中文摘要：

微电网系统中常采用分布式储能单元作为能量缓冲环节,以提升系统供电的稳定性和可靠性。为实现负荷功率在分布式储能单元之间的合理分配,提出了基于荷电状态（SOC）的改进下垂控制方法。该方法采用分布式控制方式,根据各储能单元的SOC,实时调整下垂系数,使SOC较大的储能单元提供较多的有功功率,而SOC较小的储能单元提供较少的有功功率,并采用传统下垂控制方法对无功功率进行均等分配。建立了基于SOC的下垂控制方法小信号模型,以验证控制系统的稳定性。同时,搭建了基于MATLAB/Simulink的仿真模型和2×2.2kW的实验样机,仿真和实验证明了所提方法的正确性和有效性。

英文摘要：

In order to improve the stability and reliability of the microgrid system,the distributed energy storage unit is employed as the energy buffer.To realize the rational sharing of the load power among different distributed energy storage units,an improved droop control method based on the state-of-charge（SOC） is proposed.With the decentralized SOC-based droop method,the droop coefficient is adjusted according to the SOC.The unit with higher SOC delivers more active power,while the one with lower SOC delivers less active power.Meanwhile,the conventional droop control for equal reactive power sharing is employed.A small signal model of the SOC-based droop control method is developed to validate the system stability.A simulation model based on MATLAB/Simulink and a 2×2.2 kW prototype are implemented to demonstrate the correctness and efficiency of the proposed method.