The hybrid energy storage systems (HESSs) in vessel integrated power systems can support pulse load and improve system stability. However, the unbalanced SOC of different energy storage devices can cause over-charge and over-discharge which damages the energy storage devices and affects the stable operation of the entire system, especially when there are multiple groups of HESSs. Therefore, a decentralized control strategy for the HESSs in integrated power systems (IPSs) based on extended droop control combined with SOC balance control is proposed in this paper. In the proposed strategy, SOC recovery control is introduced to the virtual capacitance droop coefficient of the supercapacitor, and SOC equalization control is introduced to the virtual resistance droop coefficient of the lithium battery to adjust the output characteristics of the HESS according to the SOC. Then the frequency response characteristics are analyzed and the stability of the system is calculated. Finally, the hardware in loop simulation is conducted to verify the effectiveness of the proposed strategy. Comparisons show that the proposed strategy can compensate for the pulse load according to the responding characteristics of the HESS and achieve SOC balance between different energy storage devices under various working conditions.

船舶综合电力系统中的混合储能系统（HESS）可以支持脉冲负载并提高系统稳定性。然而，不同储能器件的SOC不平衡会导致过充过放，从而损坏储能器件，影响整个系统的稳定运行，尤其是多组HESS时。因此，本文提出了一种基于扩展下垂控制与SOC平衡控制相结合的综合电力系统（IPS）中HESS的分散控制策略。在所提出的策略中，将SOC恢复控制引入到超级电容器的虚拟电容下垂系数中，对锂电池的虚拟电阻下垂系数引入SOC均衡控制，根据SOC调整HESS的输出特性。然后分析频率响应特性并计算系统的稳定性。最后通过硬件在环仿真验证了所提策略的有效性。对比表明，所提策略可以根据HESS的响应特性对脉冲负载进行补偿，实现不同工况下不同储能设备之间的SOC平衡。