A voltage equalization control strategy of series energy storage units based on resonant converter
In the energy storage system,higher voltage is usually obtained by connecting multiple energy storage monomers in series.However,the utilization of the energy storage unit could be reduced due to voltage variation of the energy storage monomers.To address above problem,a voltage equalization control strategy of series energy storage unit was proposed based on resonant converter.Through the interplay of the switching array and resonant converter,the equalization circuit can realize energy transfer between any monomer and any multi-monomers,and both of the two energy transfer modes can realize zero-current switching,which can reduce circuit loss.To obtain the optimal equalization speed and efficiency,K-Means clustering compound control strategy was adopted to prioritize the equalization of the grouping units,and the equalization was then carried out among the monomers.Finally,the equalization simulation of six series-connected energy storage monomers was carried out using Matlab/Simulink platform.The simulation results show that under the static equalization the voltage can reach equalization condition within about 24 min with accuracy of 5 mV and efficiency of 98.98％.Compared with traditional method,this equalization method has faster equalization speed and higher efficiency.
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