05. - 07.06.2018
PCIM Europe 2018
Power Electronics | Intelligent Motion | Renewable Energy | Energy Management


Tutorial 2

Design of Multilevel Converter Systems


Monday, 04.06.2018, 09:00 - 17:00 hrs


Arvena Park Hotel Nuremberg, Görlitzer Str. 51, 90473 Nuremberg


09:00 Design of Multilevel Converter Systems
Prof. Dr.-Ing. Marc Hiller, Karlsruhe Institute of Technology (KIT), Karlsruhe, Deutschland
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 are commonly used in power grids (HVDC, SVC) 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 tutorial delivers important competencies allowing the professional design, rating and implementation of multilevel converter based systems. The main focus is put on 3- and 5-Level topologies but higher level concepts will also be explained.
In order to give a system-oriented design overview the following topics will be covered:
- Overview on multilevel topologies
- Introduction to their basic functionality
- 3- and 5-Level converters
- Modular multilevel converters (MMC)
- Design aspects and features of multilevel converters:
- Component design
- Semiconductor losses and modulation
- Voltage balancing
- Fault management, redundancy, filter design
- Application examples

Who should attend?
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.


Speaker detail

Herr Marc Hiller
Prof. Dr.-Ing. Marc Hiller
Karlsruhe Institute of Technology (KIT), Karlsruhe, Deutschland
Prof. Hiller received his diploma in Electrical Engineering from the Technical University Darmstadt in 1998. After one year as R&D engineer for traction converters at the Siemens AG, Erlangen, he joined the University of Federal Armed Forces in Munich, Germany, in 1999. After receiving his PhD degree he worked for 11 years in the R&D department for industrial LV & MV converters at the Siemens AG, Nuremberg, where he was involved in various projects on Multilevel Converters for industrial drives. As project manager and group leader he introduced the first Medium Voltage Modular Multilevel Converter for drive and grid applications to the market. In 2015, he joined the Karlsruhe Institute of Technology where
he holds a chair for Power Electronic Systems at the Institute of Electrical Engineering (ETI).