx.doi.org/10.2298/tsci130316116d.
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The efficiency of cooling system is critical for wind turbines, particularly during the hot season, when high temperatures could damage the electric generator and mechanical parts of the turbine. The cooling system proposed in this paper is able to increase the efficiency of heat transfer with the use of nanofluids and the wind turbine tower as a heat exchanger to dissipate waste heat in the environment. In this study the use of Al2O3-water nanofluids has been considered. The results of this investigation appear encouraging because they have shown that the proposed new solution is able to assure highly efficient heat transfer and to limit thermal stresses on the electrical and mechanical components of wind turbines.
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Kosasih, Bu Yung, and S. A. Jafari. "High-Efficiency Shrouded Micro Wind Turbine for Urban-Built Environment." Applied Mechanics and Materials 493 (January 2014): 294–99. http://dx.doi.org/10.4028/www.scientific.net/amm.493.294.
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Shrouding (diffuser augmented) horizontal axis micro-wind turbine has been shown to be an effective ways to potentially increase the power output of micro wind turbine for applications in built environments. It is well understood that the degree of the performance enhancement depends on several factors including the diffuser shape and geometries, blade airfoils, and the wind condition at the turbine site. The effect of diffuser shape and geometries is reported in this paper. Computational fluid dynamic (CFD) simulations of a small wind turbine with a simple frustum diffuser shrouding have been carried out. The diffuser has been modeled with different shapes with the aim to understand the effect of length and area ratio on power augmentation phenomenon. The simulations provide some parameterized figures which present method to determine the beneficial range of frustum diffuser geometries for diffuser shrouded horizontal axis wind turbines.
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Zalewska, Justyna, Krzysztof Damaziak, and Jerzy Malachowski. "An Energy Efficiency Estimation Procedure for Small Wind Turbines at Chosen Locations in Poland." Energies 14, no. 12 (June 21, 2021): 3706. http://dx.doi.org/10.3390/en14123706.
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Contrary to the extensive amount of research on large wind turbines, substantial analyses of small wind turbines are still rare. In the present study, the wind energy potential of three locations in Poland is analyzed using real wind data from a five-year period and the parameters of the selected turbine model. Appropriate simulations are performed to assess the energy efficiency of the analyzed investments at a coastal, foothill, or lowland site. According to the results, the most favorable location for a small wind turbine is the coastal site (wind zone I). The payback time at this location is approximately 13 years, whereas the payback times at the other two analyzed are more than 3 times longer. The payback periods for the latter locations significantly exceed the estimated lifetime of the wind turbine, ruling out their economic viability. The cost of electricity generation varies greatly, from 0.16 EUR/kWh at the coastal location to 0.71 EUR/kWh at the lowland location. These results provide a reference for developing more efficient solutions, such as the use of a turbine with a shielded rotor, which can increase the power of the turbine by approximately 2.5 times.
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Rajaram Narayanan, M., S. Nallusamy, and M. Ragesh Sathiyan. "Design and Analysis of a Wind Turbine Blade with Dimples to Enhance the Efficiency through CFD with ANSYS R16.0." MATEC Web of Conferences 207 (2018): 02004. http://dx.doi.org/10.1051/matecconf/201820702004.
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In the global scenario, wind turbines and their aerodynamics are always subjected to constant research for increasing their efficiency which converts the abundant wind energy into usable electrical energy. In this research, an attempt is made to increase the efficiency through the changes in surface topology of wind turbines through computational fluid dynamics. Dimples on the other hand are very efficient in reducing air drag as is it evident from the reduction of drag and increase in lift in golf balls. The predominant factors influencing the efficiency of the wind turbines are lift and drag which are to be maximized and minimized respectively. In this research, surface of turbine blades are integrated with dimples of various sizes and arrangements and are analyzed using computational fluid dynamics to obtain an optimum combination. The analysis result shows that there is an increase in power with about 15% increase in efficiency. Hence, integration of dimples on the surface of wind turbine blades has helped in increasing the overall efficiency of the wind turbine.
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Hetyei, Csaba, and Ferenc Szlivka. "COUNTER-ROTATING DUAL ROTOR WIND TURBINE LAYOUT OPTIMISATION." Acta Polytechnica 61, no. 2 (April 30, 2021): 342–49. http://dx.doi.org/10.14311/ap.2021.61.0342.
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General energy demand is continuously increasing, thus the energy generating assets need to be optimised for higher efficiency. Wind turbines are no exception. Their maximum efficiency can be determined on a theoretical basis. The limit is approached by researches day by day, utilizing the latest developments in airfoil design, blade structure and new and improved ideas in conventional and unconventional wind turbine layouts. In this paper, we are reviewing the conventional and unconventional wind turbines and their place in smart cities. Then, an unconventional wind turbine design, the CO-DRWT (counter-rotating dual rotor wind turbine) is analysed with a CFD (computational fluid dynamics) code, varying the axial and radial distances between the two turbines. After the simulations, the power coefficients for the different turbine configurations is calculated. At the end of this paper, the simulations results are summarized and consequences are drawn for the CO-DRWT layouts.
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Carullo, Alessio, Alessandro Ciocia, Gabriele Malgaroli, and Filippo Spertino. "An Innovative Correction Method of Wind Speed for Efficiency Evaluation of Wind Turbines." ACTA IMEKO 10, no. 2 (June 29, 2021): 46. http://dx.doi.org/10.21014/acta_imeko.v10i2.1037.
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The performance of horizontal axis Wind Turbines (WTs) is strongly affected by the wind speed entering in their rotor. Generally, this quantity is not available, because the wind speed is measured on the nacelle behind the turbine rotor, providing a lower value. Therefore, two correction methods are usually employed, requiring two input quantities: the wind speed on the back of the turbine nacelle and the wind speed measured by a meteorological mast close to the turbines under analysis. However, the presence of this station in wind farms is rare and the number of WTs in the wind farm is high. This paper proposes an innovative correction, named “Statistical Method” (SM), that evaluates the efficiency of WTs by estimating the wind speed entering in the WTs rotor. This method relies on the manufacturer power curve and the data measured by the WT anemometer only, thus having the possibility to be also applied in wind farms without a meteorological station. The effectiveness of such a method is discussed by comparing the results obtained by the standard methods implemented on two turbines (rated power = 1.5 MW and 2.5 MW) of a wind power plant (nominal power = 80 MW) in Southern Italy.
