Abstract
Many office applications are low power such as computers, monitors, laptops, phones and even LED lighting. Powering them from a 48 volt DC grid is sufficient and has one great advantage. Namely, the 48volt is safe regarding touching. However, protection to prevent excessive short circuit currents has to be provided. In this paper we discuss a 48 volt DC grid that is implemented as a living lab. In the living lab, droop control and short circuit protection are implemented. The 48 volt DC grid is connected to a 350-400 volt DC grid via a bidirectional DCDC converter. The 350-400 volt DC grid is used for powering higher power levels such as air conditioning, battery storage, photovoltaic or an AC grid-tied inverter for power exchange. The theory behind and implementation of droop control, via a hybrid analog/digital controller is discussed along with measurements. Predictive short-circuit protection is discussed to prevent excessive short circuit currents. Earth leakage detection via monitoring is discussed as well as its advantage for DC grids. Droop control and protection are combined in a Grid Manager that regulates each load individually.
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