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Research

The Institute of Electrical Engineering (ETI) is part of the Faculty of Electrical Engineering and Information Technology of the Karlsruhe Institute of Technology (KIT) and consists of three chairs.

Electric Drives and Power Electronics

Univ.-Prof. Dr.-Ing. Michael Braun

 

Research Topics

Electric Drives

  • Modelling of electric drives
  • Field oriented control of electrical machines
  • Control of electrical machines in terms of torque, speed, angle
  • Characterisation of motors supplied by inverters

Converter Systems

  • Novel topologies: modular multilevel converters, matrix converter
  • Regenerative energy sources: power electronics for solar and wind energy
  • Power electronics for electromobility
  • Novel power semiconductors

Projects

Ongoing and finished projects, you can find on: Projects

Hybrid Electric Vehicles

Univ.-Prof. Dr.-Ing. Martin Doppelbauer

Electric motors have been known for 150 years and they are in industrial mass production for more than 100 years. However, the requirements for motors and power electronics for the automotive industry differs significantly from conventional designs. An optimized design of an electric drive train can only be achieved in an interdisciplinary context.

Research Groups

The research fields are split into three focus areas:

Struktogramm_HEV

Power density is of great importance for motors in automotive applications. This can be achieved by higher speeds, improved cooling, lightweight designs and other measures. In addition, the use of novel SMC materials, alternative concepts with low rotor inertia and the integration of power electronics in the electric motor is researched.

 

For more information see the project data sheet..

Due to the strong innovative character of electric and hybrid vehicles, the question of the optimal drive train topology has not been answered definitively. Solutions of this problem lie in the simulation-based optimization. This requires the modeling of the entire drive train from the battery to the wheel.

 

For more information see the
project data sheet.

By coupling analytical calculations with FEM-based analysis tools, application-specific parameters and motor geometry can be optimized. Through this methodology, the overall efficiency of the engine, but also its dynamic behavior in terms of noise and vibration levels are improved.

 

For more information see the
project data sheet.

 

 

 

Construction and testing of prototypes

 

Pruefstand_HEV

For the characterization of prototypes and for parameterization and validation of simulations, three test stands are in preparation. With 145 kW and 215 kW, speeds to 18,000 rpm rev / or 15,000 rev / min and torques of 270 Nm to 540 Nm they are an ideal match of the power range of hybrid and electric vehicles. In addition to studying the dynamics of electric motors, drive cycle analyzes can be performed.

 

 

 

Projects

The following page is a compilation of some ongoing projects: Projects

 

Power Electronic Systems

Univ.-Prof. Dr.-Ing. Marc Hiller

In order to increase energy efficiency and enhance operational features, electrical drives are increasingly operated with variable speed using power electronic converters. A major driver supporting this trend is the fast development of power semiconductors with continuously enhanced performance regarding switching speed and power losses.

But also in grid applications power electronic converters play an important role. Besides converters for wind and photovoltaic applications as well as HVDC transmission, power electronics improve the operation of modern grid structures. In contrast to the existing network structure, the grid of the future will be based on decentralized power generation. This will lead to meshed grids with a large production and storage capacity directly connected not only to the low voltage grid but also to the medium voltage and high voltage grid by power electronics. Converters will have to ensure the grid stability (frequency control, voltage control, grid restoration, system and operation management) associated with the requirement of high reliability and efficiency, low harmonics and low costs. New circuit topologies and power semiconductors enable promising solutions to replace or enhance the performance of conventional systems. Therefore, power electronics together with the digitalization of the grid are key enablers to realize the so-called “Energy Transition”.

 

With new fields of application the requirements of power electronic solutions regarding power density, functionality, reliability and efficiency become more demanding. In order to get an optimal result the converter has to designed in the context of the entire power electronic system. Besides the converter itself this includes all system components (storage, cooling, electrical machines, cables, transformers, filters etc.) as well as optimized control algorithms to ensure the system friendly operation of the converter. New applications very often require completely new approaches, which can be extensively investigated with the ETI infrastructure for modelling, simulation and hardware validation of power electronic systems.

 

Competencies

  • Electrical and thermal converter design & calculation
  • Qualification of LV/MV power semiconductors
  • Topology design (power and control)
  • Control algorithms for grid and motor applications / Software development
  • Prototyping: Design, Manufacturing, Test
  • Test setup design and prototype verification

 

Projects

The following page is a compilation of some ongoing projects: Projects