共查询到17条相似文献,搜索用时 62 毫秒
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《电网与水力发电进展》2008,(10)
风力机是将风能转换为机械功的动力机械,又称风车。广义地说,它是一种以太阳为热源,以大气为工作介质的热能利用发动机。许多世纪以来,风力机同水力机械一样,作为动力源替代人力、畜力,对生产力的发展发挥过重要作用。近代机电动力的广 相似文献
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设计出一种能有效抑制垂荡运动的新型装配有垂荡板的漂浮式风力机半潜式平台,分析其在风、浪、流载荷联合作用下的动态响应,并与3浮体3立柱结构半潜式平台进行比较。结果表明:在频域分析中,垂荡板对垂荡方向运动响应的抑制效果最好,纵摇方向次之,对横荡方向运动响应无明显抑制效果;在横荡、纵摇和垂荡方向上原平台与垂荡板平台的辐射阻尼均较接近,但与原平台相比,垂荡板平台的附加质量较大。在时域分析中,与原平台相比,垂荡板平台在横荡、纵摇和垂荡方向的运动响应均较小,其中垂荡方向运动响应抑制效果最好,纵摇方向次之,横荡方向抑制效果最差。 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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Marisciel Litong‐Palima Martin Huus Bjerge Nicolaos A. Cutululis Lars Henrik Hansen Poul Sørensen 《风能》2016,19(5):923-938
This paper proposes and validates an efficient, generic and computationally simple dynamic model for the conversion of the wind speed at hub height into the electrical power by a wind turbine. This proposed wind turbine model was developed as a first step to simulate wind power time series for power system studies. This paper focuses on describing and validating the single wind turbine model, and is therefore neither describing wind speed modeling nor aggregation of contributions from a whole wind farm or a power system area. The state‐of‐the‐art is to use static power curves for the purpose of power system studies, but the idea of the proposed wind turbine model is to include the main dynamic effects in order to have a better representation of the fluctuations in the output power and of the fast power ramping especially because of high wind speed shutdowns of the wind turbine. The high wind speed shutdowns and restarts are represented as on–off switching rules that govern the output of the wind turbine at extreme wind speed conditions. The model uses the concept of equivalent wind speed, estimated from the single point (hub height) wind speed using a second‐order dynamic filter that is derived from an admittance function. The equivalent wind speed is a representation of the averaging of the wind speeds over the wind turbine rotor plane and is used as input to the static power curve to get the output power. The proposed wind turbine model is validated for the whole operating range using measurements available from the DONG Energy offshore wind farm Horns Rev 2. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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开发利用洁净能源和可再生能源,改善以煤炭为主的能源结构已成为我国能源建设实现可持续发展战略的重要措施。目前,国内外以风能力代表的新能源的开发利用方兴未艾。通过对国内外风电发展现状的调查研究及国内风电市场发展前景的分析与展望,提出发展风电制造业的一些具体措施,加速能源结构的调整。 相似文献
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To meet the national target of 29% for electricity production from renewable energy sources by 2020 in Greece, effective implementation of massive wind power installed capacity into the power supply system is required. In such a situation, the effective absorption of wind energy production is an important issue in a relatively small and weak power system such as that of Greece, which has limited existing interconnections with neighboring countries. The curtailment of wind power is sometimes necessary in autonomous systems with large wind energy penetration. The absorption or curtailment of wind power is strongly affected by the spatial dispersion of wind power installations. In the present paper, a methodology for estimating this effect is presented and applied for the power supply system of Greece. The method is based on probability theory, and makes use of wind forecasting models to represent the wind energy potential over any candidate area for future wind farm installations in the country. Moreover, technical constraints imposed by the power supply system management, the commitment of power plants and the load dispatch strategies are taken into account to maximize the wind energy penetration levels while ensuring reliable operation of the system. Representative wind power development scenarios are studied and evaluated. Results show that the spatial dispersion of wind power plants contributes beneficially to the wind energy penetration levels that can be accepted by the power system. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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Jinjiang Li Guandao Wang Zhiheng Li Shaolong Yang Wen Tong Chong Xianbo Xiang 《国际能源研究杂志》2020,44(12):9283-9297
Wind energy conversion system, aiming to convert mechanical energy of air flow into electrical energy has been widely concerned in recent decades. According to the installation sites, the wind energy conversion system can be divided into land-based wind conversion system and offshore wind energy conversion (OWEC) system. Compared to land-based wind energy technology, although OWEC started later, it has attracted more attentions due to its significant advantages in sufficient wind energy, low wind shear, high power output and low land occupancy rate. In this paper, the principle of wind energy conversion and the development status of offshore wind power in the world are briefly introduced at first. And then, the advantages and disadvantages of several offshore wind energy device (OWED), such as horizontal axis OWED, vertical axis OWED and cross axis OWED are compared. Subsequently, several major constraints, such as complex marine environment, deep-sea power transmission and expensive cost of equipment installation faced by offshore wind conversion technology are presented and comprehensively analysed. Finally, based on the summary and analysis of some emerging technologies and the current situation of offshore wind energy utilization, the development trend of offshore wind power is envisioned. In the future, it is expected to witness multi-energy complementary, key component optimization and intelligent control strategy for smooth energy generation of offshore wind power systems. 相似文献
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Bao Nengsheng Ma Xiuqian Ni Weidou 《Frontiers of Energy and Power Engineering in China》2007,1(1):67-78
The integral output power model of a large-scale wind farm is needed when estimating the wind farm’s output over a period
of time in the future. The actual wind speed power model and calculation method of a wind farm made up of many wind turbine
units are discussed. After analyzing the incoming wind flow characteristics and their energy distributions, and after considering
the multi-effects among the wind turbine units and certain assumptions, the incoming wind flow model of multi-units is built.
The calculation algorithms and steps of the integral output power model of a large-scale wind farm are provided. Finally,
an actual power output of the wind farm is calculated and analyzed by using the practical measurement wind speed data. The
characteristics of a large-scale wind farm are also discussed. 相似文献