Abstract
Aiming at the problem of over-charge and over-discharge caused by different state-of-charge (SOC) of multi-energy storage units in traditional droop control, an improved droop control strategy based on the SOC power exponent of lithium battery with secondary voltage compensator was proposed. First, based on the relationship between the SOC of the lithium battery and the charge and discharge current, a controller with the power index of SOC compensation sag coefficient is designed to balance the charge and discharge speed of lithium battery. At the same time, in order to reduce the DC bus voltage deviation during system disturbance, a secondary voltage regulator is added. Finally, the Matlab/Simulink simulation model is built to verify the proposed strategy under the load switching environment. The results show that the control strategy can control the charging and discharging current of the energy storage unit according to the SOC real-time state quantity, ensuring the safe and stable operation of the DC microgrid.
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