基于柔性直流配电网互联的交直流微电网集群分布式自主控制实现全局经济运行

This paper presents a distributed autonomous control strategy for AC/DC microgrid clusters interconnected by the flexible DC distribution network to simultaneously achieve the global economic operation and frequency/voltage control of the system while complying with the power limits of DGs and interlinking converters. First, the optimal control problem for the system is formulated and the Karush-Kuhn-Tucker (KKT) condition of the system global economic dispatch is obtained. Then, the three-layer control framework including the distributed generator layer (DG-layer), microgrid layer (MG-layer), and microgrid cluster layer (MGC-layer) is established. In the MG-layer, the distributed frequency/voltage and economic dispatch controllers are designed for each ACMG and DCMG. In the MGC-layer, a distributed peer-to-peer control method is provided to realize the coordinated control among interlinking converters while controlling the voltage of DC distribution network. The coordination method between MG-layer and MGC-layer is also designed. Finally, time-domain simulation and experiments are carried out to validate the effectiveness of the proposed methods.