The conventional distributed secondary controller, consisting of a voltage controller and a power controller, is based on the parallel framework by exchanging two state variables and requires a voltage observer to regulate the voltage. In this article, a cascaded control framework is proposed to achieve the voltage regulation and power sharing, in which only the power state variable is exchanged without the voltage observer. The secondary power controller is designed to adjust the reference value of the secondary voltage controller. And the output of the voltage controller is used to modify the input of the droop controller. Then a resilient cascaded controller is further proposed to enhance the controller resilience against time delays and disturbances. An extra information exchange block between the power controller and the voltage controller is introduced in the resilient cascaded controller. Moreover, the steady-state analysis is carried out to prove the effectiveness of proposed controllers. A small-signal model is also established to investigate the impact of controller parameter variation on the system dynamics. Finally, several case studies are conducted by simulations to demonstrate the performance of proposed controllers.

中文翻译：

---

DC微电网中的级联分布式控制框架

由电压控制器和功率控制器组成的常规分布式次级控制器基于并行框架，通过交换两个状态变量，并且需要电压观察器来调节电压。在本文中，提出了一种级联控制框架以实现电压调节和功率共享，其中仅交换功率状态变量而无需电压观察器。次级功率控制器设计用于调整次级电压控制器的参考值。电压控制器的输出用于修改下降控制器的输入。然后，进一步提出了一种弹性级联控制器，以增强控制器抵抗时间延迟和干扰的能力。弹性级联控制器中引入了功率控制器和电压控制器之间的额外信息交换块。此外，进行了稳态分析以证明所提出的控制器的有效性。还建立了一个小信号模型来研究控制器参数变化对系统动力学的影响。最后，通过仿真进行了一些案例研究，以证明所提出的控制器的性能。