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A dc-based low-voltage power supply offers many advantages over the historically grown ac voltage infrastructure. The paper shows the potentials for cost reduction, efficiency enhancement and equipment miniaturization through new cognitive power electronics, but also discusses the obstacles to a faster market penetration of dc microgrids. These include aspects of grid control, grid stability, security...
DC microgrids can offer many advantages for an installation in commercial applications like data centers or in private homes. In this paper, future expansion of such grids towards a bipolar architecture (e.g. ±380 VDC) is evaluated. The focus lies on various fault situations, their effects on the grid and possible solutions to maintain grid safety. For this purpose, a laboratory scale bipolar test...
The extension of a segregated DC microgrid with different voltage levels to a fully bidirectional grid is surveyed in this paper. The approach offers efficient implementation of small sources of regenerative energies and distributed energy storage systems as well as the possibility to even include electric vehicles as sources with high capacity. Furthermore, energy stored in any part of the grid,...
DC microgrids have become widely adapted in recent years, with 380 V being the most common voltage choice in applications like data centers and central offices around the world. For future developments with an increasing power demand, adding a second line conductor to a DC microgrid can provide means to increase overall energy efficiency. This paper evaluates fault situations in such a bipolar ±380...
380 VDC distribution grids have reached maturity for the power supply of data centers and central offices over recent years. New developments in this field are tending towards integrating more distributed energy resources like photovoltaics and wind turbines. Also, high-capacity battery storage systems based on lithium-ion cells are on the rise to increase self-reliance and reduce operating cost....
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