Distributed cooperative hierarchical control for DC microgrid

This paper proposes a distributed cooperative hierarchical control scheme for DC microgrid based on consensus algorithm. The control architecture includes primary control, secondary control and tertiary control, which secondary controller uses a consensus algorithm. Four power generators are a cooperative relationship with each other through the control layer. The controller of each converter only exchanges data with the adjacent converter on the cyber layer communication network. When the internal power of the microgrid is higher than the external system, the tertiary controller can be used to deliver energy to the external power grid and achieve power optimization between the microgrids. Finally, through the experimental simulation, it is verified that hierarchical control can effectively regulate the DC microgrid bus voltage in the target range and achieve power exchange management with the external power grid.