Distributed Control Strategy for the Battery based DC Microgrid

Droop control have been widely applied in DC microgrid. However, it fails to provide regulated rated voltage and proportional load distribution due to the droop characteristics and the transmission line resistance. In order to take advantage of the dispersed energy storage units in the DC microgrid, a distributed control strategy is proposed in this paper. Average voltage control and power coordination are used in the distributed coordination control segment based on traditional V I droop control strategy. According to the proposed control strategy, the information is exchanged between adjacent nodes through the consensus algorithm, a sparse information communication network is built to compensate voltage offset caused by droop control, and to distribute load according to the SOC of the energy storage system. Firstly, the small signal stability of DC micro grid with two energy storage system is analyzed. Then another model of DC micro grid with three energy storage system is built in MATLAB/SIMULINK, and the simulation results verify the effectiveness of the proposed control strategy.