A Decentralized Dynamic Power Sharing Strategy for Hybrid Energy Storage System in Autonomous DC Microgrid
A Decentralized Dynamic Power Sharing Strategy for Hybrid Energy Storage System in Autonomous DC Microgrid
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DOI：
10.1109/tie.2016.2608880
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发表时间：
2017-07
影响因子：
7.7
通讯作者：
Q. Xu;Xiaolei Hu;Peng Wang;Jianfang Xiao;P. Tu;C. Wen;M. Lee
中科院分区：
文献类型：
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作者：
Q. Xu;Xiaolei Hu;Peng Wang;Jianfang Xiao;P. Tu;C. Wen;M. Lee
功率分配是混合储能系统中的一个主要问题。本文提出了一种扩展下垂控制（EDC）策略，以实现动态均流自主在突然的负载变化和资源变化。所提出的方法包括一个虚拟电阻下垂控制器和一个虚拟电容下垂控制器的能量存储与互补特性，如电池和超级电容器（SC）。通过使用这种方法，电池提供一致的功率，SC仅补偿高频波动，而不涉及传统使用的集中式控制器。为了实现所提出的EDC方法，提出了一个详细的设计过程，以实现稳定运行，电压调节和动态电流分配的控制目标。推导了系统的动态模型和相应的阻抗，并进行了详细的频域分析。此外，系统级的稳定性分析进行了研究和系统扩展所提出的方法。仿真和实验验证了所提出的控制策略和分析结果的有效性。
Power allocation is a major concern in hybrid energy storage system. This paper proposes an extended droop control (EDC) strategy to achieve dynamic current sharing autonomously during sudden load change and resource variations. The proposed method consists of a virtual resistance droop controller and a virtual capacitance droop controller for energy storages with complementary characteristics, such as battery and supercapacitor (SC). By using this method, battery provides consistent power and SC only compensates high-frequency fluctuations without the involvement of conventionally used centralized controllers. To implement the proposed EDC method, a detailed design procedure is proposed to achieve the control objectives of stable operation, voltage regulation, and dynamic current sharing. System dynamic model and relevant impedances are derived and detailed frequency domain analysis is performed. Moreover, the system level stability analysis is investigated and system expansion with the proposed method is illustrated. Both simulations and experiments are conducted to validate the effectiveness of the proposed control strategy and analytical results.