For quite a few years, the conservation of the environment has generated considerably concern and ultimately, plenty technologies were developed. This is the case of wind power. Formerly, we spent this source of energy for water pumping or grinding wheat to make flour. Today, this power source is still exerted to pump water but it is generally spent to cause electricity, without any negative effect on the environment. The favor in operating costs for nuclear and fossil fuels have also allowed wind energy to become exceptionally more competitive.
Wind energy has been exerted for some time. It is gathered when the wind pushes against a propeller that is to some degree bent. This forces all the blades to turn and siphon well water or turns a generator to produce electricity. There are two types of wind turbines, vertical axis turbines and horizontal axis. Nearly all wind turbines are horizontal. They have a few disadvantages, among others, the generator is located at the top of the tower, which makes it difficult to maintenance and repair. The vertical wind turbine, developed by the Canadians, has several advantages. First, access to the generator and the main mechanical components are located at the bottom of the tower. In addition, no system to navigate the direction of the wind turbine is necessary. This turbine is still in development, but it is anticipated that when fully functional, it will have a notable impact on the use of turbines for wind energy.
Wind power is extracted from a wind turbine and subsequently transformed into electricity by a generator. The generator current is sinusoidal and when plugged into the electricity grid, its frequency must be the same as the power grid or 60 Hertz. As the speed of the impeller determines the current frequency of the generator, it is needed that the turbine rotates at a stable speed. For this reason, much of the energy is not extracted from the wind. Presently, it is very important that a device operates at a very high yield. The same principle applies to wind turbines. In addition, researchers have found that it is possible to extract more energy from the wind by correcting the sinusoidal current in order to obtain a DC. Then, with the help of a converter, the current is transformed back into a sinusoidal wave but with a steady frequency of 60 Hertz. This means that the turbine can turn almost any speed and thus extract additional energy. Although the converter is often very complex and is expensive, the energy gain is worth the effort.
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