Abstract
The advent of the Modular Multilevel Converter technology allows building multi-terminal high-voltage DC grids. In order to interconnect DC grids with different voltage levels, highly efficient and compact high-voltage DC-DC (HVDC) converters are required. This paper presents the control and design of a transformerless high-voltage DC-DC converter, which has been designed and built within the framework of the research project GriDConv at the Graz University of Technology. The converter basically consists of high-voltage half-bridges in combination with a series of submodules with full-bridge technology. A dedicated control strategy for the converter is developed, which allows advantageous soft switching of the high-voltage half-bridges, which considerably reduces switching losses of the half-bridges. In addition, a balancing strategy for the individual cell voltages as well as a control of total cell voltage are presented. The developed control strategies are discussed in detail and, in the end, verified through experiments on a constructed 50 kW lab-scale hardware demonstrator.
| Translated title of the contribution | GriDConv – Regelung, Design und experimentelle Verifikation eines Hochspannungs-DC-DC-Wandlers im Labormaßstab |
|---|---|
| Original language | English |
| Pages (from-to) | 45-56 |
| Number of pages | 12 |
| Journal | Elektrotechnik und Informationstechnik |
| Volume | 140 |
| Issue number | 1 |
| Early online date | 23 Jan 2023 |
| DOIs | |
| Publication status | Published - Feb 2023 |
Keywords
- High-voltage direct current system
- HVDC
- Power Electronics
- DC-DC converter
- Multilevel Converter
- Converter Control
Fields of Expertise
- Sustainable Systems