Abstract In this article, a two-layer bus voltage regulation strategy with distributed energy storages (DESs), is proposed for dc distribution networks. The developed droop principle based on the power coupling characteristics of ac/dc interface is derived as the basis of the primary control. Besides, the state of charge (SoC) of DES unit is considered inherently in the primary regulation, which can effectively contribute to the long-term performance and life span of DES unit. Then, the cost characteristics of DES device and its connecting converter are analyzed in detail, and the secondary voltage regulation is accordingly designed based on the developed dynamic equal incremental cost principle. The proposed two-layer voltage regulation can achieve the economic power dispatch during the multi-bus voltage regulation without deteriorating the voltage quality, which can obtain a trade-off between the voltage performance improvement and the DESs economic operating. The performance of the proposed control strategy is validated with different operating conditions in the case studies.

中文翻译：

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分布式储能直流配电网的两层动态调压策略

摘要 在本文中，提出了一种用于直流配电网络的具有分布式储能 (DES) 的两层母线电压调节策略。基于交流/直流接口的功率耦合特性开发的下垂原理被推导出为初级控制的基础。此外，DES 单元的荷电状态 (SoC) 被固有地考虑在初级监管中，这可以有效地促进 DES 单元的长期性能和寿命。然后，详细分析了DES器件及其连接变换器的成本特性，并根据所提出的动态等增量成本原理设计了二次稳压。提出的两层调压可以在不降低电压质量的情况下实现多母线调压期间的经济电力调度，在电压性能提升和DESs经济运行之间取得平衡。在案例研究中，所提出的控制策略的性能在不同的操作条件下得到验证。