直流微电网储能荷电状态协调控制OACSTPCD

The energy storage system adopts a series-parallel structure(one series of energy storage units,multiple groups in parallel)to connect small-capacity,low-voltage levels of energy storage unit to the DC microgrids,and it can achieve system expansion and the increase of terminal voltage.In order to avoid the short-board effect of individual energy storage units being returned early due to the difference in state of charge(SOC)and rated capacity of energy storage units in se-ries-parallel structure,a control method is proposed considering energy storage SOC and rated capacity to achieve a rea-sonable distribution of voltage between series modules and power between parallel modules.Considering the problem that the equilibrium speed is slow due to the small SOC difference between energy storage units in the later stage of power dis-tribution,a variation coefficient is introduced to dynamically optimize the droop coefficient.Considering that the total ca-pacity of each group is different due to boost or expansion,the capacity weight factor is introduced to make the energy stor-age unit reach the equilibrium output.The feasibility of the strategy is verified by building a MATLAB/Simulink simula-tion model.