Meshed high-voltage-DC (HVDC) grids will play a significant role in future electric energy transmission. Line commutated converters as installed by default in the recent years will be replaced by voltage source converters in the future, thus enabling a rather simple multi terminal operation. To connect HVDC installations with differing nominal voltages, the development of HVDC-DC-converters is essential. In this publication, basic considerations regarding topology and control of those devices are made and a demonstrator, designed and built within the framework of the research project „GriDConv“ at Graz University of Technology, is presented. The device is designed as hybrid cascaded two-level-converter with three branches to demonstrate the principle of operation and selected control functionalities. The basic parameters are 800 V on the primary side, 500 V on the secondary side and 50 kW transfer capacity. Electromagnetic compatibility (EMC) plays an important role in the design. The efficiency of different methods for improving EMC can be tested with the demonstrator.

Translated title of the contributionInnovative HVDC-DC-converter for high-voltage DC-grids—basic considerations of topology, control and electromagnetic compatibility
Original languageGerman
Pages (from-to)497-506
Number of pages10
Journale&i - Elektrotechnik und Informationstechnik
Issue number8
Publication statusPublished - 1 Dec 2018



    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

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