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Shyu, Lih Shyng. "A Pilot Study of Vertical-Axis Turbine Wind Farm Layout Planning." Advanced Materials Research 953-954 (June 2014): 395–99. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.395.
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The purpose of this study is to investigate the parameters that affect the cost-effectiveness of wind farm land use and wind energy harvesting efficiency. The research team applies two reverse rotating vertical-axis wind turbines (VAWTs) to explore how wind speed and various distances of wind turbines affect the operation efficiency of a prospective wind farm. A data acquisition system has been constructed to record the wind speed along with a variety of wind turbine output data in a wind tunnel test in order to identify the layout that help to achieve the best wind harvesting efficiency. The layout is then applied in the field test for further observation and data collection. The experiment results show 1) when two VAWTs are moved toward each other (from 300 cm to 180 cm), both turbines observe performance gain, and 2) when two VAWTs are set at a distance of 1.5 to 2.0 times the turbine diameter, the performance of both units increases by about 11% over the efficiency obtainable by their stand-alone counterpart.
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Astolfi, Davide, Francesco Castellani, and Francesco Natili. "Wind Turbine Yaw Control Optimization and Its Impact on Performance." Machines 7, no. 2 (June 11, 2019): 41. http://dx.doi.org/10.3390/machines7020041.
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The optimization of wind energy conversion efficiency has been recently boosting the technology improvement and the scientific comprehension of wind turbines. In this context, the yawing behavior of wind turbines has become a key topic: the yaw control can actually be exploited for optimization at the level of single wind turbine and of wind farm (for example, through active control of wakes). On these grounds, this work is devoted to the study of the yaw control optimization on a 2 MW wind turbine. The upgrade is estimated by analysing the difference between the measured post-upgrade power and a data driven model of the power according to the pre-upgrade behavior. Particular attention has therefore been devoted to the formulation of a reliable model for the pre-upgrade power of the wind turbine of interest, as a function of the operation variables of all the nearby wind turbines in the wind farm: the high correlation between the possible covariates of the model indicates that Principal Component Regression (PCR) is an adequate choice. Using this method, the obtained result for the selected test case is that the yaw control optimization provides a 1% of annual energy production improvement. This result indicates that wind turbine control optimization can non-negligibly improve the efficiency of wind turbine technology.
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Sontakke, Kishor, Samir Deshmukh, and Sandip Patil. "Potential of Shrouded Micro Wind Turbine." IRA-International Journal of Technology & Engineering (ISSN 2455-4480) 7, no. 2 (S) (July 10, 2017): 340. http://dx.doi.org/10.21013/jte.icsesd201732.
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The growing demand for electrical energy for industrial and domestic use, coupled with the limited amount of available fossil fuel reserves and its negative effects on the environment, have made it necessary to seek alternative and renewable energy sources. The use of renewable energy is promoted worldwide to be less dependent on conventional fuels and nuclear energy. Therefore research in the field is motivated to increase efficiency of renewable energy systems. This study aimed to study potential of micro wind turbine and velocity profile through shroud for low wind speeds. Although there is a greater inclination to use solar panels because of the local weather conditions, there are some practical implications that have place the use of solar panels in certain areas to an end. The biggest problem is panel stealing. Also, in some parts of the country the weather is more appropriate to apply wind turbines. Thus, this study paying attention on the design of a new concept to improve wind turbines to be appropriate for the low wind speeds in India. The concept involves the implementation of a concentrator and diffuser to a wind turbine, to increase the power coefficient. Although the wind turbine was not tested for starting speeds, the realization of the shroud should contribute to improved starting of the wind turbine at lower wind speeds. The configuration were not manufactured, but simulated with the use of a program to obtain the power production of the wind turbine over a range of wind speeds. These values were compared to measured results of an open wind turbine developed. The most important topic at hand when dealing with a shrouded wind turbine is to find out if the overall diameter or the blade diameter of the turbine should be the point of reference. As the wind turbine is situated in a shroud that has a larger diameter than the turbine blades, some researchers believe that the overall diameter should be used to calculate the efficiency. The benefits of shrouded wind turbines are discussed.
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Kuwana, Anna, Xue Yan Bai, Dan Yao, and Haruo Kobayashi. "Numerical Simulation for the Starting Characteristics of a Wind Turbine." Advanced Engineering Forum 38 (November 2020): 215–21. http://dx.doi.org/10.4028/www.scientific.net/aef.38.215.
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There are many types of wind turbine. Large propeller-type wind turbines are used mainly for large wind farms and offshore wind power generation. Small vertical-axis wind turbines (VAWTs) are often used in distributed energy systems. In previous studies on wind turbines, the basic characteristics such as torque coefficient have often been obtained during rotation, with the turbine rotating at a constant speed. Such studies are necessary for the proper design of wind turbines. However, it is also necessary to conduct research under conditions in which the wind direction and wind speed change over time. Numerical simulation of the starting characteristics is carried out in this study. Based on the flow field around the wind turbine, the force required to rotate the turbine is calculated. The force used to stop the turbine is modeled based on friction in relation to the bearing. Equations for the motion of the turbine are solved by their use as external force. Wind turbine operation from the stationary state to the start of rotation is simulated. Five parameters, namely, blade length, wind turbine radius, overlap, gap, and blade thickness, are changed and the optimum shape is obtained. The simulation results tend to qualitatively agree with the experimental results for steadily rotating wind turbines in terms of two aspects: (1) the optimal shape has an 20% overlap of the turbine radius, and (2) the larger the gap, the lower the efficiency.
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Charhouni, Naima, Mohammed Sallaou, and Khalifa Mansouri. "Design Analysis of Critical Concepts Influence Wind Farm Production and Efficiency." International Journal of Engineering Research in Africa 40 (December 2018): 136–50. http://dx.doi.org/10.4028/www.scientific.net/jera.40.136.
