Abstract：In order to settle the energy balancing issue between energy storage modules and improve the modularity of the cascade storage energy storage system, this paper proposes a distributed energy balancing control strategy. Independent voltage and current closed loops are built in the strategy by making full use of the DC converter modular structure characteristics. For the purpose of making sub-modules balance energy independently, droop control ideology and state of charge (SOC) are adopted in the redesigned current loop. Thus, the sub-module can adjust the operating current according to its SOC, and then realize the automatic adjustment of energy distribution to achieve the purpose of balancing control. In order to reduce the effect of SOC on system current, current correction unit is introduced to improve the current regulation. This strategy has no influence on the ability of ESS to stabilize the DC bus voltage and does not require any communication between modules, so that the system owns complete modular features. At last, the experimental results have verified the proposed strategy.
毕恺韬, 孙力, 安群涛, 段建东, 高钰阁. 基于模块化多电平直流变换器的储能系统分布式能量均衡控制策略[J]. 电工技术学报, 2018, 33(16): 3811-3821.
Bi Kaitao, Sun Li, An Quntao, Duan Jiandong, Gao Yuge. Distributed Energy Balancing Control Strategy for Energy Storage System Based on Modular Multilevel DC-DC Converter. Transactions of China Electrotechnical Society, 2018, 33(16): 3811-3821.
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2018, Vol. 33 
