Topology simplification method based on switch multiplexing technique to deliver DC-DC-AC converters for microgrid applications

This paper presents a topology derivation method based on switch multiplexing to simplify the configuration of multi-port power electronics interface (MPEI) for DC microgrid applications. In order to achieve reliability and efficiency enhancement of MPEI, the configuration of MPEI is to be optimized according to multiple objectives especially the characteristic of all the ports. Firstly, MPEI is separated and summarized as two basic units of bi-directional power transfer. Subsequently, by combining the basic units and multiplexing switches, the switch number in the overall system can be reduced. This, in turns increases power density and affordability. Meanwhile the system efficiency could be improved in some applications by using the proposed topologies. After the topology deduction, the work conditions for all kinds of topologies are introduced briefly which can guide the selection of various configurations. At last, the feasibility of some derived topologies is verified with experimental results.