In this paper, a compartmentalization strategy is proposed for the economic operation of a hybrid AC/DC microgrid. The hybrid AC/DC microgrid will be compartmentalized into several independently controlled and coordinated AC and DC nanogrids. Accordingly, the optimal economic operation of the microgrid consists of two segments, including the optimal power sharing among local DERs in individual nanogrids and the optimal power sharing among interconnected nanogrids. For each AC/DC nanogrid, the optimal power sharing and frequency/voltage restoration are realized simultaneously without the need for any real-time communication. In the compartmentalized microgrid, each nanogrid will communicate with neighboring nanogrids through a sparse communication network to regulate power exchanges among nanogrids. In islanded mode, incremental costs of nanogrids are unified for realizing the optimal economic operation of the microgrid. In grid-connected mode, the external electricity price (i.e., purchase/sale electricity price set by the utility grid) is the desired incremental cost, which would be imposed on some pinned nanogrids and propagated among the remaining nanogrids. Then, the optimal power sharing of nanogrids within the grid-connected microgrid would be modeled as a pinning synchronization problem. The proposed compartmentalization strategy ensures that the optimal economic operation of the hybrid AC/DC microgrid is achieved under both island and grid-connected modes while the utilized communication structure is simplified and the dependency on communication networks is reduced. The performance of the proposed compartmentalization strategy is tested and verified through time-domain simulations in PSCAD/EMTDC for a hybrid AC/DC microgrid located at Illinois Institute of Technology (IIT).

中文翻译：

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交直流混合微电网优化经济运行的分区策略

在本文中，针对混合 AC/DC 微电网的经济运行提出了分区策略。混合交流/直流微电网将划分为几个独立控制和协调的交流和直流纳米电网。因此，微电网的最优经济运行由两部分组成，包括单个纳米电网中本地分布式能源之间的最优功率分配和互连纳米电网之间的最优功率分配。对于每个 AC/DC 纳米电网，无需任何实时通信即可同时实现最佳功率共享和频率/电压恢复。在分区微电网中，每个纳米电网将通过稀疏通信网络与相邻的纳米电网进行通信，以调节纳米电网之间的电力交换。在孤岛模式下，统一纳米电网增量成本，实现微电网优化经济运行。在并网模式下，外部电价（即公用电网设定的购买/销售电价）是所需的增量成本，该成本将被施加在一些固定的纳米电网上并在剩余的纳米电网之间传播。然后，并网微电网内纳米电网的最佳功率共享将被建模为钉扎同步问题。所提出的分区策略确保在孤岛和并网模式下实现混合AC / DC微电网的最佳经济运行，同时简化所使用的通信结构并减少对通信网络的依赖。