During previous centuries, humanity had relied on fossil fuels to generate the demanded energy. Nowadays, the extensive use of oil, gas and coal for energy production is becoming a major problem which concerns modern society. Global warming and climate change are the biggest challenges the scientific community has faced. The main factor which causes those problems is the high dependence on fossil fuels. Moreover, those resources are naturally limited and will extinct in time. For all those reasons, during the last decades, there is intense research on finding ways to produce the needed energy in a sustainable fashion. Renewable Energy Sources have a minimal impact on the environment compared to traditional energy sources. Those resources can effectively tackle the problems which arise with fossil fuel usage. Among all the Renewable Energy Sources, wind energy is the most promising and becomes one of the mainstream power sources in many countries around the world. This happens because wind energy conversions systems have reached a mature stage for wide-scale integration...