Wind Energy Electricity Generation
Formation of wind can be visible at ocean bank where land and huge water meet. During daytime, the air above the land becomes hotter, more quickly than the air above the water. The warm air above the land expands, becomes less dense and hence lighter. The air above the water becomes hot less quickly than that on the land hence air above the water remains heavier, denser compared to the air above the land. The hotter air above the land gets higher due to its less density. As soon as this air gets high, cooler air over the water flows in to take the vacant place, and consequently, there is wind. In this way, the wind energy forms in ocean bank during the daytime. Again during the night, the land radiates heat more rapidly than water. Hence, land portion becomes cooler more quickly than water. Because of that, the air above the land becomes cooler than the air above the water. Hence, at night the hotter air above the water gets high because of lesser density. Cooler and heavier air from the land portion will occupy this vacant space. Hence there will be again a wind but in reverse direction compared to daytime.
Again, the atmosphere near the equator becomes hotter than the atmosphere nearer to the north and south poles. Because of that, there are always winds nearer to the equator. We call the kinetic energy available due to flow of as wind energy and we can be efficiently utilize this energy for generating electricity.
Wind Energy Electricity Generation SystemWind is a clean source of energy. It has no effect of the greenhouse on the atmosphere. It is a substitute for fossil fuels such as coal, petroleum and natural gas, etc. Although, coal, petroleum, and natural gas, etc. are the primary source of fuel for producing electricity availability of such fossil fuel is limited. Globally, 67% of electricity generated from fossil fuels, 13% from nuclear energy and rest of 20% from a renewable energy source such as hydro energy, solar energy, wind energy, tidal energy, etc. So we see how much the world depends on fossil fuel for producing electricity and that is why we focus on wind and other renewable energy sources to generate electricity to overcome the dependence on fossil fuels. Running cost of producing electricity with wind energy is quite low. Once the turbines are installed, and there is no much maintenance required for a long time. Wind energy electricity generation system takes some land for installation, but we can use most of the land for cultivation. So land is not a big issue for wind turbine generating system. In most of the cases, wind plant is installed at the good height to obtain sufficient wind to produce electricity. It is now fastest growing electricity resource in the world.
One single wind turbine may not be able to produce desired level of electricity, hence, numbers wind turbines are connected together to obtain desired output. This assembly of wind turbines together is called wind farm. We must choose the place for constructing wind farm where the wind speed is sufficient to move the blade of the turbine. When the wind blows through the blades of a turbine, the turbine rotates for running a generator to produce electricity. This electricity flows down through the cable attached to turbine tower. This cable is also interconnected with cables from other wind turbines in the wind farm.
Hence, electricity from all wind turbines comes to a common node from where it is taken for further ends. After all, this electricity is used directly for domestic or industrial load or is drawn by any grid to fulfill the requirement of electricity.