Basic Considerations for Operation and Protection of Modular Grids with Grounding Transformer

Conference: PESS 2020 - IEEE Power and Energy Student Summit
10/05/2020 - 10/07/2020 at online

Proceedings: PESS 2020 – IEEE Power and Energy Student Summit

Pages: 6Language: englishTyp: PDF

Franke, Martin; Schegner, Peter (Technische Universität Dresden, Germany)
Palm, Sebastian (ENSO NETZ GmbH, Dresden, Germany)

The project FlexNet-EkO aims to implement a modular grid, a power-electronically decoupled part of the distribution grid, at low voltage level. Decoupling is realized by a so-called power electronic grid interconnector. This paper describes the use of a grounding transformer to supply single-phase currents and its influence on grid operation and protection. The impact of dq reference frame current limitation in combination with a grounding transformer on single-phase currents is investigated. Compliance of fuse tripping times with DIN VDE 0100-410 is investigated as a function of the grid interconnector’s rated power.