Energy Cooperative Control Strategies for Distributed Energy Storage Systems

In this paper, to solves the problems of unbalanced state of charge (SOC), unreasonable load current sharing, and unstable direct current (DC) bus voltage, a cooperative control strategy for the energy of distributed energy storage systems (DESSs) is proposed. and unlike droop-based secondary controllers, the designed voltage-current cooperative controller is based on the droop-free primary controller, the current by capacity allocation and voltage regulation can be realized simultaneously at the primary control layer. On this basis, a SOC balance controller based on an adaptive current strategy is designed in the current inner loop, which can quickly achieve SOC balance. Finally, the feasibility and effectiveness of the proposed strategy are verified by simulation analysis.