Hierarchical Control for Multiple DC-Microgrids Clusters
Hierarchical Control for Multiple DC-Microgrids Clusters
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DOI：
10.1109/ssd.2014.6808857
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发表时间：
2014-02
影响因子：
4.9
通讯作者：
Q. Shafiee;T. Dragičević;J. Vasquez;J. Guerrero
中科院分区：
文献类型：
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作者：
Q. Shafiee;T. Dragičević;J. Vasquez;J. Guerrero
为保证直流微电网集群的可靠运行，提出了一种分布式分层控制框架。在这个层次结构中，主控制用于本地调节每个MG内部的公共母线电压。提出了一种基于电池荷电状态自动确定下垂系数的自适应下垂方法。建立了一个小信号模型，研究了系统参数、恒功率负载以及mg之间的线路阻抗对系统稳定性的影响。在二级系统中，引入了基于共识的分布式稳压器，消除了各节点间的平均电压偏差。这种分布式平均方法允许同时实现mg之间的功率流控制，因为它只能以系统内部电压偏差为代价来完成。然后采用另一种分布式策略，根据本地soc来调节各mg之间的功率流。每个MG上的分布式控制器通过通信基础设施仅与相邻的MG通信。最后，将所建立的小信号模型扩展到具有所有所提出的控制回路的MG集群。通过详细的硬件在环仿真验证了所提分层方案的有效性。
This paper presents a distributed hierarchical control framework to ensure reliable operation of dc microgrid (MG) clusters. In this hierarchy, primary control is used to regulate the common bus voltage inside each MG locally. An adaptive droop method is proposed for this level, which determines droop coefficients according to the state-of-charge (SOC) of batteries automatically. A small-signal model is developed to investigate effects of the system parameters, constant power loads, as well as line impedance between the MGs on stability of these systems. In the secondary level, a distributed consensus-based voltage regulator is introduced to eliminate the average voltage deviation over the MGs. This distributed averaging method allows the power flow control between the MGs to be achieved at the same time, as it can be accomplished only at the cost of having voltage deviation inside the system. Another distributed policy is employed then to regulate the power flow among the MGs according to their local SOCs. The proposed distributed controllers on each MG communicate with only the neighbor MGs through a communication infrastructure. Finally, the developed small-signal model is expanded for MG clusters with all the proposed control loops. The effectiveness of the proposed hierarchical scheme is verified through detailed hardware-in-the-loop simulations.