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Wind farm deficiency caused by wake turbine interactions has received an important attention by scientific researchers in recent years. However the quality of power production is strongly depends on wind turbines location from others. In this regard, this paper proposes a comprehensive design analysis of crucial concepts that aid to plan for an efficient wind farm design. Indeed, the wake modeling problem is addressed in this analysis by comparing three models with available measured data gotten from literature. A configuration of wind turbines placement within the offshore wind farm as a function of separation distance is investigated in this study considering four wind farms layout. In addition to these elements, four rotor diameters size are evaluated as critical concept for wind turbine selection and production .The results obtained demonstrate that it is complicated to make a balance between three conflicted objectives related to the power production, efficiency and surface land area required for wind farm as a function of these crucial concepts.
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Knysh, L. I. "ON POTENTIAL OF USING WIND TURBINES WITH COAXIAL WIND ROTORS FOR AUTONOMOUS POWER SUPPLY." Alternative Energy and Ecology (ISJAEE), no. 25-30 (December 7, 2018): 25–33. http://dx.doi.org/10.15518/isjaee.2018.25-30.025-033.
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The paper presents the experimental research results for the horizontal-axis wind turbine with coaxial wind rotors. It is assumed that such coaxial layout of the wind turbine can be used for designing of the wind energy systems with relatively low capacity and limited location area since the coaxial systems have advantages in overall dimensions and maximum using of the swept area. Possibility of coaxial horizontal-axis wind turbines usage is determined by positive or negative effect of turbines on each other. Literature review shows that closely spaced wind turbines can generally improve flow characteristics under certain conditions and consequently increase wind energy system efficiency. We have carried out the experiments in T-5 wind tunnel with two coaxial model two-bladed wind turbines which rotate in opposite directions. The generator of the first turbine and first turbine itself are located on the same shaft in the test section of wind tunnel. The second generator is in a lower compartment of the experimental setup and is connected by the transmission. We have measured the dynamic, energy and frequency characteristics of wind energy systems based on created experimental setup. A Pitot tube and automatic metering devises have measured the dynamic parameters and energy performance respectively. A frequency counter has saved all of the data obtained with the laser frequency measurement technique. The experiment has some specific technical features so the data received need to be corrected. The coaxial wind turbine power has decreased in comparison to isolated wind turbine at low wind speed. The return flows reinforce turbulence so wind speed falls. If wind speed increases, the impact of the return flows decreases, the coaxial wind turbine capacity significantly grows and exceeds isolated turbine capacity. The possibility of using wind turbines with coaxial wind rotors for autonomous power supply is shown. Such wind turbines are perspective and require more detailed analysis.
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., Albi, M. Dev Anand, and G. M. Joselin Herbert. "Aerodynamic Analysis on Wind Turbine Aerofoil." International Journal of Engineering & Technology 7, no. 3.27 (August 15, 2018): 456. http://dx.doi.org/10.14419/ijet.v7i3.27.17997.
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The aerofoils of wind turbine blades have crucial influence on aerodynamic efficiency of wind turbine. There are numerous amounts of research being performed on aerofoils of wind turbines. Initially, I have done a brief literature survey on wind turbine aerofoil. This project involves the selection of a suitable aerofoil section for the proposed wind turbine blade. A comprehensive study of the aerofoil behaviour is implemented using 2D modelling. NACA 4412 aerofoil profile is considered for analysis of wind turbine blade. Geometry of this aerofoil is created using GAMBIT and CFD analysis is carried out using ANSYS FLUENT. Lift and Drag forces along with the angle of attack are the important parameters in a wind turbine system. These parameters decide the efficiency of the wind turbine. The lift force and drag force acting on aerofoil were determined with various angles of attacks ranging from 0° to 12° and wind speeds. The coefficient of lift and drag values are calculated for 1×105 Reynolds number. The pressure distributions as well as coefficient of lift to coefficient of drag ratio of this aerofoil were visualized. The CFD simulation results show close agreement with those of the experiments, thus suggesting a reliable alternative to experimental method in determining drag and lift.
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Wang, Wei Na, Ru Mei Li, Yong Duan Song, Yong Sheng Hu, and Xub Kui Zhang. "Adaptive Variable Speed Control of Wind Turbines." Advanced Materials Research 311-313 (August 2011): 2393–96. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.2393.
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The uncertain and random characteristics of wind energy make the problem of wind turbine control interesting and challenging. This work investigates an adaptive method for variable speed control of wind turbines under varying operation conditions. For fixed-speed operation of wind turbines, maximum power conversion can be achieved only at a particular wind speed, thus variable speed control of wind turbines is of practical interest in enhancing wind turbine operating efficiency over wide wind speeds. Based on the nonlinear dynamic model of wind turbine, adaptive algorithms are developed in accommodating unknown system parameter uncertainties. This method is shown to be able to achieve smooth and effective tracking of rotor angular speed to capture maximum wind energy. The effectiveness and adaptation of the proposed approach is validated via numerical simulation.
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Sukrurkdee, Nantasak, Punyawee Bumroongrads, Peerapol Sangsawat, and Chawannat Jaroenkhasemmeesuk. "Designing and Developing of Savonius Wind Turbine for Efficiency Improvement in Low-Speed Wind Sources." Journal of Clean Energy Technologies 7, no. 6 (November 2019): 77–80. http://dx.doi.org/10.18178/jocet.2019.7.6.513.
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Kirke, B. K. "Optimum Matching of Non-Electrical Loads to Wind Turbines." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 210, no. 3 (June 1996): 213–21. http://dx.doi.org/10.1243/pime_proc_1996_210_034_02.
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Improvements in technology have reduced the unit cost of wind–electric power systems by almost an order of magnitude since 1981, and installed wind power capacity is growing rapidly world-wide. Paradoxically, the use of wind-powered pumping systems, formerly the major application of wind power, is declining and little progress has been made towards the direct application of wind power to drive other mechanical loads such as aerators and compressors for heat pumps, despite huge potential markets in areas remote from electricity grids. A major reason for this failure to apply improved wind turbine technology to non-electrical loads is low system efficiency resulting from poor torque matching between the wind turbine rotor and the load. Methods of improving system efficiency are reviewed, including load-disengaging devices to permit easy starting and a simple mechanical control system for a variable ratio drive which would ensure that any wind turbine driving any load will operate near peak efficiency over the full operating range from cut-in to governing. The latter system could improve average system efficiency by a factor of 3 to 8 and has the further advantage that it can provide starting torque and can actuate overspeed control for Darrieus vertical axis wind turbines and low-solidity horizontal axis wind turbines.
