This paper presents a two-layer distributed cooperative control method for networked microgrid (NMG) systems, taking into account the proprietary nature of microgrid (MG) owners. The proposed control architecture consists of an MG-control layer and an NMG-control layer. In the MG layer, the primary and distributed secondary controls realize accurate power sharing among distributed generators (DGs) and the frequency/voltage reference following within each MG. In the NMG layer, the tertiary control enables regulation of the power flowing through the point of common coupling (PCC) of each MG in a decentralized manner. Furthermore, distributed quaternary control restores the system frequency and critical bus voltage to their nominal values and ensures accurate power sharing among MGs. A small-signal dynamic model is developed to evaluate the dynamic performance of NMG systems with the proposed control method. Time-domain simulations and experiments on NMG test systems are performed to validate the effectiveness of the proposed method.

中文翻译：

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孤岛网络微电网系统的两层分布式协同控制方法

考虑到微电网（MG）所有者的专有性，本文提出了一种用于网络微电网（NMG）系统的两层分布式协作控制方法。所提出的控制体系结构由MG控制层和NMG控制层组成。在MG层中，主要控制和分布式辅助控制可实现分布式发电机（DG）和每个MG内部遵循的频率/电压参考之间的准确功率共享。在NMG层中，第三级控制能够以分散的方式调节流经每个MG的公共耦合点（PCC）的功率。此外，分布式四元控制将系统频率和关键总线电压恢复到其标称值，并确保MG之间的功率共享准确。利用提出的控制方法，建立了一个小信号动态模型来评估NMG系统的动态性能。在NMG测试系统上进行时域仿真和实验，以验证所提方法的有效性。