Novel Topology of Modular-Matrix-Converter-Based Smart Transformer for Hybrid Microgrid

A novel structure of matrix-converter-based Smart Transformer (MC-ST) is proposed for hybrid microgrid applications. The conventional ST structure in hybrid microgrid normally consists of two different kinds of modules: cascaded H-bridges (CHBs) and dual active bridges (DABs). For reliability and simplicity, the modularity concept is employed in the proposed structure to obtain only one kind of module. Utilizing the feature of matrix converters as the universal converters, the proposed ST can transfer AC input to AC output as well as to DC output using the same module and same modulation method. Moreover, in order to implement the proposed ST, feedback control of low voltage AC (LVAC) and low voltage DC (LVDC) is implemented. Simulation results show that the proposed MC-ST is feasible and has a potential application in the future hybrid microgrid.