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Blade is the key part of the wind energy conversion system, its stress is the most complex, if designed unreasonable, it can not reach the service life we expected, even it may be fractured when it is working. That will bring serious economic losses to us. So analysis the load of the blade and change rules of blade structure have extremely vital significance. Based on 750KW wind energy conversion...
Wind energy is a fast-growing interdisciplinary field that encompasses multiple branches of engineering and science. Despite the growth in the installed capacity of wind turbines in recent years, larger wind turbines have energy capture and economic advantages, the typical size of utility scale wind turbines has grown by two orders of magnitude. Since modern wind turbines are large, flexible structures...
Responding to more demand in coming years, the task of the small wind energy industry requires progress on several fronts-from public policy initiatives, to technology development, to market growth. Enhanced technologies such as contra-rotating blades, transmission systems, lubrication, airfoils, generators, and power electronics will lower cost and increase energy production. This paper mainly considers...
Rotor blades of wind energy converters are highly stressed components subject to constant load cycles. Regular inspections of rotor blades are indispensible for reliable operation and cost effective production without longer downtimes. Insurers and lenders demand routine inspection of rotor blades every two years. The wide range of damage that occurs on rotor blades greatly depends on the construction...
The wind power is complement to fossil fuels, which has the characteristics of clean, green and renewable. The paper reviews the properties of wind power from the generation and conversion of wind-power generator. Based on the analysis of wind power, we conclude that non-grid-connection theory is a solution to wind power utilization.
The global electrical energy consumption is still rising and there is a steady demand to increase the power capacity. It is expected that it has to be doubled within 20 years. The production, distribution and use of the energy should be as technological efficient as possible and incentives to save energy at the end-user should be set up. Deregulation of energy has lowered the investment in larger...
Conventional Savonius rotor is a ldquoS-shapedrdquo cross-section rotor, the power performance coefficient (CP=0.15) is rather low. This study introduces a new type-helical Savonius rotor, applies calculation fluid dynamics (CFD) to analyze and improve the performance of the rotor from aspects ratio(H/D), number of blades, overlap distance and helical angle(thetas). The results show the performance...
All over the world, energy companies are investing in technologies to make better use of renewable energy to generate electric power. Wind energy is the renewable energy source that had a higher growing in the last decades and can be considered a hope in future based on clean and sustainable energy. The development of tools that allows operators and maintenance personnel to correlate machinery related...
In this paper, a functional structure of a wind energy conversion system is introduced, before making a comparison between the two typical wind turbine operating schemes in operation, namely constant-speed wind turbine and variable-speed wind turbine. In addition, the modeling and dynamic behavior of a variable speed wind turbine with pitch control capability is explained in detail and the turbine...
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