Wind Turbine Disadvantage

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3. Wind turbine 3.1 Working of wind turbine: Wind turbine can be defined as a fan consisting of blade/blades that rotate due to blowing wind. A gear box is used for converting energy from one device to another device using mechanical method; hence, it is termed as a high-precision mechanical system. There are different types of wind turbines, but the frequently used wind turbines are horizontal axis turbines and vertical axis turbines. The figure shows different blocks of the wind turbine. Figure 2 Wind turbine Block Diagram 3.1.1 Vertical Axis wind turbine  The principal advantage of vertical axis machines, such as the Darrieus rotor is that they don’t need any kind of yaw control to keep them facing into the wind. A second advantage is that the heavy machinery contained in the nacelle (the housing around the generator, gear box, and other mechanical components) can be located down on the ground, where it can be serviced easily. Since the heavy equipment is not perched on top of a tower, the tower itself need not be structurally as strong as that for a HAWT  There are several disadvantages of vertical axis turbines, the principal one being that the blades are relatively close to the ground where wind speeds are lower. Power in the wind increases as the cube of velocity so there is considerable…show more content…
A downwind machine has the advantage of letting the wind itself control the yaw (the left–right motion) so it naturally orients itself correctly with respect to wind direction. They do have a problem, however, with wind shadowing effects of the tower. Every time a blade swings behind the tower, it encounters a brief period of reduced wind, which causes the blade to flex. This flexing not only has the potential to lead to blade failure due to fatigue, but also increases blade noise and reduces power

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