The shift to more sustainable energy sources has been sped up by the rapid increase in global energy consumption and the consequences of greenhouse gas emissions. Utilizing renewable energy sources like wind, solar, and fuel cells, distributed generation (DG) has become increasingly necessary. Intelligent energy management techniques, affordable high-performance devices, and sophisticated power electronic systems are all thought to be crucial elements of efficient, sustainable, and renewable energy systems. The features of DG are briefly summarized in this paper. An overview of solar, fuel cell, and wind-based energy conversion systems is given. The function of power electronics in solar, wind, and photovoltaic systems has been qualitatively described.