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Tian, Xin Shou, Yue Hui Huang, Xiao Yan Xu, and Wei Sheng Wang. "Comparison of the Frequency Control Strategy of Wind Turbines and its Optimization Scheme." Advanced Materials Research 608-609 (December 2012): 494–99. http://dx.doi.org/10.4028/www.scientific.net/amr.608-609.494.
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In order to improve the frequency stability of grid, new control strategy for wind turbines need to be developed with high wind power penetration. This work analyzes the requirements of frequency control for wind turbines in some countries, and the characteristics and methods of typical frequency control strategy are analyzed. To meet the requirements of frequency control of wind turbine and to improve wind energy utilization efficiency, a method of optimization scheme of frequency control on wind turbine is given in the paper, and the operating curve of wind turbine with the control method is determined, at the same time this work gives a general method about how to determine some key parameters.
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Pchelnikova-Grotova, Olga. "Improving the efficiency of autonomous wind turbines." E3S Web of Conferences 279 (2021): 01023. http://dx.doi.org/10.1051/e3sconf/202127901023.
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The article discusses the development of a mathematical model of a combined wind turbine of a multi-modular wind power plant, which makes it possible to control the operation of wind turbines with the greatest efficiency, changing the operating modes of the installation depending on the wind flow entering the inlet. The implementation of the developed model at a multi-module wind station allowed us to obtain a maximum wind utilization factor of 0.35-0.47 at any wind speeds, as well as at low wind speeds to increase the initial torque of the wind wheel by 4 times in comparison with typical power plants.
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Seitenov, Daniyar, N. Mir-Nasiri, and Md Hazrat Ali. "A comparative ANSYS-based force analysis of a new horizontal-axis semi-exposed wind turbine." Wind Engineering 44, no. 4 (May 30, 2019): 410–33. http://dx.doi.org/10.1177/0309524x19852352.
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Renewable energy sources are growing fast. Nowadays, much effort has been made by inventors to devise new and more efficient configurations of wind turbines. This article describes the mechanical design and resultant force dynamic simulation of an innovative horizontal-axis semi-exposed wind turbine structure. The innovation in wind turbine structure includes the flat shape of its blades and their orientation towards the wind that minimizes the axial component of wind force on the shaft bearings. As a result, wind power is fully utilized to generate a useful rotary force that drives the generator rotor. This enhances the efficiency of the turbine as compared to complex shape blades in traditional horizontal-axis wind turbines. The distinctive feature of the system is also an oscillating shield that automatically protects the generator shaft from overspeeding at extreme wind speeds and, therefore, from generating power above its nominal capacity. The overspeeding may even cause physical damage to the generator. The force analysis of the new wind generator has been conducted for various wind conditions by using ANSYS Fluent. The results are compared to a traditional three-blade horizontal wind turbine to prove the ability of the new semi-exposed wind turbine to collect more driving torque on the shaft. The results of the simulation show the efficiency of the system and the advantage of using this system with the overspeed shield protection.
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Gorban’, Alexander N., Alexander M. Gorlov, and Valentin M. Silantyev. "Limits of the Turbine Efficiency for Free Fluid Flow." Journal of Energy Resources Technology 123, no. 4 (August 14, 2001): 311–17. http://dx.doi.org/10.1115/1.1414137.
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An accurate estimate of the theoretical power limit of turbines in free fluid flows is important because of growing interest in the development of wind power and zero-head water power resources. The latter includes the huge kinetic energy of ocean currents, tidal streams, and rivers without dams. Knowledge of turbine efficiency limits helps to optimize design of hydro and wind power farms. An explicitly solvable new mathematical model for estimating the maximum efficiency of turbines in a free (nonducted) fluid is presented. This result can be used for hydropower turbines where construction of dams is impossible (in oceans) or undesirable (in rivers), as well as for wind power farms. The model deals with a finite two-dimensional, partially penetrable plate in an incompressible fluid. It is nearly ideal for two-dimensional propellers and less suitable for three-dimensional cross-flow Darrieus and helical turbines. The most interesting finding of our analysis is that the maximum efficiency of the plane propeller is about 30 percent for free fluids. This is in a sharp contrast to the 60 percent given by the Betz limit, commonly used now for decades. It is shown that the Betz overestimate results from neglecting the curvature of the fluid streams. We also show that the three-dimensional helical turbine is more efficient than the two-dimensional propeller, at least in water applications. Moreover, well-documented tests have shown that the helical turbine has an efficiency of 35 percent, making it preferable for use in free water currents.
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N.A, Prashanth, and P. Sujatha. "Commonly Used Wind Generator Systems: A Comparison Note." Indonesian Journal of Electrical Engineering and Computer Science 7, no. 2 (August 1, 2017): 299. http://dx.doi.org/10.11591/ijeecs.v7.i2.pp299-311.
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<p>Amongst all renewable energy generation sources, wind power exhibits fastest growth rate. The increasing number of wind farm installations worldwide demand low maintenance, cost and failure rates with high efficiency. Determining the optimal drive train configuration amongst various configurations available for wind turbines is a challenge. In this paper commonly used, doubly fed induction generator with single stage gear box (GDFIG), doubly fed induction generator with multi stage gear box (DFIG) and the direct-drive permanent-magnet generator (DDPMG) are compared. Modelling of wind turbine with efficiency computations is presented. Considering common wind turbine parameters, performance of GDFIG, DFIG and DDPMG is compared through an experimental study. Considering a reference 5 MW variable speed wind turbine, efficiency of DDPMG is 96% when compared to 93.58%, 93.12% for DFIG and GDFIG. The experimental results presented prove that the DDPMG is a preferable solution considering low cost and high efficiency.</p>
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Xia, Yaping, Minghui Yin, Ruiyu Li, De Liu, and Yun Zou. "Integrated structure and maximum power point tracking control design for wind turbines based on degree of controllability." Journal of Vibration and Control 25, no. 2 (June 26, 2018): 397–407. http://dx.doi.org/10.1177/1077546318783363.
