This article proposes a control strategy for integrated dc microgrids (MGs) into power systems. In this method, the DC MGs are capable of importing or exporting energy from or to the AC grid based on the loading conditions. The DC MGs employ an interlinking converter (IC) as a bidirectional back-to-back converter for a distributed generator (DG) unit at the point of common coupling (PCC). In a multi-DG unit DC MG, an energy management strategy should be planned by sharing network loads among dispatchable DG units, and meanwhile, the dc network voltage should be regulated. The proposed control system utilizes an ac voltage superimposed on the nominal dc voltage of the network. The frequency of the superimposed ac voltage is used to modify the conventional droop control, which leads to simultaneous accurate load sharing and regulated voltage in a decentralized manner. The IC DG unit equipped with the proposed controller interfaces the dc network through a dc/dc buck converter and the ac grid through an active rectifier. This strategy provides a seamless transition between islanded and grid-connected modes for the DC MGs. The performance of the proposed control system is evaluated through simulations studies via PLECS and a set of experimental results.

中文翻译：

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将直流微电网集成到交流电源系统中的分散式电压调节和能量管理

本文提出了一种将直流微电网（MGs）集成到电力系统中的控制策略。在这种方法中，DC MG能够根据负载条件从AC电网导入能量或向AC电网导入能量。DC MG在公共耦合点（PCC）处使用一个互连转换器（IC）作为分布式发电机（DG）单元的双向背对背转换器。在多DG机组DC MG中，应通过在可调度DG机组之间分担网络负载来规划能源管理策略，同时应调节直流电网电压。所提出的控制系统利用交流电压叠加在网络的标称直流电压上。叠加交流电压的频率用于修改常规的下垂控制，这样就可以同时实现精确的负载分担和分散的稳压。配有建议的控制器的IC DG单元通过dc / dc降压转换器与直流网络接口，并通过有源整流器与ac电网接口。该策略为DC MG提供了孤岛模式和并网模式之间的无缝过渡。通过PLECS进行的模拟研究和一组实验结果对所提出的控制系统的性能进行了评估。