Soliman, Hammam Abdelaal Hammam

Project title: Condition Monitoring of Capacitors for DC-link Application in Power Electronic Converters

PhD period: 2014.01.01 – 2016.12.31. (has been prolonged till 2017.05.20.)
Section: Power Electronic Systems
Research Programme: Efficient and Reliable Power Electronics & Wind Power Systems
Supervisor: Frede Blaabjerg
Co-Supervisor: Huai Wang
Contact information


Collaborators: Vestas Wind Systems A/S, Grundfos A/S, Danfoss A/S and kk-electronic a/s.
Funding: Electrical and Control Department, Arab Academy for Science, Technoogy, and Maritime Transport, Egypt & The Department of Energy Technology, AAU.


Hypothesis: The degradation of capacitors can be analyzed by monitoring their electrical parameters such as equivalent series resistances, capacitances and leakage currents.

Description: Capacitors for dc-link application are one of the most important components in most of the power electronic converters in terms of the reliability, physical size and cost. The reliability of the capacitors under operation is influenced by stressors like temperature, voltage and humidity. The project will develop new methods to monitor the change of the electrical parameters of electrolytic capacitors and emerging type of capacitors (film capacitors and ceramic capacitors) for dc-link application under stressed conditions. The application of the methods is twofold: condition monitoring during the accelerated lifetime testing of capacitors to achieve more accurate and useful data for degradation analysis and lifetime modelling; condition monitoring of capacitors under operation in power electronic converters to validate the designed in reliability and provide online degradation information for proactive maintenances.

Expected Results: New condition monitoring methods for capacitors for dc-link application which are useful for both accelerated lifetime testing and under field operation.


Publications in journals and conference papers may be found at VBN.