为实现孤岛微电网中不同尺寸（容量和电压）分布式储能单元 (Distributed Energy Storage Units, DESUs)的荷电状态(State of Charge, SoC)均衡，提出一种基于P-ω下垂控制的改进型控制方案，在无需中央控制器和通信的前提下实现不同尺寸DESUs的SoC均衡，延长DESUs的使用寿命。在分析传统下垂控制原理和SoC的基础上，阐明所提方案实现不同尺寸DESUs的SoC均衡机理。仿真和实验结果说明：所提方案能够消除尺寸参数差异对SoC均衡的影响，通过SoC均衡因子的调节实现不同负荷下不同尺寸DESUs的SoC均衡。
英文摘要:
In order to realize the state of charge (SoC) balance of distributed energy storage units (DESUs) with different sizes (capacity and voltage) in the islanded micro-grid, an improved control scheme based on P-ω droop control is proposed, which realizes the SoC balance of different sizes of DESUs without central controller and communication, and prolongs the service life of DESUs. Based on the analysis of conventional droop control principle and SoC, the SoC balancing mechanism of DESUs with different sizes is derived. Simulation and experimental results show that the proposed scheme can eliminate the influence of size parameter difference on SoC balance, and realize SoC balancing of DESUs with different sizes under different loads by adjusting SoC balancing factors.