Optimal Operation of Islanded AC/DC Hybrid Microgrids

This manuscript presents a single-phase power flow approach and an optimal power flow formulation for islanded AC/DC hybrid microgrids. Conventional operation of hybrid microgrids with fixed droop gains may yield undesirable operation, such as violation of frequency and voltage limits, or increased cost of operation. The proposed optimal power flow formulation mitigates these issues. Optimal power flow is formulated as a constrained multi-objective nonlinear cost minimization problem. A year-long case study was carried out for a 12-bus islanded AC/DC hybrid microgrid using the single-phase power flow approach in conventional and optimal power flow formulation. Simulation results highlight the effectiveness of the proposed approach.