Distributed Economic Optimal Operation Control Strategy for Islanded DC Microgrids Considering System Delay

The time delay in an electric system greatly and seriously affects the effective implementation of the microgrid economic operation control strategies. To solve this problem, an economic operation control strategy of the DC microgrid considering the time delay of the system is proposed in this paper. The proposed control strategy reduces the system's dependence on the bottom topology and realizes the plug-and-play function of the microgrid. Moreover, it achieves the economic operation control of the system efficiently under any communication topologies. Meanwhile, by analyzing the mechanisms of the impacts of the control and communication delays on the system, a compensation strategy is proposed, improving the operation stability of the system under high-delay scenarios. Simulation analysis shows that the application of the proposed control strategy is able to reduce the impacts of the time delays on the economic operation stability of the system and the realization of the plug-and-play function of the DC microgrid. It improves the system's ability to resist time delays effectively.