A Hierarchical Power Routing Scheme for Interlinking Converters in Unbalanced Hybrid AC-DC Microgrids

In this paper, a hierarchical power routing scheme for Interlinking Converters (ICs) in unbalanced hybrid AC-DC microgrids is proposed. The proposed scheme aims to minimize power losses in the microgrid and increase the system loadability at the point of common coupling (PCC). Control variables of this optimization problem are active and reactive power bias factors of all three-phase ICs. At first, the optimization problem minimizes the power losses in the microgrid, afterward a supervisory control scheme is applied to maximize the loadability at the PCC by assigning the three phase power mismatches at the PCC to ICs. The obtained results from implementing the proposed strategy on the modified IEEE 13 bus system are compared with other strategies which are aimed to just maximize loadability or minimize power losses to show the validity and advantages of proposed method.