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A linearization model is obtained for a three-bladed horizontal-axis wind turbine (HAWT) consisting of blades and a drive-train. Sensitivity analysis of the degree of controllability (DOC) and maximum power point tracking (MPPT) efficiency with respect to the structural parameters of wind turbines is discussed by numerical simulations. It is observed from the simulation results that higher MPPT efficiency can be achieved with the increase of DOC. Based on the observation, this paper proposes a new integrated design method based on DOC to design and optimize the structural parameters of a HAWT. The designed turbine is tested by the commercial simulation software of wind turbines named Bladed. It is observed from simulations that when using the identical MPPT control strategy, the wind turbine whose structural parameters are optimized for a larger value of DOC can achieve higher MPPT performance.
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Khozyainov, B. P. "THE WAYS TO ACHIEVE LEADERSHIP IN WIND ENERGY." Alternative Energy and Ecology (ISJAEE), no. 22-24 (November 5, 2018): 59–67. http://dx.doi.org/10.15518/isjaee.2018.22-24.059-067.
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The article provides the analysis of performance efficiency of various designs of wind turbines with a horizontal and vertical axis of rotation and reveals the advantages and disadvantages of each design and possibility of each of them to work effectively in the conditions of the wind mode of Russia. As a result, we have concluded that the wind turbines with a vertical axis of rotation using the principle of the differential front resistance are most adapted for the further development of wind energy since these wind turbines are capable to work at very small wind speeds and are more adapted for further improvement. Moreover, we have made the recommendations for removal of disadvantages and development of advantages of these wind turbines. The article offers a number of patents which can regulate the angular speed of rotation of the wind turbine, the size of the rotating moment and, accordingly, its power depending on the natural wind speed. In particular, there is a patent for a design of the blade with varying dimensions depending on the air stream; the introduction of such device will increase the aerodynamic characteristics of the blade. The use of the wind guide screens allows us to start the wind turbine at wind speed from 0.5 m/s. It promotes the effective performance in the range of wind speed from 0.5 m/s to 4.5 m/s, and the wind guide screens regulate the air stream velocity in the wind turbine volume at speed from 4.5 m/s to 15.0 m/s. At gale-force winds, the wind guide screens are capable of cover the wind turbine preventing its destruction. The use of such wind turbines will positively affect the development of wind energy in Russia.
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Li, Zheng, Wenda Zhang, Hao Dong, and Yongsheng Tian. "Performance Analysis and Structure Optimization of a Nautilus Isometric Spiral Wind Turbine." Energies 13, no. 1 (December 25, 2019): 120. http://dx.doi.org/10.3390/en13010120.
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Background: This paper proposes a Nautilus isometric spiral vertical axis wind turbine, which is a new structure, and its aerodynamic performance and power generation performance need to be analyzed. Methods: A 3D model of the wind turbine was built and its aerodynamic performance was analyzed. Then the wind turbine power generation and grid-connected simulation platform was built by MATLAB/SIMULINK, and its power generation performance and subsequent grid connection were studied. Results: The basic parameters of the wind turbine were obtained. In order to improve efficiency, parameters such as pressure, torque, wind energy utilization rate and relative velocity of wind turbines with different blade numbers and different sizes were compared. In addition, by building a simulation platform for the power generation control system, the power generation characteristics and grid connection characteristic curves of the generator were obtained. Conclusions: When the number of blades is three and the ratio between the ellipse major axis and minor axis of the blade inlet is 0.76, the best efficiency of the wind turbine can be obtained. Application of the power generation control system used in this paper can achieve grid-connected operation of this wind turbine. It also confirmed that the Nautilus isometric spiral wind turbine has good performance and is worthy of in-depth research.
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Sudargana, Sudargana, Bambang Yunianto, Abiseka M., and Teguh Priyo Utomo. "TEST CHARACTERISTICS OF THE TURBINE SAVONIUS 4 LEVELS SECTIONAL, PARTITIONED, 0.25 DIAMETER OVERLAP AND 45o SLIDING ANGLE WITH COMPARABLE STANDARD TURBINE." ROTASI 16, no. 2 (April 1, 2014): 14. http://dx.doi.org/10.14710/rotasi.16.2.14-17.
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The energy and environmental crisis where CO2 causes global warming and climate change. This condition encourage the world community take advantage of new renewable energy non-CO2 as wind, water currents, geothermal, solar, etc. Savonius Turbine has a simple construction can be made by the public so they can be used for wind power or hydro countryside. In this study aims to improve the efficiency and reduce the amplitude of vibrations to the modification of the 4-storey Savonius turbine, partitioned, sliding angle 45 degree and 0.25 diameter blade overlap. The location of research is Cokro Tulung Channel Klaten and Parangrucuk Baron Beach Gunungkidul. Measurements such as water current and wind speed, turbine rotational speed, torque of the turbine shaft and power. The turbines analysis are torque, power and efficiency characteristics and comparing by the turbine Savonius standard (one pair of blades). Results as hydro turbine at low velocity 0.3166 m/s Savonius 4 level had better revolution and efficient (0.0826) than 1 level (0.024), but as wind turbine at 3.056 m/s velocity the Savonius 4 level had worse efficiency (0.039) than 1 level (0.025) because the inertia load
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Xu, Chang, Yan Yan, De You Liu, Yuan Zheng, and Chen Qi Li. "Optimization of Wind Farm Micro Sitting Based on Genetic Algorithm." Advanced Materials Research 347-353 (October 2011): 3545–50. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.3545.
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In order to increase wind energy utilization efficiency by the optimization of the wind farm micro sitting, a method which could calculate the wind farm velocity is proposed by consideration of multi turbines wake loss and superposition. Based on the given velocity data of a wind farm, the maximal annual energy production is set as the optimal objective and the ordinates of wind turbines would be the optimal variables, micro sittings of the wind farm turbines are optimized by genetic algorithm. Layout calculation result of the optimal method is quite similar to that of other successful search method, but higher efficiency is reached, and the micro sitting layout is agreement with the regular plum-type layout. Annual energy productions are also calculated under the condition of different wind turbine number. Results show annual energy production increases with the wind turbine number increased, but the increasing trend is lower and lower. The research could provide a reference to wind farm micro-sitting.
