Bidirectional Bipolar Electronic Overcurrent Safety Elements for Bipolar DC Grids

Konferenz: PCIM Europe 2019 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
07.05.2019 - 09.05.2019 in Nürnberg, Deutschland

Tagungsband: PCIM Europe 2019

Seiten: 10Sprache: EnglischTyp: PDF

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Schulz, Matthias; Kaiser, Julian; Gosses, Kilian (Fraunhofer Institute for Integrated Systems and Device Technology IISB, Germany)
Conz, Rafael; Maerz, Martin (Chair of Energy Electronics, Friedrich-Alexander University Erlangen-Nuremberg, Germany)

DC grids verifiably have the potential to be a strong partner of conventional AC grids, but safety elements for DC are few. Based on the analysis of different fault scenarios, the requirements for overcurrent safety elements for a bipolar DC microgrid in a TN and an IT structure are derived. First, a safety device for SELV DC buses is developed using JFETs as the main switches. Second, a self-powered, autonomous, and bidirectional approach for main buses is supplied by an energy-harvesting step-up converter and a micro-controller controls MOSFETs. Each section concludes with prototypes and their associated experimental results.