CHAPTER 1

INTRODUCTION

Background of the study

Wind is the most economical and safest means of energy generation. Wind can supply energy without emitting harmful substances and chemical compounds that contribute to the rampant acceleration of the destruction of our environment that lead to global warming. Furthermore, wind power is the best option other than any other means of electricity generations such as fossil fuels and other harmful energy resources which cause damage not only danger to the human health but as well as to the environment.
The multiplication of the usage of wind energy as a power source for electricity is worldly outgrowing. An estimation of 45,000 megawatts were installed in 2012 and ten percent increase in installation was recorded, a large difference if we compare the data gathered in 2011 and in 2012.
The unbalanced heating of the atmosphere due to the sun’s energy results to the formation of winds, the untypical surface and the rotation of the earth around the sun causes winds. Wind directions are interrupted by the mountainous structure of the earth, its hydrologic state and its land plains. When winds pass turbines, it can generate electricity.
From kinetic energy, wind propellers changes it into mechanical energy, this mechanical energy powers into different tasks such as grinding grain or pumping water or a generator can convert this mechanical power into electricity to power homes, business, schools and the like.
Wind turbines, like aircraft propeller blades, turn in the moving air and power an electric generator that supplies an electric current. Simply