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Kryltcov, Sergei, and Sergei Solovev. "Efficient wind energy generation within Arctic latitudes." E3S Web of Conferences 140 (2019): 11005. http://dx.doi.org/10.1051/e3sconf/201914011005.
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The paper addresses approaches to increasing the efficiency of wind turbines operating in autonomous mode in Arctic regions. Such type of wind turbine operation is related to fluctuations of the generated power, that negatively affects grid power quality. The increase of wind turbines efficiency is achieved by the utilization of current reserve of power converter, which is a necessary part of megawatts-sized wind energy generation unit. The developed Simulink model of the wind turbines, built according to two of the most suitable for megawatts-level power generation topologies, was used to determine their power output depending on the wind turbine’s rotor speed and the wind speed. Obtained power profile was then used to determine the amount of free current reserve depending on the wind speed, which has verified the ability of both wind turbine topologies to efficiently improve grid power quality, therefore leading to reduction or absence of the necessity to install additional power equipment for the compensation purpose.
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Dou, Bingzheng, Zhanpei Yang, Michele Guala, Timing Qu, Liping Lei, and Pan Zeng. "Comparison of Different Driving Modes for the Wind Turbine Wake in Wind Tunnels." Energies 13, no. 8 (April 14, 2020): 1915. http://dx.doi.org/10.3390/en13081915.
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The wake of upstream wind turbine is known to affect the operation of downstream turbines and the overall efficiency of the wind farm. Wind tunnel experiments provide relevant information for understanding and modeling the wake and its dependency on the turbine operating conditions. There are always two main driving modes to operate turbines in a wake experiment: (1) the turbine rotor is driven and controlled by a motor, defined active driving mode; (2) the rotor is driven by the incoming wind and subject to a drag torque, defined passive driving mode. The effect of the varying driving mode on the turbine wake is explored in this study. The mean wake velocities, turbulence intensities, skewness and kurtosis of the velocity time-series estimated from hot-wire anemometry data, were obtained at various downstream locations, in a uniform incoming flow wind tunnel and in an atmospheric boundary layer wind tunnel. The results show that there is not a significant difference in the mean wake velocity between these two driving modes. An acceptable agreement is observed in the comparison of wake turbulence intensity and higher-order statistics in the two wind tunnels.
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Manousakis, Nikolaos M., Constantinos S. Psomopoulos, George Ch Ioannidis, and Stavros D. Kaminaris. "A Binary Integer Programming Method for Optimal Wind Turbines Allocation." Clean Technologies 3, no. 2 (June 1, 2021): 462–73. http://dx.doi.org/10.3390/cleantechnol3020027.
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The present study introduces a Binary Integer Programming (BIP) method to minimize the number of wind turbines needed to be installed in a wind farm. The locations of wind turbines are selected in a virtual grid which is constructed considering a minimum distance between the wind turbines to avoid the wake effect. Additional equality constraints are also included to the proposed formulation to prohibit or enforce the installation of wind turbines placement at specific locations of the wind farmland. Moreover, a microscopic wind turbine placement considering the local air density is studied. To verify the efficiency of this proposal, a square site was subdivided into 25 square cells providing a virtual grid with 36 candidate placement locations. Moreover, a virtual grid with 121 vertices related with a Greek island is also tested. All simulations conducted considering the area of geographical territory, the length of wind turbine blades, as well as the capacity of each turbine.
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Castellani, Francesco, and Davide Astolfi. "Editorial on Special Issue “Wind Turbine Power Optimization Technology”." Energies 13, no. 7 (April 8, 2020): 1796. http://dx.doi.org/10.3390/en13071796.
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This Special Issue collects innovative contributions in the field of wind turbine optimization technology. The general motivation of the present Special Issue is given by the fact that there has recently been a considerable boost of the quest for wind turbine efficiency optimization in the academia and in the wind energy practitioners communities. The optimization can be focused on technology and operation of single turbine or a group of machines within a wind farm. This perspective is evidently multi-faced and the seven papers composing this Special Issue provide a representative picture of the most ground-breaking state of the art about the subject. Wind turbine power optimization means scientific research about the design of innovative aerodynamic solutions for wind turbine blades and of wind turbine single or collective control, especially for increasing rotor size and exploitation in offshore environment. It should be noticed that some recently developed aerodynamic and control solutions have become available in the industry practice and therefore an interesting line of development is the assessment of the actual impact of optimization technology for wind turbines operating in field: this calls for non-trivial data analysis and statistical methods. The optimization approach must be 360 degrees; for this reason also offshore resource should be addressed with the most up to date technologies such as floating wind turbines, in particular as regards support structures and platforms to be employed in ocean environment. Finally, wind turbine power optimization means as well improving wind farm efficiency through innovative uses of pre-existent control techniques: this is employed, for example, for active control of wake interactions in order to maximize the energy yield and minimize the fatigue loads.
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Sadikin, Azmahani, M. R. Shamsudin, and A. Wahab. "Turbulence Kinetic Energy Performance on Wind Turbine Blade Using CFD." Applied Mechanics and Materials 315 (April 2013): 523–26. http://dx.doi.org/10.4028/www.scientific.net/amm.315.523.
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Wind represents the kinetic energy of the atmosphere. Wind energy is currently supplying as much as 1% of the world electricity used, and could supply as much as 20% of global electricity in power and can be created through the use of wind turbines. Wind turbine blade is the most promising technology for the production of energy by using wind energy. Good design of wind turbine blade depends on performance of increasing to generate electricity which related with drag coefficient , lift coefficient and turbulence kinetic energy. However, the efficiency of wind turbine blade could be predicted by simulation due to flow streamline on wind turbine blade. This paper discuss the result obtain from simulation in CFD using CFX on NACA 4412 and NACA 4415.
