Energy balancing strategy for hybrid energy storage based on improved SOC power exponential droop control
In order to suppress the voltage fluctuation of microgrid and absorb unbalanced power,a droop con-trol energy management method based on improved SOC power index is proposed for the hybrid energy storage system of lithium battery and super capacitor in DC microgrid.This method not only improves the shortcomings of poor current balance and voltage deviation caused by traditional droop control,but also uses online imped-ance detection method to quantify the line resistance value,eliminates its influence on the balance of energy storage output current,and compensates for the DC bus voltage offset caused by droop control through seconda-ry control.Finally,a simulation system model of optical storage DC microgrid is constructed based on the Mat-lab/Simulink simulation platform,which tests the voltage stability effect of the DC microgrid,and verifies the superiority of the improved SOC power index droop control method over the traditional droop control method.
DC microgridhybrid energy storageSOC droop controlonline impedance detection
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