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Prof. Marco Liserre,
Christian-Albrecht University of Kiel, Germany, IEEE Fellow.

Marco Liserre is currently Full Professor and he holds the Chair of Power Electronics at Christian-Albrecht University of Kiel (Germany). He has published over 280 technical papers (more than 75 of them in international peer-reviewed journals), 4 chapters of a book and a book. These works have received more than 17000 citations. Marco Liserre is listed in ISI Thomson report “The world’s most influential scientific minds” from 2014.
He has been awarded with an ERC Consolidator Grant for the project “The Highly Efficient and Reliable smart Transformer (HEART), a new Heart for the Electric Distribution System”. He has got several IEEE awards.


Reliability Enhancement of Modular Power Converters by Uneven Loading of Cells

Abstract:

Several medium to high power converters for renewable and smart grid applications are based on modular power converters. Previous studies based on field data about failures in wind and photovoltaic systems showed that power modules and capacitors are the components most prone to failure. Different components are subjected to different failure mechanisms that, in some cases, depend on the processed power. It is reasonable that once one cell of a modular architecture fails, independently of the failed component, the cell is sent to maintenance and replaced. The same cell is repaired and becomes available again from the stock of replacement units. This means that a modular converter is, by nature, a system made by differently aged cells. This presentation clarifies the concept of power routing in a modular power converter to implement active thermal control through unevenly loading the cells of the modular architecture. The aim is to avoid—or delay as much as possible—the failures dependent on the cell’s processed power, shifting the load from the cells, whose components are older. The presentation will show the first results achieved for different kinds of modular converters.