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Rudiyanto, Rudiyanto, Eko Budiyanto, Rubi Kurniawan, and Joko Sumosusilo. "Pengaruh diameter sudu terhadap kinerja turbin angin berporos horizontal." ARMATUR : Artikel Teknik Mesin & Manufaktur 1, no. 1 (April 3, 2020): 17–24. http://dx.doi.org/10.24127/armatur.v1i1.186.
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Fossil energy is a limited and non-renewable source of energy, therefore it is necessary to look for alternative energy solutions that are not available and can be updated. Another reason is to reduce the impact of pollution caused by the use of fossil energy. As we all know, the biggest source of pollution in the world comes from exhaust gas/fossil fuel emissions. These plants can convert wind energy into electrical energy using wind turbines or windmill. The electricity generation system using wind as an energy source is an alternative system that is very rapidly developing, considering that wind is an energy that is not limited in nature. The purpose of this study was tested using three blades, varying the diameter with a slope of 150, namely to determine the effect of blade diameter on the power produced by the turbine and the efficiency of the horizontal shaft wind turbine. The turbine power testing method is done manually by using 2 spring balance which is associated with the belt, v-belt, then the v-belt is associated with an 8 cm diameter pulley that is on the turbine shaft, the friction between the belt and the pulley is ignored. From the test results, the torque produced by the turbine is carried out in a certain rotation. Wind turbines made with blade blades 2 m, 2.40 m, 2.80 m with wind speeds of 4 m / s From the three turbine blade variables based on testing different turbine blade diameter the resulting power is different, from the test results it can be known the power generated by the power turbine can be seen that the highest power on the blade diameter is 2.40 m at 140 turns (rpm) with turbine power of 19.9606 watts, with an efficiency of 10,6263 % and the lowest in blade diameter 2m in rotation 120 ( rpm) with turbine power of 12.9374 watts, with an efficiency of 9,9579 %.
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Cheng, J. C., S. J. Su, and J. J. Miau. "Application of Variable Blade Pitch Control on Improving the Performance of Vertical Axis Wind Turbine." Applied Mechanics and Materials 229-231 (November 2012): 2339–42. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.2339.
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A three blades vertical axis wind turbine simulation is performed to study the unsteady aerodynamic characteristics with blade pitch control. Several fixed and variable blade pitch models under different tip speed ratio are adopted to improve performance of the wind turbine. Results show that an appropriate pitch control model can effectively decrease the range of negative torque regime to reduce the vibration of the wind turbine. Besides, the average torque coefficient as well as the energy capture efficiency can be also improved, especially for the lower tip speed ratio. The overall efficiency of the wind turbines in power generation will be enhanced. For the cases under the tip speed ratio between 1 and 3, the efficiency can be enhanced 243% and 486% for fixed and variable pitch control models respectively as comparing with non-pitch control cases.
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Astolfi, Davide, Francesco Castellani, Francesco Berno, and Ludovico Terzi. "Numerical and Experimental Methods for the Assessment of Wind Turbine Control Upgrades." Applied Sciences 8, no. 12 (December 16, 2018): 2639. http://dx.doi.org/10.3390/app8122639.
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Megawatt-scale wind turbine technology is nowadays mature and, therefore, several technical improvements in order to optimize the efficiency of wind power conversion have been recently spreading in the industry. Due to the nonstationary conditions to which wind turbines are subjected because of the stochastic nature of the source, the quantification of the impact of wind turbine power curve upgrades is a complex task and in general, it has been observed that the efficiency of the upgrades can vary considerably depending on the wind flow conditions at the microscale level. In this work, a test case of wind turbine control system improvement was studied numerically and through operational data. The wind turbine is multi-megawatt; it is part of a wind farm sited in a complex terrain in Italy, featuring 17 wind turbines. The analyzed control upgrade is an optimization of the revolutions per minute (rpm) management. The impact of this upgrade was quantified through a method based on operational data: It consists of the study, before and after the upgrade, of the residuals between the measured power output of the wind turbine of interest and an appropriate model of the power output itself. The input variables for the model were selected to be some operational parameters of the nearby wind turbines: They were selected from the data set at disposal with a stepwise regression algorithm. This work also includes a numerical characterization of the problem, by means of aeroelastic simulations performed with the FAST software: By mimicking the pre- and post-upgrade generator rpm–generator torque curve, it is subsequently possible to estimate how the wind turbine power curve changes. The main result of this work is that the two estimates of production improvement have the same order of magnitude (1.0% of the production below rated power). In general, this study sheds light on the perspective of employing not only operational data, but also a sort of digital replica of the wind turbine of interest, in order to reliably quantify the impact of control system upgrades.
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Bensaber, Abdelhaq Amar, Mustapha Benghanem, Mohammed Amar Bensaber, and Abdelmadjid Guerouad. "Nonlinear Adaptive Control for Wind Turbine Under Wind Speed Variation." IAES International Journal of Robotics and Automation (IJRA) 7, no. 2 (June 1, 2018): 87. http://dx.doi.org/10.11591/ijra.v7i2.pp87-95.
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<span>Wind turbines components work as nonlinear systems where electromechanical parameters change frequently [1], which makes nonlinear control an interesting solution to prevail good efficiency. SMC has been largely used in electrical power applications because it offers interesting features like robustness to parametric uncertainties and external disturbances, to conquer the biggest drawback of the SMC, adaptation strategy consists on updating the sliding gain and the turbine torque to contribute with some important characteristics such as chatter-free performance, heftiness, robustness and secure power system operation. Matlab tests are introduced and compared.</span>
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Bensaber, Abdelhaq Amar, Mustapha Benghanem, Mohammed Amar Bensaber, and Abdelmadjid Guerouad. "Nonlinear Adaptive Control for Wind Turbine Under Wind Speed Variation." IAES International Journal of Robotics and Automation (IJRA) 7, no. 2 (June 1, 2018): 89. http://dx.doi.org/10.11591/ijra.v7i2.pp89-95.
