Hierarchical Control Structure of DC Microgrid Based on Virtual DC Machine Control

To cope with the problem that the existing control cannot achieve zero-error voltage track and accurate power distribution, a hierarchical control structure is proposed, in which the first layer presents virtual DC machine control, draws on the DC machine model to simulate its power regulation characteristics, and provides virtual inertia and damping for the DC voltage. The second layer control adopts distributed average consensus control, in which the energy storage units (ESU) exchange information and cooperate with each other through the adjacency nodes, so as to achieve accurate power distribution among ESU. Finally, the microgrid simulation model is built to verify the correctness of the above control strategy.