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This paper presents a power-based droop controller for distributed energy resources converters in dc microgrids that are connected to the utility ac grid by a grid-interface converter. Typically, when dc microgrids are interfaced to ac power systems, the microgrid dc bus voltage can be affected by fluctuations caused, for example, by background harmonics present in the ac systems or by fluctuating...
This paper introduces a power-based droop controller for parallel operation of distributed energy resources in dc microgrids. This controller achieves power flow control when the bus voltage is imposed by a grid-interface converter that links the microgrid to an upstream grid. In such a case, accurate load distribution is allowed regardless of cable impedances. On the other hand, the proposed controller...
This paper proposes a unified power-based droop control method for distributed energy resources in dc microgrids that can operate both in grid-connected and islanded mode. When the main grid is available, the bus voltage is regulated by the grid-interface ac/dc converter, while distributed energy resources operate as power controlled sources. During abnormal operation of the main grid (e.g., due to...
This paper presents the application of an online stability monitoring technique (MT) for droop controlled power converters in DC microgrids. This method is based on Middlebrook's loop-gain measurement technique, adapted to digitally controlled switched-mode power supplies (SMPS). In particular, the MT is used to evaluate the stability margin in control loops of droop-controlled distributed energy...
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