Full textAbstract:
<span>Wind turbines components work as nonlinear systems where electromechanical parameters change frequently [1], which makes nonlinear control an interesting solution to prevail good efficiency. SMC has been largely used in electrical power applications because it offers interesting features like robustness to parametric uncertainties and external disturbances, to conquer the biggest drawback of the SMC, adaptation strategy consists on updating the sliding gain and the turbine torque to contribute with some important characteristics such as chatter-free performance, heftiness, robustness and secure power system operation. Matlab tests are introduced and compared.</span>
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Buckney, Neil, Alberto Pirrera, Steven D. Green, and Paul M. Weaver. "Structural efficiency of a wind turbine blade." Thin-Walled Structures 67 (June 2013): 144–54. http://dx.doi.org/10.1016/j.tws.2013.02.010.
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Le, Vinh Thanh. "Wind potential assessment and optimized turbine distribution in wind farm using WAsP and WindPRO software." Science & Technology Development Journal - Engineering and Technology 2, no. 3 (January 22, 2020): 131–39. http://dx.doi.org/10.32508/stdjet.v2i3.433.
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In order to develop a wind farm project, the wind potential assessment and siting wind turbine are very important. It directly impacts energy production – a huge influence on the economic efficiency of the wind farm project. So, this paper presents the method to assess wind potential and optimized turbine distribution in Vietnam's offshore wind farm site, based on data from the met mast of GIZ organization (2012 - 2017) at An Ninh Dong commune, Tuy An district, Phu Yen province. The paper presents wind statistics theory from measured data through Weibull function. Comparing the short-term and long-term wind data (from meso-scale data sources – NASA, Hydrometeorological Station ...) is done by module MCP (Measure-Correlate-Predict). Wind potential is assessed when considering the effects of elevation and terrain roughness from wind data that has been long-term adjusted through WAsP and WindPRO software. Jensen model assesses the effects of wake loss between the turbines. The method calculates the power output of the wind farm when considering the influence of turbines is presented, as well as the algorithm of optimized turbine distribution. The optimized turbine distribution is done through WindPRO software. Finally, the turbine distribution results are presented with wind potential has been assessed and the input constraints of optimization.
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R. KARTHIKEYAN, S. KALAIVANI, C. THARINI, A. M. AZARUDEEN,. "IoT BASED SMART AND EFFICIENT WIND TURBINE MONITORING SYSTEM." INFORMATION TECHNOLOGY IN INDUSTRY 9, no. 1 (March 18, 2021): 1205–12. http://dx.doi.org/10.17762/itii.v9i1.256.
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Wind Turbine industry has the improved latest generation of Wind turbines with bigger flexible blades, high tower, Good efficiency & low cost repairing in all platforms of wind turbines from Small wind mills to Ocean wind turbines. The Control centre is responsible for Monitoring and Controlling wind turbines in wind power farms. Various parameters like Oil level, Gas leakage, air pressure, vibrations & linear velocity, environmental condition like rain & humidity are to be monitored and controlled for proper working of the wind turbines. In the proposed work, smart and efficient turbine network architecture is designed to automate this process. The aim of the proposed work is to monitor the different parameters of the turbine using respective sensors. The acquired sensor data are uploaded to the cloud via WiFi module for online monitoring and further data analysis. IFTTT Server of Adafruit io cloud is used to send the warning notification of the critical sensor value to the concerned person. Also the sensor node life time is taken care by implementing a proposed compression algorithm in each node that reduces the amount of data transmitted and thereby the energy consumed during transmission.
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Bazrafshan, Jafar, Payam Sabaeifard, Farid Khalafi, and Majid Jamil. "CFD Calculation of Wind Turbines Power Variations in Urban Areas." Advanced Materials Research 622-623 (December 2012): 1084–88. http://dx.doi.org/10.4028/www.scientific.net/amr.622-623.1084.
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Integrating wind turbines in urban areas especially over buildings is a new way of producing electricity which is supported in recent years. Wind turbines sited well above the roof of buildings operate in skewed flow. In this paper, to examine variations in efficiency of wind turbines in this condition, two models of H-Rotor and horizontal axis wind turbine analyzed based on axial momentum theory through computer simulations. Simulations conducted through CFD method and k-ε turbulence model was utilized to analyze flow fluctuations in Navier-Stokes equations. Models show that, for an H-Rotor, the optimal power output in tilted flow can be up to two times the power output of horizontal axis wind turbine (HAWT).
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Shun, Yang, and Li Da Zhang. "A Novel Generator Side Converter Control Scheme of Direct Driven PMSG Wind Turbine." Advanced Materials Research 631-632 (January 2013): 1095–100. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.1095.
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With the advance of electronic technology,the filed-oriented control of voltage space vector PWM have become more efficient in generator side converter control.This paper presented the direct driven wind turbine model and the permanent magnet synchronous generator (PMSG) model in synchronous rotating d-q reference frame.Using filed-oriented control of voltage space vector PWM in generator side converter control for enhance efficiency. The optimal control strategy can keep wind turbine working at optimal tip speed ratio for capture maximum wind power.A novel nonlinear PI controller for anti-windup implemented in control loop for highest efficiency of wind turbine which can be reached.Simulation results verified and shown via Matlab/Simulink that the performance of nonlinear PI controller for anti-windup in generator side converter control system is better than traditional PI controller in control loop for wind turbines.
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Saleh, M., and Ferenc Szodrai. "Numerical Model Analysis of Myring–Savonius wind turbines." International Journal of Engineering and Management Sciences 4, no. 1 (March 3, 2019): 180–85. http://dx.doi.org/10.21791/ijems.2019.1.23.
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Nowadays the importance of renewable energy is growing, and the utilization of the low wind energy potential is getting crucial. There are turbines with low and high tip speed ratio. Turbines with low tip speed ratio such as the Savonius wind turbine can generate adequate amount of torque at low wind velocities. These types of turbines are also called drag machines. The geometry of the blade can greatly influence the efficiency of the device. With Computational Fluid Dynamics (CFD) method, several optimizations can be done before the production. In our paper the Savonius wind turbine blade geometry was based on the so-called Myring equation. The primary objective of this paper was to increase the power coefficient by modelling the effect of the wind on the turbine blade. For the sake of simplicity, a 2D cross-sectional area was investigated in the simulation with ANSYS CFX 19.1.