Isolated Multi Level Virtual Conductor with Plug and Play Operation Using Bi-directional Dual Active Bridge Converter

To reduce management and expansion costs of the power system, plug and play approach can be used which reduces an effort to connect equipments. Among them, a DC power grid interconnection system called Multi Level Virtual Conductor can be used to realize a DC distribution system that allows free placement of equipment without communication. This paper studies an implementation of electrical isolated Multi Level Virtual Conductor using bidirectional Dual Active Bridge converters, which has not yet been realized. A small-signal model of the system was derived by dynamic analysis, and design guidelines for the control system were discussed. Also, DC buses with different voltage specifications were connected in a loop using the interconnection system through circuit simulation, and it was found that the power distribution was maintained flexibly regardless of either state changes of the components connected to each DC bus or disconnection of the power transmission route.