This Book Provides the coverage of the Development of Renewable Energy Systems and also the Improvement of Power Quality in the Developments of RES. The Book also covers the Modeling and Analysis of inverters for a Hybrid Energy Systems. It also covers the area of concepts of Harmonics and types of Harmonics generated in the Renewable Energy Systems. It also Discusses the Mitigation Techniques for Harmonics and it mainly focuses on the mitigation of Odd Harmonics. The Book also Covers the Predictive Techniques such as Fuzzy Logic systems. The Book Provides the Valuable Information which helps to the research Scholars, PG Students in the Field of Electrical Engineering.