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Research Topics

Mechatronic Drive Systems

The requirements placed on modern drive systems can no longer be met by conventional electric motors with or without gear unit. Therefore more intelligent solutions specially designed for drive applications are needed, the so-called mechatronic drive systems. In this context, research is carried out in the following areas:

  • Development and optimization of mecha-tronic drive systems
  • Load spectrum minimization in mechatronic energy conversion drive systems
  • Enhancement of durability using control-engineering methods
  • Optimization of drive systems energized by DC or 16.7 Hz AC voltage
  • Concepts and circuit topologies and design of electronic power regulator control elements for active damping in drive systems.
  • Stator flux oriented control with high dynamic torque control especially in field weakening operation
  • Parameter estimation for induction and PM -synchronous machines and converters
  • Engine speed identification procedures for encoderless induction machine operation
  • Double three-level-machine inverter for low torque ripple

Renewable Energy Sources

Due to the stochastic fluctuation of wind speeds, the technical utilization of wind energy faces two important problems. Firstly, the increased amount of wind power added to existing power supply systems as a result of the integration of wind parks, leads to some side-effects e.g. voltage fluctuations, caused by the fluctuating instantaneous power generated by wind farms. Secondly, the fluctuation of wind speeds also causes high power oscillations in the drive-train of the wind energy converter.

  • Project planning and design
  • Control methods for energy converters (MPP-Tracking,...)
  • Wind and solar park management
  • Reduction of grid perturbations
  • Variable-speed high power generator systems for wind energy converters
  • Control methods for the operation of wind energy converters during grid faults (Fault-Ride Through)

Decentralized Energy Supply Systems

The maximum proportion of renewable energy in power grids is limited by the stochastic fluctuations associated with renewable energy sources due to technical and economical reasons. From a technical point of view, the fluctuating energy supply reduces the power quality, where the problems are more pronounced in weak and isolated networks, rather than in the European electrical grid.

  • Structures and dynamic behaviour of decentralized energy supply systems and distribution grids - „Virtual Power Plants“
  • Energy flow- and load management
  • Dynamic storage systems
  • Energy conditioning

Energysupply For Transportation Systems

With the development of modern transportation systems, the power efficiency challenge is of increasing importance. This can be improved significantly through the use of storage systems, in which the braking energy is absorbed and stored temporarily. With the use of such a buffer storage, there is also a variety of new functions/settings such as the operation of high-performance electronic devices, with specific thermal loads or the issue of adequate energy management for storage.


With the desirable use of alternative energy sources for individual transportation, new challenges arise regarding the drive-trains of passenger vehicles. Therefore research interests include the design of drive-trains, increasing the charging capacity and efficiency, as well as the following topics:

  • Drive system and energy management
  • Efficiency analysis of overall systems and sub-systems
  • Battery management systems for various battery technologies
  • Fast charging infrastructure (AC/DC) including „Vehicle to Grid“ support