ABSTRACT
Renewable energy systems, such as wind turbines, photovoltaic (PV) systems, and hydroelectric drives, rely heavily on power electronic converters to interface variable energy sources with the grid or load. One major challenge in these converters is switching losses, which reduce efficiency, generate heat, and limit device lifespan. Soft-switching techniques, including zero-voltage switching (ZVS) and zero-current switching (ZCS), offer effective methods to minimize these losses. This paper reviews the principles of soft-switching, its implementation in various converter topologies, and applications in renewable drives. Comparative analyses highlight the advantages and limitations of soft-switching over conventional hard-switching techniques. The review concludes with future research directions to enhance efficiency and reliability in renewable energy applications.
KEYWORDS: Soft-switching, Zero-voltage switching (ZVS), Zero-current switching (ZCS), Renewable drives, Power converters, Switching losses, Efficiency optimization
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