September 16, 2025 – September 17, 2025
Compared to the most commonly used 2-Level converters, multilevel converters feature several voltage steps at the output. This allows using power semiconductors which do not have to be rated for the full DC link voltage and avoids series connection of switches. Furthermore, this enables higher system voltages for AC and DC applications as well as improved efficiency and reduced harmonic distortion at higher resulting switching frequencies.
In recent years, many 3- and 5-Level converter topologies have been introduced for demanding applications like photovoltaic systems, wind converters, uninterruptible power supplies, MV drives and active filters. In addition, split DC link topologies - like the MMC - are commonly used in power grids and MV applications.
All of these applications benefit from one or more of the most important advantages of multilevel converters:
+ Improved EMI behavior, less harmonics,
+ Improved efficiency,
+ Use of cost-efficient power semiconductors at lower voltage ratings,
+ Reduction of passive filters (improved power density),
+ Improved availability using redundant components,
+ Higher bandwidth.
Despite these benefits multilevel converters still suffer from some drawbacks:
- Higher parts count and higher design complexity,
- Higher costs, which are only partly compensated by the system benefits,
- Increased control effort.
The training conveys important competencies allowing the professional design, rating and implementation of multilevel/multicell converter-based systems. The tutorial is designed for R&D engineers, system designers, project managers and (PhD) students interested in power electronic converters and systems, especially for grid and drive applications.