An improved DC-Bus signaling control method in a distributed nanogrid interfacing modular converters

Nanogrid is an advanced concept which is under the frame of microgrid aiming at providing a smart power supply structure for future personal house or single building. In a DC-Bus based nanogrid, modularity is important to realize the flexible plug and play of renewable sources and load. This paper presents an improved DC-Bus Signaling (DBS) control method based on modular converters interfacing renewable sources, energy storage and the utility grid. The smooth transition between grid-connected and islanding modes can be achieved without variations of the control scheme under the proposed strategy. Simulation has been performed on the Matlab-Simulink platform to verify the feasibility and superiority of the proposed control method.