共查询到20条相似文献,搜索用时 93 毫秒
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扩压风道型建筑风能利用的探讨 总被引:1,自引:0,他引:1
根据扩散型风力机的原理,构想了一种新型风能利用建筑型式--扩压风道型建筑.探讨了扩压风道型建筑的特点,并对影响其风能利用的扩散角α、建筑尺寸、来流偏向角β等因素进行了数值模拟.通过分析可以看出,扩压风道型建筑能够强化风速及风能密度,是一种有效的风能集结建筑. 相似文献
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针对传统的立轴风力机风能利用率低的问题,应用正交优化法和流场数值模拟技术对聚风导流型立轴风力机的结构设计参数进行了优化设计。在同尺度下与传统立轴风力机进行了对比分析。结果表明,聚风导流型立轴风力机叶轮的输出功率、风能利用率及自启动特性均得到了显著提高。 相似文献
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Wind power in China registered a record level of expansion recently, and has doubled its total capacity every year since 2004. Many experts believe that China will be central to the future of the global wind energy market. Consequently, the growth pattern of wind power in China may be crucial to the further development of the global wind market. This paper firstly presented an overview of wind energy potential in China and reviewed the national wind power development course in detail. Based on the installed wind capacity in China over the past 18 years and the technical potential of wind energy resources, the growth pattern was modeled in this study for the purpose of prospect analysis, in order to obtain projections concerning the development potential. The future perspectives of wind energy development in China are predicted and analyzed. This study provides a comprehensive overview of the current status of wind power in China and some insights into the prospects of China's wind power market, which is emerging as a new superpower in the global wind industry. 相似文献
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分布式风-光互补能源利用系统 总被引:2,自引:0,他引:2
提出充分利用风能和太阳能的互补性,设计了风能和太阳能联合供能系统在运行中能量产生、储备、利用等各个环节的工作方式,实现可靠、高效地运行,为用户提供了生活用电与供热。该系统很好地利用了风-光可再生资源在季节、天气、地域上的互补性,可拓展风能和太阳能经济利用的范围。该系统在风-光丰富的广大农村地区具有很好的应用和发展前景。 相似文献
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《Renewable & Sustainable Energy Reviews》2008,12(6):1745-1757
In India, the wind power generation has gained a high level of attention and acceptability compared to other renewable energy technologies. New technological developments in wind power design have contributed for the significant advances in wind energy penetration and to get optimum power from available wind. The yearly percentage increase in wind energy installation is highest for India and now ranks fourth in the world with an installed capacity of 6018 MW. This paper reviews the development of wind energy in India and five potential Indian states. The future growth pattern and time period to achieve the technical wind potential are predicted and analysed. 相似文献
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Characteristics of wind speed data for three recent years, recorded at 14 stations of the Bangladesh Meteorological Department, have been studied. The data have been used to compute the monthly average wind speed and the wind energy availability for the stations. Average values of monthly wind speed for 1931–1960 have been employed to obtain the energy availability from the energy pattern factor, and the two sets of results have been compared. It has been found that, for the Chittagong station, the frequency distributions have good fits of the Weibull type. 相似文献
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提出了一种适合任意风向的新型聚能-遮蔽型立轴风力机,并应用计算流体力学方法,对这种风力机的气动性能进行了数值模拟.研究表明:这种新型立轴风力机比传统的立轴风力机的风能利用率有显著提高.此外,该文还采用了正交优化设计方法,对这种立轴风力机的结构参数进行了优化设计,得到了一组最优的设计参数,该最优设计参数下风力机的风能利用率达37%. 相似文献
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Two-parameter Weibull function has been widely applied to evaluate wind energy potential. In this paper, six kinds of numerical methods commonly used for estimating Weibull parameters are reviewed; i.e. the moment, empirical, graphical, maximum likelihood, modified maximum likelihood and energy pattern factor method. Their performance is compared through Monte Carlo simulation and analysis of actual wind speed according to the criterions such as Kolmogorov–Smirnov test, parameter error, root mean square error, and wind energy error. The results show that, in simulation test of random variables, the graphical method’s performance in estimating Weibull parameters is the worst one, followed by the empirical and energy pattern factor methods, if data number is smaller. The performance for all the six methods is improved while data number becomes larger; the graphical method is even better than the empirical and energy pattern factor methods. The maximum likelihood, modified maximum likelihood and moment methods present relatively more excellent ability throughout the simulation tests. From analysis of actual data, it is found that if wind speed distribution matches well with Weibull function, the six methods are applicable; but if not, the maximum likelihood method performs best followed by the modified maximum likelihood and moment methods, based on double checks including potential energy and cumulative distribution function. 相似文献
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This paper presents the application of a new approach for taking into consideration the variability of the wind resource at different temporal scales (hourly, daily, seasonal, annual) in generating scenarios for energy systems modelling. It is argued that Markov models and auto-regressive models, generally used for synthetic wind speed data generation, do not contain sufficient low-frequency information related to seasonal and diurnal patterns. Under high wind penetration scenarios, the daily pattern of the wind becomes increasingly important to energy system modelling and design. Statistical analysis of various wind locations in the Azores, Portugal, indicates that there are strong seasonal differences in magnitude and shape within a given day that will affect energy system design and performance. The proposed methodology evaluates the frequency of different wind day types, such as afternoon winds or morning winds, along with the magnitude of wind for locations with different quality wind resources. Application of the new methodology indicates that the inclusion of diurnal wind characteristics for the analysis of future energy systems provides better design information, especially as it pertains to generation investment requirements to meet island specific renewable penetration targets, and intra-day surpluses or shortages of wind generation in small energy networks. 相似文献
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Potential for wind generation on the Guyana coastlands 总被引:1,自引:0,他引:1
Guyanas dependence upon imported petroleum fuels can only be offset by the sustained exploitation of its indigenous resources. With its populated coastlands exposed to the northeast trade winds and a history of small-scale wind energy utilisation wind is one such potential energy source. In this study, the coastal wind regime is analysed and historical data from a coastal weather station are used to estimate the potential for wind generation. It is found that a hybrid Weibull probability density function best describes the annual wind speed frequency distribution at the reference height of 10.67 m. With an annual mean wind speed of 5.8 ms, an energy pattern factor of 1.41, and an annual average power density of 159 Wm2, this distribution represents a class-3 wind resource, suitable for most wind turbine applications. Site analysis and observed trends in coastal wind availability suggest the strong likelihood of a greater wind resource in more open locations. In view of its apparent potential for wind farm operation, a comprehensive, wind resource assessment programme is recommended for the Guyana coastlands. 相似文献
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The Optimal Renewable Energy Model (OREM) has been developed to determine the optimum level of renewable energy sources utilisation in India for the year 2020–21. The model aims at minimising costefficiency ratio and determines the optimum allocation of different renewable energy sources for various end-uses. The extent of social acceptance level, potential limit, demand and reliability will decide the renewable energy distribution pattern and are hence used as constraints in the model. In this paper, the performance and reliability of wind energy system and its effects on OREM model has been analysed. The demonstration windfarm (4 MW) which is situated in Muppandal, a village in the southern part of India, has been selected for the study. The windfarm has 20 wind turbine machines of 200 KW capacity. The average technical availability, real availability and capacity factor have been analysed from 1991 to 1995 and they are found to be 94.1%, 76.4% and 25.5% respectively. The reliability factor of wind energy system is found to be 0.5 at 10,000 hours. The OREM model is analysed considering the above said factors for wind energy system, solar energy system and biomass energy systems. The model selects wind energy for pumping end-use to an extent of 0.3153×1015 KJ. 相似文献