Chair of Power Electronics

Overview

Our research is focused on the design of high efficient and reliable PWM-based power converter architectures (single-cell, multi-cell, multilevel), their modelling and control to exploit commercial as well as new power semiconductor devices with minimum over design.
We develop controllers for electric drives and we are particularly skilled in the integration of renewable energy systems into the electric grid.
Please discover our expertise looking to our recent projects.

Research Projects

The Highly Efficient And Reliable smart Transformer (HEART), a new Heart for the Electric Distribution System

The project will run at Kiel Universityfor 5 years involving 5 PhDs and Post-Docs as well as many guest researchers and professors. It will be a flagship research for the Chair of Power Electronics. The project will be developed in a newly established high-voltage and high-power laboratory with facilities for reliability testing, efficiency and thermal verification of power converters. [read more]

Interreg 5a: Leistungselektronik Region (PE:Region)

The PE:Region project targets a leading role for the German-Danish cross-border region in development and production of innovative power electronics components and systems. This implies robust, reliable and energy efficient products to growing markets where regional companies in particular have a strong position in the value chains of renewable energy, variable speed drives, control and regulation of electric energy, and green mobility. [read more]

LIFEtime-enhanced Components for WIND Turbines (LIFE-WIND)

The Power Electronic System (PES) is an important part of Wind Turbine Systems (WTS) and according to the statistics the most prone to failure. Power converter systems contain numerous components such as semiconduc-tors, drivers, and passive components and are subject to many different mission profiles (applied loads and stresses). Due to the employed manufacturing process and aging, the parameters of the components vary, which has an impact on both the performance and the reliability of the PES. Thus, a robust design is essential to minimize the failure rate of the PES and preserve its performance. [read more]

Investigation of reliability issues in power electronics

In a first step, components used in power electronics systems in different applications will be identified and classified according to pre-determined groups. Their functional role on the system will also be presented, in order to asses possible failure conditions.
In a second step, a qualitative investigation will take place to identify critical components. For such purpose, questionnaires and interviews will be performed in cooperation with ECPE partner companies to trace common sources for failures in the field. Not only the formulation but also evaluation of the results will be performed in close cooperation with the University of Kassel.
In the last step, a report will be prepared, containing a component ranking. It will also present the identification of possible future research targets to materialize a reliability roadmap at system level. This report will be written together with the University of Kassel in order to cover all results from the joint investigations. [read more]

Active thermal control of power semiconductor modules

The aim of this project is to increase reliability and lifetime of power semiconductor modules in power converters using active thermal control, without affecting the system performance. The first milestone is the design of an online junction temperature estimation on the basis of temperature sensitive electrical parameters (TSEP). The second milestone is to introduce an aging model to monitor the impact of temperature fluctuations on the module’s lifetime. In the end the model predictive control is used to include thermal and aging information to the control law and set the op-timal switching operation that fulfils the applications demand, reduces the thermal stress in a specific semiconductor and limit the additional losses. [read more]

Wind Farm Control Strategies to Increase the Wind Energy Penetration with Low Effects on the Electric Grid

In the recent years the structure of electrical grid has changed. Many Distributed Generation units are connected to distribution grid. As a higher share of DGs should be integrated with the grid, technical problems arise in different areas such as power quality, voltage stability, harmonics, reliability, protection and control.

The main goal of this project is to facilitate the grid integration of wind energy by addressing the control issues. [read more]

Analysis of the electrical characteristics of medium-voltage grids regarding the optimization during high energy input from wind energy systems

(Analyse der elektrischen Eigenschaften von Mittelspannungsnetzen in Hinsicht auf eine Optimierung bei hoher Einspeisung aus Windenergieanlagen)

The aim of the project is to accurately analyze the behavior of medium-voltage grid. A measurement system by using parallel inverters will be designed and implemented to analyze grid impedance and also harmonics. The grid impedance at certain frequency is based on the injection of non-characteristic harmonic current and the extraction of resultant voltage harmonic. Additionally, the system can function as reactive power supply and active power filter. [read more]

Kopernikus-Projekt „Neue Netzstrukturen“: Neue EnergieNetzStruktURen für die Energiewende (ENSURE)

The Kopernikus-project ENSURE targets the investigation and provision of new energy grid structures for the Energiewende with a holistical, systemic approach. It is devided in three focus areas: analysis of new system structures, stable system management and integration of new technologies into the energy supply system. Another point of focus lies in the subsequent realization and proving of the holistical energy supply system in the form of an industrial-scale grid demonstrator.

The whole project is funded by the Federal Ministry of Education and Research with a sum of 40 million Euro. 600.000 Euro are provided for the CAU.  
[read more]

RELINK - Power Electronic Converter for connection of Decentralized AC- and DC-Systems

The project RELINK goal is the development, design, and implementation of an intelligent power electronics based system, which shall improve the operation and flexibility of the regional and national grid. [read more]

DFG - Formal stability assessment of hybrid distribution grids based on the correct modeling of the effect of synchronization of the power electronics interfaces

The project is to propose a stability assessment aimed at modeling and quantifying the driving phenomena of microgrid control instability. To achieve this goal, we propose to study six main elements. For each one we expect to have a dedicated task of the project. [read more]

Research

  • Our research is focused on the design of high efficient and reliable PWM-based power converter architectures (single-cell, multi-cell, multilevel), their modelling and control to exploit commercial as well as new power semiconductor devices with minimum over design.
    We develop controllers for electric drives and we are particularly skilled in the integration of renewable energy systems into the electric grid.
    Please discover our expertise looking to our recent projects.

    HEART - The Highly Efficient And Reliable smart Transformer
    Further Research Projects

Location