Consensus-Based Distributed Coordination Control of Hybrid AC/DC Microgrids

The controller of the interlinking converter (ILC) in a hybrid ac/dc microgrid (MG) system plays an important role of maintaining power sharing between ac and dc MG systems. The coordination control between the ILC controllers and the secondary controllers in each MG should be considered to maintain proper power sharing among two MGs and improve power qualities of hybrid MG system. This paper proposes a distributed coordination control strategy for the hybrid ac/dc MG. The proposed control strategy not only regulates accurate dc current and reactive power sharing among DGs in ac and dc MGs, but also maintains power sharing among two MGs and restores the ac frequency and dc voltage to their nominal values. The hierarchical control of the ILC, comprised of primary and secondary control layer, is proposed to regulate power sharing between ac and dc MGs. The proposed control strategy is based on distributed consensus algorithm, which is developed to achieve the accurate reactive power sharing and dc current sharing in ac and dc MGs. The feasibility of the proposed control strategy is validated by the laboratory prototype hybrid MG system. A comparison study on the proposed control and the conventional control is presented to show the effective of the proposed control strategy.