The destructive phenomenon of global warming is developing to more critical and obvious index that causes the melting of polar ice caps and higher sea levels resulting in less land for an increasing population, along with the severe changes in climate. Essentially, the growth of this harsh trend is primarily due to the increase of the greenhouse gases concentration from burning of the fossil fuels. So, traditional approach of producing energy to fulfill the human demand is no longer appropriate; meanwhile, inception of wind energy electrical power systems will be the alternative technologies to bring a better future for all mankind. This book provides a comprehensive explanation of the wind energy potential evaluation technique and a robust sensorless MPPT controller for variable speed PMSG wind turbine stand-alone system modeled in Matlab/Simulink environment which shows the feasibility of the technologies compared to the conventional electrical power generation. The study of the WECS will assist the professionals in wind electrical power generation system, global academic researchers, industrial engineers, or those who may consider in implementing this system