Combining Earth-Leakage and Short-Circuit Protection in DC Grids

Conference: PCIM Conference 2025 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/06/2025 - 05/08/2025 at Nürnberg, Germany

doi:10.30420/566541321

Proceedings: PCIM Conference 2025

Pages: Language: englishTyp: PDF

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Authors:
Boendermaker, Fedor; de Bruin, Koen; Zuidervliet, D.C.; van Duijsen, P.J.

Abstract:
In an AC grid, earth-leakage and over-current protection is realized by electromechanical devices. In a DC grid, electronic protection is to be applied, because of arcing in mechanical separators. The power flow in a DC grid is regulated using power electronic converters. The combination of the electronic protection and the converters used in a DC grid, reduces the overall component count in a DC grid. Furthermore, the power electronic converters in a DC grid, need electronic protection as well. In this paper the location of the electronic protection in a DC grid and the combination of the electronic protection and the converters is elaborated. The combination of earth-leakage, arc, over-current and short-circuit protection, as well as inrush methods, into the Interlink and Grid Manager power electronic converters is detailed in this paper. A typical design of an Flux-gate for earth-leakage detection and experimental results on short-circuit detection are given in the paper.