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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...
Sinusoidal charging can boost the power density of GaN-based battery charger with the penalty of dropped efficiency due to hard-switching. In this paper, different AC charging waveforms are investigated to achieve better charger efficiency with slightly increased DC link capacitance. It turns out that PWM-zero-off charging, which shut down DC/DC stage at zero part of the charging current waveform,...
Efficiency has become a key design parameter when designing any electrical system. In recent years, significant attention has been paid to the design of optimized micro and nanogrids comprising residential area subsystems. Among the different proposed approaches, one of the most promising consists of a dc-based nanogrid optimized for the interoperation of electric loads, sources, and storage elements...
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