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<p>Aiming at the problem of power distribution of multiple storage units during grid-connected operation of energy storage systems, the relationship between the PCS transmission power and the health state of the storage system, battery temperature, battery ohmic internal resistance and grid-connected requirements is analysed, and the average value of current is found to be a key factor in influencing the ageing rate of the battery and improving the safety of the system. To this end, a multi-storage unit balanced <i>SOH</i>-<i>SOC</i> control strategy based on the battery life change rule is proposed, and under the premise of ensuring that each <i>SOC</i> is balanced, the average value of charging and discharging currents of each storage unit is adjusted by using the hierarchical analysis method in order to equalise the <i>SOH</i> of each storage unit. Simulation validation shows that, compared to the traditional uniform power control strategy, the proposed control strategy can effectively balance the <i>SOH</i> and <i>SOC</i> states of each energy storage unit, keep the system's overall capacity for a longer period, and is simple and practical, making it easy to apply in actual engineering.</p>

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A balanced SOH-SOC control strategy for multiple battery energy storage units based on battery lifetime change laws

  • 期刊论文

  • 发表日期：

    2025年1月8日

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  • Guiquan Chen,
  • Xiangyang Xia,
  • Xiaoyue Zhao,
  • Xiaoyong Zeng,
  • Ting Ouyang,
  • Haozhe Feng

摘要

Aiming at the problem of power distribution of multiple storage units during grid-connected operation of energy storage systems, the relationship between the PCS transmission power and the health state of the storage system, battery temperature, battery ohmic internal resistance and grid-connected requirements is analysed, and the average value of current is found to be a key factor in influencing the ageing rate of the battery and improving the safety of the system. To this end, a multi-storage unit balanced SOH-SOC control strategy based on the battery life change rule is proposed, and under the premise of ensuring that each SOC is balanced, the average value of charging and discharging currents of each storage unit is adjusted by using the hierarchical analysis method in order to equalise the SOH of each storage unit. Simulation validation shows that, compared to the traditional uniform power control strategy, the proposed control strategy can effectively balance the SOH and SOC states of each energy storage unit, keep the system's overall capacity for a longer period, and is simple and practical, making it easy to apply in actual engineering.