Research Advances in Multiport DC Converter of Distributed Generation Systems

DC microgrids combine ports in various forms, such as power supply, energy storage, and load, and can operate in isolated islands and grid-connected ways in a variety of situations. Multiple converters in parallel on the DC bus will lead to system redundancy, complex control, and low efficiency. By integrating many different forms of ports, a multi-port DC converter has emerged. This paper first introduces the topology of multiport converters, summarizes the existing derivative products of multiport converters, and then briefly introduces their structures, and analyzes their functions and advantages and disadvantages. Because they provide electrical isolation between all ports, effectively preventing the risk of shock and fault propagation, isolated converters perform best in terms of safety, resistance to electromagnetic interference, and system reliability. Non-isolated converters have advantages in terms of cost and efficiency. Partially isolated converters offer a compromise that provides isolation for specific ports, improving security while controlling cost and complexity.