Comparison between Two-level and Three-level Based Multi-port Converter for Interconnected MVAC Microgrids

In this paper, two-level and three-level modules for a three-phase multi-port converter (MPC) are evaluated and compared regarding the number of components and semiconductor losses. The MPC connects two medium-voltage ac (MVAC) microgrids to a common storage unit. The two-level MPC unit comprises a full-bridge converter for the ac-side and an isolated triple active bridge (TAB) dc-dc converter connecting the three ports. The full-bridge is replaced by a three-level neutral point clamped converter in the three-level solution. The comparative study was performed using PLECS simulation.