- 期刊
An Adaptive Rapid Balancing Control for Clustered SoC of Cascaded Battery Energy Storage Converter
摘要
Accelerating the balancing speed of the cascaded battery energy storage converter can improve the output performance, utilization rate and battery life of the energy storage unit in response to the problem of clustered SoC imbalance. On the basis of analyzing the principle of system power redistribution caused by injecting zero sequence voltage during clustered imbalance, the relationship between the variable power injection and the battery SoC was explored; Secondly, considering the modulation constraints of each power unit and the charging and discharging limitations of each battery, the boundary of the superimposed zero sequence voltage required for clustered balanced is analyzed. Based on the above analysis, an adaptive rapid balancing control for clustered SoC is proposed. When the degree of SoC imbalance is large, the maximum zero sequence voltage is continuously injected to improve the speed of clustered SoC balanced. Contrarily, a PI controller is used to ensure that the system achieves zero difference balanced while taking into account system stability. Finally, the effectiveness of the proposed control strategy is verified through simulation analysis.