This paper proposes a novel cooperative control strategy for voltage restoration and power management in DC microgrids based on the DC bus signaling (DBS) method. In the conventional DBS method, the operation mode is determined according to the voltage deviation. Thus, it is difficult to achieve voltage restoration. To overcome this problem, the conventional DBS method is modified by applying the total power of dispatchable units (DUs) to identify the operation mode instead of the voltage deviation. As a result, the average output voltage of the DUs is restored to its nominal value in all of the operation modes without difficulty. In addition, accurate power sharing is achieved regardless of the line impedance or load change by regulating the voltage magnitude using a simple PI controller. Furthermore, the control performance is theoretically analyzed using a small signal analysis to evaluate the stability of system. The proposed method is validated with results from a lab scale experiment.

中文翻译：

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直流微电网电压恢复与功率分配的协同控制策略

本文提出了一种基于直流母线信号 (DBS) 方法的直流微电网电压恢复和电源管理的新型协同控制策略。在传统的 DBS 方法中，操作模式是根据电压偏差确定的。因此，难以实现电压恢复。为了克服这个问题，通过应用可调度单元 (DU) 的总功率而不是电压偏差来识别运行模式，对传统的 DBS 方法进行了修改。因此，在所有操作模式下，DU 的平均输出电压都可以毫无困难地恢复到其标称值。此外，通过使用简单的 PI 控制器调节电压幅度，无论线路阻抗或负载变化如何，都可以实现准确的功率分配。此外，采用小信号分析法对控制性能进行理论分析，评价系统的稳定性。所提出的方法得到了实验室规模实验结果的验证。